[v3,2/3] media: i2c: Add IMX290 CMOS image sensor driver
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Message ID 20190830091943.22646-3-manivannan.sadhasivam@linaro.org
State New
Headers show
Series
  • Add IMX290 CMOS image sensor support
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Commit Message

Manivannan Sadhasivam Aug. 30, 2019, 9:19 a.m. UTC
Add driver for Sony IMX290 CMOS image sensor driver. The driver only
supports I2C interface for programming and MIPI CSI-2 for sensor output.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 drivers/media/i2c/Kconfig  |  11 +
 drivers/media/i2c/Makefile |   1 +
 drivers/media/i2c/imx290.c | 881 +++++++++++++++++++++++++++++++++++++
 3 files changed, 893 insertions(+)
 create mode 100644 drivers/media/i2c/imx290.c

Comments

Sakari Ailus Sept. 23, 2019, 9:22 a.m. UTC | #1
Hi Manivannan,

On Fri, Aug 30, 2019 at 02:49:42PM +0530, Manivannan Sadhasivam wrote:
> Add driver for Sony IMX290 CMOS image sensor driver. The driver only
> supports I2C interface for programming and MIPI CSI-2 for sensor output.
> 
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> ---
>  drivers/media/i2c/Kconfig  |  11 +
>  drivers/media/i2c/Makefile |   1 +
>  drivers/media/i2c/imx290.c | 881 +++++++++++++++++++++++++++++++++++++
>  3 files changed, 893 insertions(+)
>  create mode 100644 drivers/media/i2c/imx290.c
> 
> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> index 79ce9ec6fc1b..4ebb80b18748 100644
> --- a/drivers/media/i2c/Kconfig
> +++ b/drivers/media/i2c/Kconfig
> @@ -595,6 +595,17 @@ config VIDEO_IMX274
>  	  This is a V4L2 sensor driver for the Sony IMX274
>  	  CMOS image sensor.
>  
> +config VIDEO_IMX290
> +	tristate "Sony IMX290 sensor support"
> +	depends on I2C && VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API
> +	depends on MEDIA_CAMERA_SUPPORT

Please drop this line. It will be redundant very soon.

> +	help
> +	  This is a Video4Linux2 sensor driver for the Sony
> +	  IMX290 camera sensor.
> +
> +	  To compile this driver as a module, choose M here: the
> +	  module will be called imx290.
> +
>  config VIDEO_IMX319
>  	tristate "Sony IMX319 sensor support"
>  	depends on I2C && VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API
> diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
> index fd4ea86dedd5..04411ddb4922 100644
> --- a/drivers/media/i2c/Makefile
> +++ b/drivers/media/i2c/Makefile
> @@ -111,6 +111,7 @@ obj-$(CONFIG_VIDEO_TC358743)	+= tc358743.o
>  obj-$(CONFIG_VIDEO_IMX214)	+= imx214.o
>  obj-$(CONFIG_VIDEO_IMX258)	+= imx258.o
>  obj-$(CONFIG_VIDEO_IMX274)	+= imx274.o
> +obj-$(CONFIG_VIDEO_IMX290)	+= imx290.o
>  obj-$(CONFIG_VIDEO_IMX319)	+= imx319.o
>  obj-$(CONFIG_VIDEO_IMX355)	+= imx355.o
>  obj-$(CONFIG_VIDEO_ST_MIPID02) += st-mipid02.o
> diff --git a/drivers/media/i2c/imx290.c b/drivers/media/i2c/imx290.c
> new file mode 100644
> index 000000000000..db5bb0d69eb8
> --- /dev/null
> +++ b/drivers/media/i2c/imx290.c
> @@ -0,0 +1,881 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Sony IMX290 CMOS Image Sensor Driver
> + *
> + * Copyright (C) 2019 FRAMOS GmbH.
> + *
> + * Copyright (C) 2019 Linaro Ltd.
> + * Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/i2c.h>
> +#include <linux/module.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/regmap.h>
> +#include <linux/regulator/consumer.h>
> +#include <media/media-entity.h>
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-fwnode.h>
> +#include <media/v4l2-subdev.h>
> +
> +#define IMX290_STANDBY 0x3000
> +#define IMX290_REGHOLD 0x3001
> +#define IMX290_XMSTA 0x3002
> +#define IMX290_GAIN 0x3014
> +
> +#define IMX290_DEFAULT_LINK_FREQ 445500000
> +
> +static const char * const imx290_supply_name[] = {
> +	"vdda",
> +	"vddd",
> +	"vdddo",
> +};
> +
> +#define IMX290_NUM_SUPPLIES ARRAY_SIZE(imx290_supply_name)
> +
> +struct imx290_regval {
> +	u16 reg;
> +	u8 val;
> +};
> +
> +struct imx290_mode {
> +	u32 width;
> +	u32 height;
> +	u32 pixel_rate;
> +	u32 link_freq_index;
> +
> +	const struct imx290_regval *data;
> +	u32 data_size;
> +};
> +
> +struct imx290 {
> +	struct device *dev;
> +	struct clk *xclk;
> +	struct regmap *regmap;
> +
> +	struct v4l2_subdev sd;
> +	struct v4l2_fwnode_endpoint ep;
> +	struct media_pad pad;
> +	struct v4l2_mbus_framefmt current_format;
> +	const struct imx290_mode *current_mode;
> +
> +	struct regulator_bulk_data supplies[IMX290_NUM_SUPPLIES];
> +	struct gpio_desc *rst_gpio;
> +
> +	struct v4l2_ctrl_handler ctrls;
> +	struct v4l2_ctrl *link_freq;
> +	struct v4l2_ctrl *pixel_rate;
> +
> +	struct mutex lock;
> +};
> +
> +struct imx290_pixfmt {
> +	u32 code;
> +};
> +
> +static const struct imx290_pixfmt imx290_formats[] = {
> +	{ MEDIA_BUS_FMT_SRGGB10_1X10 },

You have a single format here. You don't need the entire array, do you?

Unless you have plans to add more, that is.

> +};
> +
> +static struct regmap_config imx290_regmap_config = {
> +	.reg_bits = 16,
> +	.val_bits = 8,
> +	.cache_type = REGCACHE_RBTREE,
> +};
> +
> +static const struct imx290_regval imx290_global_init_settings[] = {
> +	{ 0x3007, 0x00 },
> +	{ 0x3009, 0x00 },
> +	{ 0x3018, 0x65 },
> +	{ 0x3019, 0x04 },
> +	{ 0x301a, 0x00 },
> +	{ 0x3443, 0x03 },
> +	{ 0x3444, 0x20 },
> +	{ 0x3445, 0x25 },
> +	{ 0x3407, 0x03 },
> +	{ 0x303a, 0x0c },
> +	{ 0x3040, 0x00 },
> +	{ 0x3041, 0x00 },
> +	{ 0x303c, 0x00 },
> +	{ 0x303d, 0x00 },
> +	{ 0x3042, 0x9c },
> +	{ 0x3043, 0x07 },
> +	{ 0x303e, 0x49 },
> +	{ 0x303f, 0x04 },
> +	{ 0x304b, 0x0a },
> +	{ 0x300f, 0x00 },
> +	{ 0x3010, 0x21 },
> +	{ 0x3012, 0x64 },
> +	{ 0x3016, 0x09 },
> +	{ 0x3070, 0x02 },
> +	{ 0x3071, 0x11 },
> +	{ 0x309b, 0x10 },
> +	{ 0x309c, 0x22 },
> +	{ 0x30a2, 0x02 },
> +	{ 0x30a6, 0x20 },
> +	{ 0x30a8, 0x20 },
> +	{ 0x30aa, 0x20 },
> +	{ 0x30ac, 0x20 },
> +	{ 0x30b0, 0x43 },
> +	{ 0x3119, 0x9e },
> +	{ 0x311c, 0x1e },
> +	{ 0x311e, 0x08 },
> +	{ 0x3128, 0x05 },
> +	{ 0x313d, 0x83 },
> +	{ 0x3150, 0x03 },
> +	{ 0x317e, 0x00 },
> +	{ 0x32b8, 0x50 },
> +	{ 0x32b9, 0x10 },
> +	{ 0x32ba, 0x00 },
> +	{ 0x32bb, 0x04 },
> +	{ 0x32c8, 0x50 },
> +	{ 0x32c9, 0x10 },
> +	{ 0x32ca, 0x00 },
> +	{ 0x32cb, 0x04 },
> +	{ 0x332c, 0xd3 },
> +	{ 0x332d, 0x10 },
> +	{ 0x332e, 0x0d },
> +	{ 0x3358, 0x06 },
> +	{ 0x3359, 0xe1 },
> +	{ 0x335a, 0x11 },
> +	{ 0x3360, 0x1e },
> +	{ 0x3361, 0x61 },
> +	{ 0x3362, 0x10 },
> +	{ 0x33b0, 0x50 },
> +	{ 0x33b2, 0x1a },
> +	{ 0x33b3, 0x04 },
> +};
> +
> +static const struct imx290_regval imx290_1080p_settings[] = {
> +	/* mode settings */
> +	{ 0x3007, 0x00 },
> +	{ 0x303a, 0x0c },
> +	{ 0x3414, 0x0a },
> +	{ 0x3472, 0x80 },
> +	{ 0x3473, 0x07 },
> +	{ 0x3418, 0x38 },
> +	{ 0x3419, 0x04 },
> +	{ 0x3012, 0x64 },
> +	{ 0x3013, 0x00 },
> +	{ 0x305c, 0x18 },
> +	{ 0x305d, 0x03 },
> +	{ 0x305e, 0x20 },
> +	{ 0x305f, 0x01 },
> +	{ 0x315e, 0x1a },
> +	{ 0x3164, 0x1a },
> +	{ 0x3480, 0x49 },
> +	/* data rate settings */
> +	{ 0x3009, 0x01 },
> +	{ 0x3405, 0x10 },
> +	{ 0x3446, 0x57 },
> +	{ 0x3447, 0x00 },
> +	{ 0x3448, 0x37 },
> +	{ 0x3449, 0x00 },
> +	{ 0x344a, 0x1f },
> +	{ 0x344b, 0x00 },
> +	{ 0x344c, 0x1f },
> +	{ 0x344d, 0x00 },
> +	{ 0x344e, 0x1f },
> +	{ 0x344f, 0x00 },
> +	{ 0x3450, 0x77 },
> +	{ 0x3451, 0x00 },
> +	{ 0x3452, 0x1f },
> +	{ 0x3453, 0x00 },
> +	{ 0x3454, 0x17 },
> +	{ 0x3455, 0x00 },
> +	{ 0x301c, 0x98 },
> +	{ 0x301d, 0x08 },
> +};
> +
> +static const struct imx290_regval imx290_720p_settings[] = {
> +	/* mode settings */
> +	{ 0x3007, 0x10 },
> +	{ 0x303a, 0x06 },
> +	{ 0x3414, 0x04 },
> +	{ 0x3472, 0x00 },
> +	{ 0x3473, 0x05 },
> +	{ 0x3418, 0xd0 },
> +	{ 0x3419, 0x02 },
> +	{ 0x3012, 0x64 },
> +	{ 0x3013, 0x00 },
> +	{ 0x305c, 0x20 },
> +	{ 0x305d, 0x00 },
> +	{ 0x305e, 0x20 },
> +	{ 0x305f, 0x01 },
> +	{ 0x315e, 0x1a },
> +	{ 0x3164, 0x1a },
> +	{ 0x3480, 0x49 },
> +	/* data rate settings */
> +	{ 0x3009, 0x01 },
> +	{ 0x3405, 0x10 },
> +	{ 0x3446, 0x4f },
> +	{ 0x3447, 0x00 },
> +	{ 0x3448, 0x2f },
> +	{ 0x3449, 0x00 },
> +	{ 0x344a, 0x17 },
> +	{ 0x344b, 0x00 },
> +	{ 0x344c, 0x17 },
> +	{ 0x344d, 0x00 },
> +	{ 0x344e, 0x17 },
> +	{ 0x344f, 0x00 },
> +	{ 0x3450, 0x57 },
> +	{ 0x3451, 0x00 },
> +	{ 0x3452, 0x17 },
> +	{ 0x3453, 0x00 },
> +	{ 0x3454, 0x17 },
> +	{ 0x3455, 0x00 },
> +	{ 0x301c, 0xe4 },
> +	{ 0x301d, 0x0c },
> +};
> +
> +static const struct imx290_regval imx290_10bit_settings[] = {
> +	{ 0x3005, 0x00},
> +	{ 0x3046, 0x00},
> +	{ 0x3129, 0x1d},
> +	{ 0x317c, 0x12},
> +	{ 0x31ec, 0x37},
> +	{ 0x3441, 0x0a},
> +	{ 0x3442, 0x0a},
> +	{ 0x300a, 0x3c},
> +	{ 0x300b, 0x00},
> +};
> +
> +/* supported link frequencies */
> +static const s64 imx290_link_freq[] = {
> +	IMX290_DEFAULT_LINK_FREQ,
> +};
> +
> +/* Mode configs */
> +static const struct imx290_mode imx290_modes[] = {
> +	{
> +		.width = 1920,
> +		.height = 1080,
> +		.data = imx290_1080p_settings,
> +		.data_size = ARRAY_SIZE(imx290_1080p_settings),
> +		.pixel_rate = 178200000,
> +		.link_freq_index = 0,
> +	},
> +	{
> +		.width = 1280,
> +		.height = 720,
> +		.data = imx290_720p_settings,
> +		.data_size = ARRAY_SIZE(imx290_720p_settings),
> +		.pixel_rate = 178200000,
> +		.link_freq_index = 0,
> +	},
> +};
> +
> +static inline struct imx290 *to_imx290(struct v4l2_subdev *_sd)
> +{
> +	return container_of(_sd, struct imx290, sd);
> +}
> +
> +static inline int imx290_read_reg(struct imx290 *imx290, u16 addr, u8 *value)
> +{
> +	u32 regval;

I don't remember for sure what I asked previously, but feel free to make
this unsigned int again. The third argument of regmap_read() is of that
type.

> +	int ret;
> +
> +	ret = regmap_read(imx290->regmap, addr, &regval);
> +	if (ret) {
> +		dev_err(imx290->dev, "I2C read failed for addr: %x\n", addr);
> +		return ret;
> +	}
> +
> +	*value = regval & 0xff;
> +
> +	return 0;
> +}
> +
> +static int imx290_write_reg(struct imx290 *imx290, u16 addr, u8 value)
> +{
> +	int ret;
> +
> +	ret = regmap_write(imx290->regmap, addr, value);
> +	if (ret) {
> +		dev_err(imx290->dev, "I2C write failed for addr: %x\n", addr);
> +		return ret;
> +	}
> +
> +	return ret;
> +}
> +
> +static int imx290_set_register_array(struct imx290 *imx290,
> +				     const struct imx290_regval *settings,
> +				     unsigned int num_settings)
> +{
> +	unsigned int i;
> +	int ret;
> +
> +	for (i = 0; i < num_settings; ++i, ++settings) {
> +		ret = imx290_write_reg(imx290, settings->reg, settings->val);
> +		if (ret < 0)
> +			return ret;
> +
> +		/* Settle time is 10ms for all registers */
> +		msleep(10);
> +	}
> +
> +	return 0;
> +}
> +
> +static int imx290_write_buffered_reg(struct imx290 *imx290, u16 address_low,
> +				     u8 nr_regs, u32 value)
> +{
> +	unsigned int i;
> +	int ret;
> +
> +	ret = imx290_write_reg(imx290, IMX290_REGHOLD, 0x01);
> +	if (ret) {
> +		dev_err(imx290->dev, "Error setting hold register\n");
> +		return ret;
> +	}
> +
> +	for (i = 0; i < nr_regs; i++) {
> +		ret = imx290_write_reg(imx290, address_low + i,
> +				       (u8)(value >> (i * 8)));
> +		if (ret) {
> +			dev_err(imx290->dev, "Error writing buffered registers\n");
> +			return ret;
> +		}
> +	}
> +
> +	ret = imx290_write_reg(imx290, IMX290_REGHOLD, 0x00);
> +	if (ret) {
> +		dev_err(imx290->dev, "Error setting hold register\n");
> +		return ret;
> +	}
> +
> +	return ret;
> +}
> +
> +static int imx290_set_gain(struct imx290 *imx290, u32 value)
> +{
> +	int ret;
> +
> +	u32 adjusted_value = (value * 10) / 3;

What's the purpose of this? Why not to use the value directly?

> +
> +	ret = imx290_write_buffered_reg(imx290, IMX290_GAIN, 1, adjusted_value);
> +	if (ret)
> +		dev_err(imx290->dev, "Unable to write gain\n");
> +
> +	return ret;
> +}
> +
> +static int imx290_set_power_on(struct imx290 *imx290)
> +{
> +	int ret;
> +
> +	ret = clk_prepare_enable(imx290->xclk);

Please move the code from this function to the runtime PM runtime suspend
callback. The same for imx290_set_power_off().

> +	if (ret) {
> +		dev_err(imx290->dev, "Failed to enable clock\n");
> +		return ret;
> +	}
> +
> +	ret = regulator_bulk_enable(IMX290_NUM_SUPPLIES,
> +				    imx290->supplies);

Fits on a single line.

> +	if (ret) {
> +		dev_err(imx290->dev, "Failed to enable regulators\n");
> +		goto xclk_off;
> +	}
> +
> +	usleep_range(1, 2);
> +	gpiod_set_value_cansleep(imx290->rst_gpio, 1);
> +	usleep_range(30000, 31000);
> +
> +	return 0;
> +
> +xclk_off:
> +	clk_disable_unprepare(imx290->xclk);
> +	return ret;
> +}
> +
> +/* Stop streaming */
> +static int imx290_stop_streaming(struct imx290 *imx290)
> +{
> +	int ret;
> +
> +	ret = imx290_write_reg(imx290, IMX290_STANDBY, 0x01);
> +	if (ret < 0)
> +		return ret;
> +
> +	msleep(30);
> +
> +	return imx290_write_reg(imx290, IMX290_XMSTA, 0x01);
> +}
> +
> +static void imx290_set_power_off(struct imx290 *imx290)
> +{
> +	clk_disable_unprepare(imx290->xclk);
> +	gpiod_set_value_cansleep(imx290->rst_gpio, 0);
> +	regulator_bulk_disable(IMX290_NUM_SUPPLIES, imx290->supplies);
> +}
> +
> +static int imx290_set_ctrl(struct v4l2_ctrl *ctrl)
> +{
> +	struct imx290 *imx290 = container_of(ctrl->handler,
> +					     struct imx290, ctrls);
> +	int ret = 0;
> +
> +	/* V4L2 controls values will be applied only when power is already up */
> +	if (!pm_runtime_get_if_in_use(imx290->dev))
> +		return 0;
> +
> +	switch (ctrl->id) {
> +	case V4L2_CID_GAIN:
> +		ret = imx290_set_gain(imx290, ctrl->val);
> +		break;
> +	default:
> +		ret = -EINVAL;
> +		break;
> +	}
> +
> +	pm_runtime_put(imx290->dev);
> +
> +	return ret;
> +}
> +
> +static const struct v4l2_ctrl_ops imx290_ctrl_ops = {
> +	.s_ctrl = imx290_set_ctrl,
> +};
> +
> +static int imx290_enum_mbus_code(struct v4l2_subdev *sd,
> +				 struct v4l2_subdev_pad_config *cfg,
> +				 struct v4l2_subdev_mbus_code_enum *code)
> +{
> +	if (code->index >= ARRAY_SIZE(imx290_formats))
> +		return -EINVAL;
> +
> +	code->code = imx290_formats[code->index].code;
> +
> +	return 0;
> +}
> +
> +static int imx290_get_fmt(struct v4l2_subdev *sd,
> +			  struct v4l2_subdev_pad_config *cfg,
> +			  struct v4l2_subdev_format *fmt)
> +{
> +	struct imx290 *imx290 = to_imx290(sd);
> +	struct v4l2_mbus_framefmt *framefmt;
> +
> +	mutex_lock(&imx290->lock);
> +
> +	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY)
> +		framefmt = v4l2_subdev_get_try_format(&imx290->sd, cfg,
> +						      fmt->pad);
> +	else
> +		framefmt = &imx290->current_format;
> +
> +	fmt->format = *framefmt;
> +
> +	mutex_unlock(&imx290->lock);
> +
> +	return 0;
> +}
> +
> +static int imx290_set_fmt(struct v4l2_subdev *sd,
> +			  struct v4l2_subdev_pad_config *cfg,
> +		      struct v4l2_subdev_format *fmt)
> +{
> +	struct imx290 *imx290 = to_imx290(sd);
> +	const struct imx290_mode *mode;
> +	struct v4l2_mbus_framefmt *format;
> +	int i, ret = 0;

unsigned int i

> +
> +	mutex_lock(&imx290->lock);
> +
> +	mode = v4l2_find_nearest_size(imx290_modes,
> +				      ARRAY_SIZE(imx290_modes),
> +				      width, height,
> +				      fmt->format.width, fmt->format.height);
> +
> +	fmt->format.width = mode->width;
> +	fmt->format.height = mode->height;
> +
> +	for (i = 0; i < ARRAY_SIZE(imx290_formats); i++)
> +		if (imx290_formats[i].code == fmt->format.code)
> +			break;
> +
> +	if (i >= ARRAY_SIZE(imx290_formats))
> +		i = 0;
> +
> +	fmt->format.code = imx290_formats[i].code;
> +	fmt->format.field = V4L2_FIELD_NONE;
> +
> +	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
> +		format = v4l2_subdev_get_try_format(sd, cfg, fmt->pad);
> +	} else {
> +		format = &imx290->current_format;
> +		__v4l2_ctrl_s_ctrl(imx290->link_freq, mode->link_freq_index);
> +		__v4l2_ctrl_s_ctrl_int64(imx290->pixel_rate, mode->pixel_rate);
> +
> +		imx290->current_mode = mode;
> +	}
> +
> +	*format = fmt->format;
> +
> +	mutex_unlock(&imx290->lock);
> +
> +	return ret;
> +}
> +
> +static int imx290_entity_init_cfg(struct v4l2_subdev *subdev,
> +				  struct v4l2_subdev_pad_config *cfg)
> +{
> +	struct v4l2_subdev_format fmt = { 0 };
> +
> +	fmt.which = cfg ? V4L2_SUBDEV_FORMAT_TRY : V4L2_SUBDEV_FORMAT_ACTIVE;
> +	fmt.format.width = 1920;
> +	fmt.format.height = 1080;
> +
> +	imx290_set_fmt(subdev, cfg, &fmt);
> +
> +	return 0;
> +}
> +
> +static int imx290_write_current_format(struct imx290 *imx290,
> +				       struct v4l2_mbus_framefmt *format)
> +{
> +	int ret;
> +
> +	switch (format->code) {
> +	case MEDIA_BUS_FMT_SRGGB10_1X10:
> +		ret = imx290_set_register_array(imx290, imx290_10bit_settings,
> +					ARRAY_SIZE(imx290_10bit_settings));

Indentation.

> +		if (ret < 0) {
> +			dev_err(imx290->dev, "Could not set format registers\n");
> +			return ret;
> +		}
> +		break;
> +	default:
> +		dev_err(imx290->dev, "Unknown pixel format\n");
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +/* Start streaming */
> +static int imx290_start_streaming(struct imx290 *imx290)
> +{
> +	int ret;
> +
> +	/* Set init register settings */
> +	ret = imx290_set_register_array(imx290, imx290_global_init_settings,
> +				ARRAY_SIZE(imx290_global_init_settings));
> +	if (ret < 0) {
> +		dev_err(imx290->dev, "Could not set init registers\n");
> +		return ret;
> +	}
> +
> +	/* Set current frame format */
> +	ret = imx290_write_current_format(imx290, &imx290->current_format);
> +	if (ret < 0) {
> +		dev_err(imx290->dev, "Could not set frame format\n");
> +		return ret;
> +	}
> +
> +	/* Apply default values of current mode */
> +	ret = imx290_set_register_array(imx290, imx290->current_mode->data,
> +					imx290->current_mode->data_size);
> +	if (ret < 0) {
> +		dev_err(imx290->dev, "Could not set current mode\n");
> +		return ret;
> +	}
> +
> +	/* Apply customized values from user */
> +	ret = v4l2_ctrl_handler_setup(imx290->sd.ctrl_handler);
> +	if (ret) {
> +		dev_err(imx290->dev, "Could not sync v4l2 controls\n");
> +		return ret;
> +	}
> +
> +	ret = imx290_write_reg(imx290, IMX290_STANDBY, 0x00);
> +	if (ret < 0)
> +		return ret;
> +
> +	msleep(30);
> +
> +	/* Start streaming */
> +	return imx290_write_reg(imx290, IMX290_XMSTA, 0x00);
> +}
> +
> +static int imx290_set_stream(struct v4l2_subdev *sd, int enable)
> +{
> +	struct imx290 *imx290 = to_imx290(sd);
> +	int ret = 0;
> +
> +	if (enable) {
> +		ret = pm_runtime_get_sync(imx290->dev);
> +		if (ret < 0) {
> +			pm_runtime_put_noidle(imx290->dev);
> +			goto unlock_and_return;
> +		}
> +
> +		ret = imx290_start_streaming(imx290);
> +		if (ret) {
> +			dev_err(imx290->dev, "Start stream failed\n");
> +			pm_runtime_put(imx290->dev);
> +			goto unlock_and_return;
> +		}
> +	} else {
> +		imx290_stop_streaming(imx290);
> +		pm_runtime_put(imx290->dev);
> +	}
> +
> +unlock_and_return:
> +
> +	return ret;
> +}
> +
> +static int imx290_get_regulators(struct device *dev, struct imx290 *imx290)
> +{
> +	unsigned int i;
> +
> +	for (i = 0; i < IMX290_NUM_SUPPLIES; i++)
> +		imx290->supplies[i].supply = imx290_supply_name[i];
> +
> +	return devm_regulator_bulk_get(dev, IMX290_NUM_SUPPLIES,
> +				       imx290->supplies);
> +}
> +
> +static int __maybe_unused imx290_runtime_resume(struct device *dev)
> +{
> +	struct i2c_client *client = to_i2c_client(dev);
> +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> +	struct imx290 *imx290 = to_imx290(sd);
> +
> +	return imx290_set_power_on(imx290);
> +}
> +
> +static int __maybe_unused imx290_runtime_suspend(struct device *dev)
> +{
> +	struct i2c_client *client = to_i2c_client(dev);
> +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> +	struct imx290 *imx290 = to_imx290(sd);
> +
> +	imx290_set_power_off(imx290);
> +
> +	return 0;
> +}
> +
> +static const struct dev_pm_ops imx290_pm_ops = {
> +	SET_RUNTIME_PM_OPS(imx290_runtime_suspend,
> +			   imx290_runtime_resume, NULL)

Fits on a single line.

> +};
> +
> +static const struct v4l2_subdev_video_ops imx290_video_ops = {
> +	.s_stream = imx290_set_stream,
> +};
> +
> +static const struct v4l2_subdev_pad_ops imx290_pad_ops = {
> +	.init_cfg = imx290_entity_init_cfg,
> +	.enum_mbus_code = imx290_enum_mbus_code,
> +	.get_fmt = imx290_get_fmt,
> +	.set_fmt = imx290_set_fmt,
> +};
> +
> +static const struct v4l2_subdev_ops imx290_subdev_ops = {
> +	.video = &imx290_video_ops,
> +	.pad = &imx290_pad_ops,
> +};
> +
> +static const struct media_entity_operations imx290_subdev_entity_ops = {
> +	.link_validate = v4l2_subdev_link_validate,
> +};
> +
> +static int imx290_probe(struct i2c_client *client)
> +{
> +	struct device *dev = &client->dev;
> +	struct fwnode_handle *endpoint;
> +	struct imx290 *imx290;
> +	u32 xclk_freq;
> +	int ret;
> +
> +	imx290 = devm_kzalloc(dev, sizeof(*imx290), GFP_KERNEL);
> +	if (!imx290)
> +		return -ENOMEM;
> +
> +	imx290->dev = dev;
> +	imx290->regmap = devm_regmap_init_i2c(client, &imx290_regmap_config);
> +	if (IS_ERR(imx290->regmap)) {
> +		dev_err(dev, "Unable to initialize I2C\n");
> +		return -ENODEV;
> +	}
> +
> +	endpoint = fwnode_graph_get_next_endpoint(dev_fwnode(dev), NULL);
> +	if (!endpoint) {
> +		dev_err(dev, "Endpoint node not found\n");
> +		return -EINVAL;
> +	}
> +
> +	ret = v4l2_fwnode_endpoint_alloc_parse(endpoint, &imx290->ep);

You're missing v4l2_fwnode_endpoint_free() below, both in error handling as
for the successful case.

> +	fwnode_handle_put(endpoint);
> +	if (ret) {
> +		dev_err(dev, "Parsing endpoint node failed\n");
> +		return ret;
> +	}
> +
> +	if (!imx290->ep.nr_of_link_frequencies) {
> +		dev_err(dev, "link-frequency property not found in DT\n");
> +		return -EINVAL;
> +	}
> +
> +	if (imx290->ep.link_frequencies[0] != IMX290_DEFAULT_LINK_FREQ) {
> +		dev_err(dev, "Unsupported link frequency\n");
> +		return -EINVAL;
> +	}
> +
> +	/* Only CSI2 is supported for now */
> +	if (imx290->ep.bus_type != V4L2_MBUS_CSI2_DPHY) {
> +		dev_err(dev, "Unsupported bus type, should be CSI2\n");
> +		return -EINVAL;
> +	}
> +
> +	/* Set default mode to max resolution */
> +	imx290->current_mode = &imx290_modes[0];
> +
> +	/* get system clock (xclk) */
> +	imx290->xclk = devm_clk_get(dev, "xclk");
> +	if (IS_ERR(imx290->xclk)) {
> +		dev_err(dev, "Could not get xclk");
> +		return PTR_ERR(imx290->xclk);
> +	}
> +
> +	ret = of_property_read_u32(dev->of_node, "clock-frequency", &xclk_freq);

You're using the fwnode API elsewhere in the driver; please use
fwnode_property_read_u32() here, too.

> +	if (ret) {
> +		dev_err(dev, "Could not get xclk frequency\n");
> +		return ret;
> +	}
> +
> +	/* external clock must be 37.125 MHz */
> +	if (xclk_freq != 37125000) {
> +		dev_err(dev, "External clock frequency %u is not supported\n",
> +			xclk_freq);
> +		return -EINVAL;
> +	}
> +
> +	ret = clk_set_rate(imx290->xclk, xclk_freq);
> +	if (ret) {
> +		dev_err(dev, "Could not set xclk frequency\n");
> +		return ret;
> +	}
> +
> +	ret = imx290_get_regulators(dev, imx290);
> +	if (ret < 0) {
> +		dev_err(dev, "Cannot get regulators\n");
> +		return ret;
> +	}
> +
> +	imx290->rst_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_ASIS);
> +	if (IS_ERR(imx290->rst_gpio)) {
> +		dev_err(dev, "Cannot get reset gpio\n");
> +		return PTR_ERR(imx290->rst_gpio);
> +	}
> +
> +	mutex_init(&imx290->lock);
> +
> +	v4l2_ctrl_handler_init(&imx290->ctrls, 3);
> +
> +	v4l2_ctrl_new_std(&imx290->ctrls, &imx290_ctrl_ops,
> +			  V4L2_CID_GAIN, 0, 72, 1, 0);
> +	imx290->link_freq = v4l2_ctrl_new_int_menu(&imx290->ctrls,
> +					&imx290_ctrl_ops,
> +					V4L2_CID_LINK_FREQ,
> +					ARRAY_SIZE(imx290_link_freq) - 1,
> +					0, imx290_link_freq);
> +	if (imx290->link_freq)
> +		imx290->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;
> +
> +	imx290->pixel_rate = v4l2_ctrl_new_std(&imx290->ctrls, &imx290_ctrl_ops,
> +					       V4L2_CID_PIXEL_RATE, 1,
> +					       INT_MAX, 1,
> +					       imx290_modes[0].pixel_rate);
> +
> +	imx290->sd.ctrl_handler = &imx290->ctrls;
> +
> +	if (imx290->ctrls.error) {
> +		dev_err(dev, "Control initialization error %d\n",
> +			imx290->ctrls.error);
> +		ret = imx290->ctrls.error;
> +		goto free_ctrl;
> +	}
> +
> +	v4l2_i2c_subdev_init(&imx290->sd, client, &imx290_subdev_ops);
> +	imx290->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> +	imx290->sd.dev = &client->dev;
> +	imx290->sd.entity.ops = &imx290_subdev_entity_ops;
> +	imx290->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
> +
> +	imx290->pad.flags = MEDIA_PAD_FL_SOURCE;
> +	ret = media_entity_pads_init(&imx290->sd.entity, 1, &imx290->pad);
> +	if (ret < 0) {
> +		dev_err(dev, "Could not register media entity\n");
> +		goto free_ctrl;
> +	}
> +
> +	ret = v4l2_async_register_subdev(&imx290->sd);
> +	if (ret < 0) {
> +		dev_err(dev, "Could not register v4l2 device\n");
> +		goto free_entity;
> +	}
> +
> +	pm_runtime_set_active(dev);
> +	pm_runtime_enable(dev);

Here, runtime PM's idea of your device's power state is that it's powered
on. You'll need to manually call the function doing that before you're
here. Otherewise there's a chance that the device will be powered off when
the first use tries to access it. See e.g. the smiapp driver for an
example.

> +	pm_runtime_idle(dev);
> +
> +	return 0;
> +
> +free_entity:
> +	media_entity_cleanup(&imx290->sd.entity);
> +free_ctrl:
> +	v4l2_ctrl_handler_free(&imx290->ctrls);
> +	mutex_destroy(&imx290->lock);
> +
> +	return ret;
> +}
> +
> +static int imx290_remove(struct i2c_client *client)
> +{
> +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> +	struct imx290 *imx290 = to_imx290(sd);
> +
> +	v4l2_async_unregister_subdev(sd);
> +	media_entity_cleanup(&sd->entity);
> +	v4l2_ctrl_handler_free(sd->ctrl_handler);
> +
> +	mutex_destroy(&imx290->lock);
> +
> +	pm_runtime_disable(imx290->dev);
> +	if (!pm_runtime_status_suspended(imx290->dev))
> +		imx290_set_power_off(imx290);
> +	pm_runtime_set_suspended(imx290->dev);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id imx290_of_match[] = {
> +	{ .compatible = "sony,imx290" },
> +	{ /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, imx290_of_match);
> +
> +static struct i2c_driver imx290_i2c_driver = {
> +	.probe_new  = imx290_probe,
> +	.remove = imx290_remove,
> +	.driver = {
> +		.name  = "imx290",
> +		.pm = &imx290_pm_ops,
> +		.of_match_table = of_match_ptr(imx290_of_match),
> +	},
> +};
> +
> +module_i2c_driver(imx290_i2c_driver);
> +
> +MODULE_DESCRIPTION("Sony IMX290 CMOS Image Sensor Driver");
> +MODULE_AUTHOR("FRAMOS GmbH");
> +MODULE_AUTHOR("Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>");
> +MODULE_LICENSE("GPL v2");
Manivannan Sadhasivam Oct. 1, 2019, 6:42 p.m. UTC | #2
Hi Sakari,

On Mon, Sep 23, 2019 at 12:22:09PM +0300, Sakari Ailus wrote:
> Hi Manivannan,
> 
> On Fri, Aug 30, 2019 at 02:49:42PM +0530, Manivannan Sadhasivam wrote:
> > Add driver for Sony IMX290 CMOS image sensor driver. The driver only
> > supports I2C interface for programming and MIPI CSI-2 for sensor output.
> > 
> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> > ---
> >  drivers/media/i2c/Kconfig  |  11 +
> >  drivers/media/i2c/Makefile |   1 +
> >  drivers/media/i2c/imx290.c | 881 +++++++++++++++++++++++++++++++++++++
> >  3 files changed, 893 insertions(+)
> >  create mode 100644 drivers/media/i2c/imx290.c
> > 
> > diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> > index 79ce9ec6fc1b..4ebb80b18748 100644
> > --- a/drivers/media/i2c/Kconfig
> > +++ b/drivers/media/i2c/Kconfig
> > @@ -595,6 +595,17 @@ config VIDEO_IMX274
> >  	  This is a V4L2 sensor driver for the Sony IMX274
> >  	  CMOS image sensor.
> >  
> > +config VIDEO_IMX290
> > +	tristate "Sony IMX290 sensor support"
> > +	depends on I2C && VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API
> > +	depends on MEDIA_CAMERA_SUPPORT
> 
> Please drop this line. It will be redundant very soon.
> 

okay.

> > +	help
> > +	  This is a Video4Linux2 sensor driver for the Sony
> > +	  IMX290 camera sensor.
> > +
> > +	  To compile this driver as a module, choose M here: the
> > +	  module will be called imx290.
> > +
> >  config VIDEO_IMX319
> >  	tristate "Sony IMX319 sensor support"
> >  	depends on I2C && VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API
> > diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
> > index fd4ea86dedd5..04411ddb4922 100644
> > --- a/drivers/media/i2c/Makefile
> > +++ b/drivers/media/i2c/Makefile
> > @@ -111,6 +111,7 @@ obj-$(CONFIG_VIDEO_TC358743)	+= tc358743.o
> >  obj-$(CONFIG_VIDEO_IMX214)	+= imx214.o
> >  obj-$(CONFIG_VIDEO_IMX258)	+= imx258.o
> >  obj-$(CONFIG_VIDEO_IMX274)	+= imx274.o
> > +obj-$(CONFIG_VIDEO_IMX290)	+= imx290.o
> >  obj-$(CONFIG_VIDEO_IMX319)	+= imx319.o
> >  obj-$(CONFIG_VIDEO_IMX355)	+= imx355.o
> >  obj-$(CONFIG_VIDEO_ST_MIPID02) += st-mipid02.o
> > diff --git a/drivers/media/i2c/imx290.c b/drivers/media/i2c/imx290.c
> > new file mode 100644
> > index 000000000000..db5bb0d69eb8
> > --- /dev/null
> > +++ b/drivers/media/i2c/imx290.c
> > @@ -0,0 +1,881 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Sony IMX290 CMOS Image Sensor Driver
> > + *
> > + * Copyright (C) 2019 FRAMOS GmbH.
> > + *
> > + * Copyright (C) 2019 Linaro Ltd.
> > + * Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> > + */
> > +
> > +#include <linux/clk.h>
> > +#include <linux/delay.h>
> > +#include <linux/gpio/consumer.h>
> > +#include <linux/i2c.h>
> > +#include <linux/module.h>
> > +#include <linux/pm_runtime.h>
> > +#include <linux/regmap.h>
> > +#include <linux/regulator/consumer.h>
> > +#include <media/media-entity.h>
> > +#include <media/v4l2-ctrls.h>
> > +#include <media/v4l2-device.h>
> > +#include <media/v4l2-fwnode.h>
> > +#include <media/v4l2-subdev.h>
> > +
> > +#define IMX290_STANDBY 0x3000
> > +#define IMX290_REGHOLD 0x3001
> > +#define IMX290_XMSTA 0x3002
> > +#define IMX290_GAIN 0x3014
> > +
> > +#define IMX290_DEFAULT_LINK_FREQ 445500000
> > +
> > +static const char * const imx290_supply_name[] = {
> > +	"vdda",
> > +	"vddd",
> > +	"vdddo",
> > +};
> > +
> > +#define IMX290_NUM_SUPPLIES ARRAY_SIZE(imx290_supply_name)
> > +
> > +struct imx290_regval {
> > +	u16 reg;
> > +	u8 val;
> > +};
> > +
> > +struct imx290_mode {
> > +	u32 width;
> > +	u32 height;
> > +	u32 pixel_rate;
> > +	u32 link_freq_index;
> > +
> > +	const struct imx290_regval *data;
> > +	u32 data_size;
> > +};
> > +
> > +struct imx290 {
> > +	struct device *dev;
> > +	struct clk *xclk;
> > +	struct regmap *regmap;
> > +
> > +	struct v4l2_subdev sd;
> > +	struct v4l2_fwnode_endpoint ep;
> > +	struct media_pad pad;
> > +	struct v4l2_mbus_framefmt current_format;
> > +	const struct imx290_mode *current_mode;
> > +
> > +	struct regulator_bulk_data supplies[IMX290_NUM_SUPPLIES];
> > +	struct gpio_desc *rst_gpio;
> > +
> > +	struct v4l2_ctrl_handler ctrls;
> > +	struct v4l2_ctrl *link_freq;
> > +	struct v4l2_ctrl *pixel_rate;
> > +
> > +	struct mutex lock;
> > +};
> > +
> > +struct imx290_pixfmt {
> > +	u32 code;
> > +};
> > +
> > +static const struct imx290_pixfmt imx290_formats[] = {
> > +	{ MEDIA_BUS_FMT_SRGGB10_1X10 },
> 
> You have a single format here. You don't need the entire array, do you?
> 
> Unless you have plans to add more, that is.
> 

Yes, the sensor supports RAW12 format as well and it will be added once
this driver is merged.

> > +};
> > +
> > +static struct regmap_config imx290_regmap_config = {
> > +	.reg_bits = 16,
> > +	.val_bits = 8,
> > +	.cache_type = REGCACHE_RBTREE,
> > +};
> > +
> > +static const struct imx290_regval imx290_global_init_settings[] = {
> > +	{ 0x3007, 0x00 },
> > +	{ 0x3009, 0x00 },
> > +	{ 0x3018, 0x65 },
> > +	{ 0x3019, 0x04 },
> > +	{ 0x301a, 0x00 },
> > +	{ 0x3443, 0x03 },
> > +	{ 0x3444, 0x20 },
> > +	{ 0x3445, 0x25 },
> > +	{ 0x3407, 0x03 },
> > +	{ 0x303a, 0x0c },
> > +	{ 0x3040, 0x00 },
> > +	{ 0x3041, 0x00 },
> > +	{ 0x303c, 0x00 },
> > +	{ 0x303d, 0x00 },
> > +	{ 0x3042, 0x9c },
> > +	{ 0x3043, 0x07 },
> > +	{ 0x303e, 0x49 },
> > +	{ 0x303f, 0x04 },
> > +	{ 0x304b, 0x0a },
> > +	{ 0x300f, 0x00 },
> > +	{ 0x3010, 0x21 },
> > +	{ 0x3012, 0x64 },
> > +	{ 0x3016, 0x09 },
> > +	{ 0x3070, 0x02 },
> > +	{ 0x3071, 0x11 },
> > +	{ 0x309b, 0x10 },
> > +	{ 0x309c, 0x22 },
> > +	{ 0x30a2, 0x02 },
> > +	{ 0x30a6, 0x20 },
> > +	{ 0x30a8, 0x20 },
> > +	{ 0x30aa, 0x20 },
> > +	{ 0x30ac, 0x20 },
> > +	{ 0x30b0, 0x43 },
> > +	{ 0x3119, 0x9e },
> > +	{ 0x311c, 0x1e },
> > +	{ 0x311e, 0x08 },
> > +	{ 0x3128, 0x05 },
> > +	{ 0x313d, 0x83 },
> > +	{ 0x3150, 0x03 },
> > +	{ 0x317e, 0x00 },
> > +	{ 0x32b8, 0x50 },
> > +	{ 0x32b9, 0x10 },
> > +	{ 0x32ba, 0x00 },
> > +	{ 0x32bb, 0x04 },
> > +	{ 0x32c8, 0x50 },
> > +	{ 0x32c9, 0x10 },
> > +	{ 0x32ca, 0x00 },
> > +	{ 0x32cb, 0x04 },
> > +	{ 0x332c, 0xd3 },
> > +	{ 0x332d, 0x10 },
> > +	{ 0x332e, 0x0d },
> > +	{ 0x3358, 0x06 },
> > +	{ 0x3359, 0xe1 },
> > +	{ 0x335a, 0x11 },
> > +	{ 0x3360, 0x1e },
> > +	{ 0x3361, 0x61 },
> > +	{ 0x3362, 0x10 },
> > +	{ 0x33b0, 0x50 },
> > +	{ 0x33b2, 0x1a },
> > +	{ 0x33b3, 0x04 },
> > +};
> > +
> > +static const struct imx290_regval imx290_1080p_settings[] = {
> > +	/* mode settings */
> > +	{ 0x3007, 0x00 },
> > +	{ 0x303a, 0x0c },
> > +	{ 0x3414, 0x0a },
> > +	{ 0x3472, 0x80 },
> > +	{ 0x3473, 0x07 },
> > +	{ 0x3418, 0x38 },
> > +	{ 0x3419, 0x04 },
> > +	{ 0x3012, 0x64 },
> > +	{ 0x3013, 0x00 },
> > +	{ 0x305c, 0x18 },
> > +	{ 0x305d, 0x03 },
> > +	{ 0x305e, 0x20 },
> > +	{ 0x305f, 0x01 },
> > +	{ 0x315e, 0x1a },
> > +	{ 0x3164, 0x1a },
> > +	{ 0x3480, 0x49 },
> > +	/* data rate settings */
> > +	{ 0x3009, 0x01 },
> > +	{ 0x3405, 0x10 },
> > +	{ 0x3446, 0x57 },
> > +	{ 0x3447, 0x00 },
> > +	{ 0x3448, 0x37 },
> > +	{ 0x3449, 0x00 },
> > +	{ 0x344a, 0x1f },
> > +	{ 0x344b, 0x00 },
> > +	{ 0x344c, 0x1f },
> > +	{ 0x344d, 0x00 },
> > +	{ 0x344e, 0x1f },
> > +	{ 0x344f, 0x00 },
> > +	{ 0x3450, 0x77 },
> > +	{ 0x3451, 0x00 },
> > +	{ 0x3452, 0x1f },
> > +	{ 0x3453, 0x00 },
> > +	{ 0x3454, 0x17 },
> > +	{ 0x3455, 0x00 },
> > +	{ 0x301c, 0x98 },
> > +	{ 0x301d, 0x08 },
> > +};
> > +
> > +static const struct imx290_regval imx290_720p_settings[] = {
> > +	/* mode settings */
> > +	{ 0x3007, 0x10 },
> > +	{ 0x303a, 0x06 },
> > +	{ 0x3414, 0x04 },
> > +	{ 0x3472, 0x00 },
> > +	{ 0x3473, 0x05 },
> > +	{ 0x3418, 0xd0 },
> > +	{ 0x3419, 0x02 },
> > +	{ 0x3012, 0x64 },
> > +	{ 0x3013, 0x00 },
> > +	{ 0x305c, 0x20 },
> > +	{ 0x305d, 0x00 },
> > +	{ 0x305e, 0x20 },
> > +	{ 0x305f, 0x01 },
> > +	{ 0x315e, 0x1a },
> > +	{ 0x3164, 0x1a },
> > +	{ 0x3480, 0x49 },
> > +	/* data rate settings */
> > +	{ 0x3009, 0x01 },
> > +	{ 0x3405, 0x10 },
> > +	{ 0x3446, 0x4f },
> > +	{ 0x3447, 0x00 },
> > +	{ 0x3448, 0x2f },
> > +	{ 0x3449, 0x00 },
> > +	{ 0x344a, 0x17 },
> > +	{ 0x344b, 0x00 },
> > +	{ 0x344c, 0x17 },
> > +	{ 0x344d, 0x00 },
> > +	{ 0x344e, 0x17 },
> > +	{ 0x344f, 0x00 },
> > +	{ 0x3450, 0x57 },
> > +	{ 0x3451, 0x00 },
> > +	{ 0x3452, 0x17 },
> > +	{ 0x3453, 0x00 },
> > +	{ 0x3454, 0x17 },
> > +	{ 0x3455, 0x00 },
> > +	{ 0x301c, 0xe4 },
> > +	{ 0x301d, 0x0c },
> > +};
> > +
> > +static const struct imx290_regval imx290_10bit_settings[] = {
> > +	{ 0x3005, 0x00},
> > +	{ 0x3046, 0x00},
> > +	{ 0x3129, 0x1d},
> > +	{ 0x317c, 0x12},
> > +	{ 0x31ec, 0x37},
> > +	{ 0x3441, 0x0a},
> > +	{ 0x3442, 0x0a},
> > +	{ 0x300a, 0x3c},
> > +	{ 0x300b, 0x00},
> > +};
> > +
> > +/* supported link frequencies */
> > +static const s64 imx290_link_freq[] = {
> > +	IMX290_DEFAULT_LINK_FREQ,
> > +};
> > +
> > +/* Mode configs */
> > +static const struct imx290_mode imx290_modes[] = {
> > +	{
> > +		.width = 1920,
> > +		.height = 1080,
> > +		.data = imx290_1080p_settings,
> > +		.data_size = ARRAY_SIZE(imx290_1080p_settings),
> > +		.pixel_rate = 178200000,
> > +		.link_freq_index = 0,
> > +	},
> > +	{
> > +		.width = 1280,
> > +		.height = 720,
> > +		.data = imx290_720p_settings,
> > +		.data_size = ARRAY_SIZE(imx290_720p_settings),
> > +		.pixel_rate = 178200000,
> > +		.link_freq_index = 0,
> > +	},
> > +};
> > +
> > +static inline struct imx290 *to_imx290(struct v4l2_subdev *_sd)
> > +{
> > +	return container_of(_sd, struct imx290, sd);
> > +}
> > +
> > +static inline int imx290_read_reg(struct imx290 *imx290, u16 addr, u8 *value)
> > +{
> > +	u32 regval;
> 
> I don't remember for sure what I asked previously, but feel free to make
> this unsigned int again. The third argument of regmap_read() is of that
> type.
> 

Yes, I overlooked this one.

> > +	int ret;
> > +
> > +	ret = regmap_read(imx290->regmap, addr, &regval);
> > +	if (ret) {
> > +		dev_err(imx290->dev, "I2C read failed for addr: %x\n", addr);
> > +		return ret;
> > +	}
> > +
> > +	*value = regval & 0xff;
> > +
> > +	return 0;
> > +}
> > +
> > +static int imx290_write_reg(struct imx290 *imx290, u16 addr, u8 value)
> > +{
> > +	int ret;
> > +
> > +	ret = regmap_write(imx290->regmap, addr, value);
> > +	if (ret) {
> > +		dev_err(imx290->dev, "I2C write failed for addr: %x\n", addr);
> > +		return ret;
> > +	}
> > +
> > +	return ret;
> > +}
> > +
> > +static int imx290_set_register_array(struct imx290 *imx290,
> > +				     const struct imx290_regval *settings,
> > +				     unsigned int num_settings)
> > +{
> > +	unsigned int i;
> > +	int ret;
> > +
> > +	for (i = 0; i < num_settings; ++i, ++settings) {
> > +		ret = imx290_write_reg(imx290, settings->reg, settings->val);
> > +		if (ret < 0)
> > +			return ret;
> > +
> > +		/* Settle time is 10ms for all registers */
> > +		msleep(10);
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +static int imx290_write_buffered_reg(struct imx290 *imx290, u16 address_low,
> > +				     u8 nr_regs, u32 value)
> > +{
> > +	unsigned int i;
> > +	int ret;
> > +
> > +	ret = imx290_write_reg(imx290, IMX290_REGHOLD, 0x01);
> > +	if (ret) {
> > +		dev_err(imx290->dev, "Error setting hold register\n");
> > +		return ret;
> > +	}
> > +
> > +	for (i = 0; i < nr_regs; i++) {
> > +		ret = imx290_write_reg(imx290, address_low + i,
> > +				       (u8)(value >> (i * 8)));
> > +		if (ret) {
> > +			dev_err(imx290->dev, "Error writing buffered registers\n");
> > +			return ret;
> > +		}
> > +	}
> > +
> > +	ret = imx290_write_reg(imx290, IMX290_REGHOLD, 0x00);
> > +	if (ret) {
> > +		dev_err(imx290->dev, "Error setting hold register\n");
> > +		return ret;
> > +	}
> > +
> > +	return ret;
> > +}
> > +
> > +static int imx290_set_gain(struct imx290 *imx290, u32 value)
> > +{
> > +	int ret;
> > +
> > +	u32 adjusted_value = (value * 10) / 3;
> 
> What's the purpose of this? Why not to use the value directly?
> 

The gain register accepts the value 10/3 of the actual gain required. Hence,
we need to manually do the calculation before updating the value. I can
add a comment here to clarify.

> > +
> > +	ret = imx290_write_buffered_reg(imx290, IMX290_GAIN, 1, adjusted_value);
> > +	if (ret)
> > +		dev_err(imx290->dev, "Unable to write gain\n");
> > +
> > +	return ret;
> > +}
> > +
> > +static int imx290_set_power_on(struct imx290 *imx290)
> > +{
> > +	int ret;
> > +
> > +	ret = clk_prepare_enable(imx290->xclk);
> 
> Please move the code from this function to the runtime PM runtime suspend
> callback. The same for imx290_set_power_off().
> 

May I know why? I think since this is being used only once, you're suggesting
to move to the callback function itself but please see the comment below. I
will reuse this function to power on the device during probe.

> > +	if (ret) {
> > +		dev_err(imx290->dev, "Failed to enable clock\n");
> > +		return ret;
> > +	}
> > +
> > +	ret = regulator_bulk_enable(IMX290_NUM_SUPPLIES,
> > +				    imx290->supplies);
> 
> Fits on a single line.
> 

Ack.

> > +	if (ret) {
> > +		dev_err(imx290->dev, "Failed to enable regulators\n");
> > +		goto xclk_off;
> > +	}
> > +
> > +	usleep_range(1, 2);
> > +	gpiod_set_value_cansleep(imx290->rst_gpio, 1);
> > +	usleep_range(30000, 31000);
> > +
> > +	return 0;
> > +
> > +xclk_off:
> > +	clk_disable_unprepare(imx290->xclk);
> > +	return ret;
> > +}
> > +
> > +/* Stop streaming */
> > +static int imx290_stop_streaming(struct imx290 *imx290)
> > +{
> > +	int ret;
> > +
> > +	ret = imx290_write_reg(imx290, IMX290_STANDBY, 0x01);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	msleep(30);
> > +
> > +	return imx290_write_reg(imx290, IMX290_XMSTA, 0x01);
> > +}
> > +
> > +static void imx290_set_power_off(struct imx290 *imx290)
> > +{
> > +	clk_disable_unprepare(imx290->xclk);
> > +	gpiod_set_value_cansleep(imx290->rst_gpio, 0);
> > +	regulator_bulk_disable(IMX290_NUM_SUPPLIES, imx290->supplies);
> > +}
> > +
> > +static int imx290_set_ctrl(struct v4l2_ctrl *ctrl)
> > +{
> > +	struct imx290 *imx290 = container_of(ctrl->handler,
> > +					     struct imx290, ctrls);
> > +	int ret = 0;
> > +
> > +	/* V4L2 controls values will be applied only when power is already up */
> > +	if (!pm_runtime_get_if_in_use(imx290->dev))
> > +		return 0;
> > +
> > +	switch (ctrl->id) {
> > +	case V4L2_CID_GAIN:
> > +		ret = imx290_set_gain(imx290, ctrl->val);
> > +		break;
> > +	default:
> > +		ret = -EINVAL;
> > +		break;
> > +	}
> > +
> > +	pm_runtime_put(imx290->dev);
> > +
> > +	return ret;
> > +}
> > +
> > +static const struct v4l2_ctrl_ops imx290_ctrl_ops = {
> > +	.s_ctrl = imx290_set_ctrl,
> > +};
> > +
> > +static int imx290_enum_mbus_code(struct v4l2_subdev *sd,
> > +				 struct v4l2_subdev_pad_config *cfg,
> > +				 struct v4l2_subdev_mbus_code_enum *code)
> > +{
> > +	if (code->index >= ARRAY_SIZE(imx290_formats))
> > +		return -EINVAL;
> > +
> > +	code->code = imx290_formats[code->index].code;
> > +
> > +	return 0;
> > +}
> > +
> > +static int imx290_get_fmt(struct v4l2_subdev *sd,
> > +			  struct v4l2_subdev_pad_config *cfg,
> > +			  struct v4l2_subdev_format *fmt)
> > +{
> > +	struct imx290 *imx290 = to_imx290(sd);
> > +	struct v4l2_mbus_framefmt *framefmt;
> > +
> > +	mutex_lock(&imx290->lock);
> > +
> > +	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY)
> > +		framefmt = v4l2_subdev_get_try_format(&imx290->sd, cfg,
> > +						      fmt->pad);
> > +	else
> > +		framefmt = &imx290->current_format;
> > +
> > +	fmt->format = *framefmt;
> > +
> > +	mutex_unlock(&imx290->lock);
> > +
> > +	return 0;
> > +}
> > +
> > +static int imx290_set_fmt(struct v4l2_subdev *sd,
> > +			  struct v4l2_subdev_pad_config *cfg,
> > +		      struct v4l2_subdev_format *fmt)
> > +{
> > +	struct imx290 *imx290 = to_imx290(sd);
> > +	const struct imx290_mode *mode;
> > +	struct v4l2_mbus_framefmt *format;
> > +	int i, ret = 0;
> 
> unsigned int i
> 

okay.

> > +
> > +	mutex_lock(&imx290->lock);
> > +
> > +	mode = v4l2_find_nearest_size(imx290_modes,
> > +				      ARRAY_SIZE(imx290_modes),
> > +				      width, height,
> > +				      fmt->format.width, fmt->format.height);
> > +
> > +	fmt->format.width = mode->width;
> > +	fmt->format.height = mode->height;
> > +
> > +	for (i = 0; i < ARRAY_SIZE(imx290_formats); i++)
> > +		if (imx290_formats[i].code == fmt->format.code)
> > +			break;
> > +
> > +	if (i >= ARRAY_SIZE(imx290_formats))
> > +		i = 0;
> > +
> > +	fmt->format.code = imx290_formats[i].code;
> > +	fmt->format.field = V4L2_FIELD_NONE;
> > +
> > +	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
> > +		format = v4l2_subdev_get_try_format(sd, cfg, fmt->pad);
> > +	} else {
> > +		format = &imx290->current_format;
> > +		__v4l2_ctrl_s_ctrl(imx290->link_freq, mode->link_freq_index);
> > +		__v4l2_ctrl_s_ctrl_int64(imx290->pixel_rate, mode->pixel_rate);
> > +
> > +		imx290->current_mode = mode;
> > +	}
> > +
> > +	*format = fmt->format;
> > +
> > +	mutex_unlock(&imx290->lock);
> > +
> > +	return ret;
> > +}
> > +
> > +static int imx290_entity_init_cfg(struct v4l2_subdev *subdev,
> > +				  struct v4l2_subdev_pad_config *cfg)
> > +{
> > +	struct v4l2_subdev_format fmt = { 0 };
> > +
> > +	fmt.which = cfg ? V4L2_SUBDEV_FORMAT_TRY : V4L2_SUBDEV_FORMAT_ACTIVE;
> > +	fmt.format.width = 1920;
> > +	fmt.format.height = 1080;
> > +
> > +	imx290_set_fmt(subdev, cfg, &fmt);
> > +
> > +	return 0;
> > +}
> > +
> > +static int imx290_write_current_format(struct imx290 *imx290,
> > +				       struct v4l2_mbus_framefmt *format)
> > +{
> > +	int ret;
> > +
> > +	switch (format->code) {
> > +	case MEDIA_BUS_FMT_SRGGB10_1X10:
> > +		ret = imx290_set_register_array(imx290, imx290_10bit_settings,
> > +					ARRAY_SIZE(imx290_10bit_settings));
> 
> Indentation.
> 

okay.

> > +		if (ret < 0) {
> > +			dev_err(imx290->dev, "Could not set format registers\n");
> > +			return ret;
> > +		}
> > +		break;
> > +	default:
> > +		dev_err(imx290->dev, "Unknown pixel format\n");
> > +		return -EINVAL;
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +/* Start streaming */
> > +static int imx290_start_streaming(struct imx290 *imx290)
> > +{
> > +	int ret;
> > +
> > +	/* Set init register settings */
> > +	ret = imx290_set_register_array(imx290, imx290_global_init_settings,
> > +				ARRAY_SIZE(imx290_global_init_settings));
> > +	if (ret < 0) {
> > +		dev_err(imx290->dev, "Could not set init registers\n");
> > +		return ret;
> > +	}
> > +
> > +	/* Set current frame format */
> > +	ret = imx290_write_current_format(imx290, &imx290->current_format);
> > +	if (ret < 0) {
> > +		dev_err(imx290->dev, "Could not set frame format\n");
> > +		return ret;
> > +	}
> > +
> > +	/* Apply default values of current mode */
> > +	ret = imx290_set_register_array(imx290, imx290->current_mode->data,
> > +					imx290->current_mode->data_size);
> > +	if (ret < 0) {
> > +		dev_err(imx290->dev, "Could not set current mode\n");
> > +		return ret;
> > +	}
> > +
> > +	/* Apply customized values from user */
> > +	ret = v4l2_ctrl_handler_setup(imx290->sd.ctrl_handler);
> > +	if (ret) {
> > +		dev_err(imx290->dev, "Could not sync v4l2 controls\n");
> > +		return ret;
> > +	}
> > +
> > +	ret = imx290_write_reg(imx290, IMX290_STANDBY, 0x00);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	msleep(30);
> > +
> > +	/* Start streaming */
> > +	return imx290_write_reg(imx290, IMX290_XMSTA, 0x00);
> > +}
> > +
> > +static int imx290_set_stream(struct v4l2_subdev *sd, int enable)
> > +{
> > +	struct imx290 *imx290 = to_imx290(sd);
> > +	int ret = 0;
> > +
> > +	if (enable) {
> > +		ret = pm_runtime_get_sync(imx290->dev);
> > +		if (ret < 0) {
> > +			pm_runtime_put_noidle(imx290->dev);
> > +			goto unlock_and_return;
> > +		}
> > +
> > +		ret = imx290_start_streaming(imx290);
> > +		if (ret) {
> > +			dev_err(imx290->dev, "Start stream failed\n");
> > +			pm_runtime_put(imx290->dev);
> > +			goto unlock_and_return;
> > +		}
> > +	} else {
> > +		imx290_stop_streaming(imx290);
> > +		pm_runtime_put(imx290->dev);
> > +	}
> > +
> > +unlock_and_return:
> > +
> > +	return ret;
> > +}
> > +
> > +static int imx290_get_regulators(struct device *dev, struct imx290 *imx290)
> > +{
> > +	unsigned int i;
> > +
> > +	for (i = 0; i < IMX290_NUM_SUPPLIES; i++)
> > +		imx290->supplies[i].supply = imx290_supply_name[i];
> > +
> > +	return devm_regulator_bulk_get(dev, IMX290_NUM_SUPPLIES,
> > +				       imx290->supplies);
> > +}
> > +
> > +static int __maybe_unused imx290_runtime_resume(struct device *dev)
> > +{
> > +	struct i2c_client *client = to_i2c_client(dev);
> > +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> > +	struct imx290 *imx290 = to_imx290(sd);
> > +
> > +	return imx290_set_power_on(imx290);
> > +}
> > +
> > +static int __maybe_unused imx290_runtime_suspend(struct device *dev)
> > +{
> > +	struct i2c_client *client = to_i2c_client(dev);
> > +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> > +	struct imx290 *imx290 = to_imx290(sd);
> > +
> > +	imx290_set_power_off(imx290);
> > +
> > +	return 0;
> > +}
> > +
> > +static const struct dev_pm_ops imx290_pm_ops = {
> > +	SET_RUNTIME_PM_OPS(imx290_runtime_suspend,
> > +			   imx290_runtime_resume, NULL)
> 
> Fits on a single line.
> 

Ack.

> > +};
> > +
> > +static const struct v4l2_subdev_video_ops imx290_video_ops = {
> > +	.s_stream = imx290_set_stream,
> > +};
> > +
> > +static const struct v4l2_subdev_pad_ops imx290_pad_ops = {
> > +	.init_cfg = imx290_entity_init_cfg,
> > +	.enum_mbus_code = imx290_enum_mbus_code,
> > +	.get_fmt = imx290_get_fmt,
> > +	.set_fmt = imx290_set_fmt,
> > +};
> > +
> > +static const struct v4l2_subdev_ops imx290_subdev_ops = {
> > +	.video = &imx290_video_ops,
> > +	.pad = &imx290_pad_ops,
> > +};
> > +
> > +static const struct media_entity_operations imx290_subdev_entity_ops = {
> > +	.link_validate = v4l2_subdev_link_validate,
> > +};
> > +
> > +static int imx290_probe(struct i2c_client *client)
> > +{
> > +	struct device *dev = &client->dev;
> > +	struct fwnode_handle *endpoint;
> > +	struct imx290 *imx290;
> > +	u32 xclk_freq;
> > +	int ret;
> > +
> > +	imx290 = devm_kzalloc(dev, sizeof(*imx290), GFP_KERNEL);
> > +	if (!imx290)
> > +		return -ENOMEM;
> > +
> > +	imx290->dev = dev;
> > +	imx290->regmap = devm_regmap_init_i2c(client, &imx290_regmap_config);
> > +	if (IS_ERR(imx290->regmap)) {
> > +		dev_err(dev, "Unable to initialize I2C\n");
> > +		return -ENODEV;
> > +	}
> > +
> > +	endpoint = fwnode_graph_get_next_endpoint(dev_fwnode(dev), NULL);
> > +	if (!endpoint) {
> > +		dev_err(dev, "Endpoint node not found\n");
> > +		return -EINVAL;
> > +	}
> > +
> > +	ret = v4l2_fwnode_endpoint_alloc_parse(endpoint, &imx290->ep);
> 
> You're missing v4l2_fwnode_endpoint_free() below, both in error handling as
> for the successful case.
> 

ah, yes. Will add.

> > +	fwnode_handle_put(endpoint);
> > +	if (ret) {
> > +		dev_err(dev, "Parsing endpoint node failed\n");
> > +		return ret;
> > +	}
> > +
> > +	if (!imx290->ep.nr_of_link_frequencies) {
> > +		dev_err(dev, "link-frequency property not found in DT\n");
> > +		return -EINVAL;
> > +	}
> > +
> > +	if (imx290->ep.link_frequencies[0] != IMX290_DEFAULT_LINK_FREQ) {
> > +		dev_err(dev, "Unsupported link frequency\n");
> > +		return -EINVAL;
> > +	}
> > +
> > +	/* Only CSI2 is supported for now */
> > +	if (imx290->ep.bus_type != V4L2_MBUS_CSI2_DPHY) {
> > +		dev_err(dev, "Unsupported bus type, should be CSI2\n");
> > +		return -EINVAL;
> > +	}
> > +
> > +	/* Set default mode to max resolution */
> > +	imx290->current_mode = &imx290_modes[0];
> > +
> > +	/* get system clock (xclk) */
> > +	imx290->xclk = devm_clk_get(dev, "xclk");
> > +	if (IS_ERR(imx290->xclk)) {
> > +		dev_err(dev, "Could not get xclk");
> > +		return PTR_ERR(imx290->xclk);
> > +	}
> > +
> > +	ret = of_property_read_u32(dev->of_node, "clock-frequency", &xclk_freq);
> 
> You're using the fwnode API elsewhere in the driver; please use
> fwnode_property_read_u32() here, too.
> 

okay.

> > +	if (ret) {
> > +		dev_err(dev, "Could not get xclk frequency\n");
> > +		return ret;
> > +	}
> > +
> > +	/* external clock must be 37.125 MHz */
> > +	if (xclk_freq != 37125000) {
> > +		dev_err(dev, "External clock frequency %u is not supported\n",
> > +			xclk_freq);
> > +		return -EINVAL;
> > +	}
> > +
> > +	ret = clk_set_rate(imx290->xclk, xclk_freq);
> > +	if (ret) {
> > +		dev_err(dev, "Could not set xclk frequency\n");
> > +		return ret;
> > +	}
> > +
> > +	ret = imx290_get_regulators(dev, imx290);
> > +	if (ret < 0) {
> > +		dev_err(dev, "Cannot get regulators\n");
> > +		return ret;
> > +	}
> > +
> > +	imx290->rst_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_ASIS);
> > +	if (IS_ERR(imx290->rst_gpio)) {
> > +		dev_err(dev, "Cannot get reset gpio\n");
> > +		return PTR_ERR(imx290->rst_gpio);
> > +	}
> > +
> > +	mutex_init(&imx290->lock);
> > +
> > +	v4l2_ctrl_handler_init(&imx290->ctrls, 3);
> > +
> > +	v4l2_ctrl_new_std(&imx290->ctrls, &imx290_ctrl_ops,
> > +			  V4L2_CID_GAIN, 0, 72, 1, 0);
> > +	imx290->link_freq = v4l2_ctrl_new_int_menu(&imx290->ctrls,
> > +					&imx290_ctrl_ops,
> > +					V4L2_CID_LINK_FREQ,
> > +					ARRAY_SIZE(imx290_link_freq) - 1,
> > +					0, imx290_link_freq);
> > +	if (imx290->link_freq)
> > +		imx290->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;
> > +
> > +	imx290->pixel_rate = v4l2_ctrl_new_std(&imx290->ctrls, &imx290_ctrl_ops,
> > +					       V4L2_CID_PIXEL_RATE, 1,
> > +					       INT_MAX, 1,
> > +					       imx290_modes[0].pixel_rate);
> > +
> > +	imx290->sd.ctrl_handler = &imx290->ctrls;
> > +
> > +	if (imx290->ctrls.error) {
> > +		dev_err(dev, "Control initialization error %d\n",
> > +			imx290->ctrls.error);
> > +		ret = imx290->ctrls.error;
> > +		goto free_ctrl;
> > +	}
> > +
> > +	v4l2_i2c_subdev_init(&imx290->sd, client, &imx290_subdev_ops);
> > +	imx290->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> > +	imx290->sd.dev = &client->dev;
> > +	imx290->sd.entity.ops = &imx290_subdev_entity_ops;
> > +	imx290->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
> > +
> > +	imx290->pad.flags = MEDIA_PAD_FL_SOURCE;
> > +	ret = media_entity_pads_init(&imx290->sd.entity, 1, &imx290->pad);
> > +	if (ret < 0) {
> > +		dev_err(dev, "Could not register media entity\n");
> > +		goto free_ctrl;
> > +	}
> > +
> > +	ret = v4l2_async_register_subdev(&imx290->sd);
> > +	if (ret < 0) {
> > +		dev_err(dev, "Could not register v4l2 device\n");
> > +		goto free_entity;
> > +	}
> > +
> > +	pm_runtime_set_active(dev);
> > +	pm_runtime_enable(dev);
> 
> Here, runtime PM's idea of your device's power state is that it's powered
> on. You'll need to manually call the function doing that before you're
> here. Otherewise there's a chance that the device will be powered off when
> the first use tries to access it. See e.g. the smiapp driver for an
> example.
> 

This makes perfect sense. I think the code to turn on the device got removed
while migrating to pm_runtime. So, I'll use imx290_set_power_on() function
to power on the device.

Thanks,
Mani

> > +	pm_runtime_idle(dev);
> > +
> > +	return 0;
> > +
> > +free_entity:
> > +	media_entity_cleanup(&imx290->sd.entity);
> > +free_ctrl:
> > +	v4l2_ctrl_handler_free(&imx290->ctrls);
> > +	mutex_destroy(&imx290->lock);
> > +
> > +	return ret;
> > +}
> > +
> > +static int imx290_remove(struct i2c_client *client)
> > +{
> > +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> > +	struct imx290 *imx290 = to_imx290(sd);
> > +
> > +	v4l2_async_unregister_subdev(sd);
> > +	media_entity_cleanup(&sd->entity);
> > +	v4l2_ctrl_handler_free(sd->ctrl_handler);
> > +
> > +	mutex_destroy(&imx290->lock);
> > +
> > +	pm_runtime_disable(imx290->dev);
> > +	if (!pm_runtime_status_suspended(imx290->dev))
> > +		imx290_set_power_off(imx290);
> > +	pm_runtime_set_suspended(imx290->dev);
> > +
> > +	return 0;
> > +}
> > +
> > +static const struct of_device_id imx290_of_match[] = {
> > +	{ .compatible = "sony,imx290" },
> > +	{ /* sentinel */ }
> > +};
> > +MODULE_DEVICE_TABLE(of, imx290_of_match);
> > +
> > +static struct i2c_driver imx290_i2c_driver = {
> > +	.probe_new  = imx290_probe,
> > +	.remove = imx290_remove,
> > +	.driver = {
> > +		.name  = "imx290",
> > +		.pm = &imx290_pm_ops,
> > +		.of_match_table = of_match_ptr(imx290_of_match),
> > +	},
> > +};
> > +
> > +module_i2c_driver(imx290_i2c_driver);
> > +
> > +MODULE_DESCRIPTION("Sony IMX290 CMOS Image Sensor Driver");
> > +MODULE_AUTHOR("FRAMOS GmbH");
> > +MODULE_AUTHOR("Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>");
> > +MODULE_LICENSE("GPL v2");
> 
> -- 
> Kind regards,
> 
> Sakari Ailus
Sakari Ailus Oct. 2, 2019, 10:37 a.m. UTC | #3
Hi Manivannan,

On Wed, Oct 02, 2019 at 12:12:00AM +0530, Manivannan Sadhasivam wrote:
> Hi Sakari,
> 
> On Mon, Sep 23, 2019 at 12:22:09PM +0300, Sakari Ailus wrote:
> > Hi Manivannan,
> > 
> > On Fri, Aug 30, 2019 at 02:49:42PM +0530, Manivannan Sadhasivam wrote:
> > > Add driver for Sony IMX290 CMOS image sensor driver. The driver only
> > > supports I2C interface for programming and MIPI CSI-2 for sensor output.
> > > 
> > > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> > > ---
> > >  drivers/media/i2c/Kconfig  |  11 +
> > >  drivers/media/i2c/Makefile |   1 +
> > >  drivers/media/i2c/imx290.c | 881 +++++++++++++++++++++++++++++++++++++
> > >  3 files changed, 893 insertions(+)
> > >  create mode 100644 drivers/media/i2c/imx290.c
> > > 
> > > diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> > > index 79ce9ec6fc1b..4ebb80b18748 100644
> > > --- a/drivers/media/i2c/Kconfig
> > > +++ b/drivers/media/i2c/Kconfig
> > > @@ -595,6 +595,17 @@ config VIDEO_IMX274
> > >  	  This is a V4L2 sensor driver for the Sony IMX274
> > >  	  CMOS image sensor.
> > >  
> > > +config VIDEO_IMX290
> > > +	tristate "Sony IMX290 sensor support"
> > > +	depends on I2C && VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API
> > > +	depends on MEDIA_CAMERA_SUPPORT
> > 
> > Please drop this line. It will be redundant very soon.
> > 
> 
> okay.
> 
> > > +	help
> > > +	  This is a Video4Linux2 sensor driver for the Sony
> > > +	  IMX290 camera sensor.
> > > +
> > > +	  To compile this driver as a module, choose M here: the
> > > +	  module will be called imx290.
> > > +
> > >  config VIDEO_IMX319
> > >  	tristate "Sony IMX319 sensor support"
> > >  	depends on I2C && VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API
> > > diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
> > > index fd4ea86dedd5..04411ddb4922 100644
> > > --- a/drivers/media/i2c/Makefile
> > > +++ b/drivers/media/i2c/Makefile
> > > @@ -111,6 +111,7 @@ obj-$(CONFIG_VIDEO_TC358743)	+= tc358743.o
> > >  obj-$(CONFIG_VIDEO_IMX214)	+= imx214.o
> > >  obj-$(CONFIG_VIDEO_IMX258)	+= imx258.o
> > >  obj-$(CONFIG_VIDEO_IMX274)	+= imx274.o
> > > +obj-$(CONFIG_VIDEO_IMX290)	+= imx290.o
> > >  obj-$(CONFIG_VIDEO_IMX319)	+= imx319.o
> > >  obj-$(CONFIG_VIDEO_IMX355)	+= imx355.o
> > >  obj-$(CONFIG_VIDEO_ST_MIPID02) += st-mipid02.o
> > > diff --git a/drivers/media/i2c/imx290.c b/drivers/media/i2c/imx290.c
> > > new file mode 100644
> > > index 000000000000..db5bb0d69eb8
> > > --- /dev/null
> > > +++ b/drivers/media/i2c/imx290.c
> > > @@ -0,0 +1,881 @@
> > > +// SPDX-License-Identifier: GPL-2.0
> > > +/*
> > > + * Sony IMX290 CMOS Image Sensor Driver
> > > + *
> > > + * Copyright (C) 2019 FRAMOS GmbH.
> > > + *
> > > + * Copyright (C) 2019 Linaro Ltd.
> > > + * Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> > > + */
> > > +
> > > +#include <linux/clk.h>
> > > +#include <linux/delay.h>
> > > +#include <linux/gpio/consumer.h>
> > > +#include <linux/i2c.h>
> > > +#include <linux/module.h>
> > > +#include <linux/pm_runtime.h>
> > > +#include <linux/regmap.h>
> > > +#include <linux/regulator/consumer.h>
> > > +#include <media/media-entity.h>
> > > +#include <media/v4l2-ctrls.h>
> > > +#include <media/v4l2-device.h>
> > > +#include <media/v4l2-fwnode.h>
> > > +#include <media/v4l2-subdev.h>
> > > +
> > > +#define IMX290_STANDBY 0x3000
> > > +#define IMX290_REGHOLD 0x3001
> > > +#define IMX290_XMSTA 0x3002
> > > +#define IMX290_GAIN 0x3014
> > > +
> > > +#define IMX290_DEFAULT_LINK_FREQ 445500000
> > > +
> > > +static const char * const imx290_supply_name[] = {
> > > +	"vdda",
> > > +	"vddd",
> > > +	"vdddo",
> > > +};
> > > +
> > > +#define IMX290_NUM_SUPPLIES ARRAY_SIZE(imx290_supply_name)
> > > +
> > > +struct imx290_regval {
> > > +	u16 reg;
> > > +	u8 val;
> > > +};
> > > +
> > > +struct imx290_mode {
> > > +	u32 width;
> > > +	u32 height;
> > > +	u32 pixel_rate;
> > > +	u32 link_freq_index;
> > > +
> > > +	const struct imx290_regval *data;
> > > +	u32 data_size;
> > > +};
> > > +
> > > +struct imx290 {
> > > +	struct device *dev;
> > > +	struct clk *xclk;
> > > +	struct regmap *regmap;
> > > +
> > > +	struct v4l2_subdev sd;
> > > +	struct v4l2_fwnode_endpoint ep;
> > > +	struct media_pad pad;
> > > +	struct v4l2_mbus_framefmt current_format;
> > > +	const struct imx290_mode *current_mode;
> > > +
> > > +	struct regulator_bulk_data supplies[IMX290_NUM_SUPPLIES];
> > > +	struct gpio_desc *rst_gpio;
> > > +
> > > +	struct v4l2_ctrl_handler ctrls;
> > > +	struct v4l2_ctrl *link_freq;
> > > +	struct v4l2_ctrl *pixel_rate;
> > > +
> > > +	struct mutex lock;
> > > +};
> > > +
> > > +struct imx290_pixfmt {
> > > +	u32 code;
> > > +};
> > > +
> > > +static const struct imx290_pixfmt imx290_formats[] = {
> > > +	{ MEDIA_BUS_FMT_SRGGB10_1X10 },
> > 
> > You have a single format here. You don't need the entire array, do you?
> > 
> > Unless you have plans to add more, that is.
> > 
> 
> Yes, the sensor supports RAW12 format as well and it will be added once
> this driver is merged.

Ok. 

> 
> > > +};
> > > +
> > > +static struct regmap_config imx290_regmap_config = {

Should this be const, too?

> > > +	.reg_bits = 16,
> > > +	.val_bits = 8,
> > > +	.cache_type = REGCACHE_RBTREE,
> > > +};

...

> > > +static int imx290_write_buffered_reg(struct imx290 *imx290, u16 address_low,
> > > +				     u8 nr_regs, u32 value)
> > > +{
> > > +	unsigned int i;
> > > +	int ret;
> > > +
> > > +	ret = imx290_write_reg(imx290, IMX290_REGHOLD, 0x01);
> > > +	if (ret) {
> > > +		dev_err(imx290->dev, "Error setting hold register\n");
> > > +		return ret;
> > > +	}
> > > +
> > > +	for (i = 0; i < nr_regs; i++) {
> > > +		ret = imx290_write_reg(imx290, address_low + i,
> > > +				       (u8)(value >> (i * 8)));
> > > +		if (ret) {
> > > +			dev_err(imx290->dev, "Error writing buffered registers\n");
> > > +			return ret;
> > > +		}
> > > +	}
> > > +
> > > +	ret = imx290_write_reg(imx290, IMX290_REGHOLD, 0x00);
> > > +	if (ret) {
> > > +		dev_err(imx290->dev, "Error setting hold register\n");
> > > +		return ret;
> > > +	}
> > > +
> > > +	return ret;
> > > +}
> > > +
> > > +static int imx290_set_gain(struct imx290 *imx290, u32 value)
> > > +{
> > > +	int ret;
> > > +
> > > +	u32 adjusted_value = (value * 10) / 3;
> > 
> > What's the purpose of this? Why not to use the value directly?
> > 
> 
> The gain register accepts the value 10/3 of the actual gain required. Hence,
> we need to manually do the calculation before updating the value. I can
> add a comment here to clarify.

It's better to use the register value directly. Otherwise the granularity
won't be available to the user space.

> 
> > > +
> > > +	ret = imx290_write_buffered_reg(imx290, IMX290_GAIN, 1, adjusted_value);
> > > +	if (ret)
> > > +		dev_err(imx290->dev, "Unable to write gain\n");
> > > +
> > > +	return ret;
> > > +}
> > > +
> > > +static int imx290_set_power_on(struct imx290 *imx290)
> > > +{
> > > +	int ret;
> > > +
> > > +	ret = clk_prepare_enable(imx290->xclk);
> > 
> > Please move the code from this function to the runtime PM runtime suspend
> > callback. The same for imx290_set_power_off().
> > 
> 
> May I know why? I think since this is being used only once, you're suggesting
> to move to the callback function itself but please see the comment below. I
> will reuse this function to power on the device during probe.

Yes, you can call the same function from probe, even if it's used as a
runtime PM callback.

There's no need to have a function that acts as a wrapper for calling it
with a different type of an argument.
Manivannan Sadhasivam Oct. 3, 2019, 5:33 a.m. UTC | #4
Hi Sakari,

On Wed, Oct 02, 2019 at 01:37:15PM +0300, Sakari Ailus wrote:
> Hi Manivannan,
> 
> On Wed, Oct 02, 2019 at 12:12:00AM +0530, Manivannan Sadhasivam wrote:
> > Hi Sakari,
> > 
> > On Mon, Sep 23, 2019 at 12:22:09PM +0300, Sakari Ailus wrote:
> > > Hi Manivannan,
> > > 
> > > On Fri, Aug 30, 2019 at 02:49:42PM +0530, Manivannan Sadhasivam wrote:
> > > > Add driver for Sony IMX290 CMOS image sensor driver. The driver only
> > > > supports I2C interface for programming and MIPI CSI-2 for sensor output.
> > > > 
> > > > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> > > > ---
> > > >  drivers/media/i2c/Kconfig  |  11 +
> > > >  drivers/media/i2c/Makefile |   1 +
> > > >  drivers/media/i2c/imx290.c | 881 +++++++++++++++++++++++++++++++++++++
> > > >  3 files changed, 893 insertions(+)
> > > >  create mode 100644 drivers/media/i2c/imx290.c
> > > > 
> > > > diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> > > > index 79ce9ec6fc1b..4ebb80b18748 100644
> > > > --- a/drivers/media/i2c/Kconfig
> > > > +++ b/drivers/media/i2c/Kconfig
> > > > @@ -595,6 +595,17 @@ config VIDEO_IMX274
> > > >  	  This is a V4L2 sensor driver for the Sony IMX274
> > > >  	  CMOS image sensor.
> > > >  
> > > > +config VIDEO_IMX290
> > > > +	tristate "Sony IMX290 sensor support"
> > > > +	depends on I2C && VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API
> > > > +	depends on MEDIA_CAMERA_SUPPORT
> > > 
> > > Please drop this line. It will be redundant very soon.
> > > 
> > 
> > okay.
> > 
> > > > +	help
> > > > +	  This is a Video4Linux2 sensor driver for the Sony
> > > > +	  IMX290 camera sensor.
> > > > +
> > > > +	  To compile this driver as a module, choose M here: the
> > > > +	  module will be called imx290.
> > > > +
> > > >  config VIDEO_IMX319
> > > >  	tristate "Sony IMX319 sensor support"
> > > >  	depends on I2C && VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API
> > > > diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
> > > > index fd4ea86dedd5..04411ddb4922 100644
> > > > --- a/drivers/media/i2c/Makefile
> > > > +++ b/drivers/media/i2c/Makefile
> > > > @@ -111,6 +111,7 @@ obj-$(CONFIG_VIDEO_TC358743)	+= tc358743.o
> > > >  obj-$(CONFIG_VIDEO_IMX214)	+= imx214.o
> > > >  obj-$(CONFIG_VIDEO_IMX258)	+= imx258.o
> > > >  obj-$(CONFIG_VIDEO_IMX274)	+= imx274.o
> > > > +obj-$(CONFIG_VIDEO_IMX290)	+= imx290.o
> > > >  obj-$(CONFIG_VIDEO_IMX319)	+= imx319.o
> > > >  obj-$(CONFIG_VIDEO_IMX355)	+= imx355.o
> > > >  obj-$(CONFIG_VIDEO_ST_MIPID02) += st-mipid02.o
> > > > diff --git a/drivers/media/i2c/imx290.c b/drivers/media/i2c/imx290.c
> > > > new file mode 100644
> > > > index 000000000000..db5bb0d69eb8
> > > > --- /dev/null
> > > > +++ b/drivers/media/i2c/imx290.c
> > > > @@ -0,0 +1,881 @@
> > > > +// SPDX-License-Identifier: GPL-2.0
> > > > +/*
> > > > + * Sony IMX290 CMOS Image Sensor Driver
> > > > + *
> > > > + * Copyright (C) 2019 FRAMOS GmbH.
> > > > + *
> > > > + * Copyright (C) 2019 Linaro Ltd.
> > > > + * Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> > > > + */
> > > > +
> > > > +#include <linux/clk.h>
> > > > +#include <linux/delay.h>
> > > > +#include <linux/gpio/consumer.h>
> > > > +#include <linux/i2c.h>
> > > > +#include <linux/module.h>
> > > > +#include <linux/pm_runtime.h>
> > > > +#include <linux/regmap.h>
> > > > +#include <linux/regulator/consumer.h>
> > > > +#include <media/media-entity.h>
> > > > +#include <media/v4l2-ctrls.h>
> > > > +#include <media/v4l2-device.h>
> > > > +#include <media/v4l2-fwnode.h>
> > > > +#include <media/v4l2-subdev.h>
> > > > +
> > > > +#define IMX290_STANDBY 0x3000
> > > > +#define IMX290_REGHOLD 0x3001
> > > > +#define IMX290_XMSTA 0x3002
> > > > +#define IMX290_GAIN 0x3014
> > > > +
> > > > +#define IMX290_DEFAULT_LINK_FREQ 445500000
> > > > +
> > > > +static const char * const imx290_supply_name[] = {
> > > > +	"vdda",
> > > > +	"vddd",
> > > > +	"vdddo",
> > > > +};
> > > > +
> > > > +#define IMX290_NUM_SUPPLIES ARRAY_SIZE(imx290_supply_name)
> > > > +
> > > > +struct imx290_regval {
> > > > +	u16 reg;
> > > > +	u8 val;
> > > > +};
> > > > +
> > > > +struct imx290_mode {
> > > > +	u32 width;
> > > > +	u32 height;
> > > > +	u32 pixel_rate;
> > > > +	u32 link_freq_index;
> > > > +
> > > > +	const struct imx290_regval *data;
> > > > +	u32 data_size;
> > > > +};
> > > > +
> > > > +struct imx290 {
> > > > +	struct device *dev;
> > > > +	struct clk *xclk;
> > > > +	struct regmap *regmap;
> > > > +
> > > > +	struct v4l2_subdev sd;
> > > > +	struct v4l2_fwnode_endpoint ep;
> > > > +	struct media_pad pad;
> > > > +	struct v4l2_mbus_framefmt current_format;
> > > > +	const struct imx290_mode *current_mode;
> > > > +
> > > > +	struct regulator_bulk_data supplies[IMX290_NUM_SUPPLIES];
> > > > +	struct gpio_desc *rst_gpio;
> > > > +
> > > > +	struct v4l2_ctrl_handler ctrls;
> > > > +	struct v4l2_ctrl *link_freq;
> > > > +	struct v4l2_ctrl *pixel_rate;
> > > > +
> > > > +	struct mutex lock;
> > > > +};
> > > > +
> > > > +struct imx290_pixfmt {
> > > > +	u32 code;
> > > > +};
> > > > +
> > > > +static const struct imx290_pixfmt imx290_formats[] = {
> > > > +	{ MEDIA_BUS_FMT_SRGGB10_1X10 },
> > > 
> > > You have a single format here. You don't need the entire array, do you?
> > > 
> > > Unless you have plans to add more, that is.
> > > 
> > 
> > Yes, the sensor supports RAW12 format as well and it will be added once
> > this driver is merged.
> 
> Ok. 
> 
> > 
> > > > +};
> > > > +
> > > > +static struct regmap_config imx290_regmap_config = {
> 
> Should this be const, too?
> 

yep

> > > > +	.reg_bits = 16,
> > > > +	.val_bits = 8,
> > > > +	.cache_type = REGCACHE_RBTREE,
> > > > +};
> 
> ...
> 
> > > > +static int imx290_write_buffered_reg(struct imx290 *imx290, u16 address_low,
> > > > +				     u8 nr_regs, u32 value)
> > > > +{
> > > > +	unsigned int i;
> > > > +	int ret;
> > > > +
> > > > +	ret = imx290_write_reg(imx290, IMX290_REGHOLD, 0x01);
> > > > +	if (ret) {
> > > > +		dev_err(imx290->dev, "Error setting hold register\n");
> > > > +		return ret;
> > > > +	}
> > > > +
> > > > +	for (i = 0; i < nr_regs; i++) {
> > > > +		ret = imx290_write_reg(imx290, address_low + i,
> > > > +				       (u8)(value >> (i * 8)));
> > > > +		if (ret) {
> > > > +			dev_err(imx290->dev, "Error writing buffered registers\n");
> > > > +			return ret;
> > > > +		}
> > > > +	}
> > > > +
> > > > +	ret = imx290_write_reg(imx290, IMX290_REGHOLD, 0x00);
> > > > +	if (ret) {
> > > > +		dev_err(imx290->dev, "Error setting hold register\n");
> > > > +		return ret;
> > > > +	}
> > > > +
> > > > +	return ret;
> > > > +}
> > > > +
> > > > +static int imx290_set_gain(struct imx290 *imx290, u32 value)
> > > > +{
> > > > +	int ret;
> > > > +
> > > > +	u32 adjusted_value = (value * 10) / 3;
> > > 
> > > What's the purpose of this? Why not to use the value directly?
> > > 
> > 
> > The gain register accepts the value 10/3 of the actual gain required. Hence,
> > we need to manually do the calculation before updating the value. I can
> > add a comment here to clarify.
> 
> It's better to use the register value directly. Otherwise the granularity
> won't be available to the user space.
> 

The sensor datasheet clearly defines that the 10/3'rd of the expected gain
should be set to this register. So, IMO we should be setting the value as
mentioned in the datasheet. I agree that we are missing the userspace
granularity here but sticking to the device limitation shouldn't be a problem.
As I said, I'll add a comment here to clarify.

> > 
> > > > +
> > > > +	ret = imx290_write_buffered_reg(imx290, IMX290_GAIN, 1, adjusted_value);
> > > > +	if (ret)
> > > > +		dev_err(imx290->dev, "Unable to write gain\n");
> > > > +
> > > > +	return ret;
> > > > +}
> > > > +
> > > > +static int imx290_set_power_on(struct imx290 *imx290)
> > > > +{
> > > > +	int ret;
> > > > +
> > > > +	ret = clk_prepare_enable(imx290->xclk);
> > > 
> > > Please move the code from this function to the runtime PM runtime suspend
> > > callback. The same for imx290_set_power_off().
> > > 
> > 
> > May I know why? I think since this is being used only once, you're suggesting
> > to move to the callback function itself but please see the comment below. I
> > will reuse this function to power on the device during probe.
> 
> Yes, you can call the same function from probe, even if it's used as a
> runtime PM callback.
> 
> There's no need to have a function that acts as a wrapper for calling it
> with a different type of an argument.
> 

You mean directly calling imx290_runtime_resume() from probe is fine?

Thanks,
Mani

> -- 
> Kind regards,
> 
> Sakari Ailus
Sakari Ailus Oct. 3, 2019, 7:16 a.m. UTC | #5
Hi Manivannan,

On Thu, Oct 03, 2019 at 11:03:38AM +0530, Manivannan Sadhasivam wrote:
....
> > > > > +static int imx290_set_gain(struct imx290 *imx290, u32 value)
> > > > > +{
> > > > > +	int ret;
> > > > > +
> > > > > +	u32 adjusted_value = (value * 10) / 3;
> > > > 
> > > > What's the purpose of this? Why not to use the value directly?
> > > > 
> > > 
> > > The gain register accepts the value 10/3 of the actual gain required. Hence,
> > > we need to manually do the calculation before updating the value. I can
> > > add a comment here to clarify.
> > 
> > It's better to use the register value directly. Otherwise the granularity
> > won't be available to the user space.
> > 
> 
> The sensor datasheet clearly defines that the 10/3'rd of the expected gain
> should be set to this register. So, IMO we should be setting the value as

The unit of that gain is decibels, but the controls do not have a unit.
Register value is really preferred here.

> mentioned in the datasheet. I agree that we are missing the userspace
> granularity here but sticking to the device limitation shouldn't be a problem.
> As I said, I'll add a comment here to clarify.

The comment isn't visible in the uAPI.

> 
> > > 
> > > > > +
> > > > > +	ret = imx290_write_buffered_reg(imx290, IMX290_GAIN, 1, adjusted_value);
> > > > > +	if (ret)
> > > > > +		dev_err(imx290->dev, "Unable to write gain\n");
> > > > > +
> > > > > +	return ret;
> > > > > +}
> > > > > +
> > > > > +static int imx290_set_power_on(struct imx290 *imx290)
> > > > > +{
> > > > > +	int ret;
> > > > > +
> > > > > +	ret = clk_prepare_enable(imx290->xclk);
> > > > 
> > > > Please move the code from this function to the runtime PM runtime suspend
> > > > callback. The same for imx290_set_power_off().
> > > > 
> > > 
> > > May I know why? I think since this is being used only once, you're suggesting
> > > to move to the callback function itself but please see the comment below. I
> > > will reuse this function to power on the device during probe.
> > 
> > Yes, you can call the same function from probe, even if it's used as a
> > runtime PM callback.
> > 
> > There's no need to have a function that acts as a wrapper for calling it
> > with a different type of an argument.
> > 
> 
> You mean directly calling imx290_runtime_resume() from probe is fine?

Yes. Feel free to call it e.g. imx290_power_on or something.
Manivannan Sadhasivam Oct. 3, 2019, 7:26 a.m. UTC | #6
Hi Sakari, 

On 3 October 2019 12:46:46 PM IST, Sakari Ailus <sakari.ailus@iki.fi> wrote:
>Hi Manivannan,
>
>On Thu, Oct 03, 2019 at 11:03:38AM +0530, Manivannan Sadhasivam wrote:
>....
>> > > > > +static int imx290_set_gain(struct imx290 *imx290, u32 value)
>> > > > > +{
>> > > > > +	int ret;
>> > > > > +
>> > > > > +	u32 adjusted_value = (value * 10) / 3;
>> > > > 
>> > > > What's the purpose of this? Why not to use the value directly?
>> > > > 
>> > > 
>> > > The gain register accepts the value 10/3 of the actual gain
>required. Hence,
>> > > we need to manually do the calculation before updating the value.
>I can
>> > > add a comment here to clarify.
>> > 
>> > It's better to use the register value directly. Otherwise the
>granularity
>> > won't be available to the user space.
>> > 
>> 
>> The sensor datasheet clearly defines that the 10/3'rd of the expected
>gain
>> should be set to this register. So, IMO we should be setting the
>value as
>
>The unit of that gain is decibels, but the controls do not have a unit.
>Register value is really preferred here.
>

Hmm, okay. Will just pass the value directly. 

>> mentioned in the datasheet. I agree that we are missing the userspace
>> granularity here but sticking to the device limitation shouldn't be a
>problem.
>> As I said, I'll add a comment here to clarify.
>
>The comment isn't visible in the uAPI.
>

Yes. It would be good to have the units passed onto the userspace somehow like it is done in IIO. Then we don't need to fiddle in the driver for mismatch. Something consider in future... 

>> 
>> > > 
>> > > > > +
>> > > > > +	ret = imx290_write_buffered_reg(imx290, IMX290_GAIN, 1,
>adjusted_value);
>> > > > > +	if (ret)
>> > > > > +		dev_err(imx290->dev, "Unable to write gain\n");
>> > > > > +
>> > > > > +	return ret;
>> > > > > +}
>> > > > > +
>> > > > > +static int imx290_set_power_on(struct imx290 *imx290)
>> > > > > +{
>> > > > > +	int ret;
>> > > > > +
>> > > > > +	ret = clk_prepare_enable(imx290->xclk);
>> > > > 
>> > > > Please move the code from this function to the runtime PM
>runtime suspend
>> > > > callback. The same for imx290_set_power_off().
>> > > > 
>> > > 
>> > > May I know why? I think since this is being used only once,
>you're suggesting
>> > > to move to the callback function itself but please see the
>comment below. I
>> > > will reuse this function to power on the device during probe.
>> > 
>> > Yes, you can call the same function from probe, even if it's used
>as a
>> > runtime PM callback.
>> > 
>> > There's no need to have a function that acts as a wrapper for
>calling it
>> > with a different type of an argument.
>> > 
>> 
>> You mean directly calling imx290_runtime_resume() from probe is fine?
>
>Yes. Feel free to call it e.g. imx290_power_on or something.

Okay. 

Thanks, 
Mani
Sakari Ailus Oct. 3, 2019, 2:22 p.m. UTC | #7
Hi Manivannan,

On Thu, Oct 03, 2019 at 12:56:48PM +0530, Manivannan Sadhasivam wrote:
> >> mentioned in the datasheet. I agree that we are missing the userspace
> >> granularity here but sticking to the device limitation shouldn't be a
> >problem.
> >> As I said, I'll add a comment here to clarify.
> >
> >The comment isn't visible in the uAPI.
> >
> 
> Yes. It would be good to have the units passed onto the userspace somehow
> like it is done in IIO. Then we don't need to fiddle in the driver for
> mismatch. Something consider in future...

Yes, I agree. But that is not trivial to do in any sort of even remotely
generic way.

Patch
diff mbox series

diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index 79ce9ec6fc1b..4ebb80b18748 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -595,6 +595,17 @@  config VIDEO_IMX274
 	  This is a V4L2 sensor driver for the Sony IMX274
 	  CMOS image sensor.
 
+config VIDEO_IMX290
+	tristate "Sony IMX290 sensor support"
+	depends on I2C && VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API
+	depends on MEDIA_CAMERA_SUPPORT
+	help
+	  This is a Video4Linux2 sensor driver for the Sony
+	  IMX290 camera sensor.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called imx290.
+
 config VIDEO_IMX319
 	tristate "Sony IMX319 sensor support"
 	depends on I2C && VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API
diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
index fd4ea86dedd5..04411ddb4922 100644
--- a/drivers/media/i2c/Makefile
+++ b/drivers/media/i2c/Makefile
@@ -111,6 +111,7 @@  obj-$(CONFIG_VIDEO_TC358743)	+= tc358743.o
 obj-$(CONFIG_VIDEO_IMX214)	+= imx214.o
 obj-$(CONFIG_VIDEO_IMX258)	+= imx258.o
 obj-$(CONFIG_VIDEO_IMX274)	+= imx274.o
+obj-$(CONFIG_VIDEO_IMX290)	+= imx290.o
 obj-$(CONFIG_VIDEO_IMX319)	+= imx319.o
 obj-$(CONFIG_VIDEO_IMX355)	+= imx355.o
 obj-$(CONFIG_VIDEO_ST_MIPID02) += st-mipid02.o
diff --git a/drivers/media/i2c/imx290.c b/drivers/media/i2c/imx290.c
new file mode 100644
index 000000000000..db5bb0d69eb8
--- /dev/null
+++ b/drivers/media/i2c/imx290.c
@@ -0,0 +1,881 @@ 
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Sony IMX290 CMOS Image Sensor Driver
+ *
+ * Copyright (C) 2019 FRAMOS GmbH.
+ *
+ * Copyright (C) 2019 Linaro Ltd.
+ * Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <media/media-entity.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-fwnode.h>
+#include <media/v4l2-subdev.h>
+
+#define IMX290_STANDBY 0x3000
+#define IMX290_REGHOLD 0x3001
+#define IMX290_XMSTA 0x3002
+#define IMX290_GAIN 0x3014
+
+#define IMX290_DEFAULT_LINK_FREQ 445500000
+
+static const char * const imx290_supply_name[] = {
+	"vdda",
+	"vddd",
+	"vdddo",
+};
+
+#define IMX290_NUM_SUPPLIES ARRAY_SIZE(imx290_supply_name)
+
+struct imx290_regval {
+	u16 reg;
+	u8 val;
+};
+
+struct imx290_mode {
+	u32 width;
+	u32 height;
+	u32 pixel_rate;
+	u32 link_freq_index;
+
+	const struct imx290_regval *data;
+	u32 data_size;
+};
+
+struct imx290 {
+	struct device *dev;
+	struct clk *xclk;
+	struct regmap *regmap;
+
+	struct v4l2_subdev sd;
+	struct v4l2_fwnode_endpoint ep;
+	struct media_pad pad;
+	struct v4l2_mbus_framefmt current_format;
+	const struct imx290_mode *current_mode;
+
+	struct regulator_bulk_data supplies[IMX290_NUM_SUPPLIES];
+	struct gpio_desc *rst_gpio;
+
+	struct v4l2_ctrl_handler ctrls;
+	struct v4l2_ctrl *link_freq;
+	struct v4l2_ctrl *pixel_rate;
+
+	struct mutex lock;
+};
+
+struct imx290_pixfmt {
+	u32 code;
+};
+
+static const struct imx290_pixfmt imx290_formats[] = {
+	{ MEDIA_BUS_FMT_SRGGB10_1X10 },
+};
+
+static struct regmap_config imx290_regmap_config = {
+	.reg_bits = 16,
+	.val_bits = 8,
+	.cache_type = REGCACHE_RBTREE,
+};
+
+static const struct imx290_regval imx290_global_init_settings[] = {
+	{ 0x3007, 0x00 },
+	{ 0x3009, 0x00 },
+	{ 0x3018, 0x65 },
+	{ 0x3019, 0x04 },
+	{ 0x301a, 0x00 },
+	{ 0x3443, 0x03 },
+	{ 0x3444, 0x20 },
+	{ 0x3445, 0x25 },
+	{ 0x3407, 0x03 },
+	{ 0x303a, 0x0c },
+	{ 0x3040, 0x00 },
+	{ 0x3041, 0x00 },
+	{ 0x303c, 0x00 },
+	{ 0x303d, 0x00 },
+	{ 0x3042, 0x9c },
+	{ 0x3043, 0x07 },
+	{ 0x303e, 0x49 },
+	{ 0x303f, 0x04 },
+	{ 0x304b, 0x0a },
+	{ 0x300f, 0x00 },
+	{ 0x3010, 0x21 },
+	{ 0x3012, 0x64 },
+	{ 0x3016, 0x09 },
+	{ 0x3070, 0x02 },
+	{ 0x3071, 0x11 },
+	{ 0x309b, 0x10 },
+	{ 0x309c, 0x22 },
+	{ 0x30a2, 0x02 },
+	{ 0x30a6, 0x20 },
+	{ 0x30a8, 0x20 },
+	{ 0x30aa, 0x20 },
+	{ 0x30ac, 0x20 },
+	{ 0x30b0, 0x43 },
+	{ 0x3119, 0x9e },
+	{ 0x311c, 0x1e },
+	{ 0x311e, 0x08 },
+	{ 0x3128, 0x05 },
+	{ 0x313d, 0x83 },
+	{ 0x3150, 0x03 },
+	{ 0x317e, 0x00 },
+	{ 0x32b8, 0x50 },
+	{ 0x32b9, 0x10 },
+	{ 0x32ba, 0x00 },
+	{ 0x32bb, 0x04 },
+	{ 0x32c8, 0x50 },
+	{ 0x32c9, 0x10 },
+	{ 0x32ca, 0x00 },
+	{ 0x32cb, 0x04 },
+	{ 0x332c, 0xd3 },
+	{ 0x332d, 0x10 },
+	{ 0x332e, 0x0d },
+	{ 0x3358, 0x06 },
+	{ 0x3359, 0xe1 },
+	{ 0x335a, 0x11 },
+	{ 0x3360, 0x1e },
+	{ 0x3361, 0x61 },
+	{ 0x3362, 0x10 },
+	{ 0x33b0, 0x50 },
+	{ 0x33b2, 0x1a },
+	{ 0x33b3, 0x04 },
+};
+
+static const struct imx290_regval imx290_1080p_settings[] = {
+	/* mode settings */
+	{ 0x3007, 0x00 },
+	{ 0x303a, 0x0c },
+	{ 0x3414, 0x0a },
+	{ 0x3472, 0x80 },
+	{ 0x3473, 0x07 },
+	{ 0x3418, 0x38 },
+	{ 0x3419, 0x04 },
+	{ 0x3012, 0x64 },
+	{ 0x3013, 0x00 },
+	{ 0x305c, 0x18 },
+	{ 0x305d, 0x03 },
+	{ 0x305e, 0x20 },
+	{ 0x305f, 0x01 },
+	{ 0x315e, 0x1a },
+	{ 0x3164, 0x1a },
+	{ 0x3480, 0x49 },
+	/* data rate settings */
+	{ 0x3009, 0x01 },
+	{ 0x3405, 0x10 },
+	{ 0x3446, 0x57 },
+	{ 0x3447, 0x00 },
+	{ 0x3448, 0x37 },
+	{ 0x3449, 0x00 },
+	{ 0x344a, 0x1f },
+	{ 0x344b, 0x00 },
+	{ 0x344c, 0x1f },
+	{ 0x344d, 0x00 },
+	{ 0x344e, 0x1f },
+	{ 0x344f, 0x00 },
+	{ 0x3450, 0x77 },
+	{ 0x3451, 0x00 },
+	{ 0x3452, 0x1f },
+	{ 0x3453, 0x00 },
+	{ 0x3454, 0x17 },
+	{ 0x3455, 0x00 },
+	{ 0x301c, 0x98 },
+	{ 0x301d, 0x08 },
+};
+
+static const struct imx290_regval imx290_720p_settings[] = {
+	/* mode settings */
+	{ 0x3007, 0x10 },
+	{ 0x303a, 0x06 },
+	{ 0x3414, 0x04 },
+	{ 0x3472, 0x00 },
+	{ 0x3473, 0x05 },
+	{ 0x3418, 0xd0 },
+	{ 0x3419, 0x02 },
+	{ 0x3012, 0x64 },
+	{ 0x3013, 0x00 },
+	{ 0x305c, 0x20 },
+	{ 0x305d, 0x00 },
+	{ 0x305e, 0x20 },
+	{ 0x305f, 0x01 },
+	{ 0x315e, 0x1a },
+	{ 0x3164, 0x1a },
+	{ 0x3480, 0x49 },
+	/* data rate settings */
+	{ 0x3009, 0x01 },
+	{ 0x3405, 0x10 },
+	{ 0x3446, 0x4f },
+	{ 0x3447, 0x00 },
+	{ 0x3448, 0x2f },
+	{ 0x3449, 0x00 },
+	{ 0x344a, 0x17 },
+	{ 0x344b, 0x00 },
+	{ 0x344c, 0x17 },
+	{ 0x344d, 0x00 },
+	{ 0x344e, 0x17 },
+	{ 0x344f, 0x00 },
+	{ 0x3450, 0x57 },
+	{ 0x3451, 0x00 },
+	{ 0x3452, 0x17 },
+	{ 0x3453, 0x00 },
+	{ 0x3454, 0x17 },
+	{ 0x3455, 0x00 },
+	{ 0x301c, 0xe4 },
+	{ 0x301d, 0x0c },
+};
+
+static const struct imx290_regval imx290_10bit_settings[] = {
+	{ 0x3005, 0x00},
+	{ 0x3046, 0x00},
+	{ 0x3129, 0x1d},
+	{ 0x317c, 0x12},
+	{ 0x31ec, 0x37},
+	{ 0x3441, 0x0a},
+	{ 0x3442, 0x0a},
+	{ 0x300a, 0x3c},
+	{ 0x300b, 0x00},
+};
+
+/* supported link frequencies */
+static const s64 imx290_link_freq[] = {
+	IMX290_DEFAULT_LINK_FREQ,
+};
+
+/* Mode configs */
+static const struct imx290_mode imx290_modes[] = {
+	{
+		.width = 1920,
+		.height = 1080,
+		.data = imx290_1080p_settings,
+		.data_size = ARRAY_SIZE(imx290_1080p_settings),
+		.pixel_rate = 178200000,
+		.link_freq_index = 0,
+	},
+	{
+		.width = 1280,
+		.height = 720,
+		.data = imx290_720p_settings,
+		.data_size = ARRAY_SIZE(imx290_720p_settings),
+		.pixel_rate = 178200000,
+		.link_freq_index = 0,
+	},
+};
+
+static inline struct imx290 *to_imx290(struct v4l2_subdev *_sd)
+{
+	return container_of(_sd, struct imx290, sd);
+}
+
+static inline int imx290_read_reg(struct imx290 *imx290, u16 addr, u8 *value)
+{
+	u32 regval;
+	int ret;
+
+	ret = regmap_read(imx290->regmap, addr, &regval);
+	if (ret) {
+		dev_err(imx290->dev, "I2C read failed for addr: %x\n", addr);
+		return ret;
+	}
+
+	*value = regval & 0xff;
+
+	return 0;
+}
+
+static int imx290_write_reg(struct imx290 *imx290, u16 addr, u8 value)
+{
+	int ret;
+
+	ret = regmap_write(imx290->regmap, addr, value);
+	if (ret) {
+		dev_err(imx290->dev, "I2C write failed for addr: %x\n", addr);
+		return ret;
+	}
+
+	return ret;
+}
+
+static int imx290_set_register_array(struct imx290 *imx290,
+				     const struct imx290_regval *settings,
+				     unsigned int num_settings)
+{
+	unsigned int i;
+	int ret;
+
+	for (i = 0; i < num_settings; ++i, ++settings) {
+		ret = imx290_write_reg(imx290, settings->reg, settings->val);
+		if (ret < 0)
+			return ret;
+
+		/* Settle time is 10ms for all registers */
+		msleep(10);
+	}
+
+	return 0;
+}
+
+static int imx290_write_buffered_reg(struct imx290 *imx290, u16 address_low,
+				     u8 nr_regs, u32 value)
+{
+	unsigned int i;
+	int ret;
+
+	ret = imx290_write_reg(imx290, IMX290_REGHOLD, 0x01);
+	if (ret) {
+		dev_err(imx290->dev, "Error setting hold register\n");
+		return ret;
+	}
+
+	for (i = 0; i < nr_regs; i++) {
+		ret = imx290_write_reg(imx290, address_low + i,
+				       (u8)(value >> (i * 8)));
+		if (ret) {
+			dev_err(imx290->dev, "Error writing buffered registers\n");
+			return ret;
+		}
+	}
+
+	ret = imx290_write_reg(imx290, IMX290_REGHOLD, 0x00);
+	if (ret) {
+		dev_err(imx290->dev, "Error setting hold register\n");
+		return ret;
+	}
+
+	return ret;
+}
+
+static int imx290_set_gain(struct imx290 *imx290, u32 value)
+{
+	int ret;
+
+	u32 adjusted_value = (value * 10) / 3;
+
+	ret = imx290_write_buffered_reg(imx290, IMX290_GAIN, 1, adjusted_value);
+	if (ret)
+		dev_err(imx290->dev, "Unable to write gain\n");
+
+	return ret;
+}
+
+static int imx290_set_power_on(struct imx290 *imx290)
+{
+	int ret;
+
+	ret = clk_prepare_enable(imx290->xclk);
+	if (ret) {
+		dev_err(imx290->dev, "Failed to enable clock\n");
+		return ret;
+	}
+
+	ret = regulator_bulk_enable(IMX290_NUM_SUPPLIES,
+				    imx290->supplies);
+	if (ret) {
+		dev_err(imx290->dev, "Failed to enable regulators\n");
+		goto xclk_off;
+	}
+
+	usleep_range(1, 2);
+	gpiod_set_value_cansleep(imx290->rst_gpio, 1);
+	usleep_range(30000, 31000);
+
+	return 0;
+
+xclk_off:
+	clk_disable_unprepare(imx290->xclk);
+	return ret;
+}
+
+/* Stop streaming */
+static int imx290_stop_streaming(struct imx290 *imx290)
+{
+	int ret;
+
+	ret = imx290_write_reg(imx290, IMX290_STANDBY, 0x01);
+	if (ret < 0)
+		return ret;
+
+	msleep(30);
+
+	return imx290_write_reg(imx290, IMX290_XMSTA, 0x01);
+}
+
+static void imx290_set_power_off(struct imx290 *imx290)
+{
+	clk_disable_unprepare(imx290->xclk);
+	gpiod_set_value_cansleep(imx290->rst_gpio, 0);
+	regulator_bulk_disable(IMX290_NUM_SUPPLIES, imx290->supplies);
+}
+
+static int imx290_set_ctrl(struct v4l2_ctrl *ctrl)
+{
+	struct imx290 *imx290 = container_of(ctrl->handler,
+					     struct imx290, ctrls);
+	int ret = 0;
+
+	/* V4L2 controls values will be applied only when power is already up */
+	if (!pm_runtime_get_if_in_use(imx290->dev))
+		return 0;
+
+	switch (ctrl->id) {
+	case V4L2_CID_GAIN:
+		ret = imx290_set_gain(imx290, ctrl->val);
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	pm_runtime_put(imx290->dev);
+
+	return ret;
+}
+
+static const struct v4l2_ctrl_ops imx290_ctrl_ops = {
+	.s_ctrl = imx290_set_ctrl,
+};
+
+static int imx290_enum_mbus_code(struct v4l2_subdev *sd,
+				 struct v4l2_subdev_pad_config *cfg,
+				 struct v4l2_subdev_mbus_code_enum *code)
+{
+	if (code->index >= ARRAY_SIZE(imx290_formats))
+		return -EINVAL;
+
+	code->code = imx290_formats[code->index].code;
+
+	return 0;
+}
+
+static int imx290_get_fmt(struct v4l2_subdev *sd,
+			  struct v4l2_subdev_pad_config *cfg,
+			  struct v4l2_subdev_format *fmt)
+{
+	struct imx290 *imx290 = to_imx290(sd);
+	struct v4l2_mbus_framefmt *framefmt;
+
+	mutex_lock(&imx290->lock);
+
+	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY)
+		framefmt = v4l2_subdev_get_try_format(&imx290->sd, cfg,
+						      fmt->pad);
+	else
+		framefmt = &imx290->current_format;
+
+	fmt->format = *framefmt;
+
+	mutex_unlock(&imx290->lock);
+
+	return 0;
+}
+
+static int imx290_set_fmt(struct v4l2_subdev *sd,
+			  struct v4l2_subdev_pad_config *cfg,
+		      struct v4l2_subdev_format *fmt)
+{
+	struct imx290 *imx290 = to_imx290(sd);
+	const struct imx290_mode *mode;
+	struct v4l2_mbus_framefmt *format;
+	int i, ret = 0;
+
+	mutex_lock(&imx290->lock);
+
+	mode = v4l2_find_nearest_size(imx290_modes,
+				      ARRAY_SIZE(imx290_modes),
+				      width, height,
+				      fmt->format.width, fmt->format.height);
+
+	fmt->format.width = mode->width;
+	fmt->format.height = mode->height;
+
+	for (i = 0; i < ARRAY_SIZE(imx290_formats); i++)
+		if (imx290_formats[i].code == fmt->format.code)
+			break;
+
+	if (i >= ARRAY_SIZE(imx290_formats))
+		i = 0;
+
+	fmt->format.code = imx290_formats[i].code;
+	fmt->format.field = V4L2_FIELD_NONE;
+
+	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
+		format = v4l2_subdev_get_try_format(sd, cfg, fmt->pad);
+	} else {
+		format = &imx290->current_format;
+		__v4l2_ctrl_s_ctrl(imx290->link_freq, mode->link_freq_index);
+		__v4l2_ctrl_s_ctrl_int64(imx290->pixel_rate, mode->pixel_rate);
+
+		imx290->current_mode = mode;
+	}
+
+	*format = fmt->format;
+
+	mutex_unlock(&imx290->lock);
+
+	return ret;
+}
+
+static int imx290_entity_init_cfg(struct v4l2_subdev *subdev,
+				  struct v4l2_subdev_pad_config *cfg)
+{
+	struct v4l2_subdev_format fmt = { 0 };
+
+	fmt.which = cfg ? V4L2_SUBDEV_FORMAT_TRY : V4L2_SUBDEV_FORMAT_ACTIVE;
+	fmt.format.width = 1920;
+	fmt.format.height = 1080;
+
+	imx290_set_fmt(subdev, cfg, &fmt);
+
+	return 0;
+}
+
+static int imx290_write_current_format(struct imx290 *imx290,
+				       struct v4l2_mbus_framefmt *format)
+{
+	int ret;
+
+	switch (format->code) {
+	case MEDIA_BUS_FMT_SRGGB10_1X10:
+		ret = imx290_set_register_array(imx290, imx290_10bit_settings,
+					ARRAY_SIZE(imx290_10bit_settings));
+		if (ret < 0) {
+			dev_err(imx290->dev, "Could not set format registers\n");
+			return ret;
+		}
+		break;
+	default:
+		dev_err(imx290->dev, "Unknown pixel format\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/* Start streaming */
+static int imx290_start_streaming(struct imx290 *imx290)
+{
+	int ret;
+
+	/* Set init register settings */
+	ret = imx290_set_register_array(imx290, imx290_global_init_settings,
+				ARRAY_SIZE(imx290_global_init_settings));
+	if (ret < 0) {
+		dev_err(imx290->dev, "Could not set init registers\n");
+		return ret;
+	}
+
+	/* Set current frame format */
+	ret = imx290_write_current_format(imx290, &imx290->current_format);
+	if (ret < 0) {
+		dev_err(imx290->dev, "Could not set frame format\n");
+		return ret;
+	}
+
+	/* Apply default values of current mode */
+	ret = imx290_set_register_array(imx290, imx290->current_mode->data,
+					imx290->current_mode->data_size);
+	if (ret < 0) {
+		dev_err(imx290->dev, "Could not set current mode\n");
+		return ret;
+	}
+
+	/* Apply customized values from user */
+	ret = v4l2_ctrl_handler_setup(imx290->sd.ctrl_handler);
+	if (ret) {
+		dev_err(imx290->dev, "Could not sync v4l2 controls\n");
+		return ret;
+	}
+
+	ret = imx290_write_reg(imx290, IMX290_STANDBY, 0x00);
+	if (ret < 0)
+		return ret;
+
+	msleep(30);
+
+	/* Start streaming */
+	return imx290_write_reg(imx290, IMX290_XMSTA, 0x00);
+}
+
+static int imx290_set_stream(struct v4l2_subdev *sd, int enable)
+{
+	struct imx290 *imx290 = to_imx290(sd);
+	int ret = 0;
+
+	if (enable) {
+		ret = pm_runtime_get_sync(imx290->dev);
+		if (ret < 0) {
+			pm_runtime_put_noidle(imx290->dev);
+			goto unlock_and_return;
+		}
+
+		ret = imx290_start_streaming(imx290);
+		if (ret) {
+			dev_err(imx290->dev, "Start stream failed\n");
+			pm_runtime_put(imx290->dev);
+			goto unlock_and_return;
+		}
+	} else {
+		imx290_stop_streaming(imx290);
+		pm_runtime_put(imx290->dev);
+	}
+
+unlock_and_return:
+
+	return ret;
+}
+
+static int imx290_get_regulators(struct device *dev, struct imx290 *imx290)
+{
+	unsigned int i;
+
+	for (i = 0; i < IMX290_NUM_SUPPLIES; i++)
+		imx290->supplies[i].supply = imx290_supply_name[i];
+
+	return devm_regulator_bulk_get(dev, IMX290_NUM_SUPPLIES,
+				       imx290->supplies);
+}
+
+static int __maybe_unused imx290_runtime_resume(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+	struct imx290 *imx290 = to_imx290(sd);
+
+	return imx290_set_power_on(imx290);
+}
+
+static int __maybe_unused imx290_runtime_suspend(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+	struct imx290 *imx290 = to_imx290(sd);
+
+	imx290_set_power_off(imx290);
+
+	return 0;
+}
+
+static const struct dev_pm_ops imx290_pm_ops = {
+	SET_RUNTIME_PM_OPS(imx290_runtime_suspend,
+			   imx290_runtime_resume, NULL)
+};
+
+static const struct v4l2_subdev_video_ops imx290_video_ops = {
+	.s_stream = imx290_set_stream,
+};
+
+static const struct v4l2_subdev_pad_ops imx290_pad_ops = {
+	.init_cfg = imx290_entity_init_cfg,
+	.enum_mbus_code = imx290_enum_mbus_code,
+	.get_fmt = imx290_get_fmt,
+	.set_fmt = imx290_set_fmt,
+};
+
+static const struct v4l2_subdev_ops imx290_subdev_ops = {
+	.video = &imx290_video_ops,
+	.pad = &imx290_pad_ops,
+};
+
+static const struct media_entity_operations imx290_subdev_entity_ops = {
+	.link_validate = v4l2_subdev_link_validate,
+};
+
+static int imx290_probe(struct i2c_client *client)
+{
+	struct device *dev = &client->dev;
+	struct fwnode_handle *endpoint;
+	struct imx290 *imx290;
+	u32 xclk_freq;
+	int ret;
+
+	imx290 = devm_kzalloc(dev, sizeof(*imx290), GFP_KERNEL);
+	if (!imx290)
+		return -ENOMEM;
+
+	imx290->dev = dev;
+	imx290->regmap = devm_regmap_init_i2c(client, &imx290_regmap_config);
+	if (IS_ERR(imx290->regmap)) {
+		dev_err(dev, "Unable to initialize I2C\n");
+		return -ENODEV;
+	}
+
+	endpoint = fwnode_graph_get_next_endpoint(dev_fwnode(dev), NULL);
+	if (!endpoint) {
+		dev_err(dev, "Endpoint node not found\n");
+		return -EINVAL;
+	}
+
+	ret = v4l2_fwnode_endpoint_alloc_parse(endpoint, &imx290->ep);
+	fwnode_handle_put(endpoint);
+	if (ret) {
+		dev_err(dev, "Parsing endpoint node failed\n");
+		return ret;
+	}
+
+	if (!imx290->ep.nr_of_link_frequencies) {
+		dev_err(dev, "link-frequency property not found in DT\n");
+		return -EINVAL;
+	}
+
+	if (imx290->ep.link_frequencies[0] != IMX290_DEFAULT_LINK_FREQ) {
+		dev_err(dev, "Unsupported link frequency\n");
+		return -EINVAL;
+	}
+
+	/* Only CSI2 is supported for now */
+	if (imx290->ep.bus_type != V4L2_MBUS_CSI2_DPHY) {
+		dev_err(dev, "Unsupported bus type, should be CSI2\n");
+		return -EINVAL;
+	}
+
+	/* Set default mode to max resolution */
+	imx290->current_mode = &imx290_modes[0];
+
+	/* get system clock (xclk) */
+	imx290->xclk = devm_clk_get(dev, "xclk");
+	if (IS_ERR(imx290->xclk)) {
+		dev_err(dev, "Could not get xclk");
+		return PTR_ERR(imx290->xclk);
+	}
+
+	ret = of_property_read_u32(dev->of_node, "clock-frequency", &xclk_freq);
+	if (ret) {
+		dev_err(dev, "Could not get xclk frequency\n");
+		return ret;
+	}
+
+	/* external clock must be 37.125 MHz */
+	if (xclk_freq != 37125000) {
+		dev_err(dev, "External clock frequency %u is not supported\n",
+			xclk_freq);
+		return -EINVAL;
+	}
+
+	ret = clk_set_rate(imx290->xclk, xclk_freq);
+	if (ret) {
+		dev_err(dev, "Could not set xclk frequency\n");
+		return ret;
+	}
+
+	ret = imx290_get_regulators(dev, imx290);
+	if (ret < 0) {
+		dev_err(dev, "Cannot get regulators\n");
+		return ret;
+	}
+
+	imx290->rst_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_ASIS);
+	if (IS_ERR(imx290->rst_gpio)) {
+		dev_err(dev, "Cannot get reset gpio\n");
+		return PTR_ERR(imx290->rst_gpio);
+	}
+
+	mutex_init(&imx290->lock);
+
+	v4l2_ctrl_handler_init(&imx290->ctrls, 3);
+
+	v4l2_ctrl_new_std(&imx290->ctrls, &imx290_ctrl_ops,
+			  V4L2_CID_GAIN, 0, 72, 1, 0);
+	imx290->link_freq = v4l2_ctrl_new_int_menu(&imx290->ctrls,
+					&imx290_ctrl_ops,
+					V4L2_CID_LINK_FREQ,
+					ARRAY_SIZE(imx290_link_freq) - 1,
+					0, imx290_link_freq);
+	if (imx290->link_freq)
+		imx290->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;
+
+	imx290->pixel_rate = v4l2_ctrl_new_std(&imx290->ctrls, &imx290_ctrl_ops,
+					       V4L2_CID_PIXEL_RATE, 1,
+					       INT_MAX, 1,
+					       imx290_modes[0].pixel_rate);
+
+	imx290->sd.ctrl_handler = &imx290->ctrls;
+
+	if (imx290->ctrls.error) {
+		dev_err(dev, "Control initialization error %d\n",
+			imx290->ctrls.error);
+		ret = imx290->ctrls.error;
+		goto free_ctrl;
+	}
+
+	v4l2_i2c_subdev_init(&imx290->sd, client, &imx290_subdev_ops);
+	imx290->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+	imx290->sd.dev = &client->dev;
+	imx290->sd.entity.ops = &imx290_subdev_entity_ops;
+	imx290->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
+
+	imx290->pad.flags = MEDIA_PAD_FL_SOURCE;
+	ret = media_entity_pads_init(&imx290->sd.entity, 1, &imx290->pad);
+	if (ret < 0) {
+		dev_err(dev, "Could not register media entity\n");
+		goto free_ctrl;
+	}
+
+	ret = v4l2_async_register_subdev(&imx290->sd);
+	if (ret < 0) {
+		dev_err(dev, "Could not register v4l2 device\n");
+		goto free_entity;
+	}
+
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
+	pm_runtime_idle(dev);
+
+	return 0;
+
+free_entity:
+	media_entity_cleanup(&imx290->sd.entity);
+free_ctrl:
+	v4l2_ctrl_handler_free(&imx290->ctrls);
+	mutex_destroy(&imx290->lock);
+
+	return ret;
+}
+
+static int imx290_remove(struct i2c_client *client)
+{
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+	struct imx290 *imx290 = to_imx290(sd);
+
+	v4l2_async_unregister_subdev(sd);
+	media_entity_cleanup(&sd->entity);
+	v4l2_ctrl_handler_free(sd->ctrl_handler);
+
+	mutex_destroy(&imx290->lock);
+
+	pm_runtime_disable(imx290->dev);
+	if (!pm_runtime_status_suspended(imx290->dev))
+		imx290_set_power_off(imx290);
+	pm_runtime_set_suspended(imx290->dev);
+
+	return 0;
+}
+
+static const struct of_device_id imx290_of_match[] = {
+	{ .compatible = "sony,imx290" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, imx290_of_match);
+
+static struct i2c_driver imx290_i2c_driver = {
+	.probe_new  = imx290_probe,
+	.remove = imx290_remove,
+	.driver = {
+		.name  = "imx290",
+		.pm = &imx290_pm_ops,
+		.of_match_table = of_match_ptr(imx290_of_match),
+	},
+};
+
+module_i2c_driver(imx290_i2c_driver);
+
+MODULE_DESCRIPTION("Sony IMX290 CMOS Image Sensor Driver");
+MODULE_AUTHOR("FRAMOS GmbH");
+MODULE_AUTHOR("Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>");
+MODULE_LICENSE("GPL v2");