diff mbox

[v6,2/2] drm/bridge: Add I2C based driver for ps8640 bridge

Message ID 1450150210-21951-2-git-send-email-jitao.shi@mediatek.com (mailing list archive)
State New, archived
Headers show

Commit Message

Jitao Shi Dec. 15, 2015, 3:30 a.m. UTC 
This patch adds drm_bridge driver for parade DSI to eDP bridge chip.

Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
---
Changes since v5
-fix compile errors when CONFIG_GPIOLIB=n
---
 drivers/gpu/drm/bridge/Kconfig         |   10 +
 drivers/gpu/drm/bridge/Makefile        |    1 +
 drivers/gpu/drm/bridge/parade-ps8640.c |  472 ++++++++++++++++++++++++++++++++
 3 files changed, 483 insertions(+)
 create mode 100644 drivers/gpu/drm/bridge/parade-ps8640.c

Comments

Daniel Kurtz Dec. 15, 2015, 6:58 a.m. UTC | #1 
On Tue, Dec 15, 2015 at 11:30 AM, Jitao Shi <jitao.shi@mediatek.com> wrote:
> This patch adds drm_bridge driver for parade DSI to eDP bridge chip.
>
> Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
> ---
> Changes since v5
> -fix compile errors when CONFIG_GPIOLIB=n
> ---
>  drivers/gpu/drm/bridge/Kconfig         |   10 +
>  drivers/gpu/drm/bridge/Makefile        |    1 +
>  drivers/gpu/drm/bridge/parade-ps8640.c |  472 ++++++++++++++++++++++++++++++++
>  3 files changed, 483 insertions(+)
>  create mode 100644 drivers/gpu/drm/bridge/parade-ps8640.c
>
> diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
> index 6dddd39..dcfdbc9 100644
> --- a/drivers/gpu/drm/bridge/Kconfig
> +++ b/drivers/gpu/drm/bridge/Kconfig
> @@ -41,4 +41,14 @@ config DRM_PARADE_PS8622
>         ---help---
>           Parade eDP-LVDS bridge chip driver.
>
> +config DRM_PARADE_PS8640
> +       tristate "Parade PS8640 MIPI DSI to eDP Converter"
> +       depends on OF
> +       select DRM_KMS_HELPER
> +       select DRM_PANEL
> +       ---help---
> +         Choose this option if you have PS8640 for display
> +         The PS8640 is a high-performance and low-power
> +         MIPI DSI to eDP converter
> +
>  endmenu
> diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
> index d4e28be..272e3c01 100644
> --- a/drivers/gpu/drm/bridge/Makefile
> +++ b/drivers/gpu/drm/bridge/Makefile
> @@ -4,3 +4,4 @@ obj-$(CONFIG_DRM_DW_HDMI) += dw_hdmi.o
>  obj-$(CONFIG_DRM_DW_HDMI_AHB_AUDIO) += dw_hdmi-ahb-audio.o
>  obj-$(CONFIG_DRM_NXP_PTN3460) += nxp-ptn3460.o
>  obj-$(CONFIG_DRM_PARADE_PS8622) += parade-ps8622.o
> +obj-$(CONFIG_DRM_PARADE_PS8640) += parade-ps8640.o
> diff --git a/drivers/gpu/drm/bridge/parade-ps8640.c b/drivers/gpu/drm/bridge/parade-ps8640.c
> new file mode 100644
> index 0000000..bf0c3c37
> --- /dev/null
> +++ b/drivers/gpu/drm/bridge/parade-ps8640.c
> @@ -0,0 +1,472 @@
> +/*
> + * Copyright (c) 2014 MediaTek Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/err.h>
> +#include <linux/gpio.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/i2c.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_gpio.h>
> +#include <linux/of_graph.h>
> +#include <linux/regulator/consumer.h>
> +
> +#include <drm/drm_panel.h>
> +
> +#include <drmP.h>
> +#include <drm_crtc_helper.h>
> +#include <drm_crtc.h>
> +#include <drm_mipi_dsi.h>
> +#include <drm_atomic_helper.h>
> +
> +#define PAGE2_GPIO_L           0xa6
> +#define PAGE2_GPIO_H           0xa7
> +#define PS_GPIO9               BIT(1)
> +#define PAGE2_I2C_BYPASS       0xea
> +#define I2C_BYPASS_EN          0xd0
> +
> +#define PAGE3_SET_ADD          0xfe
> +#define PAGE3_SET_VAL          0xff
> +#define VDO_CTL_ADD            0x13
> +#define VDO_DIS                        0x18
> +#define VDO_EN                 0x1c
> +
> +#define PAGE4_REV_L            0xf0
> +#define PAGE4_REV_H            0xf1
> +#define PAGE4_CHIP_L           0xf2
> +#define PAGE4_CHIP_H           0xf3
> +
> +#define bridge_to_ps8640(e)    container_of(e, struct ps8640, bridge)
> +#define connector_to_ps8640(e) container_of(e, struct ps8640, connector)
> +
> +struct ps8640 {
> +       struct drm_connector connector;
> +       struct drm_bridge bridge;
> +       struct i2c_client *page[6];
> +       struct ps8640_driver_data *driver_data;
> +       struct regulator *pwr_1v2_supply;
> +       struct regulator *pwr_3v3_supply;
> +       struct drm_panel *panel;
> +       struct gpio_desc *gpio_rst_n;
> +       struct gpio_desc *gpio_slp_n;
> +       struct gpio_desc *gpio_mode_sel_n;
> +       bool enabled;
> +};
> +
> +static int ps8640_regr(struct i2c_client *client, u8 reg, u8 *value)
> +{
> +       int ret;
> +
> +       ret = i2c_master_send(client, &reg, 1);
> +       if (ret <= 0) {
> +               dev_err(&client->dev, "Failed to send i2c command, ret=%d\n",
> +                       ret);
> +               return ret;
> +       }
> +
> +       ret = i2c_master_recv(client, value, 1);
> +       if (ret <= 0) {
> +               dev_err(&client->dev, "Failed to recv i2c data, ret=%d\n", ret);
> +               return ret;
> +       }

i2c_transfer should be a bit more efficient for reading one byte.

> +
> +       return 0;
> +}
> +
> +static int ps8640_regw(struct i2c_client *client, u8 reg, u8 value)
> +{
> +       int ret;
> +       char buf[2];
> +
> +       buf[0] = reg;
> +       buf[1] = value;
> +       ret = i2c_master_send(client, buf, ARRAY_SIZE(buf));
> +       if (ret <= 0) {
> +               dev_err(&client->dev, "Failed to send i2c command, ret=%d\n",
> +                       ret);
> +               return ret;
> +       }
> +
> +       return 0;
> +}
> +
> +static bool ps8640_check_valid_id(struct ps8640 *ps_bridge)
> +{
> +       struct i2c_client *client = ps_bridge->page[4];
> +       u8 rev_id_low, rev_id_high, chip_id_low, chip_id_high;
> +       int retry_cnt = 0;
> +
> +       do {
> +               ps8640_regr(client, PAGE4_CHIP_H, &chip_id_high);

Check return value and propagate if non-zero.

> +               if (chip_id_high != 0x30)
> +                       dev_info(&client->dev, "chip_id_high = 0x%x\n",
> +                                chip_id_high);
> +       } while ((retry_cnt++ < 2) && (chip_id_high != 0x30));

Why is this loop retrying?
What could be happening here?
Please add a comment.

> +
> +       ps8640_regr(client, PAGE4_REV_L, &rev_id_low);
> +       ps8640_regr(client, PAGE4_REV_H, &rev_id_high);
> +       ps8640_regr(client, PAGE4_CHIP_L, &chip_id_low);

Can you just read all 4 bytes in a single i2c transaction?

> +
> +       if ((rev_id_low == 0x00) && (rev_id_high == 0x0a) &&
> +           (chip_id_low == 0x00) && (chip_id_high == 0x30))
> +               return true;
> +
> +       return false;

return -ENODEV if no device is found?

> +}
> +
> +static void ps8640_show_mcu_fw_version(struct ps8640 *ps_bridge)
> +{
> +       struct i2c_client *client = ps_bridge->page[5];
> +       u8 major_ver, minor_ver;
> +
> +       ps8640_regr(client, 0x4, &major_ver);
> +       ps8640_regr(client, 0x5, &minor_ver);

Please #define these FW version registers.
Also, can you read them in a single i2c transaction?

> +
> +       DRM_INFO_ONCE("ps8640 rom fw version %d.%d\n", major_ver, minor_ver);
> +}
> +
> +static int ps8640_bdg_enable(struct ps8640 *ps_bridge)
> +{
> +       struct i2c_client *client = ps_bridge->page[3];
> +
> +       if (ps8640_check_valid_id(ps_bridge)) {

Usually it is prefered to fail fast, so:

    ret = ps8640_check_valid_id(ps_bridge);
    if (ret)
      return ret;
    ...
    return 0;


> +               ps8640_regw(client, PAGE3_SET_ADD, VDO_CTL_ADD);
> +               ps8640_regw(client, PAGE3_SET_VAL, VDO_DIS);

Combine into 1 i2c transaction.

> +               ps8640_regw(client, PAGE3_SET_ADD, VDO_CTL_ADD);
> +               ps8640_regw(client, PAGE3_SET_VAL, VDO_DIS);

Why are you doing this twice?
Add a comment.

> +               return 0;
> +       }
> +
> +       return -EINVAL;
> +}
> +
> +static void ps8640_prepare(struct ps8640 *ps_bridge)
> +{
> +       struct i2c_client *client = ps_bridge->page[2];
> +       int err, retry_cnt = 0;
> +       u8 set_vdo_done;
> +
> +       if (ps_bridge->enabled)
> +               return;
> +
> +       err = drm_panel_prepare(ps_bridge->panel);
> +       if (err < 0) {
> +               DRM_ERROR("failed to prepare panel: %d\n", err);
> +               return;
> +       }
> +
> +       /* delay for power stable */
> +       usleep_range(500, 700);
> +
> +       err = regulator_enable(ps_bridge->pwr_1v2_supply);
> +       if (err < 0) {
> +               DRM_ERROR("failed to enable vdd12-supply: %d\n", err);
> +               goto err_panel_unprepare;
> +       }
> +
> +       err = regulator_enable(ps_bridge->pwr_3v3_supply);
> +       if (err < 0) {
> +               DRM_ERROR("failed to enable vdd33-supply: %d\n", err);
> +               goto err_regulator_disable;

Slightly less confusing:

  goto err_regulator_1v2_disable;

> +       }
> +
> +       gpiod_set_value(ps_bridge->gpio_slp_n, 1);
> +       gpiod_set_value(ps_bridge->gpio_rst_n, 0);
> +       usleep_range(500, 700);
> +       gpiod_set_value(ps_bridge->gpio_rst_n, 1);
> +
> +       do {
> +               msleep(50);

50 ms seems pretty slow polling interval.
How long is this expected to take?

> +               ps8640_regr(client, PAGE2_GPIO_H, &set_vdo_done);
> +       } while ((retry_cnt++ < 70) && ((set_vdo_done & PS_GPIO9) != PS_GPIO9));
> +
> +       ps8640_show_mcu_fw_version(ps_bridge);
> +       ps_bridge->enabled = true;
> +
> +       return;
> +
> +err_regulator_disable:
> +       regulator_disable(ps_bridge->pwr_1v2_supply);
> +err_panel_unprepare:
> +       drm_panel_unprepare(ps_bridge->panel);
> +}
> +
> +static void ps8640_pre_enable(struct drm_bridge *bridge)
> +{
> +       struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
> +
> +       ps8640_prepare(ps_bridge);
> +}
> +
> +static void ps8640_enable(struct drm_bridge *bridge)
> +{
> +       struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
> +       int err;
> +
> +       ps8640_bdg_enable(ps_bridge);
> +
> +       err = drm_panel_enable(ps_bridge->panel);
> +       if (err < 0)
> +               DRM_ERROR("failed to enable panel: %d\n", err);
> +}
> +
> +static void ps8640_disable(struct drm_bridge *bridge)
> +{
> +       struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
> +       int err;
> +
> +       if (!ps_bridge->enabled)
> +               return;
> +
> +       ps_bridge->enabled = false;
> +
> +       err = drm_panel_disable(ps_bridge->panel);
> +       if (err < 0)
> +               DRM_ERROR("failed to disable panel: %d\n", err);
> +
> +       regulator_disable(ps_bridge->pwr_1v2_supply);
> +       regulator_disable(ps_bridge->pwr_3v3_supply);

Not sure if it matters, but...
  since you enabled them 1v2 then 3v3, its usually better to turn them
off in opposite order, so: 3v3 then 1v2.

> +       gpiod_set_value(ps_bridge->gpio_rst_n, 0);
> +       gpiod_set_value(ps_bridge->gpio_slp_n, 0);
> +}
> +
> +static void ps8640_post_disable(struct drm_bridge *bridge)
> +{
> +       struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
> +       int err;
> +
> +       err = drm_panel_unprepare(ps_bridge->panel);
> +       if (err)
> +               DRM_ERROR("failed to unprepare panel: %d\n", err);
> +}
> +
> +static int ps8640_get_modes(struct drm_connector *connector)
> +{
> +       struct ps8640 *ps_bridge = connector_to_ps8640(connector);
> +       struct i2c_client *client = ps_bridge->page[2];
> +
> +       ps8640_prepare(ps_bridge);
> +       ps8640_regw(client, PAGE2_I2C_BYPASS, I2C_BYPASS_EN);

Do you need to unset bypass mode after getting modes?
If not, perhaps you can just set this once during prepare?

> +
> +       return drm_panel_get_modes(ps_bridge->panel);
> +}
> +
> +static struct drm_encoder *ps8640_best_encoder(struct drm_connector *connector)
> +{
> +       struct ps8640 *ps_bridge;
> +
> +       ps_bridge = connector_to_ps8640(connector);
> +       return ps_bridge->bridge.encoder;
> +}
> +
> +static const struct drm_connector_helper_funcs
> +       ps8640_connector_helper_funcs = {

Indentation looks a bit funny.  I think you want another tab here.

> +       .get_modes = ps8640_get_modes,
> +       .best_encoder = ps8640_best_encoder,
> +};
> +
> +static enum drm_connector_status ps8640_detect(struct drm_connector *connector,
> +                                              bool force)
> +{
> +       return connector_status_connected;

Always?

> +}
> +
> +static void ps8640_connector_destroy(struct drm_connector *connector)
> +{
> +       drm_connector_unregister(connector);
> +       drm_connector_cleanup(connector);
> +}
> +
> +static const struct drm_connector_funcs ps8640_connector_funcs = {
> +       .dpms = drm_atomic_helper_connector_dpms,
> +       .fill_modes = drm_helper_probe_single_connector_modes,
> +       .detect = ps8640_detect,
> +       .destroy = ps8640_connector_destroy,
> +       .reset = drm_atomic_helper_connector_reset,
> +       .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
> +       .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> +};
> +
> +int ps8640_bridge_attach(struct drm_bridge *bridge)
> +{
> +       struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
> +       int ret;
> +
> +       if (!bridge->encoder) {
> +               DRM_ERROR("Parent encoder object not found");
> +               return -ENODEV;
> +       }
> +
> +       ret = drm_connector_init(bridge->dev, &ps_bridge->connector,
> +                                &ps8640_connector_funcs,
> +                                DRM_MODE_CONNECTOR_eDP);
> +
> +       if (ret) {
> +               DRM_ERROR("Failed to initialize connector with drm: %d\n", ret);
> +               return ret;
> +       }
> +
> +       drm_connector_helper_add(&ps_bridge->connector,
> +                                &ps8640_connector_helper_funcs);
> +       drm_connector_register(&ps_bridge->connector);
> +
> +       ps_bridge->connector.dpms = DRM_MODE_DPMS_ON;
> +       drm_mode_connector_attach_encoder(&ps_bridge->connector,
> +                                         bridge->encoder);
> +
> +       if (ps_bridge->panel)
> +               drm_panel_attach(ps_bridge->panel, &ps_bridge->connector);
> +
> +       return ret;
> +}
> +
> +static bool ps8640_bridge_mode_fixup(struct drm_bridge *bridge,
> +                                    const struct drm_display_mode *mode,
> +                                    struct drm_display_mode *adjusted_mode)
> +{
> +       return true;
> +}
> +
> +static const struct drm_bridge_funcs ps8640_bridge_funcs = {
> +       .attach = ps8640_bridge_attach,
> +       .mode_fixup = ps8640_bridge_mode_fixup,
> +       .disable = ps8640_disable,
> +       .post_disable = ps8640_post_disable,
> +       .pre_enable = ps8640_pre_enable,
> +       .enable = ps8640_enable,
> +};
> +
> +static int ps8640_probe(struct i2c_client *client,
> +                       const struct i2c_device_id *id)
> +{
> +       struct device *dev = &client->dev;
> +       struct ps8640 *ps_bridge;
> +       struct device_node *np = dev->of_node;
> +       struct device_node *port, *out_ep;
> +       struct device_node *panel_node = NULL;
> +       int i, ret;
> +
> +       ps_bridge = devm_kzalloc(dev, sizeof(*ps_bridge), GFP_KERNEL);
> +       if (!ps_bridge)
> +               return -ENOMEM;
> +
> +       /* port@1 is ps8640 output port */
> +       port = of_graph_get_port_by_id(np, 1);
> +       if (port) {
> +               out_ep = of_get_child_by_name(port, "endpoint");
> +               of_node_put(port);
> +               if (out_ep) {
> +                       panel_node = of_graph_get_remote_port_parent(out_ep);
> +                       of_node_put(out_ep);
> +               }
> +       }
> +       if (panel_node) {
> +               ps_bridge->panel = of_drm_find_panel(panel_node);
> +               of_node_put(panel_node);
> +               if (!ps_bridge->panel)
> +                       return -EPROBE_DEFER;
> +       }
> +
> +       ps_bridge->page[0] = client;
> +       for (i = 1; i < 6; i++)
> +               ps_bridge->page[i] = i2c_new_dummy(client->adapter,
> +                                                  client->addr + i);

Can you add a comment somewhere explaining what these extra i2c clients are for?

Also, if after this in probe() fails, unregister our these i2c_clients.
Or, move this after the devm_*() calls.

> +
> +       ps_bridge->pwr_3v3_supply = devm_regulator_get(dev, "vdd33");
> +       if (IS_ERR(ps_bridge->pwr_3v3_supply)) {
> +               ret = PTR_ERR(ps_bridge->pwr_3v3_supply);
> +               dev_err(dev, "cannot get vdd33 supply: %d\n", ret);
> +               return ret;
> +       }
> +
> +       ps_bridge->pwr_1v2_supply = devm_regulator_get(dev, "vdd12");
> +       if (IS_ERR(ps_bridge->pwr_1v2_supply)) {
> +               ret = PTR_ERR(ps_bridge->pwr_1v2_supply);
> +               dev_err(dev, "cannot get vdd12 supply: %d\n", ret);
> +               return ret;
> +       }
> +
> +       ps_bridge->gpio_mode_sel_n = devm_gpiod_get(&client->dev, "mode-sel",
> +                                                   GPIOD_OUT_HIGH);
> +       if (IS_ERR(ps_bridge->gpio_mode_sel_n)) {
> +               ret = PTR_ERR(ps_bridge->gpio_mode_sel_n);
> +               dev_err(dev, "cannot get gpio_mode_sel_n %d\n", ret);
> +               return ret;
> +       }
> +
> +       ps_bridge->gpio_slp_n = devm_gpiod_get(&client->dev, "sleep",
> +                                              GPIOD_OUT_HIGH);
> +       if (IS_ERR(ps_bridge->gpio_slp_n)) {
> +               ret = PTR_ERR(ps_bridge->gpio_slp_n);
> +               dev_err(dev, "cannot get gpio_slp_n: %d\n", ret);
> +               return ret;
> +       }
> +
> +       ps_bridge->gpio_rst_n = devm_gpiod_get(&client->dev, "reset",
> +                                              GPIOD_OUT_HIGH);
> +       if (IS_ERR(ps_bridge->gpio_rst_n)) {
> +               ret = PTR_ERR(ps_bridge->gpio_rst_n);
> +               dev_err(dev, "cannot get gpio_rst_n: %d\n", ret);
> +               return ret;
> +       }
> +
> +       ps_bridge->bridge.funcs = &ps8640_bridge_funcs;
> +       ps_bridge->bridge.of_node = dev->of_node;
> +       ret = drm_bridge_add(&ps_bridge->bridge);
> +       if (ret) {
> +               dev_err(dev, "Failed to add bridge: %d\n", ret);
> +               return ret;
> +       }
> +
> +       i2c_set_clientdata(client, ps_bridge);
> +
> +       return 0;
> +}
> +
> +static int ps8640_remove(struct i2c_client *client)
> +{
> +       struct ps8640 *ps_bridge = i2c_get_clientdata(client);
> +

i2c_unregister_device() the pages.

> +       drm_bridge_remove(&ps_bridge->bridge);
> +
> +       return 0;
> +}
> +
> +static const struct i2c_device_id ps8640_i2c_table[] = {
> +       {"parade,ps8640", 0},
> +       {},
> +};
> +MODULE_DEVICE_TABLE(i2c, ps8640_i2c_table);
> +
> +static const struct of_device_id ps8640_match[] = {
> +       { .compatible = "parade,ps8640" },
> +       {},
> +};
> +MODULE_DEVICE_TABLE(of, ps8640_match);
> +
> +static struct i2c_driver ps8640_driver = {
> +       .id_table = ps8640_i2c_table,
> +       .probe = ps8640_probe,
> +       .remove = ps8640_remove,
> +       .driver = {
> +               .name = "parade,ps8640",
> +               .of_match_table = ps8640_match,
> +       },
> +};
> +module_i2c_driver(ps8640_driver);
> +
> +MODULE_AUTHOR("Jitao Shi <jitao.shi@mediatek.com>");
> +MODULE_AUTHOR("CK Hu <ck.hu@mediatek.com>");
> +MODULE_DESCRIPTION("PARADE ps8640 DSI-eDP converter driver");
> +MODULE_LICENSE("GPL v2");
> --
> 1.7.9.5
>
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> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/dri-devel
Archit Taneja Dec. 15, 2015, 7:17 a.m. UTC | #2 
Hi,

On 12/15/2015 09:00 AM, Jitao Shi wrote:
> This patch adds drm_bridge driver for parade DSI to eDP bridge chip.
>
> Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
> ---
> Changes since v5
> -fix compile errors when CONFIG_GPIOLIB=n
> ---
>   drivers/gpu/drm/bridge/Kconfig         |   10 +
>   drivers/gpu/drm/bridge/Makefile        |    1 +
>   drivers/gpu/drm/bridge/parade-ps8640.c |  472 ++++++++++++++++++++++++++++++++
>   3 files changed, 483 insertions(+)
>   create mode 100644 drivers/gpu/drm/bridge/parade-ps8640.c
>
> diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
> index 6dddd39..dcfdbc9 100644
> --- a/drivers/gpu/drm/bridge/Kconfig
> +++ b/drivers/gpu/drm/bridge/Kconfig
> @@ -41,4 +41,14 @@ config DRM_PARADE_PS8622
>   	---help---
>   	  Parade eDP-LVDS bridge chip driver.
>
> +config DRM_PARADE_PS8640
> +	tristate "Parade PS8640 MIPI DSI to eDP Converter"
> +	depends on OF
> +	select DRM_KMS_HELPER
> +	select DRM_PANEL
> +	---help---
> +	  Choose this option if you have PS8640 for display
> +	  The PS8640 is a high-performance and low-power
> +	  MIPI DSI to eDP converter
> +
>   endmenu
> diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
> index d4e28be..272e3c01 100644
> --- a/drivers/gpu/drm/bridge/Makefile
> +++ b/drivers/gpu/drm/bridge/Makefile
> @@ -4,3 +4,4 @@ obj-$(CONFIG_DRM_DW_HDMI) += dw_hdmi.o
>   obj-$(CONFIG_DRM_DW_HDMI_AHB_AUDIO) += dw_hdmi-ahb-audio.o
>   obj-$(CONFIG_DRM_NXP_PTN3460) += nxp-ptn3460.o
>   obj-$(CONFIG_DRM_PARADE_PS8622) += parade-ps8622.o
> +obj-$(CONFIG_DRM_PARADE_PS8640) += parade-ps8640.o
> diff --git a/drivers/gpu/drm/bridge/parade-ps8640.c b/drivers/gpu/drm/bridge/parade-ps8640.c
> new file mode 100644
> index 0000000..bf0c3c37
> --- /dev/null
> +++ b/drivers/gpu/drm/bridge/parade-ps8640.c
> @@ -0,0 +1,472 @@
> +/*
> + * Copyright (c) 2014 MediaTek Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/err.h>
> +#include <linux/gpio.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/i2c.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_gpio.h>
> +#include <linux/of_graph.h>
> +#include <linux/regulator/consumer.h>
> +
> +#include <drm/drm_panel.h>
> +
> +#include <drmP.h>
> +#include <drm_crtc_helper.h>
> +#include <drm_crtc.h>
> +#include <drm_mipi_dsi.h>

This doesn't seem to be used at the moment.

<snip>

> +
> +static int ps8640_probe(struct i2c_client *client,
> +			const struct i2c_device_id *id)
> +{
> +	struct device *dev = &client->dev;
> +	struct ps8640 *ps_bridge;
> +	struct device_node *np = dev->of_node;
> +	struct device_node *port, *out_ep;
> +	struct device_node *panel_node = NULL;
> +	int i, ret;
> +
> +	ps_bridge = devm_kzalloc(dev, sizeof(*ps_bridge), GFP_KERNEL);
> +	if (!ps_bridge)
> +		return -ENOMEM;
> +
> +	/* port@1 is ps8640 output port */
> +	port = of_graph_get_port_by_id(np, 1);
> +	if (port) {
> +		out_ep = of_get_child_by_name(port, "endpoint");
> +		of_node_put(port);
> +		if (out_ep) {
> +			panel_node = of_graph_get_remote_port_parent(out_ep);
> +			of_node_put(out_ep);
> +		}
> +	}
> +	if (panel_node) {
> +		ps_bridge->panel = of_drm_find_panel(panel_node);
> +		of_node_put(panel_node);
> +		if (!ps_bridge->panel)
> +			return -EPROBE_DEFER;
> +	}

The driver retrieves the panel from the output port via DT, but doesn't
retrieve the DSI host from the input port?

Wouldn't this driver need to call a "mipi_dsi_attach" at some point to
link with the DSI host (and pass parameters like number of lanes, color
format etc)?

I've been working on a patchset[1] which lets i2c drivers create mipi
dsi devices. I think this would be needed for the ps8640 driver too.

[1] https://lkml.org/lkml/2015/12/10/283

Archit

> +
> +	ps_bridge->page[0] = client;
> +	for (i = 1; i < 6; i++)
> +		ps_bridge->page[i] = i2c_new_dummy(client->adapter,
> +						   client->addr + i);
> +
> +	ps_bridge->pwr_3v3_supply = devm_regulator_get(dev, "vdd33");
> +	if (IS_ERR(ps_bridge->pwr_3v3_supply)) {
> +		ret = PTR_ERR(ps_bridge->pwr_3v3_supply);
> +		dev_err(dev, "cannot get vdd33 supply: %d\n", ret);
> +		return ret;
> +	}
> +
> +	ps_bridge->pwr_1v2_supply = devm_regulator_get(dev, "vdd12");
> +	if (IS_ERR(ps_bridge->pwr_1v2_supply)) {
> +		ret = PTR_ERR(ps_bridge->pwr_1v2_supply);
> +		dev_err(dev, "cannot get vdd12 supply: %d\n", ret);
> +		return ret;
> +	}
> +
> +	ps_bridge->gpio_mode_sel_n = devm_gpiod_get(&client->dev, "mode-sel",
> +						    GPIOD_OUT_HIGH);
> +	if (IS_ERR(ps_bridge->gpio_mode_sel_n)) {
> +		ret = PTR_ERR(ps_bridge->gpio_mode_sel_n);
> +		dev_err(dev, "cannot get gpio_mode_sel_n %d\n", ret);
> +		return ret;
> +	}
> +
> +	ps_bridge->gpio_slp_n = devm_gpiod_get(&client->dev, "sleep",
> +					       GPIOD_OUT_HIGH);
> +	if (IS_ERR(ps_bridge->gpio_slp_n)) {
> +		ret = PTR_ERR(ps_bridge->gpio_slp_n);
> +		dev_err(dev, "cannot get gpio_slp_n: %d\n", ret);
> +		return ret;
> +	}
> +
> +	ps_bridge->gpio_rst_n = devm_gpiod_get(&client->dev, "reset",
> +					       GPIOD_OUT_HIGH);
> +	if (IS_ERR(ps_bridge->gpio_rst_n)) {
> +		ret = PTR_ERR(ps_bridge->gpio_rst_n);
> +		dev_err(dev, "cannot get gpio_rst_n: %d\n", ret);
> +		return ret;
> +	}
> +
> +	ps_bridge->bridge.funcs = &ps8640_bridge_funcs;
> +	ps_bridge->bridge.of_node = dev->of_node;
> +	ret = drm_bridge_add(&ps_bridge->bridge);
> +	if (ret) {
> +		dev_err(dev, "Failed to add bridge: %d\n", ret);
> +		return ret;
> +	}
> +
> +	i2c_set_clientdata(client, ps_bridge);
> +
> +	return 0;
> +}
> +
> +static int ps8640_remove(struct i2c_client *client)
> +{
> +	struct ps8640 *ps_bridge = i2c_get_clientdata(client);
> +
> +	drm_bridge_remove(&ps_bridge->bridge);
> +
> +	return 0;
> +}
> +
> +static const struct i2c_device_id ps8640_i2c_table[] = {
> +	{"parade,ps8640", 0},
> +	{},
> +};
> +MODULE_DEVICE_TABLE(i2c, ps8640_i2c_table);
> +
> +static const struct of_device_id ps8640_match[] = {
> +	{ .compatible = "parade,ps8640" },
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, ps8640_match);
> +
> +static struct i2c_driver ps8640_driver = {
> +	.id_table = ps8640_i2c_table,
> +	.probe = ps8640_probe,
> +	.remove = ps8640_remove,
> +	.driver = {
> +		.name = "parade,ps8640",
> +		.of_match_table = ps8640_match,
> +	},
> +};
> +module_i2c_driver(ps8640_driver);
> +
> +MODULE_AUTHOR("Jitao Shi <jitao.shi@mediatek.com>");
> +MODULE_AUTHOR("CK Hu <ck.hu@mediatek.com>");
> +MODULE_DESCRIPTION("PARADE ps8640 DSI-eDP converter driver");
> +MODULE_LICENSE("GPL v2");
>
diff mbox

Patch

diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index 6dddd39..dcfdbc9 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -41,4 +41,14 @@  config DRM_PARADE_PS8622
 	---help---
 	  Parade eDP-LVDS bridge chip driver.
 
+config DRM_PARADE_PS8640
+	tristate "Parade PS8640 MIPI DSI to eDP Converter"
+	depends on OF
+	select DRM_KMS_HELPER
+	select DRM_PANEL
+	---help---
+	  Choose this option if you have PS8640 for display
+	  The PS8640 is a high-performance and low-power
+	  MIPI DSI to eDP converter
+
 endmenu
diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
index d4e28be..272e3c01 100644
--- a/drivers/gpu/drm/bridge/Makefile
+++ b/drivers/gpu/drm/bridge/Makefile
@@ -4,3 +4,4 @@  obj-$(CONFIG_DRM_DW_HDMI) += dw_hdmi.o
 obj-$(CONFIG_DRM_DW_HDMI_AHB_AUDIO) += dw_hdmi-ahb-audio.o
 obj-$(CONFIG_DRM_NXP_PTN3460) += nxp-ptn3460.o
 obj-$(CONFIG_DRM_PARADE_PS8622) += parade-ps8622.o
+obj-$(CONFIG_DRM_PARADE_PS8640) += parade-ps8640.o
diff --git a/drivers/gpu/drm/bridge/parade-ps8640.c b/drivers/gpu/drm/bridge/parade-ps8640.c
new file mode 100644
index 0000000..bf0c3c37
--- /dev/null
+++ b/drivers/gpu/drm/bridge/parade-ps8640.c
@@ -0,0 +1,472 @@ 
+/*
+ * Copyright (c) 2014 MediaTek Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/of_graph.h>
+#include <linux/regulator/consumer.h>
+
+#include <drm/drm_panel.h>
+
+#include <drmP.h>
+#include <drm_crtc_helper.h>
+#include <drm_crtc.h>
+#include <drm_mipi_dsi.h>
+#include <drm_atomic_helper.h>
+
+#define PAGE2_GPIO_L		0xa6
+#define PAGE2_GPIO_H		0xa7
+#define PS_GPIO9		BIT(1)
+#define PAGE2_I2C_BYPASS	0xea
+#define I2C_BYPASS_EN		0xd0
+
+#define PAGE3_SET_ADD		0xfe
+#define PAGE3_SET_VAL		0xff
+#define VDO_CTL_ADD		0x13
+#define VDO_DIS			0x18
+#define VDO_EN			0x1c
+
+#define PAGE4_REV_L		0xf0
+#define PAGE4_REV_H		0xf1
+#define PAGE4_CHIP_L		0xf2
+#define PAGE4_CHIP_H		0xf3
+
+#define bridge_to_ps8640(e)	container_of(e, struct ps8640, bridge)
+#define connector_to_ps8640(e)	container_of(e, struct ps8640, connector)
+
+struct ps8640 {
+	struct drm_connector connector;
+	struct drm_bridge bridge;
+	struct i2c_client *page[6];
+	struct ps8640_driver_data *driver_data;
+	struct regulator *pwr_1v2_supply;
+	struct regulator *pwr_3v3_supply;
+	struct drm_panel *panel;
+	struct gpio_desc *gpio_rst_n;
+	struct gpio_desc *gpio_slp_n;
+	struct gpio_desc *gpio_mode_sel_n;
+	bool enabled;
+};
+
+static int ps8640_regr(struct i2c_client *client, u8 reg, u8 *value)
+{
+	int ret;
+
+	ret = i2c_master_send(client, &reg, 1);
+	if (ret <= 0) {
+		dev_err(&client->dev, "Failed to send i2c command, ret=%d\n",
+			ret);
+		return ret;
+	}
+
+	ret = i2c_master_recv(client, value, 1);
+	if (ret <= 0) {
+		dev_err(&client->dev, "Failed to recv i2c data, ret=%d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int ps8640_regw(struct i2c_client *client, u8 reg, u8 value)
+{
+	int ret;
+	char buf[2];
+
+	buf[0] = reg;
+	buf[1] = value;
+	ret = i2c_master_send(client, buf, ARRAY_SIZE(buf));
+	if (ret <= 0) {
+		dev_err(&client->dev, "Failed to send i2c command, ret=%d\n",
+			ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static bool ps8640_check_valid_id(struct ps8640 *ps_bridge)
+{
+	struct i2c_client *client = ps_bridge->page[4];
+	u8 rev_id_low, rev_id_high, chip_id_low, chip_id_high;
+	int retry_cnt = 0;
+
+	do {
+		ps8640_regr(client, PAGE4_CHIP_H, &chip_id_high);
+		if (chip_id_high != 0x30)
+			dev_info(&client->dev, "chip_id_high = 0x%x\n",
+				 chip_id_high);
+	} while ((retry_cnt++ < 2) && (chip_id_high != 0x30));
+
+	ps8640_regr(client, PAGE4_REV_L, &rev_id_low);
+	ps8640_regr(client, PAGE4_REV_H, &rev_id_high);
+	ps8640_regr(client, PAGE4_CHIP_L, &chip_id_low);
+
+	if ((rev_id_low == 0x00) && (rev_id_high == 0x0a) &&
+	    (chip_id_low == 0x00) && (chip_id_high == 0x30))
+		return true;
+
+	return false;
+}
+
+static void ps8640_show_mcu_fw_version(struct ps8640 *ps_bridge)
+{
+	struct i2c_client *client = ps_bridge->page[5];
+	u8 major_ver, minor_ver;
+
+	ps8640_regr(client, 0x4, &major_ver);
+	ps8640_regr(client, 0x5, &minor_ver);
+
+	DRM_INFO_ONCE("ps8640 rom fw version %d.%d\n", major_ver, minor_ver);
+}
+
+static int ps8640_bdg_enable(struct ps8640 *ps_bridge)
+{
+	struct i2c_client *client = ps_bridge->page[3];
+
+	if (ps8640_check_valid_id(ps_bridge)) {
+		ps8640_regw(client, PAGE3_SET_ADD, VDO_CTL_ADD);
+		ps8640_regw(client, PAGE3_SET_VAL, VDO_DIS);
+		ps8640_regw(client, PAGE3_SET_ADD, VDO_CTL_ADD);
+		ps8640_regw(client, PAGE3_SET_VAL, VDO_DIS);
+		return 0;
+	}
+
+	return -EINVAL;
+}
+
+static void ps8640_prepare(struct ps8640 *ps_bridge)
+{
+	struct i2c_client *client = ps_bridge->page[2];
+	int err, retry_cnt = 0;
+	u8 set_vdo_done;
+
+	if (ps_bridge->enabled)
+		return;
+
+	err = drm_panel_prepare(ps_bridge->panel);
+	if (err < 0) {
+		DRM_ERROR("failed to prepare panel: %d\n", err);
+		return;
+	}
+
+	/* delay for power stable */
+	usleep_range(500, 700);
+
+	err = regulator_enable(ps_bridge->pwr_1v2_supply);
+	if (err < 0) {
+		DRM_ERROR("failed to enable vdd12-supply: %d\n", err);
+		goto err_panel_unprepare;
+	}
+
+	err = regulator_enable(ps_bridge->pwr_3v3_supply);
+	if (err < 0) {
+		DRM_ERROR("failed to enable vdd33-supply: %d\n", err);
+		goto err_regulator_disable;
+	}
+
+	gpiod_set_value(ps_bridge->gpio_slp_n, 1);
+	gpiod_set_value(ps_bridge->gpio_rst_n, 0);
+	usleep_range(500, 700);
+	gpiod_set_value(ps_bridge->gpio_rst_n, 1);
+
+	do {
+		msleep(50);
+		ps8640_regr(client, PAGE2_GPIO_H, &set_vdo_done);
+	} while ((retry_cnt++ < 70) && ((set_vdo_done & PS_GPIO9) != PS_GPIO9));
+
+	ps8640_show_mcu_fw_version(ps_bridge);
+	ps_bridge->enabled = true;
+
+	return;
+
+err_regulator_disable:
+	regulator_disable(ps_bridge->pwr_1v2_supply);
+err_panel_unprepare:
+	drm_panel_unprepare(ps_bridge->panel);
+}
+
+static void ps8640_pre_enable(struct drm_bridge *bridge)
+{
+	struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
+
+	ps8640_prepare(ps_bridge);
+}
+
+static void ps8640_enable(struct drm_bridge *bridge)
+{
+	struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
+	int err;
+
+	ps8640_bdg_enable(ps_bridge);
+
+	err = drm_panel_enable(ps_bridge->panel);
+	if (err < 0)
+		DRM_ERROR("failed to enable panel: %d\n", err);
+}
+
+static void ps8640_disable(struct drm_bridge *bridge)
+{
+	struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
+	int err;
+
+	if (!ps_bridge->enabled)
+		return;
+
+	ps_bridge->enabled = false;
+
+	err = drm_panel_disable(ps_bridge->panel);
+	if (err < 0)
+		DRM_ERROR("failed to disable panel: %d\n", err);
+
+	regulator_disable(ps_bridge->pwr_1v2_supply);
+	regulator_disable(ps_bridge->pwr_3v3_supply);
+	gpiod_set_value(ps_bridge->gpio_rst_n, 0);
+	gpiod_set_value(ps_bridge->gpio_slp_n, 0);
+}
+
+static void ps8640_post_disable(struct drm_bridge *bridge)
+{
+	struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
+	int err;
+
+	err = drm_panel_unprepare(ps_bridge->panel);
+	if (err)
+		DRM_ERROR("failed to unprepare panel: %d\n", err);
+}
+
+static int ps8640_get_modes(struct drm_connector *connector)
+{
+	struct ps8640 *ps_bridge = connector_to_ps8640(connector);
+	struct i2c_client *client = ps_bridge->page[2];
+
+	ps8640_prepare(ps_bridge);
+	ps8640_regw(client, PAGE2_I2C_BYPASS, I2C_BYPASS_EN);
+
+	return drm_panel_get_modes(ps_bridge->panel);
+}
+
+static struct drm_encoder *ps8640_best_encoder(struct drm_connector *connector)
+{
+	struct ps8640 *ps_bridge;
+
+	ps_bridge = connector_to_ps8640(connector);
+	return ps_bridge->bridge.encoder;
+}
+
+static const struct drm_connector_helper_funcs
+	ps8640_connector_helper_funcs = {
+	.get_modes = ps8640_get_modes,
+	.best_encoder = ps8640_best_encoder,
+};
+
+static enum drm_connector_status ps8640_detect(struct drm_connector *connector,
+					       bool force)
+{
+	return connector_status_connected;
+}
+
+static void ps8640_connector_destroy(struct drm_connector *connector)
+{
+	drm_connector_unregister(connector);
+	drm_connector_cleanup(connector);
+}
+
+static const struct drm_connector_funcs ps8640_connector_funcs = {
+	.dpms = drm_atomic_helper_connector_dpms,
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.detect = ps8640_detect,
+	.destroy = ps8640_connector_destroy,
+	.reset = drm_atomic_helper_connector_reset,
+	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+int ps8640_bridge_attach(struct drm_bridge *bridge)
+{
+	struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
+	int ret;
+
+	if (!bridge->encoder) {
+		DRM_ERROR("Parent encoder object not found");
+		return -ENODEV;
+	}
+
+	ret = drm_connector_init(bridge->dev, &ps_bridge->connector,
+				 &ps8640_connector_funcs,
+				 DRM_MODE_CONNECTOR_eDP);
+
+	if (ret) {
+		DRM_ERROR("Failed to initialize connector with drm: %d\n", ret);
+		return ret;
+	}
+
+	drm_connector_helper_add(&ps_bridge->connector,
+				 &ps8640_connector_helper_funcs);
+	drm_connector_register(&ps_bridge->connector);
+
+	ps_bridge->connector.dpms = DRM_MODE_DPMS_ON;
+	drm_mode_connector_attach_encoder(&ps_bridge->connector,
+					  bridge->encoder);
+
+	if (ps_bridge->panel)
+		drm_panel_attach(ps_bridge->panel, &ps_bridge->connector);
+
+	return ret;
+}
+
+static bool ps8640_bridge_mode_fixup(struct drm_bridge *bridge,
+				     const struct drm_display_mode *mode,
+				     struct drm_display_mode *adjusted_mode)
+{
+	return true;
+}
+
+static const struct drm_bridge_funcs ps8640_bridge_funcs = {
+	.attach = ps8640_bridge_attach,
+	.mode_fixup = ps8640_bridge_mode_fixup,
+	.disable = ps8640_disable,
+	.post_disable = ps8640_post_disable,
+	.pre_enable = ps8640_pre_enable,
+	.enable = ps8640_enable,
+};
+
+static int ps8640_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
+{
+	struct device *dev = &client->dev;
+	struct ps8640 *ps_bridge;
+	struct device_node *np = dev->of_node;
+	struct device_node *port, *out_ep;
+	struct device_node *panel_node = NULL;
+	int i, ret;
+
+	ps_bridge = devm_kzalloc(dev, sizeof(*ps_bridge), GFP_KERNEL);
+	if (!ps_bridge)
+		return -ENOMEM;
+
+	/* port@1 is ps8640 output port */
+	port = of_graph_get_port_by_id(np, 1);
+	if (port) {
+		out_ep = of_get_child_by_name(port, "endpoint");
+		of_node_put(port);
+		if (out_ep) {
+			panel_node = of_graph_get_remote_port_parent(out_ep);
+			of_node_put(out_ep);
+		}
+	}
+	if (panel_node) {
+		ps_bridge->panel = of_drm_find_panel(panel_node);
+		of_node_put(panel_node);
+		if (!ps_bridge->panel)
+			return -EPROBE_DEFER;
+	}
+
+	ps_bridge->page[0] = client;
+	for (i = 1; i < 6; i++)
+		ps_bridge->page[i] = i2c_new_dummy(client->adapter,
+						   client->addr + i);
+
+	ps_bridge->pwr_3v3_supply = devm_regulator_get(dev, "vdd33");
+	if (IS_ERR(ps_bridge->pwr_3v3_supply)) {
+		ret = PTR_ERR(ps_bridge->pwr_3v3_supply);
+		dev_err(dev, "cannot get vdd33 supply: %d\n", ret);
+		return ret;
+	}
+
+	ps_bridge->pwr_1v2_supply = devm_regulator_get(dev, "vdd12");
+	if (IS_ERR(ps_bridge->pwr_1v2_supply)) {
+		ret = PTR_ERR(ps_bridge->pwr_1v2_supply);
+		dev_err(dev, "cannot get vdd12 supply: %d\n", ret);
+		return ret;
+	}
+
+	ps_bridge->gpio_mode_sel_n = devm_gpiod_get(&client->dev, "mode-sel",
+						    GPIOD_OUT_HIGH);
+	if (IS_ERR(ps_bridge->gpio_mode_sel_n)) {
+		ret = PTR_ERR(ps_bridge->gpio_mode_sel_n);
+		dev_err(dev, "cannot get gpio_mode_sel_n %d\n", ret);
+		return ret;
+	}
+
+	ps_bridge->gpio_slp_n = devm_gpiod_get(&client->dev, "sleep",
+					       GPIOD_OUT_HIGH);
+	if (IS_ERR(ps_bridge->gpio_slp_n)) {
+		ret = PTR_ERR(ps_bridge->gpio_slp_n);
+		dev_err(dev, "cannot get gpio_slp_n: %d\n", ret);
+		return ret;
+	}
+
+	ps_bridge->gpio_rst_n = devm_gpiod_get(&client->dev, "reset",
+					       GPIOD_OUT_HIGH);
+	if (IS_ERR(ps_bridge->gpio_rst_n)) {
+		ret = PTR_ERR(ps_bridge->gpio_rst_n);
+		dev_err(dev, "cannot get gpio_rst_n: %d\n", ret);
+		return ret;
+	}
+
+	ps_bridge->bridge.funcs = &ps8640_bridge_funcs;
+	ps_bridge->bridge.of_node = dev->of_node;
+	ret = drm_bridge_add(&ps_bridge->bridge);
+	if (ret) {
+		dev_err(dev, "Failed to add bridge: %d\n", ret);
+		return ret;
+	}
+
+	i2c_set_clientdata(client, ps_bridge);
+
+	return 0;
+}
+
+static int ps8640_remove(struct i2c_client *client)
+{
+	struct ps8640 *ps_bridge = i2c_get_clientdata(client);
+
+	drm_bridge_remove(&ps_bridge->bridge);
+
+	return 0;
+}
+
+static const struct i2c_device_id ps8640_i2c_table[] = {
+	{"parade,ps8640", 0},
+	{},
+};
+MODULE_DEVICE_TABLE(i2c, ps8640_i2c_table);
+
+static const struct of_device_id ps8640_match[] = {
+	{ .compatible = "parade,ps8640" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, ps8640_match);
+
+static struct i2c_driver ps8640_driver = {
+	.id_table = ps8640_i2c_table,
+	.probe = ps8640_probe,
+	.remove = ps8640_remove,
+	.driver = {
+		.name = "parade,ps8640",
+		.of_match_table = ps8640_match,
+	},
+};
+module_i2c_driver(ps8640_driver);
+
+MODULE_AUTHOR("Jitao Shi <jitao.shi@mediatek.com>");
+MODULE_AUTHOR("CK Hu <ck.hu@mediatek.com>");
+MODULE_DESCRIPTION("PARADE ps8640 DSI-eDP converter driver");
+MODULE_LICENSE("GPL v2");