[v6,3/3] media: i2c: isl7998x: Add driver for Intersil ISL7998x

Commit Message

Michael Tretter Oct. 14, 2021, 1:31 p.m. UTC

From: Marek Vasut <[e-mail]>

Add driver for the Intersil ISL7998x Analog to MIPI CSI-2/BT656 decoder.
This chip supports 1/2/4 analog video inputs and converts them into
1/2/4 VCs in MIPI CSI2 stream.

This driver currently supports ISL79987 and both 720x480 and 720x576
resolutions, however as per specification, all inputs must use the
same resolution and standard. The only supported pixel format is now
YUYV/YUV422. The chip should support RGB565 on the CSI2 as well, but
this is currently unsupported.

Signed-off-by: Marek Vasut <[e-mail]>
Cc: Sakari Ailus <[e-mail]>
Cc: Mauro Carvalho Chehab <[e-mail]>
Cc: Rob Herring <[e-mail]>
To: [e-mail]
Signed-off-by: Michael Tretter <[e-mail]>
---
Changelog:

v6:

- remove unused log2.h
- add select MEDIA_CONTROLLER
- use poll_read_timeout to wait for power on
- add timeout to polling for video standard
- use fwnode_graph_get_endpoint_by_id
- fix invalid bus type error message

v5: none

v4:

- fix lines over 80 chars where applicable
- fix possible NULL pointer access in link_freq
- initialize bus type with CSI2_DPHY
- iterate over pads instead of hard coded 4
- merge power_{on,off} functions into resume,suspend
- switch to v4l2_subdev_state
- report field order based on video standard
- add error message for timeout
- simplify dev_dbg statement in update_std
- call v4l2_ctrl_handler_setup
- don't set control if pm_runtime is not enabled
- fix YUV422 byte order
- switch to pre_streamon callback for LP11 mode

v3:

- follow dt binding change: pd-gpios -> powerdown-gpios

v2:

- general cleanup
- remove isl7998x_g_mbus_config function
- implement enum_frame_size function
- replace msleep with usleep_range
- rework set_fmt/get_fmt functions
- calculate number of inputs using number of input ports
- switch to runtime_pm
- add reset gpio
- add adv_debug support
- add MAINTAINERS entry
---
 MAINTAINERS                  |    8 +
 drivers/media/i2c/Kconfig    |   10 +
 drivers/media/i2c/Makefile   |    1 +
 drivers/media/i2c/isl7998x.c | 1394 ++++++++++++++++++++++++++++++++++
 4 files changed, 1413 insertions(+)
 create mode 100644 drivers/media/i2c/isl7998x.c

Comments

Hans Verkuil Oct. 18, 2021, 1:57 p.m. UTC | #1

Hi Michael,

Ah, I thought this was a camera sensor, but it is a video receiver. That's not
the same as a camera sensor, and video receivers use a different API:
VIDIOC_S/G_STD, VIDIOC_ENUMSTD and VIDIOC_QUERYSTD (or in this case the SUBDEV
variants of these ioctls). See for more details below:

On 14/10/2021 15:31, Michael Tretter wrote:
> From: Marek Vasut <[e-mail]>
> 
> Add driver for the Intersil ISL7998x Analog to MIPI CSI-2/BT656 decoder.
> This chip supports 1/2/4 analog video inputs and converts them into
> 1/2/4 VCs in MIPI CSI2 stream.
> 
> This driver currently supports ISL79987 and both 720x480 and 720x576
> resolutions, however as per specification, all inputs must use the
> same resolution and standard. The only supported pixel format is now
> YUYV/YUV422. The chip should support RGB565 on the CSI2 as well, but
> this is currently unsupported.
> 
> Signed-off-by: Marek Vasut <[e-mail]>
> Cc: Sakari Ailus <[e-mail]>
> Cc: Mauro Carvalho Chehab <[e-mail]>
> Cc: Rob Herring <[e-mail]>
> To: [e-mail]
> Signed-off-by: Michael Tretter <[e-mail]>
> ---
> Changelog:
> 
> v6:
> 
> - remove unused log2.h
> - add select MEDIA_CONTROLLER
> - use poll_read_timeout to wait for power on
> - add timeout to polling for video standard
> - use fwnode_graph_get_endpoint_by_id
> - fix invalid bus type error message
> 
> v5: none
> 
> v4:
> 
> - fix lines over 80 chars where applicable
> - fix possible NULL pointer access in link_freq
> - initialize bus type with CSI2_DPHY
> - iterate over pads instead of hard coded 4
> - merge power_{on,off} functions into resume,suspend
> - switch to v4l2_subdev_state
> - report field order based on video standard
> - add error message for timeout
> - simplify dev_dbg statement in update_std
> - call v4l2_ctrl_handler_setup
> - don't set control if pm_runtime is not enabled
> - fix YUV422 byte order
> - switch to pre_streamon callback for LP11 mode
> 
> v3:
> 
> - follow dt binding change: pd-gpios -> powerdown-gpios
> 
> v2:
> 
> - general cleanup
> - remove isl7998x_g_mbus_config function
> - implement enum_frame_size function
> - replace msleep with usleep_range
> - rework set_fmt/get_fmt functions
> - calculate number of inputs using number of input ports
> - switch to runtime_pm
> - add reset gpio
> - add adv_debug support
> - add MAINTAINERS entry
> ---
>  MAINTAINERS                  |    8 +
>  drivers/media/i2c/Kconfig    |   10 +
>  drivers/media/i2c/Makefile   |    1 +
>  drivers/media/i2c/isl7998x.c | 1394 ++++++++++++++++++++++++++++++++++
>  4 files changed, 1413 insertions(+)
>  create mode 100644 drivers/media/i2c/isl7998x.c
> 

<snip>

> diff --git a/drivers/media/i2c/isl7998x.c b/drivers/media/i2c/isl7998x.c
> new file mode 100644
> index 000000000000..130e0b33b38a
> --- /dev/null
> +++ b/drivers/media/i2c/isl7998x.c
> @@ -0,0 +1,1394 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Intersil ISL7998x analog to MIPI CSI-2 or BT.656 decoder driver.
> + *
> + * Copyright (C) 2018-2019 Marek Vasut <[e-mail]>
> + * Copyright (C) 2021 Michael Tretter <[e-mail]>
> + */
> +
> +#include <linux/bitfield.h>
> +#include <linux/delay.h>
> +#include <linux/gpio.h>
> +#include <linux/i2c.h>
> +#include <linux/module.h>
> +#include <linux/of_graph.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/regmap.h>
> +#include <linux/slab.h>
> +#include <linux/v4l2-mediabus.h>
> +#include <linux/videodev2.h>
> +
> +#include <media/v4l2-async.h>
> +#include <media/v4l2-common.h>
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-fwnode.h>
> +
> +#define V4L2_CID_TEST_PATTERN_COLOR	(V4L2_CID_USER_BASE | 0x1001)
> +#define V4L2_CID_TEST_PATTERN_CHANNELS	(V4L2_CID_USER_BASE | 0x1002)
> +#define V4L2_CID_TEST_PATTERN_BARS	(V4L2_CID_USER_BASE | 0x1003)

You must create a driver-specific range in v4l2-controls.h for these.
See e.g. V4L2_CID_USER_CODA_BASE for how to do that.

<snip>

> +
> +enum isl7998x_pads {
> +	ISL7998x_PAD_OUT,
> +	ISL7998x_PAD_VIN1,
> +	ISL7998x_PAD_VIN2,
> +	ISL7998x_PAD_VIN3,
> +	ISL7998x_PAD_VIN4,
> +	ISL7998x_NUM_PADS
> +};
> +
> +struct isl7998x_datafmt {
> +	u32			code;
> +	enum v4l2_colorspace	colorspace;
> +};
> +
> +static const struct isl7998x_datafmt isl7998x_colour_fmts[] = {
> +	{ MEDIA_BUS_FMT_UYVY8_2X8, V4L2_COLORSPACE_SRGB },
> +};
> +
> +/* Menu items for LINK_FREQ V4L2 control */
> +static const s64 link_freq_menu_items[] = {
> +	/* 1 channel, 1 lane or 2 channels, 2 lanes */
> +	108000000,
> +	/* 2 channels, 1 lane or 4 channels, 2 lanes */
> +	216000000,
> +	/* 4 channels, 1 lane */
> +	432000000,
> +};
> +
> +/* Menu items for TEST_PATTERN V4L2 control */
> +static const char * const isl7998x_test_pattern_menu[] = {
> +	"Disabled",
> +	"PAL (720x576)",
> +	"NTSC (720x480)",
> +};

Which test pattern should be used depends on the selected standard
(VIDIOC_S_STD). So this menu can just be "Disabled" and "Enabled"
and let the driver pick the PAL or NTSC version depending on the
standard.

> +
> +static const char * const isl7998x_test_pattern_bars[] = {
> +	"bbbbwb", "bbbwwb", "bbwbwb", "bbwwwb",
> +};
> +
> +static const char * const isl7998x_test_pattern_colors[] = {
> +	"Yellow", "Blue", "Green", "Pink",
> +};
> +
> +struct isl7998x_mode {
> +	unsigned int width;
> +	unsigned int height;
> +	enum v4l2_field field;
> +};
> +
> +static const struct isl7998x_mode supported_modes[] = {
> +	{
> +		.width = 720,
> +		.height = 576,
> +		.field = V4L2_FIELD_SEQ_TB,
> +	},
> +	{
> +		.width = 720,
> +		.height = 480,
> +		.field = V4L2_FIELD_SEQ_BT,
> +	},
> +};
> +
> +struct isl7998x {
> +	struct v4l2_subdev		subdev;
> +	struct regmap			*regmap;
> +	struct gpio_desc		*pd_gpio;
> +	struct gpio_desc		*rstb_gpio;
> +	unsigned int			nr_mipi_lanes;
> +	u32				nr_inputs;
> +
> +	const struct isl7998x_mode	*mode;
> +	const struct isl7998x_datafmt	*fmt;
> +	struct media_pad		pads[ISL7998x_NUM_PADS];
> +
> +	struct v4l2_ctrl_handler	ctrl_handler;
> +	/* protect ctrl_handler */
> +	struct mutex			ctrl_mutex;
> +
> +	/* V4L2 Controls */
> +	struct v4l2_ctrl		*link_freq;
> +	u8				test_pattern;
> +	u8				test_pattern_bars;
> +	u8				test_pattern_chans;
> +	u8				test_pattern_color;
> +};
> +
> +static struct isl7998x *sd_to_isl7998x(struct v4l2_subdev *sd)
> +{
> +	return container_of(sd, struct isl7998x, subdev);
> +}
> +
> +static struct isl7998x *i2c_to_isl7998x(const struct i2c_client *client)
> +{
> +	return sd_to_isl7998x(i2c_get_clientdata(client));
> +}
> +
> +static const struct isl7998x_mode *isl7998x_get_mode(struct isl7998x *isl7998x)
> +{
> +	switch (isl7998x->test_pattern) {
> +	case 1:
> +		return &supported_modes[0];
> +	case 2:
> +		return &supported_modes[1];
> +	default:
> +		return isl7998x->mode;
> +	}
> +}
> +
> +static int isl7998x_get_nr_inputs(struct device_node *of_node)
> +{
> +	struct device_node *port;
> +	unsigned int inputs = 0;
> +	unsigned int i;
> +
> +	if (of_graph_get_endpoint_count(of_node) > ISL7998x_NUM_PADS)
> +		return -EINVAL;
> +
> +	/*
> +	 * The driver does not provide means to remap the input ports. It
> +	 * always configures input ports to start from VID1. Ensure that the
> +	 * device tree is correct.
> +	 */
> +	for (i = ISL7998x_PAD_VIN1; i < ISL7998x_PAD_VIN4; i++) {
> +		port = of_graph_get_port_by_id(of_node, i);
> +		if (!port)
> +			continue;
> +
> +		inputs |= BIT(i);
> +		of_node_put(port);
> +	}
> +
> +	switch (inputs) {
> +	case BIT(ISL7998x_PAD_VIN1):
> +		return 1;
> +	case BIT(ISL7998x_PAD_VIN1) | BIT(ISL7998x_PAD_VIN2):
> +		return 2;
> +	case BIT(ISL7998x_PAD_VIN1) | BIT(ISL7998x_PAD_VIN2) |
> +	     BIT(ISL7998x_PAD_VIN3) | BIT(ISL7998x_PAD_VIN4):
> +		return 4;
> +	default:
> +		return -EINVAL;
> +	}
> +}
> +
> +static int isl7998x_wait_power_on(struct isl7998x *isl7998x)
> +{
> +	struct device *dev = isl7998x->subdev.dev;
> +	u32 chip_id;
> +	int ret;
> +	int err;
> +
> +	ret = read_poll_timeout(regmap_read, err, !err, 2000, 20000, false,
> +				isl7998x->regmap,
> +				ISL7998x_REG_P0_PRODUCT_ID_CODE, &chip_id);
> +	if (ret) {
> +		dev_err(dev, "timeout while waiting for ISL7998x\n");
> +		return ret;
> +	}
> +
> +	dev_dbg(dev, "Found ISL799%x\n", chip_id);
> +
> +	return ret;
> +}
> +
> +static int isl7998x_init(struct isl7998x *isl7998x)
> +{
> +	const unsigned int lanes = isl7998x->nr_mipi_lanes;
> +	const u32 isl7998x_video_in_chan_map[] = { 0x00, 0x11, 0x02, 0x02 };
> +	const struct reg_sequence isl7998x_init_seq_custom[] = {
> +		{ ISL7998x_REG_P0_VIDEO_IN_CHAN_CTL,
> +		  isl7998x_video_in_chan_map[isl7998x->nr_inputs - 1] },
> +		{ ISL7998x_REG_P0_CLK_CTL_4,
> +		  (lanes == 1) ? 0x40 : 0x41 },
> +		{ ISL7998x_REG_P5_LI_ENGINE_CTL,
> +		  (lanes == 1) ? 0x01 : 0x02 },
> +		{ ISL7998x_REG_P5_LI_ENGINE_LINE_CTL,
> +		  0x20 | ((isl7998x->mode->width >> 7) & 0x1f) },
> +		{ ISL7998x_REG_P5_LI_ENGINE_PIC_WIDTH,
> +		  (isl7998x->mode->width << 1) & 0xff },
> +	};
> +	struct device *dev = isl7998x->subdev.dev;
> +	struct regmap *regmap = isl7998x->regmap;
> +	int ret;
> +
> +	dev_dbg(dev, "configuring %d lanes for %d inputs (%dx%d)\n",
> +		isl7998x->nr_mipi_lanes, isl7998x->nr_inputs,
> +		isl7998x->mode->width, isl7998x->mode->height);
> +
> +	ret = regmap_register_patch(regmap, isl7998x_init_seq_1,
> +				    ARRAY_SIZE(isl7998x_init_seq_1));
> +	if (ret)
> +		return ret;
> +
> +	ret = regmap_register_patch(regmap, isl7998x_init_seq_custom,
> +				    ARRAY_SIZE(isl7998x_init_seq_custom));
> +	if (ret)
> +		return ret;
> +
> +	return regmap_register_patch(regmap, isl7998x_init_seq_2,
> +				     ARRAY_SIZE(isl7998x_init_seq_2));
> +}
> +
> +static const struct isl7998x_video_std {
> +	int id;
> +	const char *name;
> +	const struct isl7998x_mode *mode;
> +} isl7998x_std_res[] = {
> +	{ 0, "NTSC (M)", &supported_modes[1]},
> +	{ 1, "PAL (B, D, G, H, I)", &supported_modes[0]},
> +	{ 2, "SECAM", &supported_modes[0]},
> +	{ 3, "NTSC4.43", &supported_modes[1]},
> +	{ 4, "PAL (M)", &supported_modes[1]},
> +	{ 5, "PAL (CN)", &supported_modes[0]},
> +	{ 6, "PAL 60", &supported_modes[1]},
> +	{ 7, "N/A", NULL},
> +};
> +
> +/*
> + * Detect and set video standard on video inputs.
> + */
> +static int isl7998x_update_std(struct isl7998x *isl7998x)
> +{
> +#define ISL7998x_INPUTS			4
> +	struct device *dev = isl7998x->subdev.dev;
> +	unsigned int std_id[ISL7998x_INPUTS];
> +	unsigned int i;
> +	int ret;
> +	u32 reg;
> +
> +	ret = pm_runtime_resume_and_get(dev);
> +	if (ret)
> +		return ret;
> +
> +	for (i = 0; i < ISL7998x_INPUTS; i++) {
> +		ret = regmap_read_poll_timeout(isl7998x->regmap,
> +				ISL7998x_REG_Px_DEC_SDT(i + 1),
> +				reg, reg & ISL7998x_REG_Px_DEC_SDT_DET,
> +				2000, 500 * USEC_PER_MSEC);
> +		std_id[i] = FIELD_GET(ISL7998x_REG_Px_DEC_SDT_NOW, reg);

Hmm, what happens if there is no signal for this input? Does it pick a random
standard? Or is it N/A?

> +		if (ret)
> +			goto out;
> +	}
> +
> +	/*
> +	 * According to Renesas FAE, all input cameras must have the
> +	 * same standard on this chip.
> +	 */
> +	for (i = 0; i < isl7998x->nr_inputs; i++) {
> +		dev_dbg(dev, "input %d: detected %s\n",
> +			i, isl7998x_std_res[std_id[i]].name);
> +		if (std_id[0] != std_id[i])
> +			dev_warn(dev,
> +				 "incompatible standards: %s on input %d (expected %s)\n",
> +				 isl7998x_std_res[std_id[i]].name, i,
> +				 isl7998x_std_res[std_id[0]].name);

It is probably fine if some of the inputs are N/A, as long as the others are
a match.

> +	}
> +
> +	isl7998x->mode = isl7998x_std_res[std_id[0]].mode;

Nack. That's not how video receivers work. Everyone who writes a driver for a
video receiver for the first time makes the same mistake...

The driver must support VIDIOC_SUBDEV_G/S_STD, ENUMSTD and QUERYSTD ioctls.
To support VIDIOC_SUBDEV_ENUMSTD the driver must implement the g_tvnorms subdev op,
which returns the mask of supported standards.

QUERYSTD will return the detected standard for all inputs. That is effectively
isl7998x_update_std(), except without the actual updating of the mode part, i.e.
it just detects and changes nothing.

If there are incompatible standards detected for different inputs, then you can
either just pick one or return -ENODATA.

VIDIOC_SUBDEV_G_STD returns the currently selected standard (typically probe will
initialize this to NTSC) and VIDIOC_SUBDEV_S_STD sets the standard.

The typical userspace usage is to call QUERYSTD first, then call S_STD with what
QUERYSTD detected.

Setting a new standard will automatically change the width and height and reset
any cropping. If streaming is in progress, then changing to a different standard
(and thus resolution) is not allowed and S_STD must return -EBUSY.

You can't change the format to something different from the standard, unless there
is a scaler, in which case the video is scaled to the requested format. So for
video receivers S_FMT will typically just overwrite the width and height depending
on the current standard.

Also implement the g_input_status subdev op to give feedback to userspace whether
or not there is a signal.

If the hardware supports detecting signal (standard) changes through e.g. an interrupt,
then you can raise the V4L2_EVENT_SOURCE_CHANGE event to tell userspace about this,
but for some reason this is rarely present in video receivers.

> +
> +out:
> +	pm_runtime_put(dev);
> +
> +	return ret;
> +}
> +
> +static int isl7998x_set_test_pattern(struct isl7998x *isl7998x)
> +{
> +	const struct reg_sequence isl7998x_init_seq_tpg_off[] = {
> +		{ ISL7998x_REG_P5_LI_ENGINE_TP_GEN_CTL, 0 },
> +		{ ISL7998x_REG_P5_LI_ENGINE_CTL_2, 0 }
> +	};
> +	const struct reg_sequence isl7998x_init_seq_tpg_on[] = {
> +		{ ISL7998x_REG_P5_TP_GEN_BAR_PATTERN,
> +		  isl7998x->test_pattern_bars << 6 },
> +		{ ISL7998x_REG_P5_LI_ENGINE_CTL_2,
> +		  isl7998x->test_pattern == 1 ? BIT(2) : 0 },
> +		{ ISL7998x_REG_P5_LI_ENGINE_TP_GEN_CTL,
> +		  (isl7998x->test_pattern_chans << 4) |
> +		  (isl7998x->test_pattern_color << 2) }
> +	};
> +	struct device *dev = isl7998x->subdev.dev;
> +	struct regmap *regmap = isl7998x->regmap;
> +	int ret;
> +
> +	if (!pm_runtime_enabled(dev) || !pm_runtime_get_if_in_use(dev))
> +		return 0;
> +
> +	if (isl7998x->test_pattern != 0) {
> +		dev_dbg(dev, "test pattern: %s, channels 0x%x, %s, %s\n",
> +			isl7998x_test_pattern_menu[isl7998x->test_pattern],
> +			isl7998x->test_pattern_chans,
> +			isl7998x_test_pattern_bars[isl7998x->test_pattern_bars],
> +			isl7998x_test_pattern_colors[isl7998x->test_pattern_color]);
> +		ret = regmap_register_patch(regmap, isl7998x_init_seq_tpg_on,
> +					    ARRAY_SIZE(isl7998x_init_seq_tpg_on));
> +	} else {
> +		ret = regmap_register_patch(regmap, isl7998x_init_seq_tpg_off,
> +					    ARRAY_SIZE(isl7998x_init_seq_tpg_off));
> +	}
> +
> +	pm_runtime_put(dev);
> +
> +	return ret;
> +}
> +
> +#ifdef CONFIG_VIDEO_ADV_DEBUG
> +static int isl7998x_g_register(struct v4l2_subdev *sd,
> +			       struct v4l2_dbg_register *reg)
> +{
> +	struct isl7998x *isl7998x = sd_to_isl7998x(sd);
> +	int ret;
> +	u32 val;
> +
> +	ret = regmap_read(isl7998x->regmap, reg->reg, &val);
> +	if (ret)
> +		return ret;
> +
> +	reg->size = 1;
> +	reg->val = val;
> +
> +	return 0;
> +}
> +
> +static int isl7998x_s_register(struct v4l2_subdev *sd,
> +			       const struct v4l2_dbg_register *reg)
> +{
> +	struct isl7998x *isl7998x = sd_to_isl7998x(sd);
> +
> +	return regmap_write(isl7998x->regmap, reg->reg, reg->val);
> +}
> +#endif
> +
> +static int isl7998x_s_stream(struct v4l2_subdev *sd, int enable)
> +{
> +	struct isl7998x *isl7998x = sd_to_isl7998x(sd);
> +	struct i2c_client *client = v4l2_get_subdevdata(sd);
> +	struct device *dev = &client->dev;
> +	int ret = 0;
> +	u32 reg;
> +
> +	dev_dbg(dev, "stream %s\n", enable ? "ON" : "OFF");
> +
> +	if (enable) {
> +		ret = isl7998x_set_test_pattern(isl7998x);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	regmap_read(isl7998x->regmap,
> +		    ISL7998x_REG_P5_LI_ENGINE_CTL, &reg);
> +	if (enable)
> +		reg &= ~BIT(7);
> +	else
> +		reg |= BIT(7);
> +	ret = regmap_write(isl7998x->regmap,
> +			   ISL7998x_REG_P5_LI_ENGINE_CTL, reg);
> +
> +	return ret;
> +}
> +
> +static int isl7998x_pre_streamon(struct v4l2_subdev *sd, u32 flags)
> +{
> +	struct i2c_client *client = v4l2_get_subdevdata(sd);
> +	struct device *dev = &client->dev;
> +
> +	if (flags & V4L2_SUBDEV_PRE_STREAMON_FL_MANUAL_LP)
> +		return pm_runtime_resume_and_get(dev);
> +
> +	return 0;
> +}
> +
> +static int isl7998x_post_streamoff(struct v4l2_subdev *sd)
> +{
> +	struct i2c_client *client = v4l2_get_subdevdata(sd);
> +	struct device *dev = &client->dev;
> +
> +	pm_runtime_put(dev);
> +
> +	return 0;
> +}
> +
> +static int isl7998x_enum_mbus_code(struct v4l2_subdev *sd,
> +				   struct v4l2_subdev_state *sd_state,
> +				   struct v4l2_subdev_mbus_code_enum *code)
> +{
> +	if (code->index >= ARRAY_SIZE(isl7998x_colour_fmts))
> +		return -EINVAL;
> +
> +	code->code = isl7998x_colour_fmts[code->index].code;
> +
> +	return 0;
> +}
> +
> +static int isl7998x_enum_frame_size(struct v4l2_subdev *sd,
> +				    struct v4l2_subdev_state *sd_state,
> +				    struct v4l2_subdev_frame_size_enum *fse)
> +{
> +	if (fse->index >= ARRAY_SIZE(supported_modes))
> +		return -EINVAL;
> +
> +	if (fse->code != isl7998x_colour_fmts[0].code)
> +		return -EINVAL;
> +
> +	fse->min_width = supported_modes[fse->index].width;
> +	fse->max_width = fse->min_width;
> +	fse->min_height = supported_modes[fse->index].height;
> +	fse->max_height = fse->min_height;
> +
> +	return 0;
> +}
> +
> +static int isl7998x_get_fmt(struct v4l2_subdev *sd,
> +			    struct v4l2_subdev_state *sd_state,
> +			    struct v4l2_subdev_format *format)
> +{
> +	struct isl7998x *isl7998x = sd_to_isl7998x(sd);
> +	struct v4l2_mbus_framefmt *mf = &format->format;
> +	const struct isl7998x_mode *mode = isl7998x_get_mode(isl7998x);
> +
> +	if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
> +		format->format = *v4l2_subdev_get_try_format(sd, sd_state,
> +							     format->pad);
> +		return 0;
> +	}
> +
> +	mf->width	= mode->width;
> +	mf->height	= mode->height;
> +	mf->code	= isl7998x->fmt->code;
> +	mf->field	= mode->field;
> +	mf->colorspace	= 0;
> +
> +	return 0;
> +}
> +
> +static int isl7998x_set_fmt(struct v4l2_subdev *sd,
> +			    struct v4l2_subdev_state *sd_state,
> +			    struct v4l2_subdev_format *format)
> +{
> +	struct isl7998x *isl7998x = sd_to_isl7998x(sd);
> +	struct v4l2_mbus_framefmt *mf = &format->format;
> +	const struct isl7998x_mode *mode = isl7998x_get_mode(isl7998x);
> +
> +	mf->width = mode->width;
> +	mf->height = mode->height;
> +	mf->code = isl7998x->fmt->code;
> +	mf->field = mode->field;
> +
> +	if (format->which == V4L2_SUBDEV_FORMAT_TRY)
> +		*v4l2_subdev_get_try_format(sd, sd_state, format->pad) = format->format;
> +
> +	return 0;
> +}
> +
> +static int isl7998x_set_ctrl(struct v4l2_ctrl *ctrl)
> +{
> +	struct isl7998x *isl7998x = container_of(ctrl->handler,
> +						 struct isl7998x, ctrl_handler);
> +
> +	switch (ctrl->id) {
> +	case V4L2_CID_TEST_PATTERN_BARS:
> +		isl7998x->test_pattern_bars = ctrl->val & 0x3;
> +		return isl7998x_set_test_pattern(isl7998x);
> +	case V4L2_CID_TEST_PATTERN_CHANNELS:
> +		isl7998x->test_pattern_chans = ctrl->val & 0xf;
> +		return isl7998x_set_test_pattern(isl7998x);
> +	case V4L2_CID_TEST_PATTERN_COLOR:
> +		isl7998x->test_pattern_color = ctrl->val & 0x3;
> +		return isl7998x_set_test_pattern(isl7998x);
> +	case V4L2_CID_TEST_PATTERN:
> +		isl7998x->test_pattern = ctrl->val;
> +		return isl7998x_set_test_pattern(isl7998x);
> +	}
> +
> +	return 0;
> +}
> +
> +static const struct v4l2_subdev_core_ops isl7998x_subdev_core_ops = {
> +#ifdef CONFIG_VIDEO_ADV_DEBUG
> +	.g_register	= isl7998x_g_register,
> +	.s_register	= isl7998x_s_register,
> +#endif
> +};
> +
> +static const struct v4l2_subdev_video_ops isl7998x_subdev_video_ops = {
> +	.s_stream	= isl7998x_s_stream,
> +	.pre_streamon	= isl7998x_pre_streamon,
> +	.post_streamoff	= isl7998x_post_streamoff,
> +};
> +
> +static const struct v4l2_subdev_pad_ops isl7998x_subdev_pad_ops = {
> +	.enum_mbus_code		= isl7998x_enum_mbus_code,
> +	.enum_frame_size	= isl7998x_enum_frame_size,
> +	.get_fmt		= isl7998x_get_fmt,
> +	.set_fmt		= isl7998x_set_fmt,
> +};
> +
> +static const struct v4l2_subdev_ops isl7998x_subdev_ops = {
> +	.core		= &isl7998x_subdev_core_ops,
> +	.video		= &isl7998x_subdev_video_ops,
> +	.pad		= &isl7998x_subdev_pad_ops,
> +};
> +
> +static const struct media_entity_operations isl7998x_entity_ops = {
> +	.link_validate = v4l2_subdev_link_validate,
> +};
> +
> +static const struct v4l2_ctrl_ops isl7998x_ctrl_ops = {
> +	.s_ctrl			= isl7998x_set_ctrl,
> +};
> +
> +static const struct v4l2_ctrl_config isl7998x_ctrls[] = {
> +	{
> +		.ops		= &isl7998x_ctrl_ops,
> +		.id		= V4L2_CID_TEST_PATTERN_BARS,
> +		.type		= V4L2_CTRL_TYPE_MENU,
> +		.name		= "Test Pattern Bars",
> +		.max		= ARRAY_SIZE(isl7998x_test_pattern_bars) - 1,
> +		.def		= 0,
> +		.qmenu		= isl7998x_test_pattern_bars,
> +	}, {
> +		.ops		= &isl7998x_ctrl_ops,
> +		.id		= V4L2_CID_TEST_PATTERN_CHANNELS,
> +		.type		= V4L2_CTRL_TYPE_INTEGER,
> +		.name		= "Test Pattern Channels",
> +		.min		= 0,
> +		.max		= 0xf,
> +		.step		= 1,
> +		.def		= 0xf,
> +		.flags		= 0,
> +	}, {
> +		.ops		= &isl7998x_ctrl_ops,
> +		.id		= V4L2_CID_TEST_PATTERN_COLOR,
> +		.type		= V4L2_CTRL_TYPE_MENU,
> +		.name		= "Test Pattern Color",
> +		.max		= ARRAY_SIZE(isl7998x_test_pattern_colors) - 1,
> +		.def		= 0,
> +		.qmenu		= isl7998x_test_pattern_colors,
> +	},

How exactly do these interact? How does it work precisely?

Regards,

	Hans

> +};
> +
> +#define ISL7998x_REG_DECODER_ACA_READABLE_RANGE(page)			\
> +	/* Decoder range */						\
> +	regmap_reg_range(ISL7998x_REG_Px_DEC_INPUT_FMT(page),		\
> +			 ISL7998x_REG_Px_DEC_HS_DELAY_CTL(page)),	\
> +	regmap_reg_range(ISL7998x_REG_Px_DEC_ANCTL(page),		\
> +			 ISL7998x_REG_Px_DEC_CSC_CTL(page)),		\
> +	regmap_reg_range(ISL7998x_REG_Px_DEC_BRIGHT(page),		\
> +			 ISL7998x_REG_Px_DEC_HUE(page)),		\
> +	regmap_reg_range(ISL7998x_REG_Px_DEC_VERT_PEAK(page),		\
> +			 ISL7998x_REG_Px_DEC_CORING(page)),		\
> +	regmap_reg_range(ISL7998x_REG_Px_DEC_SDT(page),			\
> +			 ISL7998x_REG_Px_DEC_SDTR(page)),		\
> +	regmap_reg_range(ISL7998x_REG_Px_DEC_CLMPG(page),		\
> +			 ISL7998x_REG_Px_DEC_DATA_CONV(page)),		\
> +	regmap_reg_range(ISL7998x_REG_Px_DEC_INTERNAL_TEST(page),	\
> +			 ISL7998x_REG_Px_DEC_INTERNAL_TEST(page)),	\
> +	regmap_reg_range(ISL7998x_REG_Px_DEC_H_DELAY_CTL(page),		\
> +			 ISL7998x_REG_Px_DEC_H_DELAY_II_LOW(page)),	\
> +	/* ACA range */							\
> +	regmap_reg_range(ISL7998x_REG_Px_ACA_CTL_1(page),		\
> +			 ISL7998x_REG_Px_ACA_HIST_WIN_V_SZ2(page)),	\
> +	regmap_reg_range(ISL7998x_REG_Px_ACA_Y_AVG(page),		\
> +			 ISL7998x_REG_Px_ACA_CTL_4(page)),		\
> +	regmap_reg_range(ISL7998x_REG_Px_ACA_FLEX_WIN_HIST(page),	\
> +			 ISL7998x_REG_Px_ACA_XFER_HIST_HOST(page)),	\
> +	regmap_reg_range(ISL7998x_REG_Px_DEC_PAGE(page),		\
> +			 ISL7998x_REG_Px_DEC_PAGE(page))
> +
> +#define ISL7998x_REG_DECODER_ACA_WRITEABLE_RANGE(page)			\
> +	/* Decoder range */						\
> +	regmap_reg_range(ISL7998x_REG_Px_DEC_INPUT_FMT(page),		\
> +			 ISL7998x_REG_Px_DEC_INPUT_FMT(page)),		\
> +	regmap_reg_range(ISL7998x_REG_Px_DEC_HS_DELAY_CTL(page),	\
> +			 ISL7998x_REG_Px_DEC_HS_DELAY_CTL(page)),	\
> +	regmap_reg_range(ISL7998x_REG_Px_DEC_ANCTL(page),		\
> +			 ISL7998x_REG_Px_DEC_CSC_CTL(page)),		\
> +	regmap_reg_range(ISL7998x_REG_Px_DEC_BRIGHT(page),		\
> +			 ISL7998x_REG_Px_DEC_HUE(page)),		\
> +	regmap_reg_range(ISL7998x_REG_Px_DEC_VERT_PEAK(page),		\
> +			 ISL7998x_REG_Px_DEC_CORING(page)),		\
> +	regmap_reg_range(ISL7998x_REG_Px_DEC_SDT(page),			\
> +			 ISL7998x_REG_Px_DEC_SDTR(page)),		\
> +	regmap_reg_range(ISL7998x_REG_Px_DEC_CLMPG(page),		\
> +			 ISL7998x_REG_Px_DEC_MISC3(page)),		\
> +	regmap_reg_range(ISL7998x_REG_Px_DEC_CLMD(page),		\
> +			 ISL7998x_REG_Px_DEC_DATA_CONV(page)),		\
> +	regmap_reg_range(ISL7998x_REG_Px_DEC_INTERNAL_TEST(page),	\
> +			 ISL7998x_REG_Px_DEC_INTERNAL_TEST(page)),	\
> +	regmap_reg_range(ISL7998x_REG_Px_DEC_H_DELAY_CTL(page),		\
> +			 ISL7998x_REG_Px_DEC_H_DELAY_II_LOW(page)),	\
> +	/* ACA range */							\
> +	regmap_reg_range(ISL7998x_REG_Px_ACA_CTL_1(page),		\
> +			 ISL7998x_REG_Px_ACA_HIST_WIN_V_SZ2(page)),	\
> +	regmap_reg_range(ISL7998x_REG_Px_ACA_CTL_2(page),		\
> +			 ISL7998x_REG_Px_ACA_CTL_4(page)),		\
> +	regmap_reg_range(ISL7998x_REG_Px_ACA_FLEX_WIN_HIST(page),	\
> +			 ISL7998x_REG_Px_ACA_HIST_DATA_LO(page)),	\
> +	regmap_reg_range(ISL7998x_REG_Px_ACA_XFER_HIST_HOST(page),	\
> +			 ISL7998x_REG_Px_ACA_XFER_HIST_HOST(page)),	\
> +	regmap_reg_range(ISL7998x_REG_Px_DEC_PAGE(page),		\
> +			 ISL7998x_REG_Px_DEC_PAGE(page))
> +
> +#define ISL7998x_REG_DECODER_ACA_VOLATILE_RANGE(page)			\
> +	/* Decoder range */						\
> +	regmap_reg_range(ISL7998x_REG_Px_DEC_STATUS_1(page),		\
> +			 ISL7998x_REG_Px_DEC_STATUS_1(page)),		\
> +	regmap_reg_range(ISL7998x_REG_Px_DEC_SDT(page),			\
> +			 ISL7998x_REG_Px_DEC_SDT(page)),		\
> +	regmap_reg_range(ISL7998x_REG_Px_DEC_MVSN(page),		\
> +			 ISL7998x_REG_Px_DEC_HFREF(page)),		\
> +	/* ACA range */							\
> +	regmap_reg_range(ISL7998x_REG_Px_ACA_Y_AVG(page),		\
> +			 ISL7998x_REG_Px_ACA_Y_HIGH(page)),		\
> +	regmap_reg_range(ISL7998x_REG_Px_ACA_HIST_DATA_LO(page),	\
> +			 ISL7998x_REG_Px_ACA_FLEX_WIN_CR_CLR(page))
> +
> +static const struct regmap_range isl7998x_readable_ranges[] = {
> +	regmap_reg_range(ISL7998x_REG_P0_PRODUCT_ID_CODE,
> +			 ISL7998x_REG_P0_IRQ_SYNC_CTL),
> +	regmap_reg_range(ISL7998x_REG_P0_INTERRUPT_STATUS,
> +			 ISL7998x_REG_P0_CLOCK_DELAY),
> +	regmap_reg_range(ISL7998x_REG_Px_DEC_PAGE(0),
> +			 ISL7998x_REG_Px_DEC_PAGE(0)),
> +
> +	ISL7998x_REG_DECODER_ACA_READABLE_RANGE(1),
> +	ISL7998x_REG_DECODER_ACA_READABLE_RANGE(2),
> +	ISL7998x_REG_DECODER_ACA_READABLE_RANGE(3),
> +	ISL7998x_REG_DECODER_ACA_READABLE_RANGE(4),
> +
> +	regmap_reg_range(ISL7998x_REG_P5_LI_ENGINE_CTL,
> +			 ISL7998x_REG_P5_MIPI_SP_HS_TRL_CTL),
> +	regmap_reg_range(ISL7998x_REG_P5_FIFO_THRSH_CNT_1,
> +			 ISL7998x_REG_P5_PLL_ANA),
> +	regmap_reg_range(ISL7998x_REG_P5_TOTAL_PF_LINE_CNT_1,
> +			 ISL7998x_REG_P5_HIST_LINE_CNT_2),
> +	regmap_reg_range(ISL7998x_REG_Px_DEC_PAGE(5),
> +			 ISL7998x_REG_Px_DEC_PAGE(5)),
> +};
> +
> +static const struct regmap_range isl7998x_writeable_ranges[] = {
> +	regmap_reg_range(ISL7998x_REG_P0_SW_RESET_CTL,
> +			 ISL7998x_REG_P0_IRQ_SYNC_CTL),
> +	regmap_reg_range(ISL7998x_REG_P0_CHAN_1_IRQ,
> +			 ISL7998x_REG_P0_SHORT_DIAG_IRQ_EN),
> +	regmap_reg_range(ISL7998x_REG_P0_CLOCK_DELAY,
> +			 ISL7998x_REG_P0_CLOCK_DELAY),
> +	regmap_reg_range(ISL7998x_REG_Px_DEC_PAGE(0),
> +			 ISL7998x_REG_Px_DEC_PAGE(0)),
> +
> +	ISL7998x_REG_DECODER_ACA_WRITEABLE_RANGE(1),
> +	ISL7998x_REG_DECODER_ACA_WRITEABLE_RANGE(2),
> +	ISL7998x_REG_DECODER_ACA_WRITEABLE_RANGE(3),
> +	ISL7998x_REG_DECODER_ACA_WRITEABLE_RANGE(4),
> +
> +	regmap_reg_range(ISL7998x_REG_P5_LI_ENGINE_CTL,
> +			 ISL7998x_REG_P5_ESC_MODE_TIME_CTL),
> +	regmap_reg_range(ISL7998x_REG_P5_MIPI_SP_HS_TRL_CTL,
> +			 ISL7998x_REG_P5_PLL_ANA),
> +	regmap_reg_range(ISL7998x_REG_P5_TOTAL_PF_LINE_CNT_1,
> +			 ISL7998x_REG_P5_HIST_LINE_CNT_2),
> +	regmap_reg_range(ISL7998x_REG_Px_DEC_PAGE(5),
> +			 ISL7998x_REG_Px_DEC_PAGE(5)),
> +
> +	ISL7998x_REG_DECODER_ACA_WRITEABLE_RANGE(0xf),
> +};
> +
> +static const struct regmap_range isl7998x_volatile_ranges[] = {
> +	/* Product id code register is used to check availability */
> +	regmap_reg_range(ISL7998x_REG_P0_PRODUCT_ID_CODE,
> +			 ISL7998x_REG_P0_PRODUCT_ID_CODE),
> +	regmap_reg_range(ISL7998x_REG_P0_MPP1_SYNC_CTL,
> +			 ISL7998x_REG_P0_IRQ_SYNC_CTL),
> +	regmap_reg_range(ISL7998x_REG_P0_INTERRUPT_STATUS,
> +			 ISL7998x_REG_P0_INTERRUPT_STATUS),
> +	regmap_reg_range(ISL7998x_REG_P0_CHAN_1_STATUS,
> +			 ISL7998x_REG_P0_SHORT_DIAG_STATUS),
> +
> +	ISL7998x_REG_DECODER_ACA_VOLATILE_RANGE(1),
> +	ISL7998x_REG_DECODER_ACA_VOLATILE_RANGE(2),
> +	ISL7998x_REG_DECODER_ACA_VOLATILE_RANGE(3),
> +	ISL7998x_REG_DECODER_ACA_VOLATILE_RANGE(4),
> +
> +	regmap_reg_range(ISL7998x_REG_P5_AUTO_TEST_ERR_DET,
> +			 ISL7998x_REG_P5_PIC_HEIGHT_LOW),
> +};
> +
> +static const struct regmap_access_table isl7998x_readable_table = {
> +	.yes_ranges = isl7998x_readable_ranges,
> +	.n_yes_ranges = ARRAY_SIZE(isl7998x_readable_ranges),
> +};
> +
> +static const struct regmap_access_table isl7998x_writeable_table = {
> +	.yes_ranges = isl7998x_writeable_ranges,
> +	.n_yes_ranges = ARRAY_SIZE(isl7998x_writeable_ranges),
> +};
> +
> +static const struct regmap_access_table isl7998x_volatile_table = {
> +	.yes_ranges = isl7998x_volatile_ranges,
> +	.n_yes_ranges = ARRAY_SIZE(isl7998x_volatile_ranges),
> +};
> +
> +static const struct regmap_range_cfg isl7998x_ranges[] = {
> +	{
> +		.range_min	= ISL7998x_REG_Pn_BASE(0),
> +		.range_max	= ISL7998x_REG_Px_ACA_XFER_HIST_HOST(0xf),
> +		.selector_reg	= ISL7998x_REG_Px_DEC_PAGE(0),
> +		.selector_mask	= ISL7998x_REG_Px_DEC_PAGE_MASK,
> +		.window_start	= 0,
> +		.window_len	= 256,
> +	}
> +};
> +
> +static const struct regmap_config isl7998x_regmap = {
> +	.reg_bits	= 8,
> +	.val_bits	= 8,
> +	.max_register	= ISL7998x_REG_Px_ACA_XFER_HIST_HOST(0xf),
> +	.ranges		= isl7998x_ranges,
> +	.num_ranges	= ARRAY_SIZE(isl7998x_ranges),
> +	.rd_table	= &isl7998x_readable_table,
> +	.wr_table	= &isl7998x_writeable_table,
> +	.volatile_table	= &isl7998x_volatile_table,
> +	.cache_type	= REGCACHE_RBTREE,
> +};
> +
> +static int isl7998x_mc_init(struct isl7998x *isl7998x)
> +{
> +	unsigned int i;
> +
> +	isl7998x->subdev.entity.ops = &isl7998x_entity_ops;
> +	isl7998x->subdev.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
> +
> +	isl7998x->pads[ISL7998x_PAD_OUT].flags = MEDIA_PAD_FL_SOURCE;
> +	for (i = ISL7998x_PAD_VIN1; i < ISL7998x_NUM_PADS; i++)
> +		isl7998x->pads[i].flags = MEDIA_PAD_FL_SINK;
> +
> +	return media_entity_pads_init(&isl7998x->subdev.entity,
> +				      ISL7998x_NUM_PADS,
> +				      isl7998x->pads);
> +}
> +
> +static int get_link_freq_menu_index(unsigned int lanes,
> +				    unsigned int inputs)
> +{
> +	int ret = -EINVAL;
> +
> +	switch (lanes) {
> +	case 1:
> +		if (inputs == 1)
> +			ret = 0;
> +		if (inputs == 2)
> +			ret = 1;
> +		if (inputs == 4)
> +			ret = 2;
> +		break;
> +	case 2:
> +		if (inputs == 2)
> +			ret = 0;
> +		if (inputs == 4)
> +			ret = 1;
> +		break;
> +	default:
> +		break;
> +	}
> +
> +	return ret;
> +}
> +
> +static int isl7998x_init_controls(struct isl7998x *isl7998x)
> +{
> +	struct v4l2_subdev *sd = &isl7998x->subdev;
> +	int link_freq_index;
> +	unsigned int i;
> +	int ret;
> +
> +	ret = v4l2_ctrl_handler_init(&isl7998x->ctrl_handler,
> +				     2 + ARRAY_SIZE(isl7998x_ctrls));
> +	if (ret)
> +		return ret;
> +
> +	mutex_init(&isl7998x->ctrl_mutex);
> +	isl7998x->ctrl_handler.lock = &isl7998x->ctrl_mutex;
> +	link_freq_index = get_link_freq_menu_index(isl7998x->nr_mipi_lanes,
> +						   isl7998x->nr_inputs);
> +	if (link_freq_index < 0 ||
> +	    link_freq_index >= ARRAY_SIZE(link_freq_menu_items)) {
> +		dev_err(sd->dev,
> +			"failed to find MIPI link freq: %d lanes, %d inputs\n",
> +			isl7998x->nr_mipi_lanes, isl7998x->nr_inputs);
> +		ret = -EINVAL;
> +		goto err;
> +	}
> +
> +	isl7998x->link_freq = v4l2_ctrl_new_int_menu(&isl7998x->ctrl_handler,
> +						     &isl7998x_ctrl_ops,
> +						     V4L2_CID_LINK_FREQ,
> +						     ARRAY_SIZE(link_freq_menu_items) - 1,
> +						     link_freq_index,
> +						     link_freq_menu_items);
> +	if (isl7998x->link_freq)
> +		isl7998x->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;
> +
> +	for (i = 0; i < ARRAY_SIZE(isl7998x_ctrls); i++)
> +		v4l2_ctrl_new_custom(&isl7998x->ctrl_handler,
> +				     &isl7998x_ctrls[i], NULL);
> +
> +	v4l2_ctrl_new_std_menu_items(&isl7998x->ctrl_handler,
> +				     &isl7998x_ctrl_ops,
> +				     V4L2_CID_TEST_PATTERN,
> +				     ARRAY_SIZE(isl7998x_test_pattern_menu) - 1,
> +				     0, 0, isl7998x_test_pattern_menu);
> +
> +	ret = isl7998x->ctrl_handler.error;
> +	if (ret)
> +		goto err;
> +
> +	isl7998x->subdev.ctrl_handler = &isl7998x->ctrl_handler;
> +	v4l2_ctrl_handler_setup(&isl7998x->ctrl_handler);
> +
> +	return 0;
> +
> +err:
> +	mutex_destroy(&isl7998x->ctrl_mutex);
> +
> +	return ret;
> +}
> +
> +static void isl7998x_remove_controls(struct isl7998x *isl7998x)
> +{
> +	v4l2_ctrl_handler_free(isl7998x->subdev.ctrl_handler);
> +	mutex_destroy(&isl7998x->ctrl_mutex);
> +}
> +
> +static int isl7998x_probe(struct i2c_client *client)
> +{
> +	struct device *dev = &client->dev;
> +	struct v4l2_fwnode_endpoint endpoint = {
> +		.bus_type = V4L2_MBUS_CSI2_DPHY,
> +	};
> +	struct fwnode_handle *ep;
> +	struct isl7998x *isl7998x;
> +	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
> +	int nr_inputs;
> +	int ret;
> +
> +	ret = i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA);
> +	if (!ret) {
> +		dev_warn(&adapter->dev,
> +			 "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
> +		return -EIO;
> +	}
> +
> +	isl7998x = devm_kzalloc(dev, sizeof(*isl7998x), GFP_KERNEL);
> +	if (!isl7998x)
> +		return -ENOMEM;
> +
> +	isl7998x->pd_gpio = devm_gpiod_get_optional(dev, "powerdown",
> +						    GPIOD_OUT_HIGH);
> +	if (IS_ERR(isl7998x->pd_gpio))
> +		return dev_err_probe(dev, PTR_ERR(isl7998x->pd_gpio),
> +				     "Failed to retrieve/request PD GPIO\n");
> +
> +	isl7998x->rstb_gpio = devm_gpiod_get_optional(dev, "reset",
> +						      GPIOD_OUT_HIGH);
> +	if (IS_ERR(isl7998x->rstb_gpio))
> +		return dev_err_probe(dev, PTR_ERR(isl7998x->rstb_gpio),
> +				     "Failed to retrieve/request RSTB GPIO\n");
> +
> +	isl7998x->regmap = devm_regmap_init_i2c(client, &isl7998x_regmap);
> +	if (IS_ERR(isl7998x->regmap))
> +		return dev_err_probe(dev, PTR_ERR(isl7998x->regmap),
> +				     "Failed to allocate register map\n");
> +
> +	ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev),
> +					     ISL7998x_PAD_OUT, 0, 0);
> +	if (!ep)
> +		return dev_err_probe(dev, -EINVAL, "Missing endpoint node\n");
> +
> +	ret = v4l2_fwnode_endpoint_parse(ep, &endpoint);
> +	fwnode_handle_put(ep);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "Failed to parse endpoint\n");
> +
> +	if (endpoint.bus.mipi_csi2.num_data_lanes == 0 ||
> +	    endpoint.bus.mipi_csi2.num_data_lanes > 2)
> +		return dev_err_probe(dev, -EINVAL,
> +				     "Invalid number of MIPI lanes\n");
> +
> +	isl7998x->nr_mipi_lanes = endpoint.bus.mipi_csi2.num_data_lanes;
> +
> +	nr_inputs = isl7998x_get_nr_inputs(dev->of_node);
> +	if (nr_inputs < 0)
> +		return dev_err_probe(dev, nr_inputs,
> +				     "Invalid number of input ports\n");
> +	isl7998x->nr_inputs = nr_inputs;
> +
> +	v4l2_i2c_subdev_init(&isl7998x->subdev, client, &isl7998x_subdev_ops);
> +	isl7998x->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> +
> +	ret = isl7998x_mc_init(isl7998x);
> +	if (ret < 0)
> +		return ret;
> +
> +	isl7998x->mode = &supported_modes[0];
> +	isl7998x->fmt = &isl7998x_colour_fmts[0];
> +
> +	ret = isl7998x_init_controls(isl7998x);
> +	if (ret)
> +		goto err_entity_cleanup;
> +
> +	ret = v4l2_async_register_subdev(&isl7998x->subdev);
> +	if (ret < 0)
> +		goto err_controls_cleanup;
> +
> +	pm_runtime_enable(dev);
> +
> +	ret = isl7998x_update_std(isl7998x);
> +	if (ret)
> +		goto err_init_cleanup;
> +
> +	return 0;
> +
> +err_init_cleanup:
> +	pm_runtime_disable(dev);
> +	v4l2_async_unregister_subdev(&isl7998x->subdev);
> +err_controls_cleanup:
> +	isl7998x_remove_controls(isl7998x);
> +err_entity_cleanup:
> +	media_entity_cleanup(&isl7998x->subdev.entity);
> +
> +	return ret;
> +}
> +
> +static int isl7998x_remove(struct i2c_client *client)
> +{
> +	struct isl7998x *isl7998x = i2c_to_isl7998x(client);
> +
> +	pm_runtime_disable(&client->dev);
> +	v4l2_async_unregister_subdev(&isl7998x->subdev);
> +	isl7998x_remove_controls(isl7998x);
> +	media_entity_cleanup(&isl7998x->subdev.entity);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id isl7998x_of_match[] = {
> +	{ .compatible = "isil,isl79987", },
> +	{ /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(of, isl7998x_of_match);
> +
> +static const struct i2c_device_id isl7998x_id[] = {
> +	{ "isl79987", 0 },
> +	{ /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(i2c, isl7998x_id);
> +
> +static int __maybe_unused isl7998x_runtime_resume(struct device *dev)
> +{
> +	struct v4l2_subdev *sd = dev_get_drvdata(dev);
> +	struct isl7998x *isl7998x = sd_to_isl7998x(sd);
> +	int ret;
> +
> +	gpiod_set_value(isl7998x->rstb_gpio, 1);
> +	gpiod_set_value(isl7998x->pd_gpio, 0);
> +	gpiod_set_value(isl7998x->rstb_gpio, 0);
> +
> +	ret = isl7998x_wait_power_on(isl7998x);
> +	if (ret)
> +		goto err;
> +
> +	return isl7998x_init(isl7998x);
> +
> +err:
> +	gpiod_set_value(isl7998x->pd_gpio, 1);
> +
> +	return ret;
> +}
> +
> +static int __maybe_unused isl7998x_runtime_suspend(struct device *dev)
> +{
> +	struct v4l2_subdev *sd = dev_get_drvdata(dev);
> +	struct isl7998x *isl7998x = sd_to_isl7998x(sd);
> +
> +	gpiod_set_value(isl7998x->pd_gpio, 1);
> +
> +	return 0;
> +}
> +
> +static const struct dev_pm_ops isl7998x_pm_ops = {
> +	SET_RUNTIME_PM_OPS(isl7998x_runtime_suspend,
> +			   isl7998x_runtime_resume,
> +			   NULL)
> +};
> +
> +static struct i2c_driver isl7998x_i2c_driver = {
> +	.driver = {
> +		.name = "isl7998x",
> +		.of_match_table = of_match_ptr(isl7998x_of_match),
> +		.pm = &isl7998x_pm_ops,
> +	},
> +	.probe_new	= isl7998x_probe,
> +	.remove		= isl7998x_remove,
> +	.id_table	= isl7998x_id,
> +};
> +
> +module_i2c_driver(isl7998x_i2c_driver);
> +
> +MODULE_DESCRIPTION("Intersil ISL7998x Analog to MIPI CSI-2/BT656 decoder");
> +MODULE_AUTHOR("Marek Vasut <[e-mail]>");
> +MODULE_LICENSE("GPL v2");
>

Michael Tretter Oct. 19, 2021, 12:33 p.m. UTC | #2

On Mon, 18 Oct 2021 15:57:29 +0200, Hans Verkuil wrote:
> Ah, I thought this was a camera sensor, but it is a video receiver. That's not
> the same as a camera sensor, and video receivers use a different API:
> VIDIOC_S/G_STD, VIDIOC_ENUMSTD and VIDIOC_QUERYSTD (or in this case the SUBDEV
> variants of these ioctls). See for more details below:
> 
> On 14/10/2021 15:31, Michael Tretter wrote:
> > From: Marek Vasut <[e-mail]>
> > 
> > Add driver for the Intersil ISL7998x Analog to MIPI CSI-2/BT656 decoder.
> > This chip supports 1/2/4 analog video inputs and converts them into
> > 1/2/4 VCs in MIPI CSI2 stream.
> > 
> > This driver currently supports ISL79987 and both 720x480 and 720x576
> > resolutions, however as per specification, all inputs must use the
> > same resolution and standard. The only supported pixel format is now
> > YUYV/YUV422. The chip should support RGB565 on the CSI2 as well, but
> > this is currently unsupported.
> > 
> > Signed-off-by: Marek Vasut <[e-mail]>
> > Cc: Sakari Ailus <[e-mail]>
> > Cc: Mauro Carvalho Chehab <[e-mail]>
> > Cc: Rob Herring <[e-mail]>
> > To: [e-mail]
> > Signed-off-by: Michael Tretter <[e-mail]>
> > ---
> > Changelog:
> > 
> > v6:
> > 
> > - remove unused log2.h
> > - add select MEDIA_CONTROLLER
> > - use poll_read_timeout to wait for power on
> > - add timeout to polling for video standard
> > - use fwnode_graph_get_endpoint_by_id
> > - fix invalid bus type error message
> > 
> > v5: none
> > 
> > v4:
> > 
> > - fix lines over 80 chars where applicable
> > - fix possible NULL pointer access in link_freq
> > - initialize bus type with CSI2_DPHY
> > - iterate over pads instead of hard coded 4
> > - merge power_{on,off} functions into resume,suspend
> > - switch to v4l2_subdev_state
> > - report field order based on video standard
> > - add error message for timeout
> > - simplify dev_dbg statement in update_std
> > - call v4l2_ctrl_handler_setup
> > - don't set control if pm_runtime is not enabled
> > - fix YUV422 byte order
> > - switch to pre_streamon callback for LP11 mode
> > 
> > v3:
> > 
> > - follow dt binding change: pd-gpios -> powerdown-gpios
> > 
> > v2:
> > 
> > - general cleanup
> > - remove isl7998x_g_mbus_config function
> > - implement enum_frame_size function
> > - replace msleep with usleep_range
> > - rework set_fmt/get_fmt functions
> > - calculate number of inputs using number of input ports
> > - switch to runtime_pm
> > - add reset gpio
> > - add adv_debug support
> > - add MAINTAINERS entry
> > ---
> >  MAINTAINERS                  |    8 +
> >  drivers/media/i2c/Kconfig    |   10 +
> >  drivers/media/i2c/Makefile   |    1 +
> >  drivers/media/i2c/isl7998x.c | 1394 ++++++++++++++++++++++++++++++++++
> >  4 files changed, 1413 insertions(+)
> >  create mode 100644 drivers/media/i2c/isl7998x.c
> > 
> 
> <snip>
> 
> > diff --git a/drivers/media/i2c/isl7998x.c b/drivers/media/i2c/isl7998x.c
> > new file mode 100644
> > index 000000000000..130e0b33b38a
> > --- /dev/null
> > +++ b/drivers/media/i2c/isl7998x.c
> > @@ -0,0 +1,1394 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Intersil ISL7998x analog to MIPI CSI-2 or BT.656 decoder driver.
> > + *
> > + * Copyright (C) 2018-2019 Marek Vasut <[e-mail]>
> > + * Copyright (C) 2021 Michael Tretter <[e-mail]>
> > + */
> > +
> > +#include <linux/bitfield.h>
> > +#include <linux/delay.h>
> > +#include <linux/gpio.h>
> > +#include <linux/i2c.h>
> > +#include <linux/module.h>
> > +#include <linux/of_graph.h>
> > +#include <linux/pm_runtime.h>
> > +#include <linux/regmap.h>
> > +#include <linux/slab.h>
> > +#include <linux/v4l2-mediabus.h>
> > +#include <linux/videodev2.h>
> > +
> > +#include <media/v4l2-async.h>
> > +#include <media/v4l2-common.h>
> > +#include <media/v4l2-ctrls.h>
> > +#include <media/v4l2-device.h>
> > +#include <media/v4l2-fwnode.h>
> > +
> > +#define V4L2_CID_TEST_PATTERN_COLOR	(V4L2_CID_USER_BASE | 0x1001)
> > +#define V4L2_CID_TEST_PATTERN_CHANNELS	(V4L2_CID_USER_BASE | 0x1002)
> > +#define V4L2_CID_TEST_PATTERN_BARS	(V4L2_CID_USER_BASE | 0x1003)
> 
> You must create a driver-specific range in v4l2-controls.h for these.
> See e.g. V4L2_CID_USER_CODA_BASE for how to do that.

Ack.

> 
> <snip>
> 
> > +
> > +enum isl7998x_pads {
> > +	ISL7998x_PAD_OUT,
> > +	ISL7998x_PAD_VIN1,
> > +	ISL7998x_PAD_VIN2,
> > +	ISL7998x_PAD_VIN3,
> > +	ISL7998x_PAD_VIN4,
> > +	ISL7998x_NUM_PADS
> > +};
> > +
> > +struct isl7998x_datafmt {
> > +	u32			code;
> > +	enum v4l2_colorspace	colorspace;
> > +};
> > +
> > +static const struct isl7998x_datafmt isl7998x_colour_fmts[] = {
> > +	{ MEDIA_BUS_FMT_UYVY8_2X8, V4L2_COLORSPACE_SRGB },
> > +};
> > +
> > +/* Menu items for LINK_FREQ V4L2 control */
> > +static const s64 link_freq_menu_items[] = {
> > +	/* 1 channel, 1 lane or 2 channels, 2 lanes */
> > +	108000000,
> > +	/* 2 channels, 1 lane or 4 channels, 2 lanes */
> > +	216000000,
> > +	/* 4 channels, 1 lane */
> > +	432000000,
> > +};
> > +
> > +/* Menu items for TEST_PATTERN V4L2 control */
> > +static const char * const isl7998x_test_pattern_menu[] = {
> > +	"Disabled",
> > +	"PAL (720x576)",
> > +	"NTSC (720x480)",
> > +};
> 
> Which test pattern should be used depends on the selected standard
> (VIDIOC_S_STD). So this menu can just be "Disabled" and "Enabled"
> and let the driver pick the PAL or NTSC version depending on the
> standard.

My problem was that I wanted make this independent of the standard that is
detected on the input. With S_STD and allowing to override the detected
standard, this can be implemented in a much better way.

> 
> > +
> > +static const char * const isl7998x_test_pattern_bars[] = {
> > +	"bbbbwb", "bbbwwb", "bbwbwb", "bbwwwb",
> > +};
> > +
> > +static const char * const isl7998x_test_pattern_colors[] = {
> > +	"Yellow", "Blue", "Green", "Pink",
> > +};
> > +
> > +struct isl7998x_mode {
> > +	unsigned int width;
> > +	unsigned int height;
> > +	enum v4l2_field field;
> > +};
> > +
> > +static const struct isl7998x_mode supported_modes[] = {
> > +	{
> > +		.width = 720,
> > +		.height = 576,
> > +		.field = V4L2_FIELD_SEQ_TB,
> > +	},
> > +	{
> > +		.width = 720,
> > +		.height = 480,
> > +		.field = V4L2_FIELD_SEQ_BT,
> > +	},
> > +};
> > +
> > +struct isl7998x {
> > +	struct v4l2_subdev		subdev;
> > +	struct regmap			*regmap;
> > +	struct gpio_desc		*pd_gpio;
> > +	struct gpio_desc		*rstb_gpio;
> > +	unsigned int			nr_mipi_lanes;
> > +	u32				nr_inputs;
> > +
> > +	const struct isl7998x_mode	*mode;
> > +	const struct isl7998x_datafmt	*fmt;
> > +	struct media_pad		pads[ISL7998x_NUM_PADS];
> > +
> > +	struct v4l2_ctrl_handler	ctrl_handler;
> > +	/* protect ctrl_handler */
> > +	struct mutex			ctrl_mutex;
> > +
> > +	/* V4L2 Controls */
> > +	struct v4l2_ctrl		*link_freq;
> > +	u8				test_pattern;
> > +	u8				test_pattern_bars;
> > +	u8				test_pattern_chans;
> > +	u8				test_pattern_color;
> > +};
> > +
> > +static struct isl7998x *sd_to_isl7998x(struct v4l2_subdev *sd)
> > +{
> > +	return container_of(sd, struct isl7998x, subdev);
> > +}
> > +
> > +static struct isl7998x *i2c_to_isl7998x(const struct i2c_client *client)
> > +{
> > +	return sd_to_isl7998x(i2c_get_clientdata(client));
> > +}
> > +
> > +static const struct isl7998x_mode *isl7998x_get_mode(struct isl7998x *isl7998x)
> > +{
> > +	switch (isl7998x->test_pattern) {
> > +	case 1:
> > +		return &supported_modes[0];
> > +	case 2:
> > +		return &supported_modes[1];
> > +	default:
> > +		return isl7998x->mode;
> > +	}
> > +}
> > +
> > +static int isl7998x_get_nr_inputs(struct device_node *of_node)
> > +{
> > +	struct device_node *port;
> > +	unsigned int inputs = 0;
> > +	unsigned int i;
> > +
> > +	if (of_graph_get_endpoint_count(of_node) > ISL7998x_NUM_PADS)
> > +		return -EINVAL;
> > +
> > +	/*
> > +	 * The driver does not provide means to remap the input ports. It
> > +	 * always configures input ports to start from VID1. Ensure that the
> > +	 * device tree is correct.
> > +	 */
> > +	for (i = ISL7998x_PAD_VIN1; i < ISL7998x_PAD_VIN4; i++) {
> > +		port = of_graph_get_port_by_id(of_node, i);
> > +		if (!port)
> > +			continue;
> > +
> > +		inputs |= BIT(i);
> > +		of_node_put(port);
> > +	}
> > +
> > +	switch (inputs) {
> > +	case BIT(ISL7998x_PAD_VIN1):
> > +		return 1;
> > +	case BIT(ISL7998x_PAD_VIN1) | BIT(ISL7998x_PAD_VIN2):
> > +		return 2;
> > +	case BIT(ISL7998x_PAD_VIN1) | BIT(ISL7998x_PAD_VIN2) |
> > +	     BIT(ISL7998x_PAD_VIN3) | BIT(ISL7998x_PAD_VIN4):
> > +		return 4;
> > +	default:
> > +		return -EINVAL;
> > +	}
> > +}
> > +
> > +static int isl7998x_wait_power_on(struct isl7998x *isl7998x)
> > +{
> > +	struct device *dev = isl7998x->subdev.dev;
> > +	u32 chip_id;
> > +	int ret;
> > +	int err;
> > +
> > +	ret = read_poll_timeout(regmap_read, err, !err, 2000, 20000, false,
> > +				isl7998x->regmap,
> > +				ISL7998x_REG_P0_PRODUCT_ID_CODE, &chip_id);
> > +	if (ret) {
> > +		dev_err(dev, "timeout while waiting for ISL7998x\n");
> > +		return ret;
> > +	}
> > +
> > +	dev_dbg(dev, "Found ISL799%x\n", chip_id);
> > +
> > +	return ret;
> > +}
> > +
> > +static int isl7998x_init(struct isl7998x *isl7998x)
> > +{
> > +	const unsigned int lanes = isl7998x->nr_mipi_lanes;
> > +	const u32 isl7998x_video_in_chan_map[] = { 0x00, 0x11, 0x02, 0x02 };
> > +	const struct reg_sequence isl7998x_init_seq_custom[] = {
> > +		{ ISL7998x_REG_P0_VIDEO_IN_CHAN_CTL,
> > +		  isl7998x_video_in_chan_map[isl7998x->nr_inputs - 1] },
> > +		{ ISL7998x_REG_P0_CLK_CTL_4,
> > +		  (lanes == 1) ? 0x40 : 0x41 },
> > +		{ ISL7998x_REG_P5_LI_ENGINE_CTL,
> > +		  (lanes == 1) ? 0x01 : 0x02 },
> > +		{ ISL7998x_REG_P5_LI_ENGINE_LINE_CTL,
> > +		  0x20 | ((isl7998x->mode->width >> 7) & 0x1f) },
> > +		{ ISL7998x_REG_P5_LI_ENGINE_PIC_WIDTH,
> > +		  (isl7998x->mode->width << 1) & 0xff },
> > +	};
> > +	struct device *dev = isl7998x->subdev.dev;
> > +	struct regmap *regmap = isl7998x->regmap;
> > +	int ret;
> > +
> > +	dev_dbg(dev, "configuring %d lanes for %d inputs (%dx%d)\n",
> > +		isl7998x->nr_mipi_lanes, isl7998x->nr_inputs,
> > +		isl7998x->mode->width, isl7998x->mode->height);
> > +
> > +	ret = regmap_register_patch(regmap, isl7998x_init_seq_1,
> > +				    ARRAY_SIZE(isl7998x_init_seq_1));
> > +	if (ret)
> > +		return ret;
> > +
> > +	ret = regmap_register_patch(regmap, isl7998x_init_seq_custom,
> > +				    ARRAY_SIZE(isl7998x_init_seq_custom));
> > +	if (ret)
> > +		return ret;
> > +
> > +	return regmap_register_patch(regmap, isl7998x_init_seq_2,
> > +				     ARRAY_SIZE(isl7998x_init_seq_2));
> > +}
> > +
> > +static const struct isl7998x_video_std {
> > +	int id;
> > +	const char *name;
> > +	const struct isl7998x_mode *mode;
> > +} isl7998x_std_res[] = {
> > +	{ 0, "NTSC (M)", &supported_modes[1]},
> > +	{ 1, "PAL (B, D, G, H, I)", &supported_modes[0]},
> > +	{ 2, "SECAM", &supported_modes[0]},
> > +	{ 3, "NTSC4.43", &supported_modes[1]},
> > +	{ 4, "PAL (M)", &supported_modes[1]},
> > +	{ 5, "PAL (CN)", &supported_modes[0]},
> > +	{ 6, "PAL 60", &supported_modes[1]},
> > +	{ 7, "N/A", NULL},
> > +};
> > +
> > +/*
> > + * Detect and set video standard on video inputs.
> > + */
> > +static int isl7998x_update_std(struct isl7998x *isl7998x)
> > +{
> > +#define ISL7998x_INPUTS			4
> > +	struct device *dev = isl7998x->subdev.dev;
> > +	unsigned int std_id[ISL7998x_INPUTS];
> > +	unsigned int i;
> > +	int ret;
> > +	u32 reg;
> > +
> > +	ret = pm_runtime_resume_and_get(dev);
> > +	if (ret)
> > +		return ret;
> > +
> > +	for (i = 0; i < ISL7998x_INPUTS; i++) {
> > +		ret = regmap_read_poll_timeout(isl7998x->regmap,
> > +				ISL7998x_REG_Px_DEC_SDT(i + 1),
> > +				reg, reg & ISL7998x_REG_Px_DEC_SDT_DET,
> > +				2000, 500 * USEC_PER_MSEC);
> > +		std_id[i] = FIELD_GET(ISL7998x_REG_Px_DEC_SDT_NOW, reg);
> 
> Hmm, what happens if there is no signal for this input? Does it pick a random
> standard? Or is it N/A?

In my tests, it always detected PAL (B, D, G, H, I), if there is no signal.
This isn't documented, but my guess is that this is the fallback, if nothing
is detected.

> 
> > +		if (ret)
> > +			goto out;
> > +	}
> > +
> > +	/*
> > +	 * According to Renesas FAE, all input cameras must have the
> > +	 * same standard on this chip.
> > +	 */
> > +	for (i = 0; i < isl7998x->nr_inputs; i++) {
> > +		dev_dbg(dev, "input %d: detected %s\n",
> > +			i, isl7998x_std_res[std_id[i]].name);
> > +		if (std_id[0] != std_id[i])
> > +			dev_warn(dev,
> > +				 "incompatible standards: %s on input %d (expected %s)\n",
> > +				 isl7998x_std_res[std_id[i]].name, i,
> > +				 isl7998x_std_res[std_id[0]].name);
> 
> It is probably fine if some of the inputs are N/A, as long as the others are
> a match.
> 
> > +	}
> > +
> > +	isl7998x->mode = isl7998x_std_res[std_id[0]].mode;
> 
> Nack. That's not how video receivers work. Everyone who writes a driver for a
> video receiver for the first time makes the same mistake...
> 
> The driver must support VIDIOC_SUBDEV_G/S_STD, ENUMSTD and QUERYSTD ioctls.
> To support VIDIOC_SUBDEV_ENUMSTD the driver must implement the g_tvnorms subdev op,
> which returns the mask of supported standards.
> 
> QUERYSTD will return the detected standard for all inputs. That is effectively
> isl7998x_update_std(), except without the actual updating of the mode part, i.e.
> it just detects and changes nothing.
> 
> If there are incompatible standards detected for different inputs, then you can
> either just pick one or return -ENODATA.
> 
> VIDIOC_SUBDEV_G_STD returns the currently selected standard (typically probe will
> initialize this to NTSC) and VIDIOC_SUBDEV_S_STD sets the standard.
> 
> The typical userspace usage is to call QUERYSTD first, then call S_STD with what
> QUERYSTD detected.
> 
> Setting a new standard will automatically change the width and height and reset
> any cropping. If streaming is in progress, then changing to a different standard
> (and thus resolution) is not allowed and S_STD must return -EBUSY.
> 
> You can't change the format to something different from the standard, unless there
> is a scaler, in which case the video is scaled to the requested format. So for
> video receivers S_FMT will typically just overwrite the width and height depending
> on the current standard.
> 
> Also implement the g_input_status subdev op to give feedback to userspace whether
> or not there is a signal.
> 
> If the hardware supports detecting signal (standard) changes through e.g. an interrupt,
> then you can raise the V4L2_EVENT_SOURCE_CHANGE event to tell userspace about this,
> but for some reason this is rarely present in video receivers.

Thanks for the clarification. This should actually be straightforward to
implement. I will do so in v7.

> 
> > +
> > +out:
> > +	pm_runtime_put(dev);
> > +
> > +	return ret;
> > +}
> > +
> > +static int isl7998x_set_test_pattern(struct isl7998x *isl7998x)
> > +{
> > +	const struct reg_sequence isl7998x_init_seq_tpg_off[] = {
> > +		{ ISL7998x_REG_P5_LI_ENGINE_TP_GEN_CTL, 0 },
> > +		{ ISL7998x_REG_P5_LI_ENGINE_CTL_2, 0 }
> > +	};
> > +	const struct reg_sequence isl7998x_init_seq_tpg_on[] = {
> > +		{ ISL7998x_REG_P5_TP_GEN_BAR_PATTERN,
> > +		  isl7998x->test_pattern_bars << 6 },
> > +		{ ISL7998x_REG_P5_LI_ENGINE_CTL_2,
> > +		  isl7998x->test_pattern == 1 ? BIT(2) : 0 },
> > +		{ ISL7998x_REG_P5_LI_ENGINE_TP_GEN_CTL,
> > +		  (isl7998x->test_pattern_chans << 4) |
> > +		  (isl7998x->test_pattern_color << 2) }
> > +	};
> > +	struct device *dev = isl7998x->subdev.dev;
> > +	struct regmap *regmap = isl7998x->regmap;
> > +	int ret;
> > +
> > +	if (!pm_runtime_enabled(dev) || !pm_runtime_get_if_in_use(dev))
> > +		return 0;
> > +
> > +	if (isl7998x->test_pattern != 0) {
> > +		dev_dbg(dev, "test pattern: %s, channels 0x%x, %s, %s\n",
> > +			isl7998x_test_pattern_menu[isl7998x->test_pattern],
> > +			isl7998x->test_pattern_chans,
> > +			isl7998x_test_pattern_bars[isl7998x->test_pattern_bars],
> > +			isl7998x_test_pattern_colors[isl7998x->test_pattern_color]);
> > +		ret = regmap_register_patch(regmap, isl7998x_init_seq_tpg_on,
> > +					    ARRAY_SIZE(isl7998x_init_seq_tpg_on));
> > +	} else {
> > +		ret = regmap_register_patch(regmap, isl7998x_init_seq_tpg_off,
> > +					    ARRAY_SIZE(isl7998x_init_seq_tpg_off));
> > +	}
> > +
> > +	pm_runtime_put(dev);
> > +
> > +	return ret;
> > +}
> > +
> > +#ifdef CONFIG_VIDEO_ADV_DEBUG
> > +static int isl7998x_g_register(struct v4l2_subdev *sd,
> > +			       struct v4l2_dbg_register *reg)
> > +{
> > +	struct isl7998x *isl7998x = sd_to_isl7998x(sd);
> > +	int ret;
> > +	u32 val;
> > +
> > +	ret = regmap_read(isl7998x->regmap, reg->reg, &val);
> > +	if (ret)
> > +		return ret;
> > +
> > +	reg->size = 1;
> > +	reg->val = val;
> > +
> > +	return 0;
> > +}
> > +
> > +static int isl7998x_s_register(struct v4l2_subdev *sd,
> > +			       const struct v4l2_dbg_register *reg)
> > +{
> > +	struct isl7998x *isl7998x = sd_to_isl7998x(sd);
> > +
> > +	return regmap_write(isl7998x->regmap, reg->reg, reg->val);
> > +}
> > +#endif
> > +
> > +static int isl7998x_s_stream(struct v4l2_subdev *sd, int enable)
> > +{
> > +	struct isl7998x *isl7998x = sd_to_isl7998x(sd);
> > +	struct i2c_client *client = v4l2_get_subdevdata(sd);
> > +	struct device *dev = &client->dev;
> > +	int ret = 0;
> > +	u32 reg;
> > +
> > +	dev_dbg(dev, "stream %s\n", enable ? "ON" : "OFF");
> > +
> > +	if (enable) {
> > +		ret = isl7998x_set_test_pattern(isl7998x);
> > +		if (ret)
> > +			return ret;
> > +	}
> > +
> > +	regmap_read(isl7998x->regmap,
> > +		    ISL7998x_REG_P5_LI_ENGINE_CTL, &reg);
> > +	if (enable)
> > +		reg &= ~BIT(7);
> > +	else
> > +		reg |= BIT(7);
> > +	ret = regmap_write(isl7998x->regmap,
> > +			   ISL7998x_REG_P5_LI_ENGINE_CTL, reg);
> > +
> > +	return ret;
> > +}
> > +
> > +static int isl7998x_pre_streamon(struct v4l2_subdev *sd, u32 flags)
> > +{
> > +	struct i2c_client *client = v4l2_get_subdevdata(sd);
> > +	struct device *dev = &client->dev;
> > +
> > +	if (flags & V4L2_SUBDEV_PRE_STREAMON_FL_MANUAL_LP)
> > +		return pm_runtime_resume_and_get(dev);
> > +
> > +	return 0;
> > +}
> > +
> > +static int isl7998x_post_streamoff(struct v4l2_subdev *sd)
> > +{
> > +	struct i2c_client *client = v4l2_get_subdevdata(sd);
> > +	struct device *dev = &client->dev;
> > +
> > +	pm_runtime_put(dev);
> > +
> > +	return 0;
> > +}
> > +
> > +static int isl7998x_enum_mbus_code(struct v4l2_subdev *sd,
> > +				   struct v4l2_subdev_state *sd_state,
> > +				   struct v4l2_subdev_mbus_code_enum *code)
> > +{
> > +	if (code->index >= ARRAY_SIZE(isl7998x_colour_fmts))
> > +		return -EINVAL;
> > +
> > +	code->code = isl7998x_colour_fmts[code->index].code;
> > +
> > +	return 0;
> > +}
> > +
> > +static int isl7998x_enum_frame_size(struct v4l2_subdev *sd,
> > +				    struct v4l2_subdev_state *sd_state,
> > +				    struct v4l2_subdev_frame_size_enum *fse)
> > +{
> > +	if (fse->index >= ARRAY_SIZE(supported_modes))
> > +		return -EINVAL;
> > +
> > +	if (fse->code != isl7998x_colour_fmts[0].code)
> > +		return -EINVAL;
> > +
> > +	fse->min_width = supported_modes[fse->index].width;
> > +	fse->max_width = fse->min_width;
> > +	fse->min_height = supported_modes[fse->index].height;
> > +	fse->max_height = fse->min_height;
> > +
> > +	return 0;
> > +}
> > +
> > +static int isl7998x_get_fmt(struct v4l2_subdev *sd,
> > +			    struct v4l2_subdev_state *sd_state,
> > +			    struct v4l2_subdev_format *format)
> > +{
> > +	struct isl7998x *isl7998x = sd_to_isl7998x(sd);
> > +	struct v4l2_mbus_framefmt *mf = &format->format;
> > +	const struct isl7998x_mode *mode = isl7998x_get_mode(isl7998x);
> > +
> > +	if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
> > +		format->format = *v4l2_subdev_get_try_format(sd, sd_state,
> > +							     format->pad);
> > +		return 0;
> > +	}
> > +
> > +	mf->width	= mode->width;
> > +	mf->height	= mode->height;
> > +	mf->code	= isl7998x->fmt->code;
> > +	mf->field	= mode->field;
> > +	mf->colorspace	= 0;
> > +
> > +	return 0;
> > +}
> > +
> > +static int isl7998x_set_fmt(struct v4l2_subdev *sd,
> > +			    struct v4l2_subdev_state *sd_state,
> > +			    struct v4l2_subdev_format *format)
> > +{
> > +	struct isl7998x *isl7998x = sd_to_isl7998x(sd);
> > +	struct v4l2_mbus_framefmt *mf = &format->format;
> > +	const struct isl7998x_mode *mode = isl7998x_get_mode(isl7998x);
> > +
> > +	mf->width = mode->width;
> > +	mf->height = mode->height;
> > +	mf->code = isl7998x->fmt->code;
> > +	mf->field = mode->field;
> > +
> > +	if (format->which == V4L2_SUBDEV_FORMAT_TRY)
> > +		*v4l2_subdev_get_try_format(sd, sd_state, format->pad) = format->format;
> > +
> > +	return 0;
> > +}
> > +
> > +static int isl7998x_set_ctrl(struct v4l2_ctrl *ctrl)
> > +{
> > +	struct isl7998x *isl7998x = container_of(ctrl->handler,
> > +						 struct isl7998x, ctrl_handler);
> > +
> > +	switch (ctrl->id) {
> > +	case V4L2_CID_TEST_PATTERN_BARS:
> > +		isl7998x->test_pattern_bars = ctrl->val & 0x3;
> > +		return isl7998x_set_test_pattern(isl7998x);
> > +	case V4L2_CID_TEST_PATTERN_CHANNELS:
> > +		isl7998x->test_pattern_chans = ctrl->val & 0xf;
> > +		return isl7998x_set_test_pattern(isl7998x);
> > +	case V4L2_CID_TEST_PATTERN_COLOR:
> > +		isl7998x->test_pattern_color = ctrl->val & 0x3;
> > +		return isl7998x_set_test_pattern(isl7998x);
> > +	case V4L2_CID_TEST_PATTERN:
> > +		isl7998x->test_pattern = ctrl->val;
> > +		return isl7998x_set_test_pattern(isl7998x);
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +static const struct v4l2_subdev_core_ops isl7998x_subdev_core_ops = {
> > +#ifdef CONFIG_VIDEO_ADV_DEBUG
> > +	.g_register	= isl7998x_g_register,
> > +	.s_register	= isl7998x_s_register,
> > +#endif
> > +};
> > +
> > +static const struct v4l2_subdev_video_ops isl7998x_subdev_video_ops = {
> > +	.s_stream	= isl7998x_s_stream,
> > +	.pre_streamon	= isl7998x_pre_streamon,
> > +	.post_streamoff	= isl7998x_post_streamoff,
> > +};
> > +
> > +static const struct v4l2_subdev_pad_ops isl7998x_subdev_pad_ops = {
> > +	.enum_mbus_code		= isl7998x_enum_mbus_code,
> > +	.enum_frame_size	= isl7998x_enum_frame_size,
> > +	.get_fmt		= isl7998x_get_fmt,
> > +	.set_fmt		= isl7998x_set_fmt,
> > +};
> > +
> > +static const struct v4l2_subdev_ops isl7998x_subdev_ops = {
> > +	.core		= &isl7998x_subdev_core_ops,
> > +	.video		= &isl7998x_subdev_video_ops,
> > +	.pad		= &isl7998x_subdev_pad_ops,
> > +};
> > +
> > +static const struct media_entity_operations isl7998x_entity_ops = {
> > +	.link_validate = v4l2_subdev_link_validate,
> > +};
> > +
> > +static const struct v4l2_ctrl_ops isl7998x_ctrl_ops = {
> > +	.s_ctrl			= isl7998x_set_ctrl,
> > +};
> > +
> > +static const struct v4l2_ctrl_config isl7998x_ctrls[] = {
> > +	{
> > +		.ops		= &isl7998x_ctrl_ops,
> > +		.id		= V4L2_CID_TEST_PATTERN_BARS,
> > +		.type		= V4L2_CTRL_TYPE_MENU,
> > +		.name		= "Test Pattern Bars",
> > +		.max		= ARRAY_SIZE(isl7998x_test_pattern_bars) - 1,
> > +		.def		= 0,
> > +		.qmenu		= isl7998x_test_pattern_bars,
> > +	}, {
> > +		.ops		= &isl7998x_ctrl_ops,
> > +		.id		= V4L2_CID_TEST_PATTERN_CHANNELS,
> > +		.type		= V4L2_CTRL_TYPE_INTEGER,
> > +		.name		= "Test Pattern Channels",
> > +		.min		= 0,
> > +		.max		= 0xf,
> > +		.step		= 1,
> > +		.def		= 0xf,
> > +		.flags		= 0,
> > +	}, {
> > +		.ops		= &isl7998x_ctrl_ops,
> > +		.id		= V4L2_CID_TEST_PATTERN_COLOR,
> > +		.type		= V4L2_CTRL_TYPE_MENU,
> > +		.name		= "Test Pattern Color",
> > +		.max		= ARRAY_SIZE(isl7998x_test_pattern_colors) - 1,
> > +		.def		= 0,
> > +		.qmenu		= isl7998x_test_pattern_colors,
> > +	},
> 
> How exactly do these interact? How does it work precisely?

The TEST_PATTERN_CHANNELS has a bit for each of the four decoders of this
chip. This switches the connected MIPI CSI-2 virtual channel from the video
input to the test pattern.

The test pattern consists mostly of rectangles in various shades of gray. On
the top, there is a colored bar. The color of the bar can be adjusted using
the TEST_PATTERN_COLOR control. In the top left corner, there is a field with
a pattern of black and white vertical bars. This pattern can be changed using
the TEST_PATTERN_BARS control.

Should I document this somewhere and, if yes, where?

Michael

> 
> Regards,
> 
> 	Hans
> 
> > +};
> > +
> > +#define ISL7998x_REG_DECODER_ACA_READABLE_RANGE(page)			\
> > +	/* Decoder range */						\
> > +	regmap_reg_range(ISL7998x_REG_Px_DEC_INPUT_FMT(page),		\
> > +			 ISL7998x_REG_Px_DEC_HS_DELAY_CTL(page)),	\
> > +	regmap_reg_range(ISL7998x_REG_Px_DEC_ANCTL(page),		\
> > +			 ISL7998x_REG_Px_DEC_CSC_CTL(page)),		\
> > +	regmap_reg_range(ISL7998x_REG_Px_DEC_BRIGHT(page),		\
> > +			 ISL7998x_REG_Px_DEC_HUE(page)),		\
> > +	regmap_reg_range(ISL7998x_REG_Px_DEC_VERT_PEAK(page),		\
> > +			 ISL7998x_REG_Px_DEC_CORING(page)),		\
> > +	regmap_reg_range(ISL7998x_REG_Px_DEC_SDT(page),			\
> > +			 ISL7998x_REG_Px_DEC_SDTR(page)),		\
> > +	regmap_reg_range(ISL7998x_REG_Px_DEC_CLMPG(page),		\
> > +			 ISL7998x_REG_Px_DEC_DATA_CONV(page)),		\
> > +	regmap_reg_range(ISL7998x_REG_Px_DEC_INTERNAL_TEST(page),	\
> > +			 ISL7998x_REG_Px_DEC_INTERNAL_TEST(page)),	\
> > +	regmap_reg_range(ISL7998x_REG_Px_DEC_H_DELAY_CTL(page),		\
> > +			 ISL7998x_REG_Px_DEC_H_DELAY_II_LOW(page)),	\
> > +	/* ACA range */							\
> > +	regmap_reg_range(ISL7998x_REG_Px_ACA_CTL_1(page),		\
> > +			 ISL7998x_REG_Px_ACA_HIST_WIN_V_SZ2(page)),	\
> > +	regmap_reg_range(ISL7998x_REG_Px_ACA_Y_AVG(page),		\
> > +			 ISL7998x_REG_Px_ACA_CTL_4(page)),		\
> > +	regmap_reg_range(ISL7998x_REG_Px_ACA_FLEX_WIN_HIST(page),	\
> > +			 ISL7998x_REG_Px_ACA_XFER_HIST_HOST(page)),	\
> > +	regmap_reg_range(ISL7998x_REG_Px_DEC_PAGE(page),		\
> > +			 ISL7998x_REG_Px_DEC_PAGE(page))
> > +
> > +#define ISL7998x_REG_DECODER_ACA_WRITEABLE_RANGE(page)			\
> > +	/* Decoder range */						\
> > +	regmap_reg_range(ISL7998x_REG_Px_DEC_INPUT_FMT(page),		\
> > +			 ISL7998x_REG_Px_DEC_INPUT_FMT(page)),		\
> > +	regmap_reg_range(ISL7998x_REG_Px_DEC_HS_DELAY_CTL(page),	\
> > +			 ISL7998x_REG_Px_DEC_HS_DELAY_CTL(page)),	\
> > +	regmap_reg_range(ISL7998x_REG_Px_DEC_ANCTL(page),		\
> > +			 ISL7998x_REG_Px_DEC_CSC_CTL(page)),		\
> > +	regmap_reg_range(ISL7998x_REG_Px_DEC_BRIGHT(page),		\
> > +			 ISL7998x_REG_Px_DEC_HUE(page)),		\
> > +	regmap_reg_range(ISL7998x_REG_Px_DEC_VERT_PEAK(page),		\
> > +			 ISL7998x_REG_Px_DEC_CORING(page)),		\
> > +	regmap_reg_range(ISL7998x_REG_Px_DEC_SDT(page),			\
> > +			 ISL7998x_REG_Px_DEC_SDTR(page)),		\
> > +	regmap_reg_range(ISL7998x_REG_Px_DEC_CLMPG(page),		\
> > +			 ISL7998x_REG_Px_DEC_MISC3(page)),		\
> > +	regmap_reg_range(ISL7998x_REG_Px_DEC_CLMD(page),		\
> > +			 ISL7998x_REG_Px_DEC_DATA_CONV(page)),		\
> > +	regmap_reg_range(ISL7998x_REG_Px_DEC_INTERNAL_TEST(page),	\
> > +			 ISL7998x_REG_Px_DEC_INTERNAL_TEST(page)),	\
> > +	regmap_reg_range(ISL7998x_REG_Px_DEC_H_DELAY_CTL(page),		\
> > +			 ISL7998x_REG_Px_DEC_H_DELAY_II_LOW(page)),	\
> > +	/* ACA range */							\
> > +	regmap_reg_range(ISL7998x_REG_Px_ACA_CTL_1(page),		\
> > +			 ISL7998x_REG_Px_ACA_HIST_WIN_V_SZ2(page)),	\
> > +	regmap_reg_range(ISL7998x_REG_Px_ACA_CTL_2(page),		\
> > +			 ISL7998x_REG_Px_ACA_CTL_4(page)),		\
> > +	regmap_reg_range(ISL7998x_REG_Px_ACA_FLEX_WIN_HIST(page),	\
> > +			 ISL7998x_REG_Px_ACA_HIST_DATA_LO(page)),	\
> > +	regmap_reg_range(ISL7998x_REG_Px_ACA_XFER_HIST_HOST(page),	\
> > +			 ISL7998x_REG_Px_ACA_XFER_HIST_HOST(page)),	\
> > +	regmap_reg_range(ISL7998x_REG_Px_DEC_PAGE(page),		\
> > +			 ISL7998x_REG_Px_DEC_PAGE(page))
> > +
> > +#define ISL7998x_REG_DECODER_ACA_VOLATILE_RANGE(page)			\
> > +	/* Decoder range */						\
> > +	regmap_reg_range(ISL7998x_REG_Px_DEC_STATUS_1(page),		\
> > +			 ISL7998x_REG_Px_DEC_STATUS_1(page)),		\
> > +	regmap_reg_range(ISL7998x_REG_Px_DEC_SDT(page),			\
> > +			 ISL7998x_REG_Px_DEC_SDT(page)),		\
> > +	regmap_reg_range(ISL7998x_REG_Px_DEC_MVSN(page),		\
> > +			 ISL7998x_REG_Px_DEC_HFREF(page)),		\
> > +	/* ACA range */							\
> > +	regmap_reg_range(ISL7998x_REG_Px_ACA_Y_AVG(page),		\
> > +			 ISL7998x_REG_Px_ACA_Y_HIGH(page)),		\
> > +	regmap_reg_range(ISL7998x_REG_Px_ACA_HIST_DATA_LO(page),	\
> > +			 ISL7998x_REG_Px_ACA_FLEX_WIN_CR_CLR(page))
> > +
> > +static const struct regmap_range isl7998x_readable_ranges[] = {
> > +	regmap_reg_range(ISL7998x_REG_P0_PRODUCT_ID_CODE,
> > +			 ISL7998x_REG_P0_IRQ_SYNC_CTL),
> > +	regmap_reg_range(ISL7998x_REG_P0_INTERRUPT_STATUS,
> > +			 ISL7998x_REG_P0_CLOCK_DELAY),
> > +	regmap_reg_range(ISL7998x_REG_Px_DEC_PAGE(0),
> > +			 ISL7998x_REG_Px_DEC_PAGE(0)),
> > +
> > +	ISL7998x_REG_DECODER_ACA_READABLE_RANGE(1),
> > +	ISL7998x_REG_DECODER_ACA_READABLE_RANGE(2),
> > +	ISL7998x_REG_DECODER_ACA_READABLE_RANGE(3),
> > +	ISL7998x_REG_DECODER_ACA_READABLE_RANGE(4),
> > +
> > +	regmap_reg_range(ISL7998x_REG_P5_LI_ENGINE_CTL,
> > +			 ISL7998x_REG_P5_MIPI_SP_HS_TRL_CTL),
> > +	regmap_reg_range(ISL7998x_REG_P5_FIFO_THRSH_CNT_1,
> > +			 ISL7998x_REG_P5_PLL_ANA),
> > +	regmap_reg_range(ISL7998x_REG_P5_TOTAL_PF_LINE_CNT_1,
> > +			 ISL7998x_REG_P5_HIST_LINE_CNT_2),
> > +	regmap_reg_range(ISL7998x_REG_Px_DEC_PAGE(5),
> > +			 ISL7998x_REG_Px_DEC_PAGE(5)),
> > +};
> > +
> > +static const struct regmap_range isl7998x_writeable_ranges[] = {
> > +	regmap_reg_range(ISL7998x_REG_P0_SW_RESET_CTL,
> > +			 ISL7998x_REG_P0_IRQ_SYNC_CTL),
> > +	regmap_reg_range(ISL7998x_REG_P0_CHAN_1_IRQ,
> > +			 ISL7998x_REG_P0_SHORT_DIAG_IRQ_EN),
> > +	regmap_reg_range(ISL7998x_REG_P0_CLOCK_DELAY,
> > +			 ISL7998x_REG_P0_CLOCK_DELAY),
> > +	regmap_reg_range(ISL7998x_REG_Px_DEC_PAGE(0),
> > +			 ISL7998x_REG_Px_DEC_PAGE(0)),
> > +
> > +	ISL7998x_REG_DECODER_ACA_WRITEABLE_RANGE(1),
> > +	ISL7998x_REG_DECODER_ACA_WRITEABLE_RANGE(2),
> > +	ISL7998x_REG_DECODER_ACA_WRITEABLE_RANGE(3),
> > +	ISL7998x_REG_DECODER_ACA_WRITEABLE_RANGE(4),
> > +
> > +	regmap_reg_range(ISL7998x_REG_P5_LI_ENGINE_CTL,
> > +			 ISL7998x_REG_P5_ESC_MODE_TIME_CTL),
> > +	regmap_reg_range(ISL7998x_REG_P5_MIPI_SP_HS_TRL_CTL,
> > +			 ISL7998x_REG_P5_PLL_ANA),
> > +	regmap_reg_range(ISL7998x_REG_P5_TOTAL_PF_LINE_CNT_1,
> > +			 ISL7998x_REG_P5_HIST_LINE_CNT_2),
> > +	regmap_reg_range(ISL7998x_REG_Px_DEC_PAGE(5),
> > +			 ISL7998x_REG_Px_DEC_PAGE(5)),
> > +
> > +	ISL7998x_REG_DECODER_ACA_WRITEABLE_RANGE(0xf),
> > +};
> > +
> > +static const struct regmap_range isl7998x_volatile_ranges[] = {
> > +	/* Product id code register is used to check availability */
> > +	regmap_reg_range(ISL7998x_REG_P0_PRODUCT_ID_CODE,
> > +			 ISL7998x_REG_P0_PRODUCT_ID_CODE),
> > +	regmap_reg_range(ISL7998x_REG_P0_MPP1_SYNC_CTL,
> > +			 ISL7998x_REG_P0_IRQ_SYNC_CTL),
> > +	regmap_reg_range(ISL7998x_REG_P0_INTERRUPT_STATUS,
> > +			 ISL7998x_REG_P0_INTERRUPT_STATUS),
> > +	regmap_reg_range(ISL7998x_REG_P0_CHAN_1_STATUS,
> > +			 ISL7998x_REG_P0_SHORT_DIAG_STATUS),
> > +
> > +	ISL7998x_REG_DECODER_ACA_VOLATILE_RANGE(1),
> > +	ISL7998x_REG_DECODER_ACA_VOLATILE_RANGE(2),
> > +	ISL7998x_REG_DECODER_ACA_VOLATILE_RANGE(3),
> > +	ISL7998x_REG_DECODER_ACA_VOLATILE_RANGE(4),
> > +
> > +	regmap_reg_range(ISL7998x_REG_P5_AUTO_TEST_ERR_DET,
> > +			 ISL7998x_REG_P5_PIC_HEIGHT_LOW),
> > +};
> > +
> > +static const struct regmap_access_table isl7998x_readable_table = {
> > +	.yes_ranges = isl7998x_readable_ranges,
> > +	.n_yes_ranges = ARRAY_SIZE(isl7998x_readable_ranges),
> > +};
> > +
> > +static const struct regmap_access_table isl7998x_writeable_table = {
> > +	.yes_ranges = isl7998x_writeable_ranges,
> > +	.n_yes_ranges = ARRAY_SIZE(isl7998x_writeable_ranges),
> > +};
> > +
> > +static const struct regmap_access_table isl7998x_volatile_table = {
> > +	.yes_ranges = isl7998x_volatile_ranges,
> > +	.n_yes_ranges = ARRAY_SIZE(isl7998x_volatile_ranges),
> > +};
> > +
> > +static const struct regmap_range_cfg isl7998x_ranges[] = {
> > +	{
> > +		.range_min	= ISL7998x_REG_Pn_BASE(0),
> > +		.range_max	= ISL7998x_REG_Px_ACA_XFER_HIST_HOST(0xf),
> > +		.selector_reg	= ISL7998x_REG_Px_DEC_PAGE(0),
> > +		.selector_mask	= ISL7998x_REG_Px_DEC_PAGE_MASK,
> > +		.window_start	= 0,
> > +		.window_len	= 256,
> > +	}
> > +};
> > +
> > +static const struct regmap_config isl7998x_regmap = {
> > +	.reg_bits	= 8,
> > +	.val_bits	= 8,
> > +	.max_register	= ISL7998x_REG_Px_ACA_XFER_HIST_HOST(0xf),
> > +	.ranges		= isl7998x_ranges,
> > +	.num_ranges	= ARRAY_SIZE(isl7998x_ranges),
> > +	.rd_table	= &isl7998x_readable_table,
> > +	.wr_table	= &isl7998x_writeable_table,
> > +	.volatile_table	= &isl7998x_volatile_table,
> > +	.cache_type	= REGCACHE_RBTREE,
> > +};
> > +
> > +static int isl7998x_mc_init(struct isl7998x *isl7998x)
> > +{
> > +	unsigned int i;
> > +
> > +	isl7998x->subdev.entity.ops = &isl7998x_entity_ops;
> > +	isl7998x->subdev.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
> > +
> > +	isl7998x->pads[ISL7998x_PAD_OUT].flags = MEDIA_PAD_FL_SOURCE;
> > +	for (i = ISL7998x_PAD_VIN1; i < ISL7998x_NUM_PADS; i++)
> > +		isl7998x->pads[i].flags = MEDIA_PAD_FL_SINK;
> > +
> > +	return media_entity_pads_init(&isl7998x->subdev.entity,
> > +				      ISL7998x_NUM_PADS,
> > +				      isl7998x->pads);
> > +}
> > +
> > +static int get_link_freq_menu_index(unsigned int lanes,
> > +				    unsigned int inputs)
> > +{
> > +	int ret = -EINVAL;
> > +
> > +	switch (lanes) {
> > +	case 1:
> > +		if (inputs == 1)
> > +			ret = 0;
> > +		if (inputs == 2)
> > +			ret = 1;
> > +		if (inputs == 4)
> > +			ret = 2;
> > +		break;
> > +	case 2:
> > +		if (inputs == 2)
> > +			ret = 0;
> > +		if (inputs == 4)
> > +			ret = 1;
> > +		break;
> > +	default:
> > +		break;
> > +	}
> > +
> > +	return ret;
> > +}
> > +
> > +static int isl7998x_init_controls(struct isl7998x *isl7998x)
> > +{
> > +	struct v4l2_subdev *sd = &isl7998x->subdev;
> > +	int link_freq_index;
> > +	unsigned int i;
> > +	int ret;
> > +
> > +	ret = v4l2_ctrl_handler_init(&isl7998x->ctrl_handler,
> > +				     2 + ARRAY_SIZE(isl7998x_ctrls));
> > +	if (ret)
> > +		return ret;
> > +
> > +	mutex_init(&isl7998x->ctrl_mutex);
> > +	isl7998x->ctrl_handler.lock = &isl7998x->ctrl_mutex;
> > +	link_freq_index = get_link_freq_menu_index(isl7998x->nr_mipi_lanes,
> > +						   isl7998x->nr_inputs);
> > +	if (link_freq_index < 0 ||
> > +	    link_freq_index >= ARRAY_SIZE(link_freq_menu_items)) {
> > +		dev_err(sd->dev,
> > +			"failed to find MIPI link freq: %d lanes, %d inputs\n",
> > +			isl7998x->nr_mipi_lanes, isl7998x->nr_inputs);
> > +		ret = -EINVAL;
> > +		goto err;
> > +	}
> > +
> > +	isl7998x->link_freq = v4l2_ctrl_new_int_menu(&isl7998x->ctrl_handler,
> > +						     &isl7998x_ctrl_ops,
> > +						     V4L2_CID_LINK_FREQ,
> > +						     ARRAY_SIZE(link_freq_menu_items) - 1,
> > +						     link_freq_index,
> > +						     link_freq_menu_items);
> > +	if (isl7998x->link_freq)
> > +		isl7998x->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;
> > +
> > +	for (i = 0; i < ARRAY_SIZE(isl7998x_ctrls); i++)
> > +		v4l2_ctrl_new_custom(&isl7998x->ctrl_handler,
> > +				     &isl7998x_ctrls[i], NULL);
> > +
> > +	v4l2_ctrl_new_std_menu_items(&isl7998x->ctrl_handler,
> > +				     &isl7998x_ctrl_ops,
> > +				     V4L2_CID_TEST_PATTERN,
> > +				     ARRAY_SIZE(isl7998x_test_pattern_menu) - 1,
> > +				     0, 0, isl7998x_test_pattern_menu);
> > +
> > +	ret = isl7998x->ctrl_handler.error;
> > +	if (ret)
> > +		goto err;
> > +
> > +	isl7998x->subdev.ctrl_handler = &isl7998x->ctrl_handler;
> > +	v4l2_ctrl_handler_setup(&isl7998x->ctrl_handler);
> > +
> > +	return 0;
> > +
> > +err:
> > +	mutex_destroy(&isl7998x->ctrl_mutex);
> > +
> > +	return ret;
> > +}
> > +
> > +static void isl7998x_remove_controls(struct isl7998x *isl7998x)
> > +{
> > +	v4l2_ctrl_handler_free(isl7998x->subdev.ctrl_handler);
> > +	mutex_destroy(&isl7998x->ctrl_mutex);
> > +}
> > +
> > +static int isl7998x_probe(struct i2c_client *client)
> > +{
> > +	struct device *dev = &client->dev;
> > +	struct v4l2_fwnode_endpoint endpoint = {
> > +		.bus_type = V4L2_MBUS_CSI2_DPHY,
> > +	};
> > +	struct fwnode_handle *ep;
> > +	struct isl7998x *isl7998x;
> > +	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
> > +	int nr_inputs;
> > +	int ret;
> > +
> > +	ret = i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA);
> > +	if (!ret) {
> > +		dev_warn(&adapter->dev,
> > +			 "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
> > +		return -EIO;
> > +	}
> > +
> > +	isl7998x = devm_kzalloc(dev, sizeof(*isl7998x), GFP_KERNEL);
> > +	if (!isl7998x)
> > +		return -ENOMEM;
> > +
> > +	isl7998x->pd_gpio = devm_gpiod_get_optional(dev, "powerdown",
> > +						    GPIOD_OUT_HIGH);
> > +	if (IS_ERR(isl7998x->pd_gpio))
> > +		return dev_err_probe(dev, PTR_ERR(isl7998x->pd_gpio),
> > +				     "Failed to retrieve/request PD GPIO\n");
> > +
> > +	isl7998x->rstb_gpio = devm_gpiod_get_optional(dev, "reset",
> > +						      GPIOD_OUT_HIGH);
> > +	if (IS_ERR(isl7998x->rstb_gpio))
> > +		return dev_err_probe(dev, PTR_ERR(isl7998x->rstb_gpio),
> > +				     "Failed to retrieve/request RSTB GPIO\n");
> > +
> > +	isl7998x->regmap = devm_regmap_init_i2c(client, &isl7998x_regmap);
> > +	if (IS_ERR(isl7998x->regmap))
> > +		return dev_err_probe(dev, PTR_ERR(isl7998x->regmap),
> > +				     "Failed to allocate register map\n");
> > +
> > +	ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev),
> > +					     ISL7998x_PAD_OUT, 0, 0);
> > +	if (!ep)
> > +		return dev_err_probe(dev, -EINVAL, "Missing endpoint node\n");
> > +
> > +	ret = v4l2_fwnode_endpoint_parse(ep, &endpoint);
> > +	fwnode_handle_put(ep);
> > +	if (ret)
> > +		return dev_err_probe(dev, ret, "Failed to parse endpoint\n");
> > +
> > +	if (endpoint.bus.mipi_csi2.num_data_lanes == 0 ||
> > +	    endpoint.bus.mipi_csi2.num_data_lanes > 2)
> > +		return dev_err_probe(dev, -EINVAL,
> > +				     "Invalid number of MIPI lanes\n");
> > +
> > +	isl7998x->nr_mipi_lanes = endpoint.bus.mipi_csi2.num_data_lanes;
> > +
> > +	nr_inputs = isl7998x_get_nr_inputs(dev->of_node);
> > +	if (nr_inputs < 0)
> > +		return dev_err_probe(dev, nr_inputs,
> > +				     "Invalid number of input ports\n");
> > +	isl7998x->nr_inputs = nr_inputs;
> > +
> > +	v4l2_i2c_subdev_init(&isl7998x->subdev, client, &isl7998x_subdev_ops);
> > +	isl7998x->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> > +
> > +	ret = isl7998x_mc_init(isl7998x);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	isl7998x->mode = &supported_modes[0];
> > +	isl7998x->fmt = &isl7998x_colour_fmts[0];
> > +
> > +	ret = isl7998x_init_controls(isl7998x);
> > +	if (ret)
> > +		goto err_entity_cleanup;
> > +
> > +	ret = v4l2_async_register_subdev(&isl7998x->subdev);
> > +	if (ret < 0)
> > +		goto err_controls_cleanup;
> > +
> > +	pm_runtime_enable(dev);
> > +
> > +	ret = isl7998x_update_std(isl7998x);
> > +	if (ret)
> > +		goto err_init_cleanup;
> > +
> > +	return 0;
> > +
> > +err_init_cleanup:
> > +	pm_runtime_disable(dev);
> > +	v4l2_async_unregister_subdev(&isl7998x->subdev);
> > +err_controls_cleanup:
> > +	isl7998x_remove_controls(isl7998x);
> > +err_entity_cleanup:
> > +	media_entity_cleanup(&isl7998x->subdev.entity);
> > +
> > +	return ret;
> > +}
> > +
> > +static int isl7998x_remove(struct i2c_client *client)
> > +{
> > +	struct isl7998x *isl7998x = i2c_to_isl7998x(client);
> > +
> > +	pm_runtime_disable(&client->dev);
> > +	v4l2_async_unregister_subdev(&isl7998x->subdev);
> > +	isl7998x_remove_controls(isl7998x);
> > +	media_entity_cleanup(&isl7998x->subdev.entity);
> > +
> > +	return 0;
> > +}
> > +
> > +static const struct of_device_id isl7998x_of_match[] = {
> > +	{ .compatible = "isil,isl79987", },
> > +	{ /* sentinel */ },
> > +};
> > +MODULE_DEVICE_TABLE(of, isl7998x_of_match);
> > +
> > +static const struct i2c_device_id isl7998x_id[] = {
> > +	{ "isl79987", 0 },
> > +	{ /* sentinel */ },
> > +};
> > +MODULE_DEVICE_TABLE(i2c, isl7998x_id);
> > +
> > +static int __maybe_unused isl7998x_runtime_resume(struct device *dev)
> > +{
> > +	struct v4l2_subdev *sd = dev_get_drvdata(dev);
> > +	struct isl7998x *isl7998x = sd_to_isl7998x(sd);
> > +	int ret;
> > +
> > +	gpiod_set_value(isl7998x->rstb_gpio, 1);
> > +	gpiod_set_value(isl7998x->pd_gpio, 0);
> > +	gpiod_set_value(isl7998x->rstb_gpio, 0);
> > +
> > +	ret = isl7998x_wait_power_on(isl7998x);
> > +	if (ret)
> > +		goto err;
> > +
> > +	return isl7998x_init(isl7998x);
> > +
> > +err:
> > +	gpiod_set_value(isl7998x->pd_gpio, 1);
> > +
> > +	return ret;
> > +}
> > +
> > +static int __maybe_unused isl7998x_runtime_suspend(struct device *dev)
> > +{
> > +	struct v4l2_subdev *sd = dev_get_drvdata(dev);
> > +	struct isl7998x *isl7998x = sd_to_isl7998x(sd);
> > +
> > +	gpiod_set_value(isl7998x->pd_gpio, 1);
> > +
> > +	return 0;
> > +}
> > +
> > +static const struct dev_pm_ops isl7998x_pm_ops = {
> > +	SET_RUNTIME_PM_OPS(isl7998x_runtime_suspend,
> > +			   isl7998x_runtime_resume,
> > +			   NULL)
> > +};
> > +
> > +static struct i2c_driver isl7998x_i2c_driver = {
> > +	.driver = {
> > +		.name = "isl7998x",
> > +		.of_match_table = of_match_ptr(isl7998x_of_match),
> > +		.pm = &isl7998x_pm_ops,
> > +	},
> > +	.probe_new	= isl7998x_probe,
> > +	.remove		= isl7998x_remove,
> > +	.id_table	= isl7998x_id,
> > +};
> > +
> > +module_i2c_driver(isl7998x_i2c_driver);
> > +
> > +MODULE_DESCRIPTION("Intersil ISL7998x Analog to MIPI CSI-2/BT656 decoder");
> > +MODULE_AUTHOR("Marek Vasut <[e-mail]>");
> > +MODULE_LICENSE("GPL v2");
> > 
> 
>

Patch

diff --git a/MAINTAINERS b/MAINTAINERS
index ee91c5472bc1..60449758d40b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9739,6 +9739,14 @@  L:	[e-mail]
 F:	Documentation/devicetree/bindings/counter/interrupt-counter.yaml
 F:	drivers/counter/interrupt-cnt.c
 
+INTERSIL ISL7998X VIDEO DECODER DRIVER
+M:	Michael Tretter <[e-mail]>
+R:	Pengutronix Kernel Team <[e-mail]>
+L:	[e-mail]
+S:	Maintained
+F:	Documentation/devicetree/bindings/media/i2c/isil,isl79987.yaml
+F:	drivers/media/i2c/isl7998x.c
+
 INVENSENSE ICM-426xx IMU DRIVER
 M:	Jean-Baptiste Maneyrol <[e-mail]>
 L:	[e-mail]
diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index adb348aa8396..cb8f14504223 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -325,6 +325,16 @@  config VIDEO_BT866
 	  To compile this driver as a module, choose M here: the
 	  module will be called bt866.
 
+config VIDEO_ISL7998X
+	tristate "Intersil ISL7998x video decoder"
+	depends on VIDEO_V4L2 && I2C
+	depends on OF_GPIO
+	select MEDIA_CONTROLLER
+	select VIDEO_V4L2_SUBDEV_API
+	help
+	  Support for Intersil ISL7998x analog to MIPI-CSI2 or
+	  BT.656 decoder.
+
 config VIDEO_KS0127
 	tristate "KS0127 video decoder"
 	depends on VIDEO_V4L2 && I2C
diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
index 5ac8d639e5ca..78d692e4bb8f 100644
--- a/drivers/media/i2c/Makefile
+++ b/drivers/media/i2c/Makefile
@@ -129,6 +129,7 @@  obj-$(CONFIG_VIDEO_IMX334)	+= imx334.o
 obj-$(CONFIG_VIDEO_IMX335)	+= imx335.o
 obj-$(CONFIG_VIDEO_IMX355)	+= imx355.o
 obj-$(CONFIG_VIDEO_IMX412)	+= imx412.o
+obj-$(CONFIG_VIDEO_ISL7998X)	+= isl7998x.o
 obj-$(CONFIG_VIDEO_MAX9286)	+= max9286.o
 obj-$(CONFIG_VIDEO_MAX9271_LIB)	+= max9271.o
 obj-$(CONFIG_VIDEO_RDACM20)	+= rdacm20.o
diff --git a/drivers/media/i2c/isl7998x.c b/drivers/media/i2c/isl7998x.c
new file mode 100644
index 000000000000..130e0b33b38a
--- /dev/null
+++ b/drivers/media/i2c/isl7998x.c
@@ -0,0 +1,1394 @@ 
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Intersil ISL7998x analog to MIPI CSI-2 or BT.656 decoder driver.
+ *
+ * Copyright (C) 2018-2019 Marek Vasut <[e-mail]>
+ * Copyright (C) 2021 Michael Tretter <[e-mail]>
+ */
+
+#include <linux/bitfield.h>
+#include <linux/delay.h>
+#include <linux/gpio.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of_graph.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <linux/v4l2-mediabus.h>
+#include <linux/videodev2.h>
+
+#include <media/v4l2-async.h>
+#include <media/v4l2-common.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-fwnode.h>
+
+#define V4L2_CID_TEST_PATTERN_COLOR	(V4L2_CID_USER_BASE | 0x1001)
+#define V4L2_CID_TEST_PATTERN_CHANNELS	(V4L2_CID_USER_BASE | 0x1002)
+#define V4L2_CID_TEST_PATTERN_BARS	(V4L2_CID_USER_BASE | 0x1003)
+
+#define ISL7998x_REG(page, reg)		(((page) << 8) | (reg))
+
+#define ISL7998x_REG_Pn_SIZE			256
+#define ISL7998x_REG_Pn_BASE(n)			((n) * ISL7998x_REG_Pn_SIZE)
+
+#define ISL7998x_REG_Px_DEC_PAGE(page)		ISL7998x_REG((page), 0xff)
+#define ISL7998x_REG_Px_DEC_PAGE_MASK		0xf
+#define ISL7998x_REG_P0_PRODUCT_ID_CODE		ISL7998x_REG(0, 0x00)
+#define ISL7998x_REG_P0_PRODUCT_REV_CODE	ISL7998x_REG(0, 0x01)
+#define ISL7998x_REG_P0_SW_RESET_CTL		ISL7998x_REG(0, 0x02)
+#define ISL7998x_REG_P0_IO_BUFFER_CTL		ISL7998x_REG(0, 0x03)
+#define ISL7998x_REG_P0_IO_BUFFER_CTL_1_1	ISL7998x_REG(0, 0x04)
+#define ISL7998x_REG_P0_IO_PAD_PULL_EN_CTL	ISL7998x_REG(0, 0x05)
+#define ISL7998x_REG_P0_IO_BUFFER_CTL_1_2	ISL7998x_REG(0, 0x06)
+#define ISL7998x_REG_P0_VIDEO_IN_CHAN_CTL	ISL7998x_REG(0, 0x07)
+#define ISL7998x_REG_P0_CLK_CTL_1		ISL7998x_REG(0, 0x08)
+#define ISL7998x_REG_P0_CLK_CTL_2		ISL7998x_REG(0, 0x09)
+#define ISL7998x_REG_P0_CLK_CTL_3		ISL7998x_REG(0, 0x0a)
+#define ISL7998x_REG_P0_CLK_CTL_4		ISL7998x_REG(0, 0x0b)
+#define ISL7998x_REG_P0_MPP1_SYNC_CTL		ISL7998x_REG(0, 0x0c)
+#define ISL7998x_REG_P0_MPP2_SYNC_CTL		ISL7998x_REG(0, 0x0d)
+#define ISL7998x_REG_P0_IRQ_SYNC_CTL		ISL7998x_REG(0, 0x0e)
+#define ISL7998x_REG_P0_INTERRUPT_STATUS	ISL7998x_REG(0, 0x10)
+#define ISL7998x_REG_P0_CHAN_1_IRQ		ISL7998x_REG(0, 0x11)
+#define ISL7998x_REG_P0_CHAN_2_IRQ		ISL7998x_REG(0, 0x12)
+#define ISL7998x_REG_P0_CHAN_3_IRQ		ISL7998x_REG(0, 0x13)
+#define ISL7998x_REG_P0_CHAN_4_IRQ		ISL7998x_REG(0, 0x14)
+#define ISL7998x_REG_P0_SHORT_DIAG_IRQ		ISL7998x_REG(0, 0x15)
+#define ISL7998x_REG_P0_CHAN_1_IRQ_EN		ISL7998x_REG(0, 0x16)
+#define ISL7998x_REG_P0_CHAN_2_IRQ_EN		ISL7998x_REG(0, 0x17)
+#define ISL7998x_REG_P0_CHAN_3_IRQ_EN		ISL7998x_REG(0, 0x18)
+#define ISL7998x_REG_P0_CHAN_4_IRQ_EN		ISL7998x_REG(0, 0x19)
+#define ISL7998x_REG_P0_SHORT_DIAG_IRQ_EN	ISL7998x_REG(0, 0x1a)
+#define ISL7998x_REG_P0_CHAN_1_STATUS		ISL7998x_REG(0, 0x1b)
+#define ISL7998x_REG_P0_CHAN_2_STATUS		ISL7998x_REG(0, 0x1c)
+#define ISL7998x_REG_P0_CHAN_3_STATUS		ISL7998x_REG(0, 0x1d)
+#define ISL7998x_REG_P0_CHAN_4_STATUS		ISL7998x_REG(0, 0x1e)
+#define ISL7998x_REG_P0_SHORT_DIAG_STATUS	ISL7998x_REG(0, 0x1f)
+#define ISL7998x_REG_P0_CLOCK_DELAY		ISL7998x_REG(0, 0x20)
+
+#define ISL7998x_REG_Px_DEC_INPUT_FMT(pg)	ISL7998x_REG((pg), 0x02)
+#define ISL7998x_REG_Px_DEC_STATUS_1(pg)	ISL7998x_REG((pg), 0x03)
+#define ISL7998x_REG_Px_DEC_HS_DELAY_CTL(pg)	ISL7998x_REG((pg), 0x04)
+#define ISL7998x_REG_Px_DEC_ANCTL(pg)		ISL7998x_REG((pg), 0x06)
+#define ISL7998x_REG_Px_DEC_CROP_HI(pg)		ISL7998x_REG((pg), 0x07)
+#define ISL7998x_REG_Px_DEC_VDELAY_LO(pg)	ISL7998x_REG((pg), 0x08)
+#define ISL7998x_REG_Px_DEC_VACTIVE_LO(pg)	ISL7998x_REG((pg), 0x09)
+#define ISL7998x_REG_Px_DEC_HDELAY_LO(pg)	ISL7998x_REG((pg), 0x0a)
+#define ISL7998x_REG_Px_DEC_HACTIVE_LO(pg)	ISL7998x_REG((pg), 0x0b)
+#define ISL7998x_REG_Px_DEC_CNTRL1(pg)		ISL7998x_REG((pg), 0x0c)
+#define ISL7998x_REG_Px_DEC_CSC_CTL(pg)		ISL7998x_REG((pg), 0x0d)
+#define ISL7998x_REG_Px_DEC_BRIGHT(pg)		ISL7998x_REG((pg), 0x10)
+#define ISL7998x_REG_Px_DEC_CONTRAST(pg)	ISL7998x_REG((pg), 0x11)
+#define ISL7998x_REG_Px_DEC_SHARPNESS(pg)	ISL7998x_REG((pg), 0x12)
+#define ISL7998x_REG_Px_DEC_SAT_U(pg)		ISL7998x_REG((pg), 0x13)
+#define ISL7998x_REG_Px_DEC_SAT_V(pg)		ISL7998x_REG((pg), 0x14)
+#define ISL7998x_REG_Px_DEC_HUE(pg)		ISL7998x_REG((pg), 0x15)
+#define ISL7998x_REG_Px_DEC_VERT_PEAK(pg)	ISL7998x_REG((pg), 0x17)
+#define ISL7998x_REG_Px_DEC_CORING(pg)		ISL7998x_REG((pg), 0x18)
+#define ISL7998x_REG_Px_DEC_SDT(pg)		ISL7998x_REG((pg), 0x1c)
+#define ISL7998x_REG_Px_DEC_SDT_NOW		GENMASK(6, 4)
+#define ISL7998x_REG_Px_DEC_SDT_DET		BIT(7)
+#define ISL7998x_REG_Px_DEC_SDTR(pg)		ISL7998x_REG((pg), 0x1d)
+#define ISL7998x_REG_Px_DEC_CLMPG(pg)		ISL7998x_REG((pg), 0x20)
+#define ISL7998x_REG_Px_DEC_IAGC(pg)		ISL7998x_REG((pg), 0x21)
+#define ISL7998x_REG_Px_DEC_AGCGAIN(pg)		ISL7998x_REG((pg), 0x22)
+#define ISL7998x_REG_Px_DEC_PEAKWT(pg)		ISL7998x_REG((pg), 0x23)
+#define ISL7998x_REG_Px_DEC_CLMPL(pg)		ISL7998x_REG((pg), 0x24)
+#define ISL7998x_REG_Px_DEC_SYNCT(pg)		ISL7998x_REG((pg), 0x25)
+#define ISL7998x_REG_Px_DEC_MISSCNT(pg)		ISL7998x_REG((pg), 0x26)
+#define ISL7998x_REG_Px_DEC_PCLAMP(pg)		ISL7998x_REG((pg), 0x27)
+#define ISL7998x_REG_Px_DEC_VERT_CTL_1(pg)	ISL7998x_REG((pg), 0x28)
+#define ISL7998x_REG_Px_DEC_VERT_CTL_2(pg)	ISL7998x_REG((pg), 0x29)
+#define ISL7998x_REG_Px_DEC_CLR_KILL_LVL(pg)	ISL7998x_REG((pg), 0x2a)
+#define ISL7998x_REG_Px_DEC_COMB_FILTER_CTL(pg)	ISL7998x_REG((pg), 0x2b)
+#define ISL7998x_REG_Px_DEC_LUMA_DELAY(pg)	ISL7998x_REG((pg), 0x2c)
+#define ISL7998x_REG_Px_DEC_MISC1(pg)		ISL7998x_REG((pg), 0x2d)
+#define ISL7998x_REG_Px_DEC_MISC2(pg)		ISL7998x_REG((pg), 0x2e)
+#define ISL7998x_REG_Px_DEC_MISC3(pg)		ISL7998x_REG((pg), 0x2f)
+#define ISL7998x_REG_Px_DEC_MVSN(pg)		ISL7998x_REG((pg), 0x30)
+#define ISL7998x_REG_Px_DEC_CSTATUS2(pg)	ISL7998x_REG((pg), 0x31)
+#define ISL7998x_REG_Px_DEC_HFREF(pg)		ISL7998x_REG((pg), 0x32)
+#define ISL7998x_REG_Px_DEC_CLMD(pg)		ISL7998x_REG((pg), 0x33)
+#define ISL7998x_REG_Px_DEC_ID_DET_CTL(pg)	ISL7998x_REG((pg), 0x34)
+#define ISL7998x_REG_Px_DEC_CLCNTL(pg)		ISL7998x_REG((pg), 0x35)
+#define ISL7998x_REG_Px_DEC_DIFF_CLMP_CTL_1(pg)	ISL7998x_REG((pg), 0x36)
+#define ISL7998x_REG_Px_DEC_DIFF_CLMP_CTL_2(pg)	ISL7998x_REG((pg), 0x37)
+#define ISL7998x_REG_Px_DEC_DIFF_CLMP_CTL_3(pg)	ISL7998x_REG((pg), 0x38)
+#define ISL7998x_REG_Px_DEC_DIFF_CLMP_CTL_4(pg)	ISL7998x_REG((pg), 0x39)
+#define ISL7998x_REG_Px_DEC_SHORT_DET_CTL(pg)	ISL7998x_REG((pg), 0x3a)
+#define ISL7998x_REG_Px_DEC_SHORT_DET_CTL_1(pg)	ISL7998x_REG((pg), 0x3b)
+#define ISL7998x_REG_Px_DEC_AFE_TST_MUX_CTL(pg)	ISL7998x_REG((pg), 0x3c)
+#define ISL7998x_REG_Px_DEC_DATA_CONV(pg)	ISL7998x_REG((pg), 0x3d)
+#define ISL7998x_REG_Px_DEC_INTERNAL_TEST(pg)	ISL7998x_REG((pg), 0x3f)
+#define ISL7998x_REG_Px_DEC_H_DELAY_CTL(pg)	ISL7998x_REG((pg), 0x43)
+#define ISL7998x_REG_Px_DEC_H_DELAY_II_HI(pg)	ISL7998x_REG((pg), 0x44)
+#define ISL7998x_REG_Px_DEC_H_DELAY_II_LOW(pg)	ISL7998x_REG((pg), 0x45)
+
+#define ISL7998x_REG_Px_ACA_CTL_1(pg)		ISL7998x_REG((pg), 0x80)
+#define ISL7998x_REG_Px_ACA_GAIN_CTL(pg)	ISL7998x_REG((pg), 0x81)
+#define ISL7998x_REG_Px_ACA_Y_AVG_HI_LIMIT(pg)	ISL7998x_REG((pg), 0x82)
+#define ISL7998x_REG_Px_ACA_Y_AVG_LO_LIMIT(pg)	ISL7998x_REG((pg), 0x83)
+#define ISL7998x_REG_Px_ACA_Y_DET_THRESHOLD(pg)	ISL7998x_REG((pg), 0x84)
+#define ISL7998x_REG_Px_ACA_BLACK_LVL(pg)	ISL7998x_REG((pg), 0x85)
+#define ISL7998x_REG_Px_ACA_CENTER_LVL(pg)	ISL7998x_REG((pg), 0x86)
+#define ISL7998x_REG_Px_ACA_WHITE_LVL(pg)	ISL7998x_REG((pg), 0x87)
+#define ISL7998x_REG_Px_ACA_MEAN_OFF_LIMIT(pg)	ISL7998x_REG((pg), 0x88)
+#define ISL7998x_REG_Px_ACA_MEAN_OFF_UPGAIN(pg)	ISL7998x_REG((pg), 0x89)
+#define ISL7998x_REG_Px_ACA_MEAN_OFF_SLOPE(pg)	ISL7998x_REG((pg), 0x8a)
+#define ISL7998x_REG_Px_ACA_MEAN_OFF_DNGAIN(pg)	ISL7998x_REG((pg), 0x8b)
+#define ISL7998x_REG_Px_ACA_DELTA_CO_THRES(pg)	ISL7998x_REG((pg), 0x8c)
+#define ISL7998x_REG_Px_ACA_DELTA_SLOPE(pg)	ISL7998x_REG((pg), 0x8d)
+#define ISL7998x_REG_Px_ACA_LO_HI_AVG_THRES(pg)	ISL7998x_REG((pg), 0x8e)
+#define ISL7998x_REG_Px_ACA_LO_MAX_LVL_CTL(pg)	ISL7998x_REG((pg), 0x8f)
+#define ISL7998x_REG_Px_ACA_HI_MAX_LVL_CTL(pg)	ISL7998x_REG((pg), 0x90)
+#define ISL7998x_REG_Px_ACA_LO_UPGAIN_CTL(pg)	ISL7998x_REG((pg), 0x91)
+#define ISL7998x_REG_Px_ACA_LO_DNGAIN_CTL(pg)	ISL7998x_REG((pg), 0x92)
+#define ISL7998x_REG_Px_ACA_HI_UPGAIN_CTL(pg)	ISL7998x_REG((pg), 0x93)
+#define ISL7998x_REG_Px_ACA_HI_DNGAIN_CTL(pg)	ISL7998x_REG((pg), 0x94)
+#define ISL7998x_REG_Px_ACA_LOPASS_FLT_COEF(pg)	ISL7998x_REG((pg), 0x95)
+#define ISL7998x_REG_Px_ACA_PDF_INDEX(pg)	ISL7998x_REG((pg), 0x96)
+#define ISL7998x_REG_Px_ACA_HIST_WIN_H_STT(pg)	ISL7998x_REG((pg), 0x97)
+#define ISL7998x_REG_Px_ACA_HIST_WIN_H_SZ1(pg)	ISL7998x_REG((pg), 0x98)
+#define ISL7998x_REG_Px_ACA_HIST_WIN_H_SZ2(pg)	ISL7998x_REG((pg), 0x99)
+#define ISL7998x_REG_Px_ACA_HIST_WIN_V_STT(pg)	ISL7998x_REG((pg), 0x9a)
+#define ISL7998x_REG_Px_ACA_HIST_WIN_V_SZ1(pg)	ISL7998x_REG((pg), 0x9b)
+#define ISL7998x_REG_Px_ACA_HIST_WIN_V_SZ2(pg)	ISL7998x_REG((pg), 0x9c)
+#define ISL7998x_REG_Px_ACA_Y_AVG(pg)		ISL7998x_REG((pg), 0xa0)
+#define ISL7998x_REG_Px_ACA_Y_AVG_LIM(pg)	ISL7998x_REG((pg), 0xa1)
+#define ISL7998x_REG_Px_ACA_LO_AVG(pg)		ISL7998x_REG((pg), 0xa2)
+#define ISL7998x_REG_Px_ACA_HI_AVG(pg)		ISL7998x_REG((pg), 0xa3)
+#define ISL7998x_REG_Px_ACA_Y_MAX(pg)		ISL7998x_REG((pg), 0xa4)
+#define ISL7998x_REG_Px_ACA_Y_MIN(pg)		ISL7998x_REG((pg), 0xa5)
+#define ISL7998x_REG_Px_ACA_MOFFSET(pg)		ISL7998x_REG((pg), 0xa6)
+#define ISL7998x_REG_Px_ACA_LO_GAIN(pg)		ISL7998x_REG((pg), 0xa7)
+#define ISL7998x_REG_Px_ACA_HI_GAIN(pg)		ISL7998x_REG((pg), 0xa8)
+#define ISL7998x_REG_Px_ACA_LL_SLOPE(pg)	ISL7998x_REG((pg), 0xa9)
+#define ISL7998x_REG_Px_ACA_LH_SLOPE(pg)	ISL7998x_REG((pg), 0xaa)
+#define ISL7998x_REG_Px_ACA_HL_SLOPE(pg)	ISL7998x_REG((pg), 0xab)
+#define ISL7998x_REG_Px_ACA_HH_SLOPE(pg)	ISL7998x_REG((pg), 0xac)
+#define ISL7998x_REG_Px_ACA_X_LOW(pg)		ISL7998x_REG((pg), 0xad)
+#define ISL7998x_REG_Px_ACA_X_MEAN(pg)		ISL7998x_REG((pg), 0xae)
+#define ISL7998x_REG_Px_ACA_X_HIGH(pg)		ISL7998x_REG((pg), 0xaf)
+#define ISL7998x_REG_Px_ACA_Y_LOW(pg)		ISL7998x_REG((pg), 0xb0)
+#define ISL7998x_REG_Px_ACA_Y_MEAN(pg)		ISL7998x_REG((pg), 0xb1)
+#define ISL7998x_REG_Px_ACA_Y_HIGH(pg)		ISL7998x_REG((pg), 0xb2)
+#define ISL7998x_REG_Px_ACA_CTL_2(pg)		ISL7998x_REG((pg), 0xb3)
+#define ISL7998x_REG_Px_ACA_CTL_3(pg)		ISL7998x_REG((pg), 0xb4)
+#define ISL7998x_REG_Px_ACA_CTL_4(pg)		ISL7998x_REG((pg), 0xb5)
+#define ISL7998x_REG_Px_ACA_FLEX_WIN_HIST(pg)	ISL7998x_REG((pg), 0xc0)
+#define ISL7998x_REG_Px_ACA_FLEX_WIN_X_TL_H(pg)	ISL7998x_REG((pg), 0xc1)
+#define ISL7998x_REG_Px_ACA_FLEX_WIN_X_TL_L(pg)	ISL7998x_REG((pg), 0xc2)
+#define ISL7998x_REG_Px_ACA_FLEX_WIN_Y_TL_H(pg)	ISL7998x_REG((pg), 0xc3)
+#define ISL7998x_REG_Px_ACA_FLEX_WIN_Y_TL_L(pg)	ISL7998x_REG((pg), 0xc4)
+#define ISL7998x_REG_Px_ACA_FLEX_WIN_X_TR_H(pg)	ISL7998x_REG((pg), 0xc5)
+#define ISL7998x_REG_Px_ACA_FLEX_WIN_X_TR_L(pg)	ISL7998x_REG((pg), 0xc6)
+#define ISL7998x_REG_Px_ACA_FLEX_WIN_Y_TR_H(pg)	ISL7998x_REG((pg), 0xc7)
+#define ISL7998x_REG_Px_ACA_FLEX_WIN_Y_TR_L(pg)	ISL7998x_REG((pg), 0xc8)
+#define ISL7998x_REG_Px_ACA_FLEX_WIN_X_BL_H(pg)	ISL7998x_REG((pg), 0xc9)
+#define ISL7998x_REG_Px_ACA_FLEX_WIN_X_BL_L(pg)	ISL7998x_REG((pg), 0xca)
+#define ISL7998x_REG_Px_ACA_FLEX_WIN_Y_BL_H(pg)	ISL7998x_REG((pg), 0xcb)
+#define ISL7998x_REG_Px_ACA_FLEX_WIN_Y_BL_L(pg)	ISL7998x_REG((pg), 0xcc)
+#define ISL7998x_REG_Px_ACA_FLEX_WIN_X_BR_H(pg)	ISL7998x_REG((pg), 0xcd)
+#define ISL7998x_REG_Px_ACA_FLEX_WIN_X_BR_L(pg)	ISL7998x_REG((pg), 0xce)
+#define ISL7998x_REG_Px_ACA_FLEX_WIN_Y_BR_H(pg)	ISL7998x_REG((pg), 0xcf)
+#define ISL7998x_REG_Px_ACA_FLEX_WIN_Y_BR_L(pg)	ISL7998x_REG((pg), 0xd0)
+#define ISL7998x_REG_Px_ACA_FLEX_WIN_X_LM_H(pg)	ISL7998x_REG((pg), 0xd1)
+#define ISL7998x_REG_Px_ACA_FLEX_WIN_X_LM_L(pg)	ISL7998x_REG((pg), 0xd2)
+#define ISL7998x_REG_Px_ACA_FLEX_WIN_Y_LM_H(pg)	ISL7998x_REG((pg), 0xd3)
+#define ISL7998x_REG_Px_ACA_FLEX_WIN_Y_LM_L(pg)	ISL7998x_REG((pg), 0xd4)
+#define ISL7998x_REG_Px_ACA_FLEX_WIN_X_TM_H(pg)	ISL7998x_REG((pg), 0xd5)
+#define ISL7998x_REG_Px_ACA_FLEX_WIN_X_TM_L(pg)	ISL7998x_REG((pg), 0xd6)
+#define ISL7998x_REG_Px_ACA_FLEX_WIN_Y_TM_H(pg)	ISL7998x_REG((pg), 0xd7)
+#define ISL7998x_REG_Px_ACA_FLEX_WIN_Y_TM_L(pg)	ISL7998x_REG((pg), 0xd8)
+#define ISL7998x_REG_Px_ACA_FLEX_WIN_X_BM_H(pg)	ISL7998x_REG((pg), 0xd9)
+#define ISL7998x_REG_Px_ACA_FLEX_WIN_X_BM_L(pg)	ISL7998x_REG((pg), 0xda)
+#define ISL7998x_REG_Px_ACA_FLEX_WIN_Y_BM_H(pg)	ISL7998x_REG((pg), 0xdb)
+#define ISL7998x_REG_Px_ACA_FLEX_WIN_Y_BM_L(pg)	ISL7998x_REG((pg), 0xdc)
+#define ISL7998x_REG_Px_ACA_FLEX_WIN_X_RM_H(pg)	ISL7998x_REG((pg), 0xdd)
+#define ISL7998x_REG_Px_ACA_FLEX_WIN_X_RM_L(pg)	ISL7998x_REG((pg), 0xde)
+#define ISL7998x_REG_Px_ACA_FLEX_WIN_Y_RM_H(pg)	ISL7998x_REG((pg), 0xdf)
+#define ISL7998x_REG_Px_ACA_FLEX_WIN_Y_RM_L(pg)	ISL7998x_REG((pg), 0xe0)
+#define ISL7998x_REG_Px_ACA_HIST_DATA_LO(pg)	ISL7998x_REG((pg), 0xe1)
+#define ISL7998x_REG_Px_ACA_HIST_DATA_MID(pg)	ISL7998x_REG((pg), 0xe2)
+#define ISL7998x_REG_Px_ACA_HIST_DATA_HI(pg)	ISL7998x_REG((pg), 0xe3)
+#define ISL7998x_REG_Px_ACA_FLEX_WIN_Y_CLR(pg)	ISL7998x_REG((pg), 0xe4)
+#define ISL7998x_REG_Px_ACA_FLEX_WIN_CB_CLR(pg)	ISL7998x_REG((pg), 0xe5)
+#define ISL7998x_REG_Px_ACA_FLEX_WIN_CR_CLR(pg)	ISL7998x_REG((pg), 0xe6)
+#define ISL7998x_REG_Px_ACA_XFER_HIST_HOST(pg)	ISL7998x_REG((pg), 0xe7)
+
+#define ISL7998x_REG_P5_LI_ENGINE_CTL		ISL7998x_REG(5, 0x00)
+#define ISL7998x_REG_P5_LI_ENGINE_LINE_CTL	ISL7998x_REG(5, 0x01)
+#define ISL7998x_REG_P5_LI_ENGINE_PIC_WIDTH	ISL7998x_REG(5, 0x02)
+#define ISL7998x_REG_P5_LI_ENGINE_SYNC_CTL	ISL7998x_REG(5, 0x03)
+#define ISL7998x_REG_P5_LI_ENGINE_VC_ASSIGNMENT	ISL7998x_REG(5, 0x04)
+#define ISL7998x_REG_P5_LI_ENGINE_TYPE_CTL	ISL7998x_REG(5, 0x05)
+#define ISL7998x_REG_P5_LI_ENGINE_FIFO_CTL	ISL7998x_REG(5, 0x06)
+#define ISL7998x_REG_P5_MIPI_READ_START_CTL	ISL7998x_REG(5, 0x07)
+#define ISL7998x_REG_P5_PSEUDO_FRM_FIELD_CTL	ISL7998x_REG(5, 0x08)
+#define ISL7998x_REG_P5_ONE_FIELD_MODE_CTL	ISL7998x_REG(5, 0x09)
+#define ISL7998x_REG_P5_MIPI_INT_HW_TST_CTR	ISL7998x_REG(5, 0x0a)
+#define ISL7998x_REG_P5_TP_GEN_BAR_PATTERN	ISL7998x_REG(5, 0x0b)
+#define ISL7998x_REG_P5_MIPI_PCNT_PSFRM		ISL7998x_REG(5, 0x0c)
+#define ISL7998x_REG_P5_LI_ENGINE_TP_GEN_CTL	ISL7998x_REG(5, 0x0d)
+#define ISL7998x_REG_P5_MIPI_VBLANK_PSFRM	ISL7998x_REG(5, 0x0e)
+#define ISL7998x_REG_P5_LI_ENGINE_CTL_2		ISL7998x_REG(5, 0x0f)
+#define ISL7998x_REG_P5_MIPI_WCNT_1		ISL7998x_REG(5, 0x10)
+#define ISL7998x_REG_P5_MIPI_WCNT_2		ISL7998x_REG(5, 0x11)
+#define ISL7998x_REG_P5_MIPI_DPHY_TIMING_CTL_1	ISL7998x_REG(5, 0x12)
+#define ISL7998x_REG_P5_MIPI_DPHY_TIMING_CTL_2	ISL7998x_REG(5, 0x13)
+#define ISL7998x_REG_P5_MIPI_DPHY_TIMING_CTL_3	ISL7998x_REG(5, 0x14)
+#define ISL7998x_REG_P5_MIPI_DPHY_TIMING_CTL_4	ISL7998x_REG(5, 0x15)
+#define ISL7998x_REG_P5_MIPI_DPHY_TIMING_CTL_5	ISL7998x_REG(5, 0x16)
+#define ISL7998x_REG_P5_MIPI_DPHY_TIMING_CTL_6	ISL7998x_REG(5, 0x17)
+#define ISL7998x_REG_P5_MIPI_DPHY_PARAMS_1	ISL7998x_REG(5, 0x18)
+#define ISL7998x_REG_P5_MIPI_DPHY_SOT_PERIOD	ISL7998x_REG(5, 0x19)
+#define ISL7998x_REG_P5_MIPI_DPHY_EOT_PERIOD	ISL7998x_REG(5, 0x1a)
+#define ISL7998x_REG_P5_MIPI_DPHY_PARAMS_2	ISL7998x_REG(5, 0x1b)
+#define ISL7998x_REG_P5_MIPI_DPHY_TIMING_CTL_7	ISL7998x_REG(5, 0x1c)
+#define ISL7998x_REG_P5_MIPI_DPHY_TIMING_CTL_8	ISL7998x_REG(5, 0x1d)
+#define ISL7998x_REG_P5_MIPI_DPHY_TIMING_CTL_9	ISL7998x_REG(5, 0x1e)
+#define ISL7998x_REG_P5_MIPI_DPHY_TIMING_CTL_10	ISL7998x_REG(5, 0x1f)
+#define ISL7998x_REG_P5_TP_GEN_MIPI		ISL7998x_REG(5, 0x20)
+#define ISL7998x_REG_P5_ESC_MODE_TIME_CTL	ISL7998x_REG(5, 0x21)
+#define ISL7998x_REG_P5_AUTO_TEST_ERR_DET	ISL7998x_REG(5, 0x22)
+#define ISL7998x_REG_P5_MIPI_TIMING		ISL7998x_REG(5, 0x23)
+#define ISL7998x_REG_P5_PIC_HEIGHT_HIGH		ISL7998x_REG(5, 0x24)
+#define ISL7998x_REG_P5_PIC_HEIGHT_LOW		ISL7998x_REG(5, 0x25)
+#define ISL7998x_REG_P5_MIPI_SP_HS_TRL_CTL	ISL7998x_REG(5, 0x26)
+#define ISL7998x_REG_P5_FIFO_THRSH_CNT_1	ISL7998x_REG(5, 0x28)
+#define ISL7998x_REG_P5_FIFO_THRSH_CNT_2	ISL7998x_REG(5, 0x29)
+#define ISL7998x_REG_P5_TP_GEN_RND_SYNC_CTL_1	ISL7998x_REG(5, 0x2a)
+#define ISL7998x_REG_P5_TP_GEN_RND_SYNC_CTL_2	ISL7998x_REG(5, 0x2b)
+#define ISL7998x_REG_P5_PSF_FIELD_END_CTL_1	ISL7998x_REG(5, 0x2c)
+#define ISL7998x_REG_P5_PSF_FIELD_END_CTL_2	ISL7998x_REG(5, 0x2d)
+#define ISL7998x_REG_P5_PSF_FIELD_END_CTL_3	ISL7998x_REG(5, 0x2e)
+#define ISL7998x_REG_P5_PSF_FIELD_END_CTL_4	ISL7998x_REG(5, 0x2f)
+#define ISL7998x_REG_P5_MIPI_ANA_DATA_CTL_1	ISL7998x_REG(5, 0x30)
+#define ISL7998x_REG_P5_MIPI_ANA_DATA_CTL_2	ISL7998x_REG(5, 0x31)
+#define ISL7998x_REG_P5_MIPI_ANA_CLK_CTL	ISL7998x_REG(5, 0x32)
+#define ISL7998x_REG_P5_PLL_ANA_STATUS		ISL7998x_REG(5, 0x33)
+#define ISL7998x_REG_P5_PLL_ANA_MISC_CTL	ISL7998x_REG(5, 0x34)
+#define ISL7998x_REG_P5_MIPI_ANA		ISL7998x_REG(5, 0x35)
+#define ISL7998x_REG_P5_PLL_ANA			ISL7998x_REG(5, 0x36)
+#define ISL7998x_REG_P5_TOTAL_PF_LINE_CNT_1	ISL7998x_REG(5, 0x38)
+#define ISL7998x_REG_P5_TOTAL_PF_LINE_CNT_2	ISL7998x_REG(5, 0x39)
+#define ISL7998x_REG_P5_H_LINE_CNT_1		ISL7998x_REG(5, 0x3a)
+#define ISL7998x_REG_P5_H_LINE_CNT_2		ISL7998x_REG(5, 0x3b)
+#define ISL7998x_REG_P5_HIST_LINE_CNT_1		ISL7998x_REG(5, 0x3c)
+#define ISL7998x_REG_P5_HIST_LINE_CNT_2		ISL7998x_REG(5, 0x3d)
+
+static const struct reg_sequence isl7998x_init_seq_1[] = {
+	{ ISL7998x_REG_P0_SHORT_DIAG_IRQ_EN, 0xff },
+	{ ISL7998x_REG_Px_DEC_SDT(0x1), 0x07 },
+	{ ISL7998x_REG_Px_DEC_SHORT_DET_CTL_1(0x1), 0x03 },
+	{ ISL7998x_REG_Px_DEC_SDT(0x2), 0x07 },
+	{ ISL7998x_REG_Px_DEC_SHORT_DET_CTL_1(0x2), 0x03 },
+	{ ISL7998x_REG_Px_DEC_SDT(0x3), 0x07 },
+	{ ISL7998x_REG_Px_DEC_SHORT_DET_CTL_1(0x3), 0x03 },
+	{ ISL7998x_REG_Px_DEC_SDT(0x4), 0x07 },
+	{ ISL7998x_REG_Px_DEC_SHORT_DET_CTL_1(0x4), 0x03 },
+	{ ISL7998x_REG_P5_LI_ENGINE_CTL, 0x00 },
+	{ ISL7998x_REG_P0_SW_RESET_CTL, 0x1f, 10 },
+	{ ISL7998x_REG_P0_IO_BUFFER_CTL, 0x00 },
+	{ ISL7998x_REG_P0_MPP2_SYNC_CTL, 0xc9 },
+	{ ISL7998x_REG_P0_IRQ_SYNC_CTL, 0xc9 },
+	{ ISL7998x_REG_P0_CHAN_1_IRQ, 0x03 },
+	{ ISL7998x_REG_P0_CHAN_2_IRQ, 0x00 },
+	{ ISL7998x_REG_P0_CHAN_3_IRQ, 0x00 },
+	{ ISL7998x_REG_P0_CHAN_4_IRQ, 0x00 },
+	{ ISL7998x_REG_P5_LI_ENGINE_CTL, 0x02 },
+	{ ISL7998x_REG_P5_LI_ENGINE_LINE_CTL, 0x85 },
+	{ ISL7998x_REG_P5_LI_ENGINE_PIC_WIDTH, 0xa0 },
+	{ ISL7998x_REG_P5_LI_ENGINE_SYNC_CTL, 0x18 },
+	{ ISL7998x_REG_P5_LI_ENGINE_TYPE_CTL, 0x40 },
+	{ ISL7998x_REG_P5_LI_ENGINE_FIFO_CTL, 0x40 },
+	{ ISL7998x_REG_P5_MIPI_WCNT_1, 0x05 },
+	{ ISL7998x_REG_P5_MIPI_WCNT_2, 0xa0 },
+	{ ISL7998x_REG_P5_TP_GEN_MIPI, 0x00 },
+	{ ISL7998x_REG_P5_ESC_MODE_TIME_CTL, 0x0c },
+	{ ISL7998x_REG_P5_MIPI_SP_HS_TRL_CTL, 0x00 },
+	{ ISL7998x_REG_P5_TP_GEN_RND_SYNC_CTL_1, 0x00 },
+	{ ISL7998x_REG_P5_TP_GEN_RND_SYNC_CTL_2, 0x19 },
+	{ ISL7998x_REG_P5_PSF_FIELD_END_CTL_1, 0x18 },
+	{ ISL7998x_REG_P5_PSF_FIELD_END_CTL_2, 0xf1 },
+	{ ISL7998x_REG_P5_PSF_FIELD_END_CTL_3, 0x00 },
+	{ ISL7998x_REG_P5_PSF_FIELD_END_CTL_4, 0xf1 },
+	{ ISL7998x_REG_P5_MIPI_ANA_DATA_CTL_1, 0x00 },
+	{ ISL7998x_REG_P5_MIPI_ANA_DATA_CTL_2, 0x00 },
+	{ ISL7998x_REG_P5_MIPI_ANA_CLK_CTL, 0x00 },
+	{ ISL7998x_REG_P5_PLL_ANA_STATUS, 0xc0 },
+	{ ISL7998x_REG_P5_PLL_ANA_MISC_CTL, 0x18 },
+	{ ISL7998x_REG_P5_PLL_ANA, 0x00 },
+	{ ISL7998x_REG_P0_SW_RESET_CTL, 0x10, 10 },
+	/* Page 0xf means write to all of pages 1,2,3,4 */
+	{ ISL7998x_REG_Px_DEC_VDELAY_LO(0xf), 0x14 },
+	{ ISL7998x_REG_Px_DEC_MISC3(0xf), 0xe6 },
+	{ ISL7998x_REG_Px_DEC_CLMD(0xf), 0x85 },
+	{ ISL7998x_REG_Px_DEC_H_DELAY_II_LOW(0xf), 0x11 },
+	{ ISL7998x_REG_Px_ACA_XFER_HIST_HOST(0xf), 0x00 },
+	{ ISL7998x_REG_P0_CLK_CTL_1, 0x1f },
+	{ ISL7998x_REG_P0_CLK_CTL_2, 0x43 },
+	{ ISL7998x_REG_P0_CLK_CTL_3, 0x4f },
+};
+
+static const struct reg_sequence isl7998x_init_seq_2[] = {
+	{ ISL7998x_REG_P5_LI_ENGINE_SYNC_CTL, 0x10 },
+	{ ISL7998x_REG_P5_LI_ENGINE_VC_ASSIGNMENT, 0xe4 },
+	{ ISL7998x_REG_P5_LI_ENGINE_TYPE_CTL, 0x00 },
+	{ ISL7998x_REG_P5_LI_ENGINE_FIFO_CTL, 0x60 },
+	{ ISL7998x_REG_P5_MIPI_READ_START_CTL, 0x2b },
+	{ ISL7998x_REG_P5_PSEUDO_FRM_FIELD_CTL, 0x02 },
+	{ ISL7998x_REG_P5_ONE_FIELD_MODE_CTL, 0x00 },
+	{ ISL7998x_REG_P5_MIPI_INT_HW_TST_CTR, 0x62 },
+	{ ISL7998x_REG_P5_TP_GEN_BAR_PATTERN, 0x02 },
+	{ ISL7998x_REG_P5_MIPI_PCNT_PSFRM, 0x36 },
+	{ ISL7998x_REG_P5_LI_ENGINE_TP_GEN_CTL, 0x00 },
+	{ ISL7998x_REG_P5_MIPI_VBLANK_PSFRM, 0x6c },
+	{ ISL7998x_REG_P5_LI_ENGINE_CTL_2, 0x00 },
+	{ ISL7998x_REG_P5_MIPI_WCNT_1, 0x05 },
+	{ ISL7998x_REG_P5_MIPI_WCNT_2, 0xa0 },
+	{ ISL7998x_REG_P5_MIPI_DPHY_TIMING_CTL_1, 0x77 },
+	{ ISL7998x_REG_P5_MIPI_DPHY_TIMING_CTL_2, 0x17 },
+	{ ISL7998x_REG_P5_MIPI_DPHY_TIMING_CTL_3, 0x08 },
+	{ ISL7998x_REG_P5_MIPI_DPHY_TIMING_CTL_4, 0x38 },
+	{ ISL7998x_REG_P5_MIPI_DPHY_TIMING_CTL_5, 0x14 },
+	{ ISL7998x_REG_P5_MIPI_DPHY_TIMING_CTL_6, 0xf6 },
+	{ ISL7998x_REG_P5_MIPI_DPHY_PARAMS_1, 0x00 },
+	{ ISL7998x_REG_P5_MIPI_DPHY_SOT_PERIOD, 0x17 },
+	{ ISL7998x_REG_P5_MIPI_DPHY_EOT_PERIOD, 0x0a },
+	{ ISL7998x_REG_P5_MIPI_DPHY_PARAMS_2, 0x71 },
+	{ ISL7998x_REG_P5_MIPI_DPHY_TIMING_CTL_7, 0x7a },
+	{ ISL7998x_REG_P5_MIPI_DPHY_TIMING_CTL_8, 0x0f },
+	{ ISL7998x_REG_P5_MIPI_DPHY_TIMING_CTL_9, 0x8c },
+	{ ISL7998x_REG_P5_MIPI_SP_HS_TRL_CTL, 0x08 },
+	{ ISL7998x_REG_P5_FIFO_THRSH_CNT_1, 0x01 },
+	{ ISL7998x_REG_P5_FIFO_THRSH_CNT_2, 0x0e },
+	{ ISL7998x_REG_P5_TP_GEN_RND_SYNC_CTL_1, 0x00 },
+	{ ISL7998x_REG_P5_TP_GEN_RND_SYNC_CTL_2, 0x00 },
+	{ ISL7998x_REG_P5_TOTAL_PF_LINE_CNT_1, 0x03 },
+	{ ISL7998x_REG_P5_TOTAL_PF_LINE_CNT_2, 0xc0 },
+	{ ISL7998x_REG_P5_H_LINE_CNT_1, 0x06 },
+	{ ISL7998x_REG_P5_H_LINE_CNT_2, 0xb3 },
+	{ ISL7998x_REG_P5_HIST_LINE_CNT_1, 0x00 },
+	{ ISL7998x_REG_P5_HIST_LINE_CNT_2, 0xf1 },
+	{ ISL7998x_REG_P5_LI_ENGINE_FIFO_CTL, 0x00 },
+	{ ISL7998x_REG_P5_MIPI_ANA, 0x00 },
+	/*
+	 * Wait a bit after reset so that the chip can capture a frame
+	 * and update internal line counters.
+	 */
+	{ ISL7998x_REG_P0_SW_RESET_CTL, 0x00, 50 },
+};
+
+enum isl7998x_pads {
+	ISL7998x_PAD_OUT,
+	ISL7998x_PAD_VIN1,
+	ISL7998x_PAD_VIN2,
+	ISL7998x_PAD_VIN3,
+	ISL7998x_PAD_VIN4,
+	ISL7998x_NUM_PADS
+};
+
+struct isl7998x_datafmt {
+	u32			code;
+	enum v4l2_colorspace	colorspace;
+};
+
+static const struct isl7998x_datafmt isl7998x_colour_fmts[] = {
+	{ MEDIA_BUS_FMT_UYVY8_2X8, V4L2_COLORSPACE_SRGB },
+};
+
+/* Menu items for LINK_FREQ V4L2 control */
+static const s64 link_freq_menu_items[] = {
+	/* 1 channel, 1 lane or 2 channels, 2 lanes */
+	108000000,
+	/* 2 channels, 1 lane or 4 channels, 2 lanes */
+	216000000,
+	/* 4 channels, 1 lane */
+	432000000,
+};
+
+/* Menu items for TEST_PATTERN V4L2 control */
+static const char * const isl7998x_test_pattern_menu[] = {
+	"Disabled",
+	"PAL (720x576)",
+	"NTSC (720x480)",
+};
+
+static const char * const isl7998x_test_pattern_bars[] = {
+	"bbbbwb", "bbbwwb", "bbwbwb", "bbwwwb",
+};
+
+static const char * const isl7998x_test_pattern_colors[] = {
+	"Yellow", "Blue", "Green", "Pink",
+};
+
+struct isl7998x_mode {
+	unsigned int width;
+	unsigned int height;
+	enum v4l2_field field;
+};
+
+static const struct isl7998x_mode supported_modes[] = {
+	{
+		.width = 720,
+		.height = 576,
+		.field = V4L2_FIELD_SEQ_TB,
+	},
+	{
+		.width = 720,
+		.height = 480,
+		.field = V4L2_FIELD_SEQ_BT,
+	},
+};
+
+struct isl7998x {
+	struct v4l2_subdev		subdev;
+	struct regmap			*regmap;
+	struct gpio_desc		*pd_gpio;
+	struct gpio_desc		*rstb_gpio;
+	unsigned int			nr_mipi_lanes;
+	u32				nr_inputs;
+
+	const struct isl7998x_mode	*mode;
+	const struct isl7998x_datafmt	*fmt;
+	struct media_pad		pads[ISL7998x_NUM_PADS];
+
+	struct v4l2_ctrl_handler	ctrl_handler;
+	/* protect ctrl_handler */
+	struct mutex			ctrl_mutex;
+
+	/* V4L2 Controls */
+	struct v4l2_ctrl		*link_freq;
+	u8				test_pattern;
+	u8				test_pattern_bars;
+	u8				test_pattern_chans;
+	u8				test_pattern_color;
+};
+
+static struct isl7998x *sd_to_isl7998x(struct v4l2_subdev *sd)
+{
+	return container_of(sd, struct isl7998x, subdev);
+}
+
+static struct isl7998x *i2c_to_isl7998x(const struct i2c_client *client)
+{
+	return sd_to_isl7998x(i2c_get_clientdata(client));
+}
+
+static const struct isl7998x_mode *isl7998x_get_mode(struct isl7998x *isl7998x)
+{
+	switch (isl7998x->test_pattern) {
+	case 1:
+		return &supported_modes[0];
+	case 2:
+		return &supported_modes[1];
+	default:
+		return isl7998x->mode;
+	}
+}
+
+static int isl7998x_get_nr_inputs(struct device_node *of_node)
+{
+	struct device_node *port;
+	unsigned int inputs = 0;
+	unsigned int i;
+
+	if (of_graph_get_endpoint_count(of_node) > ISL7998x_NUM_PADS)
+		return -EINVAL;
+
+	/*
+	 * The driver does not provide means to remap the input ports. It
+	 * always configures input ports to start from VID1. Ensure that the
+	 * device tree is correct.
+	 */
+	for (i = ISL7998x_PAD_VIN1; i < ISL7998x_PAD_VIN4; i++) {
+		port = of_graph_get_port_by_id(of_node, i);
+		if (!port)
+			continue;
+
+		inputs |= BIT(i);
+		of_node_put(port);
+	}
+
+	switch (inputs) {
+	case BIT(ISL7998x_PAD_VIN1):
+		return 1;
+	case BIT(ISL7998x_PAD_VIN1) | BIT(ISL7998x_PAD_VIN2):
+		return 2;
+	case BIT(ISL7998x_PAD_VIN1) | BIT(ISL7998x_PAD_VIN2) |
+	     BIT(ISL7998x_PAD_VIN3) | BIT(ISL7998x_PAD_VIN4):
+		return 4;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int isl7998x_wait_power_on(struct isl7998x *isl7998x)
+{
+	struct device *dev = isl7998x->subdev.dev;
+	u32 chip_id;
+	int ret;
+	int err;
+
+	ret = read_poll_timeout(regmap_read, err, !err, 2000, 20000, false,
+				isl7998x->regmap,
+				ISL7998x_REG_P0_PRODUCT_ID_CODE, &chip_id);
+	if (ret) {
+		dev_err(dev, "timeout while waiting for ISL7998x\n");
+		return ret;
+	}
+
+	dev_dbg(dev, "Found ISL799%x\n", chip_id);
+
+	return ret;
+}
+
+static int isl7998x_init(struct isl7998x *isl7998x)
+{
+	const unsigned int lanes = isl7998x->nr_mipi_lanes;
+	const u32 isl7998x_video_in_chan_map[] = { 0x00, 0x11, 0x02, 0x02 };
+	const struct reg_sequence isl7998x_init_seq_custom[] = {
+		{ ISL7998x_REG_P0_VIDEO_IN_CHAN_CTL,
+		  isl7998x_video_in_chan_map[isl7998x->nr_inputs - 1] },
+		{ ISL7998x_REG_P0_CLK_CTL_4,
+		  (lanes == 1) ? 0x40 : 0x41 },
+		{ ISL7998x_REG_P5_LI_ENGINE_CTL,
+		  (lanes == 1) ? 0x01 : 0x02 },
+		{ ISL7998x_REG_P5_LI_ENGINE_LINE_CTL,
+		  0x20 | ((isl7998x->mode->width >> 7) & 0x1f) },
+		{ ISL7998x_REG_P5_LI_ENGINE_PIC_WIDTH,
+		  (isl7998x->mode->width << 1) & 0xff },
+	};
+	struct device *dev = isl7998x->subdev.dev;
+	struct regmap *regmap = isl7998x->regmap;
+	int ret;
+
+	dev_dbg(dev, "configuring %d lanes for %d inputs (%dx%d)\n",
+		isl7998x->nr_mipi_lanes, isl7998x->nr_inputs,
+		isl7998x->mode->width, isl7998x->mode->height);
+
+	ret = regmap_register_patch(regmap, isl7998x_init_seq_1,
+				    ARRAY_SIZE(isl7998x_init_seq_1));
+	if (ret)
+		return ret;
+
+	ret = regmap_register_patch(regmap, isl7998x_init_seq_custom,
+				    ARRAY_SIZE(isl7998x_init_seq_custom));
+	if (ret)
+		return ret;
+
+	return regmap_register_patch(regmap, isl7998x_init_seq_2,
+				     ARRAY_SIZE(isl7998x_init_seq_2));
+}
+
+static const struct isl7998x_video_std {
+	int id;
+	const char *name;
+	const struct isl7998x_mode *mode;
+} isl7998x_std_res[] = {
+	{ 0, "NTSC (M)", &supported_modes[1]},
+	{ 1, "PAL (B, D, G, H, I)", &supported_modes[0]},
+	{ 2, "SECAM", &supported_modes[0]},
+	{ 3, "NTSC4.43", &supported_modes[1]},
+	{ 4, "PAL (M)", &supported_modes[1]},
+	{ 5, "PAL (CN)", &supported_modes[0]},
+	{ 6, "PAL 60", &supported_modes[1]},
+	{ 7, "N/A", NULL},
+};
+
+/*
+ * Detect and set video standard on video inputs.
+ */
+static int isl7998x_update_std(struct isl7998x *isl7998x)
+{
+#define ISL7998x_INPUTS			4
+	struct device *dev = isl7998x->subdev.dev;
+	unsigned int std_id[ISL7998x_INPUTS];
+	unsigned int i;
+	int ret;
+	u32 reg;
+
+	ret = pm_runtime_resume_and_get(dev);
+	if (ret)
+		return ret;
+
+	for (i = 0; i < ISL7998x_INPUTS; i++) {
+		ret = regmap_read_poll_timeout(isl7998x->regmap,
+				ISL7998x_REG_Px_DEC_SDT(i + 1),
+				reg, reg & ISL7998x_REG_Px_DEC_SDT_DET,
+				2000, 500 * USEC_PER_MSEC);
+		std_id[i] = FIELD_GET(ISL7998x_REG_Px_DEC_SDT_NOW, reg);
+		if (ret)
+			goto out;
+	}
+
+	/*
+	 * According to Renesas FAE, all input cameras must have the
+	 * same standard on this chip.
+	 */
+	for (i = 0; i < isl7998x->nr_inputs; i++) {
+		dev_dbg(dev, "input %d: detected %s\n",
+			i, isl7998x_std_res[std_id[i]].name);
+		if (std_id[0] != std_id[i])
+			dev_warn(dev,
+				 "incompatible standards: %s on input %d (expected %s)\n",
+				 isl7998x_std_res[std_id[i]].name, i,
+				 isl7998x_std_res[std_id[0]].name);
+	}
+
+	isl7998x->mode = isl7998x_std_res[std_id[0]].mode;
+
+out:
+	pm_runtime_put(dev);
+
+	return ret;
+}
+
+static int isl7998x_set_test_pattern(struct isl7998x *isl7998x)
+{
+	const struct reg_sequence isl7998x_init_seq_tpg_off[] = {
+		{ ISL7998x_REG_P5_LI_ENGINE_TP_GEN_CTL, 0 },
+		{ ISL7998x_REG_P5_LI_ENGINE_CTL_2, 0 }
+	};
+	const struct reg_sequence isl7998x_init_seq_tpg_on[] = {
+		{ ISL7998x_REG_P5_TP_GEN_BAR_PATTERN,
+		  isl7998x->test_pattern_bars << 6 },
+		{ ISL7998x_REG_P5_LI_ENGINE_CTL_2,
+		  isl7998x->test_pattern == 1 ? BIT(2) : 0 },
+		{ ISL7998x_REG_P5_LI_ENGINE_TP_GEN_CTL,
+		  (isl7998x->test_pattern_chans << 4) |
+		  (isl7998x->test_pattern_color << 2) }
+	};
+	struct device *dev = isl7998x->subdev.dev;
+	struct regmap *regmap = isl7998x->regmap;
+	int ret;
+
+	if (!pm_runtime_enabled(dev) || !pm_runtime_get_if_in_use(dev))
+		return 0;
+
+	if (isl7998x->test_pattern != 0) {
+		dev_dbg(dev, "test pattern: %s, channels 0x%x, %s, %s\n",
+			isl7998x_test_pattern_menu[isl7998x->test_pattern],
+			isl7998x->test_pattern_chans,
+			isl7998x_test_pattern_bars[isl7998x->test_pattern_bars],
+			isl7998x_test_pattern_colors[isl7998x->test_pattern_color]);
+		ret = regmap_register_patch(regmap, isl7998x_init_seq_tpg_on,
+					    ARRAY_SIZE(isl7998x_init_seq_tpg_on));
+	} else {
+		ret = regmap_register_patch(regmap, isl7998x_init_seq_tpg_off,
+					    ARRAY_SIZE(isl7998x_init_seq_tpg_off));
+	}
+
+	pm_runtime_put(dev);
+
+	return ret;
+}
+
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+static int isl7998x_g_register(struct v4l2_subdev *sd,
+			       struct v4l2_dbg_register *reg)
+{
+	struct isl7998x *isl7998x = sd_to_isl7998x(sd);
+	int ret;
+	u32 val;
+
+	ret = regmap_read(isl7998x->regmap, reg->reg, &val);
+	if (ret)
+		return ret;
+
+	reg->size = 1;
+	reg->val = val;
+
+	return 0;
+}
+
+static int isl7998x_s_register(struct v4l2_subdev *sd,
+			       const struct v4l2_dbg_register *reg)
+{
+	struct isl7998x *isl7998x = sd_to_isl7998x(sd);
+
+	return regmap_write(isl7998x->regmap, reg->reg, reg->val);
+}
+#endif
+
+static int isl7998x_s_stream(struct v4l2_subdev *sd, int enable)
+{
+	struct isl7998x *isl7998x = sd_to_isl7998x(sd);
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+	struct device *dev = &client->dev;
+	int ret = 0;
+	u32 reg;
+
+	dev_dbg(dev, "stream %s\n", enable ? "ON" : "OFF");
+
+	if (enable) {
+		ret = isl7998x_set_test_pattern(isl7998x);
+		if (ret)
+			return ret;
+	}
+
+	regmap_read(isl7998x->regmap,
+		    ISL7998x_REG_P5_LI_ENGINE_CTL, &reg);
+	if (enable)
+		reg &= ~BIT(7);
+	else
+		reg |= BIT(7);
+	ret = regmap_write(isl7998x->regmap,
+			   ISL7998x_REG_P5_LI_ENGINE_CTL, reg);
+
+	return ret;
+}
+
+static int isl7998x_pre_streamon(struct v4l2_subdev *sd, u32 flags)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+	struct device *dev = &client->dev;
+
+	if (flags & V4L2_SUBDEV_PRE_STREAMON_FL_MANUAL_LP)
+		return pm_runtime_resume_and_get(dev);
+
+	return 0;
+}
+
+static int isl7998x_post_streamoff(struct v4l2_subdev *sd)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+	struct device *dev = &client->dev;
+
+	pm_runtime_put(dev);
+
+	return 0;
+}
+
+static int isl7998x_enum_mbus_code(struct v4l2_subdev *sd,
+				   struct v4l2_subdev_state *sd_state,
+				   struct v4l2_subdev_mbus_code_enum *code)
+{
+	if (code->index >= ARRAY_SIZE(isl7998x_colour_fmts))
+		return -EINVAL;
+
+	code->code = isl7998x_colour_fmts[code->index].code;
+
+	return 0;
+}
+
+static int isl7998x_enum_frame_size(struct v4l2_subdev *sd,
+				    struct v4l2_subdev_state *sd_state,
+				    struct v4l2_subdev_frame_size_enum *fse)
+{
+	if (fse->index >= ARRAY_SIZE(supported_modes))
+		return -EINVAL;
+
+	if (fse->code != isl7998x_colour_fmts[0].code)
+		return -EINVAL;
+
+	fse->min_width = supported_modes[fse->index].width;
+	fse->max_width = fse->min_width;
+	fse->min_height = supported_modes[fse->index].height;
+	fse->max_height = fse->min_height;
+
+	return 0;
+}
+
+static int isl7998x_get_fmt(struct v4l2_subdev *sd,
+			    struct v4l2_subdev_state *sd_state,
+			    struct v4l2_subdev_format *format)
+{
+	struct isl7998x *isl7998x = sd_to_isl7998x(sd);
+	struct v4l2_mbus_framefmt *mf = &format->format;
+	const struct isl7998x_mode *mode = isl7998x_get_mode(isl7998x);
+
+	if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
+		format->format = *v4l2_subdev_get_try_format(sd, sd_state,
+							     format->pad);
+		return 0;
+	}
+
+	mf->width	= mode->width;
+	mf->height	= mode->height;
+	mf->code	= isl7998x->fmt->code;
+	mf->field	= mode->field;
+	mf->colorspace	= 0;
+
+	return 0;
+}
+
+static int isl7998x_set_fmt(struct v4l2_subdev *sd,
+			    struct v4l2_subdev_state *sd_state,
+			    struct v4l2_subdev_format *format)
+{
+	struct isl7998x *isl7998x = sd_to_isl7998x(sd);
+	struct v4l2_mbus_framefmt *mf = &format->format;
+	const struct isl7998x_mode *mode = isl7998x_get_mode(isl7998x);
+
+	mf->width = mode->width;
+	mf->height = mode->height;
+	mf->code = isl7998x->fmt->code;
+	mf->field = mode->field;
+
+	if (format->which == V4L2_SUBDEV_FORMAT_TRY)
+		*v4l2_subdev_get_try_format(sd, sd_state, format->pad) = format->format;
+
+	return 0;
+}
+
+static int isl7998x_set_ctrl(struct v4l2_ctrl *ctrl)
+{
+	struct isl7998x *isl7998x = container_of(ctrl->handler,
+						 struct isl7998x, ctrl_handler);
+
+	switch (ctrl->id) {
+	case V4L2_CID_TEST_PATTERN_BARS:
+		isl7998x->test_pattern_bars = ctrl->val & 0x3;
+		return isl7998x_set_test_pattern(isl7998x);
+	case V4L2_CID_TEST_PATTERN_CHANNELS:
+		isl7998x->test_pattern_chans = ctrl->val & 0xf;
+		return isl7998x_set_test_pattern(isl7998x);
+	case V4L2_CID_TEST_PATTERN_COLOR:
+		isl7998x->test_pattern_color = ctrl->val & 0x3;
+		return isl7998x_set_test_pattern(isl7998x);
+	case V4L2_CID_TEST_PATTERN:
+		isl7998x->test_pattern = ctrl->val;
+		return isl7998x_set_test_pattern(isl7998x);
+	}
+
+	return 0;
+}
+
+static const struct v4l2_subdev_core_ops isl7998x_subdev_core_ops = {
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+	.g_register	= isl7998x_g_register,
+	.s_register	= isl7998x_s_register,
+#endif
+};
+
+static const struct v4l2_subdev_video_ops isl7998x_subdev_video_ops = {
+	.s_stream	= isl7998x_s_stream,
+	.pre_streamon	= isl7998x_pre_streamon,
+	.post_streamoff	= isl7998x_post_streamoff,
+};
+
+static const struct v4l2_subdev_pad_ops isl7998x_subdev_pad_ops = {
+	.enum_mbus_code		= isl7998x_enum_mbus_code,
+	.enum_frame_size	= isl7998x_enum_frame_size,
+	.get_fmt		= isl7998x_get_fmt,
+	.set_fmt		= isl7998x_set_fmt,
+};
+
+static const struct v4l2_subdev_ops isl7998x_subdev_ops = {
+	.core		= &isl7998x_subdev_core_ops,
+	.video		= &isl7998x_subdev_video_ops,
+	.pad		= &isl7998x_subdev_pad_ops,
+};
+
+static const struct media_entity_operations isl7998x_entity_ops = {
+	.link_validate = v4l2_subdev_link_validate,
+};
+
+static const struct v4l2_ctrl_ops isl7998x_ctrl_ops = {
+	.s_ctrl			= isl7998x_set_ctrl,
+};
+
+static const struct v4l2_ctrl_config isl7998x_ctrls[] = {
+	{
+		.ops		= &isl7998x_ctrl_ops,
+		.id		= V4L2_CID_TEST_PATTERN_BARS,
+		.type		= V4L2_CTRL_TYPE_MENU,
+		.name		= "Test Pattern Bars",
+		.max		= ARRAY_SIZE(isl7998x_test_pattern_bars) - 1,
+		.def		= 0,
+		.qmenu		= isl7998x_test_pattern_bars,
+	}, {
+		.ops		= &isl7998x_ctrl_ops,
+		.id		= V4L2_CID_TEST_PATTERN_CHANNELS,
+		.type		= V4L2_CTRL_TYPE_INTEGER,
+		.name		= "Test Pattern Channels",
+		.min		= 0,
+		.max		= 0xf,
+		.step		= 1,
+		.def		= 0xf,
+		.flags		= 0,
+	}, {
+		.ops		= &isl7998x_ctrl_ops,
+		.id		= V4L2_CID_TEST_PATTERN_COLOR,
+		.type		= V4L2_CTRL_TYPE_MENU,
+		.name		= "Test Pattern Color",
+		.max		= ARRAY_SIZE(isl7998x_test_pattern_colors) - 1,
+		.def		= 0,
+		.qmenu		= isl7998x_test_pattern_colors,
+	},
+};
+
+#define ISL7998x_REG_DECODER_ACA_READABLE_RANGE(page)			\
+	/* Decoder range */						\
+	regmap_reg_range(ISL7998x_REG_Px_DEC_INPUT_FMT(page),		\
+			 ISL7998x_REG_Px_DEC_HS_DELAY_CTL(page)),	\
+	regmap_reg_range(ISL7998x_REG_Px_DEC_ANCTL(page),		\
+			 ISL7998x_REG_Px_DEC_CSC_CTL(page)),		\
+	regmap_reg_range(ISL7998x_REG_Px_DEC_BRIGHT(page),		\
+			 ISL7998x_REG_Px_DEC_HUE(page)),		\
+	regmap_reg_range(ISL7998x_REG_Px_DEC_VERT_PEAK(page),		\
+			 ISL7998x_REG_Px_DEC_CORING(page)),		\
+	regmap_reg_range(ISL7998x_REG_Px_DEC_SDT(page),			\
+			 ISL7998x_REG_Px_DEC_SDTR(page)),		\
+	regmap_reg_range(ISL7998x_REG_Px_DEC_CLMPG(page),		\
+			 ISL7998x_REG_Px_DEC_DATA_CONV(page)),		\
+	regmap_reg_range(ISL7998x_REG_Px_DEC_INTERNAL_TEST(page),	\
+			 ISL7998x_REG_Px_DEC_INTERNAL_TEST(page)),	\
+	regmap_reg_range(ISL7998x_REG_Px_DEC_H_DELAY_CTL(page),		\
+			 ISL7998x_REG_Px_DEC_H_DELAY_II_LOW(page)),	\
+	/* ACA range */							\
+	regmap_reg_range(ISL7998x_REG_Px_ACA_CTL_1(page),		\
+			 ISL7998x_REG_Px_ACA_HIST_WIN_V_SZ2(page)),	\
+	regmap_reg_range(ISL7998x_REG_Px_ACA_Y_AVG(page),		\
+			 ISL7998x_REG_Px_ACA_CTL_4(page)),		\
+	regmap_reg_range(ISL7998x_REG_Px_ACA_FLEX_WIN_HIST(page),	\
+			 ISL7998x_REG_Px_ACA_XFER_HIST_HOST(page)),	\
+	regmap_reg_range(ISL7998x_REG_Px_DEC_PAGE(page),		\
+			 ISL7998x_REG_Px_DEC_PAGE(page))
+
+#define ISL7998x_REG_DECODER_ACA_WRITEABLE_RANGE(page)			\
+	/* Decoder range */						\
+	regmap_reg_range(ISL7998x_REG_Px_DEC_INPUT_FMT(page),		\
+			 ISL7998x_REG_Px_DEC_INPUT_FMT(page)),		\
+	regmap_reg_range(ISL7998x_REG_Px_DEC_HS_DELAY_CTL(page),	\
+			 ISL7998x_REG_Px_DEC_HS_DELAY_CTL(page)),	\
+	regmap_reg_range(ISL7998x_REG_Px_DEC_ANCTL(page),		\
+			 ISL7998x_REG_Px_DEC_CSC_CTL(page)),		\
+	regmap_reg_range(ISL7998x_REG_Px_DEC_BRIGHT(page),		\
+			 ISL7998x_REG_Px_DEC_HUE(page)),		\
+	regmap_reg_range(ISL7998x_REG_Px_DEC_VERT_PEAK(page),		\
+			 ISL7998x_REG_Px_DEC_CORING(page)),		\
+	regmap_reg_range(ISL7998x_REG_Px_DEC_SDT(page),			\
+			 ISL7998x_REG_Px_DEC_SDTR(page)),		\
+	regmap_reg_range(ISL7998x_REG_Px_DEC_CLMPG(page),		\
+			 ISL7998x_REG_Px_DEC_MISC3(page)),		\
+	regmap_reg_range(ISL7998x_REG_Px_DEC_CLMD(page),		\
+			 ISL7998x_REG_Px_DEC_DATA_CONV(page)),		\
+	regmap_reg_range(ISL7998x_REG_Px_DEC_INTERNAL_TEST(page),	\
+			 ISL7998x_REG_Px_DEC_INTERNAL_TEST(page)),	\
+	regmap_reg_range(ISL7998x_REG_Px_DEC_H_DELAY_CTL(page),		\
+			 ISL7998x_REG_Px_DEC_H_DELAY_II_LOW(page)),	\
+	/* ACA range */							\
+	regmap_reg_range(ISL7998x_REG_Px_ACA_CTL_1(page),		\
+			 ISL7998x_REG_Px_ACA_HIST_WIN_V_SZ2(page)),	\
+	regmap_reg_range(ISL7998x_REG_Px_ACA_CTL_2(page),		\
+			 ISL7998x_REG_Px_ACA_CTL_4(page)),		\
+	regmap_reg_range(ISL7998x_REG_Px_ACA_FLEX_WIN_HIST(page),	\
+			 ISL7998x_REG_Px_ACA_HIST_DATA_LO(page)),	\
+	regmap_reg_range(ISL7998x_REG_Px_ACA_XFER_HIST_HOST(page),	\
+			 ISL7998x_REG_Px_ACA_XFER_HIST_HOST(page)),	\
+	regmap_reg_range(ISL7998x_REG_Px_DEC_PAGE(page),		\
+			 ISL7998x_REG_Px_DEC_PAGE(page))
+
+#define ISL7998x_REG_DECODER_ACA_VOLATILE_RANGE(page)			\
+	/* Decoder range */						\
+	regmap_reg_range(ISL7998x_REG_Px_DEC_STATUS_1(page),		\
+			 ISL7998x_REG_Px_DEC_STATUS_1(page)),		\
+	regmap_reg_range(ISL7998x_REG_Px_DEC_SDT(page),			\
+			 ISL7998x_REG_Px_DEC_SDT(page)),		\
+	regmap_reg_range(ISL7998x_REG_Px_DEC_MVSN(page),		\
+			 ISL7998x_REG_Px_DEC_HFREF(page)),		\
+	/* ACA range */							\
+	regmap_reg_range(ISL7998x_REG_Px_ACA_Y_AVG(page),		\
+			 ISL7998x_REG_Px_ACA_Y_HIGH(page)),		\
+	regmap_reg_range(ISL7998x_REG_Px_ACA_HIST_DATA_LO(page),	\
+			 ISL7998x_REG_Px_ACA_FLEX_WIN_CR_CLR(page))
+
+static const struct regmap_range isl7998x_readable_ranges[] = {
+	regmap_reg_range(ISL7998x_REG_P0_PRODUCT_ID_CODE,
+			 ISL7998x_REG_P0_IRQ_SYNC_CTL),
+	regmap_reg_range(ISL7998x_REG_P0_INTERRUPT_STATUS,
+			 ISL7998x_REG_P0_CLOCK_DELAY),
+	regmap_reg_range(ISL7998x_REG_Px_DEC_PAGE(0),
+			 ISL7998x_REG_Px_DEC_PAGE(0)),
+
+	ISL7998x_REG_DECODER_ACA_READABLE_RANGE(1),
+	ISL7998x_REG_DECODER_ACA_READABLE_RANGE(2),
+	ISL7998x_REG_DECODER_ACA_READABLE_RANGE(3),
+	ISL7998x_REG_DECODER_ACA_READABLE_RANGE(4),
+
+	regmap_reg_range(ISL7998x_REG_P5_LI_ENGINE_CTL,
+			 ISL7998x_REG_P5_MIPI_SP_HS_TRL_CTL),
+	regmap_reg_range(ISL7998x_REG_P5_FIFO_THRSH_CNT_1,
+			 ISL7998x_REG_P5_PLL_ANA),
+	regmap_reg_range(ISL7998x_REG_P5_TOTAL_PF_LINE_CNT_1,
+			 ISL7998x_REG_P5_HIST_LINE_CNT_2),
+	regmap_reg_range(ISL7998x_REG_Px_DEC_PAGE(5),
+			 ISL7998x_REG_Px_DEC_PAGE(5)),
+};
+
+static const struct regmap_range isl7998x_writeable_ranges[] = {
+	regmap_reg_range(ISL7998x_REG_P0_SW_RESET_CTL,
+			 ISL7998x_REG_P0_IRQ_SYNC_CTL),
+	regmap_reg_range(ISL7998x_REG_P0_CHAN_1_IRQ,
+			 ISL7998x_REG_P0_SHORT_DIAG_IRQ_EN),
+	regmap_reg_range(ISL7998x_REG_P0_CLOCK_DELAY,
+			 ISL7998x_REG_P0_CLOCK_DELAY),
+	regmap_reg_range(ISL7998x_REG_Px_DEC_PAGE(0),
+			 ISL7998x_REG_Px_DEC_PAGE(0)),
+
+	ISL7998x_REG_DECODER_ACA_WRITEABLE_RANGE(1),
+	ISL7998x_REG_DECODER_ACA_WRITEABLE_RANGE(2),
+	ISL7998x_REG_DECODER_ACA_WRITEABLE_RANGE(3),
+	ISL7998x_REG_DECODER_ACA_WRITEABLE_RANGE(4),
+
+	regmap_reg_range(ISL7998x_REG_P5_LI_ENGINE_CTL,
+			 ISL7998x_REG_P5_ESC_MODE_TIME_CTL),
+	regmap_reg_range(ISL7998x_REG_P5_MIPI_SP_HS_TRL_CTL,
+			 ISL7998x_REG_P5_PLL_ANA),
+	regmap_reg_range(ISL7998x_REG_P5_TOTAL_PF_LINE_CNT_1,
+			 ISL7998x_REG_P5_HIST_LINE_CNT_2),
+	regmap_reg_range(ISL7998x_REG_Px_DEC_PAGE(5),
+			 ISL7998x_REG_Px_DEC_PAGE(5)),
+
+	ISL7998x_REG_DECODER_ACA_WRITEABLE_RANGE(0xf),
+};
+
+static const struct regmap_range isl7998x_volatile_ranges[] = {
+	/* Product id code register is used to check availability */
+	regmap_reg_range(ISL7998x_REG_P0_PRODUCT_ID_CODE,
+			 ISL7998x_REG_P0_PRODUCT_ID_CODE),
+	regmap_reg_range(ISL7998x_REG_P0_MPP1_SYNC_CTL,
+			 ISL7998x_REG_P0_IRQ_SYNC_CTL),
+	regmap_reg_range(ISL7998x_REG_P0_INTERRUPT_STATUS,
+			 ISL7998x_REG_P0_INTERRUPT_STATUS),
+	regmap_reg_range(ISL7998x_REG_P0_CHAN_1_STATUS,
+			 ISL7998x_REG_P0_SHORT_DIAG_STATUS),
+
+	ISL7998x_REG_DECODER_ACA_VOLATILE_RANGE(1),
+	ISL7998x_REG_DECODER_ACA_VOLATILE_RANGE(2),
+	ISL7998x_REG_DECODER_ACA_VOLATILE_RANGE(3),
+	ISL7998x_REG_DECODER_ACA_VOLATILE_RANGE(4),
+
+	regmap_reg_range(ISL7998x_REG_P5_AUTO_TEST_ERR_DET,
+			 ISL7998x_REG_P5_PIC_HEIGHT_LOW),
+};
+
+static const struct regmap_access_table isl7998x_readable_table = {
+	.yes_ranges = isl7998x_readable_ranges,
+	.n_yes_ranges = ARRAY_SIZE(isl7998x_readable_ranges),
+};
+
+static const struct regmap_access_table isl7998x_writeable_table = {
+	.yes_ranges = isl7998x_writeable_ranges,
+	.n_yes_ranges = ARRAY_SIZE(isl7998x_writeable_ranges),
+};
+
+static const struct regmap_access_table isl7998x_volatile_table = {
+	.yes_ranges = isl7998x_volatile_ranges,
+	.n_yes_ranges = ARRAY_SIZE(isl7998x_volatile_ranges),
+};
+
+static const struct regmap_range_cfg isl7998x_ranges[] = {
+	{
+		.range_min	= ISL7998x_REG_Pn_BASE(0),
+		.range_max	= ISL7998x_REG_Px_ACA_XFER_HIST_HOST(0xf),
+		.selector_reg	= ISL7998x_REG_Px_DEC_PAGE(0),
+		.selector_mask	= ISL7998x_REG_Px_DEC_PAGE_MASK,
+		.window_start	= 0,
+		.window_len	= 256,
+	}
+};
+
+static const struct regmap_config isl7998x_regmap = {
+	.reg_bits	= 8,
+	.val_bits	= 8,
+	.max_register	= ISL7998x_REG_Px_ACA_XFER_HIST_HOST(0xf),
+	.ranges		= isl7998x_ranges,
+	.num_ranges	= ARRAY_SIZE(isl7998x_ranges),
+	.rd_table	= &isl7998x_readable_table,
+	.wr_table	= &isl7998x_writeable_table,
+	.volatile_table	= &isl7998x_volatile_table,
+	.cache_type	= REGCACHE_RBTREE,
+};
+
+static int isl7998x_mc_init(struct isl7998x *isl7998x)
+{
+	unsigned int i;
+
+	isl7998x->subdev.entity.ops = &isl7998x_entity_ops;
+	isl7998x->subdev.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
+
+	isl7998x->pads[ISL7998x_PAD_OUT].flags = MEDIA_PAD_FL_SOURCE;
+	for (i = ISL7998x_PAD_VIN1; i < ISL7998x_NUM_PADS; i++)
+		isl7998x->pads[i].flags = MEDIA_PAD_FL_SINK;
+
+	return media_entity_pads_init(&isl7998x->subdev.entity,
+				      ISL7998x_NUM_PADS,
+				      isl7998x->pads);
+}
+
+static int get_link_freq_menu_index(unsigned int lanes,
+				    unsigned int inputs)
+{
+	int ret = -EINVAL;
+
+	switch (lanes) {
+	case 1:
+		if (inputs == 1)
+			ret = 0;
+		if (inputs == 2)
+			ret = 1;
+		if (inputs == 4)
+			ret = 2;
+		break;
+	case 2:
+		if (inputs == 2)
+			ret = 0;
+		if (inputs == 4)
+			ret = 1;
+		break;
+	default:
+		break;
+	}
+
+	return ret;
+}
+
+static int isl7998x_init_controls(struct isl7998x *isl7998x)
+{
+	struct v4l2_subdev *sd = &isl7998x->subdev;
+	int link_freq_index;
+	unsigned int i;
+	int ret;
+
+	ret = v4l2_ctrl_handler_init(&isl7998x->ctrl_handler,
+				     2 + ARRAY_SIZE(isl7998x_ctrls));
+	if (ret)
+		return ret;
+
+	mutex_init(&isl7998x->ctrl_mutex);
+	isl7998x->ctrl_handler.lock = &isl7998x->ctrl_mutex;
+	link_freq_index = get_link_freq_menu_index(isl7998x->nr_mipi_lanes,
+						   isl7998x->nr_inputs);
+	if (link_freq_index < 0 ||
+	    link_freq_index >= ARRAY_SIZE(link_freq_menu_items)) {
+		dev_err(sd->dev,
+			"failed to find MIPI link freq: %d lanes, %d inputs\n",
+			isl7998x->nr_mipi_lanes, isl7998x->nr_inputs);
+		ret = -EINVAL;
+		goto err;
+	}
+
+	isl7998x->link_freq = v4l2_ctrl_new_int_menu(&isl7998x->ctrl_handler,
+						     &isl7998x_ctrl_ops,
+						     V4L2_CID_LINK_FREQ,
+						     ARRAY_SIZE(link_freq_menu_items) - 1,
+						     link_freq_index,
+						     link_freq_menu_items);
+	if (isl7998x->link_freq)
+		isl7998x->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;
+
+	for (i = 0; i < ARRAY_SIZE(isl7998x_ctrls); i++)
+		v4l2_ctrl_new_custom(&isl7998x->ctrl_handler,
+				     &isl7998x_ctrls[i], NULL);
+
+	v4l2_ctrl_new_std_menu_items(&isl7998x->ctrl_handler,
+				     &isl7998x_ctrl_ops,
+				     V4L2_CID_TEST_PATTERN,
+				     ARRAY_SIZE(isl7998x_test_pattern_menu) - 1,
+				     0, 0, isl7998x_test_pattern_menu);
+
+	ret = isl7998x->ctrl_handler.error;
+	if (ret)
+		goto err;
+
+	isl7998x->subdev.ctrl_handler = &isl7998x->ctrl_handler;
+	v4l2_ctrl_handler_setup(&isl7998x->ctrl_handler);
+
+	return 0;
+
+err:
+	mutex_destroy(&isl7998x->ctrl_mutex);
+
+	return ret;
+}
+
+static void isl7998x_remove_controls(struct isl7998x *isl7998x)
+{
+	v4l2_ctrl_handler_free(isl7998x->subdev.ctrl_handler);
+	mutex_destroy(&isl7998x->ctrl_mutex);
+}
+
+static int isl7998x_probe(struct i2c_client *client)
+{
+	struct device *dev = &client->dev;
+	struct v4l2_fwnode_endpoint endpoint = {
+		.bus_type = V4L2_MBUS_CSI2_DPHY,
+	};
+	struct fwnode_handle *ep;
+	struct isl7998x *isl7998x;
+	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
+	int nr_inputs;
+	int ret;
+
+	ret = i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA);
+	if (!ret) {
+		dev_warn(&adapter->dev,
+			 "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
+		return -EIO;
+	}
+
+	isl7998x = devm_kzalloc(dev, sizeof(*isl7998x), GFP_KERNEL);
+	if (!isl7998x)
+		return -ENOMEM;
+
+	isl7998x->pd_gpio = devm_gpiod_get_optional(dev, "powerdown",
+						    GPIOD_OUT_HIGH);
+	if (IS_ERR(isl7998x->pd_gpio))
+		return dev_err_probe(dev, PTR_ERR(isl7998x->pd_gpio),
+				     "Failed to retrieve/request PD GPIO\n");
+
+	isl7998x->rstb_gpio = devm_gpiod_get_optional(dev, "reset",
+						      GPIOD_OUT_HIGH);
+	if (IS_ERR(isl7998x->rstb_gpio))
+		return dev_err_probe(dev, PTR_ERR(isl7998x->rstb_gpio),
+				     "Failed to retrieve/request RSTB GPIO\n");
+
+	isl7998x->regmap = devm_regmap_init_i2c(client, &isl7998x_regmap);
+	if (IS_ERR(isl7998x->regmap))
+		return dev_err_probe(dev, PTR_ERR(isl7998x->regmap),
+				     "Failed to allocate register map\n");
+
+	ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev),
+					     ISL7998x_PAD_OUT, 0, 0);
+	if (!ep)
+		return dev_err_probe(dev, -EINVAL, "Missing endpoint node\n");
+
+	ret = v4l2_fwnode_endpoint_parse(ep, &endpoint);
+	fwnode_handle_put(ep);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to parse endpoint\n");
+
+	if (endpoint.bus.mipi_csi2.num_data_lanes == 0 ||
+	    endpoint.bus.mipi_csi2.num_data_lanes > 2)
+		return dev_err_probe(dev, -EINVAL,
+				     "Invalid number of MIPI lanes\n");
+
+	isl7998x->nr_mipi_lanes = endpoint.bus.mipi_csi2.num_data_lanes;
+
+	nr_inputs = isl7998x_get_nr_inputs(dev->of_node);
+	if (nr_inputs < 0)
+		return dev_err_probe(dev, nr_inputs,
+				     "Invalid number of input ports\n");
+	isl7998x->nr_inputs = nr_inputs;
+
+	v4l2_i2c_subdev_init(&isl7998x->subdev, client, &isl7998x_subdev_ops);
+	isl7998x->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+
+	ret = isl7998x_mc_init(isl7998x);
+	if (ret < 0)
+		return ret;
+
+	isl7998x->mode = &supported_modes[0];
+	isl7998x->fmt = &isl7998x_colour_fmts[0];
+
+	ret = isl7998x_init_controls(isl7998x);
+	if (ret)
+		goto err_entity_cleanup;
+
+	ret = v4l2_async_register_subdev(&isl7998x->subdev);
+	if (ret < 0)
+		goto err_controls_cleanup;
+
+	pm_runtime_enable(dev);
+
+	ret = isl7998x_update_std(isl7998x);
+	if (ret)
+		goto err_init_cleanup;
+
+	return 0;
+
+err_init_cleanup:
+	pm_runtime_disable(dev);
+	v4l2_async_unregister_subdev(&isl7998x->subdev);
+err_controls_cleanup:
+	isl7998x_remove_controls(isl7998x);
+err_entity_cleanup:
+	media_entity_cleanup(&isl7998x->subdev.entity);
+
+	return ret;
+}
+
+static int isl7998x_remove(struct i2c_client *client)
+{
+	struct isl7998x *isl7998x = i2c_to_isl7998x(client);
+
+	pm_runtime_disable(&client->dev);
+	v4l2_async_unregister_subdev(&isl7998x->subdev);
+	isl7998x_remove_controls(isl7998x);
+	media_entity_cleanup(&isl7998x->subdev.entity);
+
+	return 0;
+}
+
+static const struct of_device_id isl7998x_of_match[] = {
+	{ .compatible = "isil,isl79987", },
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, isl7998x_of_match);
+
+static const struct i2c_device_id isl7998x_id[] = {
+	{ "isl79987", 0 },
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(i2c, isl7998x_id);
+
+static int __maybe_unused isl7998x_runtime_resume(struct device *dev)
+{
+	struct v4l2_subdev *sd = dev_get_drvdata(dev);
+	struct isl7998x *isl7998x = sd_to_isl7998x(sd);
+	int ret;
+
+	gpiod_set_value(isl7998x->rstb_gpio, 1);
+	gpiod_set_value(isl7998x->pd_gpio, 0);
+	gpiod_set_value(isl7998x->rstb_gpio, 0);
+
+	ret = isl7998x_wait_power_on(isl7998x);
+	if (ret)
+		goto err;
+
+	return isl7998x_init(isl7998x);
+
+err:
+	gpiod_set_value(isl7998x->pd_gpio, 1);
+
+	return ret;
+}
+
+static int __maybe_unused isl7998x_runtime_suspend(struct device *dev)
+{
+	struct v4l2_subdev *sd = dev_get_drvdata(dev);
+	struct isl7998x *isl7998x = sd_to_isl7998x(sd);
+
+	gpiod_set_value(isl7998x->pd_gpio, 1);
+
+	return 0;
+}
+
+static const struct dev_pm_ops isl7998x_pm_ops = {
+	SET_RUNTIME_PM_OPS(isl7998x_runtime_suspend,
+			   isl7998x_runtime_resume,
+			   NULL)
+};
+
+static struct i2c_driver isl7998x_i2c_driver = {
+	.driver = {
+		.name = "isl7998x",
+		.of_match_table = of_match_ptr(isl7998x_of_match),
+		.pm = &isl7998x_pm_ops,
+	},
+	.probe_new	= isl7998x_probe,
+	.remove		= isl7998x_remove,
+	.id_table	= isl7998x_id,
+};
+
+module_i2c_driver(isl7998x_i2c_driver);
+
+MODULE_DESCRIPTION("Intersil ISL7998x Analog to MIPI CSI-2/BT656 decoder");
+MODULE_AUTHOR("Marek Vasut <[e-mail]>");
+MODULE_LICENSE("GPL v2");