Re: [PATCH v1 08/10] media: i2c: ov772x: Remove soc_camera dependencies

Sakari Ailus
2017-11-17T00:43:23Z

Hi Jacopo,

On Wed, Nov 15, 2017 at 11:56:01AM +0100, Jacopo Mondi wrote:
> Remove soc_camera framework dependencies from ov772x sensor driver.
> - Handle clock directly
> - Register async subdevice
> - Add platform specific enable/disable functions
> - Adjust build system
>
> This commit does not remove the original soc_camera based driver.
>
> Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
> ---
> drivers/media/i2c/Kconfig | 12 +++++++
> drivers/media/i2c/Makefile | 1 +
> drivers/media/i2c/ov772x.c | 88 +++++++++++++++++++++++++++++++---------------
> include/media/i2c/ov772x.h | 3 ++
> 4 files changed, 76 insertions(+), 28 deletions(-)
>
> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> index 9415389..ff251ce 100644
> --- a/drivers/media/i2c/Kconfig
> +++ b/drivers/media/i2c/Kconfig
> @@ -629,6 +629,18 @@ config VIDEO_OV5670
> To compile this driver as a module, choose M here: the
> module will be called ov5670.
>
> +config VIDEO_OV772X
> + tristate "OmniVision OV772x sensor support"
> + depends on I2C && VIDEO_V4L2
> + depends on MEDIA_CAMERA_SUPPORT
> + ---help---
> + This is a Video4Linux2 sensor-level driver for the OmniVision
> + OV772x camera.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called ov772x.
> +
> +
> config VIDEO_OV7640
> tristate "OmniVision OV7640 sensor support"
> depends on I2C && VIDEO_V4L2
> diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
> index f104650..b2459a1 100644
> --- a/drivers/media/i2c/Makefile
> +++ b/drivers/media/i2c/Makefile
> @@ -66,6 +66,7 @@ obj-$(CONFIG_VIDEO_OV5645) += ov5645.o
> obj-$(CONFIG_VIDEO_OV5647) += ov5647.o
> obj-$(CONFIG_VIDEO_OV5670) += ov5670.o
> obj-$(CONFIG_VIDEO_OV6650) += ov6650.o
> +obj-$(CONFIG_VIDEO_OV772X) += ov772x.o
> obj-$(CONFIG_VIDEO_OV7640) += ov7640.o
> obj-$(CONFIG_VIDEO_OV7670) += ov7670.o
> obj-$(CONFIG_VIDEO_OV9650) += ov9650.o
> diff --git a/drivers/media/i2c/ov772x.c b/drivers/media/i2c/ov772x.c
> index 8063835..9be7e4e 100644
> --- a/drivers/media/i2c/ov772x.c
> +++ b/drivers/media/i2c/ov772x.c
> @@ -15,6 +15,7 @@
> * published by the Free Software Foundation.
> */
>
> +#include <linux/clk.h>
> #include <linux/init.h>
> #include <linux/kernel.h>
> #include <linux/module.h>
> @@ -25,8 +26,8 @@
> #include <linux/videodev2.h>
>
> #include <media/i2c/ov772x.h>
> -#include <media/soc_camera.h>
> -#include <media/v4l2-clk.h>
> +
> +#include <media/v4l2-device.h>

Alphabetical order would be nice.

> #include <media/v4l2-ctrls.h>
> #include <media/v4l2-subdev.h>
> #include <media/v4l2-image-sizes.h>
> @@ -393,7 +394,7 @@ struct ov772x_win_size {
> struct ov772x_priv {
> struct v4l2_subdev subdev;
> struct v4l2_ctrl_handler hdl;
> - struct v4l2_clk *clk;
> + struct clk *clk;
> struct ov772x_camera_info *info;
> const struct ov772x_color_format *cfmt;
> const struct ov772x_win_size *win;
> @@ -550,7 +551,7 @@ static int ov772x_reset(struct i2c_client *client)
> }
>
> /*
> - * soc_camera_ops function
> + * subdev ops
> */
>
> static int ov772x_s_stream(struct v4l2_subdev *sd, int enable)
> @@ -650,13 +651,36 @@ static int ov772x_s_register(struct v4l2_subdev *sd,
> }
> #endif
>
> +static int ov772x_power_on(struct ov772x_priv *priv)
> +{
> + int ret;
> +
> + if (priv->info->platform_enable) {
> + ret = priv->info->platform_enable();
> + if (ret)
> + return ret;

What does this do, enable the regulator?

> + }
> +
> + /* drivers/sh/clk/core.c returns -EINVAL if clk is NULL */
> + return clk_enable(priv->clk) <= 0 ? 0 : 1;
> +}
> +
> +static int ov772x_power_off(struct ov772x_priv *priv)
> +{
> + if (priv->info->platform_enable)
> + priv->info->platform_disable();
> +
> + clk_disable(priv->clk);
> +
> + return 0;
> +}
> +
> static int ov772x_s_power(struct v4l2_subdev *sd, int on)
> {
> - struct i2c_client *client = v4l2_get_subdevdata(sd);
> - struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
> struct ov772x_priv *priv = to_ov772x(sd);
>
> - return soc_camera_set_power(&client->dev, ssdd, priv->clk, on);
> + return on ? ov772x_power_on(priv) :
> + ov772x_power_off(priv);
> }
>
> static const struct ov772x_win_size *ov772x_select_win(u32 width, u32 height)
> @@ -1000,14 +1024,10 @@ static int ov772x_enum_mbus_code(struct v4l2_subdev *sd,
> static int ov772x_g_mbus_config(struct v4l2_subdev *sd,
> struct v4l2_mbus_config *cfg)
> {
> - struct i2c_client *client = v4l2_get_subdevdata(sd);
> - struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
> -
> cfg->flags = V4L2_MBUS_PCLK_SAMPLE_RISING | V4L2_MBUS_MASTER |
> V4L2_MBUS_VSYNC_ACTIVE_HIGH | V4L2_MBUS_HSYNC_ACTIVE_HIGH |
> V4L2_MBUS_DATA_ACTIVE_HIGH;
> cfg->type = V4L2_MBUS_PARALLEL;
> - cfg->flags = soc_camera_apply_board_flags(ssdd, cfg);
>
> return 0;
> }
> @@ -1038,12 +1058,11 @@ static int ov772x_probe(struct i2c_client *client,
> const struct i2c_device_id *did)
> {
> struct ov772x_priv *priv;
> - struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
> - struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
> + struct i2c_adapter *adapter = client->adapter;
> int ret;
>
> - if (!ssdd || !ssdd->drv_priv) {
> - dev_err(&client->dev, "OV772X: missing platform data!\n");
> + if (!client->dev.platform_data) {
> + dev_err(&adapter->dev, "Missing OV7725 platform data\n");
> return -EINVAL;
> }
>
> @@ -1059,7 +1078,7 @@ static int ov772x_probe(struct i2c_client *client,
> if (!priv)
> return -ENOMEM;
>
> - priv->info = ssdd->drv_priv;
> + priv->info = client->dev.platform_data;
>
> v4l2_i2c_subdev_init(&priv->subdev, client, &ov772x_subdev_ops);
> v4l2_ctrl_handler_init(&priv->hdl, 3);
> @@ -1073,21 +1092,33 @@ static int ov772x_probe(struct i2c_client *client,
> if (priv->hdl.error)
> return priv->hdl.error;
>
> - priv->clk = v4l2_clk_get(&client->dev, "mclk");
> - if (IS_ERR(priv->clk)) {
> + priv->clk = clk_get(&client->dev, "mclk");
> + if (PTR_ERR(priv->clk) == -ENOENT) {
> + priv->clk = NULL;
> + } else if (IS_ERR(priv->clk)) {
> + dev_err(&client->dev, "Unable to get mclk clock\n");
> ret = PTR_ERR(priv->clk);
> - goto eclkget;
> + goto error_clk_enable;
> }
>
> ret = ov772x_video_probe(priv);
> - if (ret < 0) {
> - v4l2_clk_put(priv->clk);
> -eclkget:
> - v4l2_ctrl_handler_free(&priv->hdl);
> - } else {
> - priv->cfmt = &ov772x_cfmts[0];
> - priv->win = &ov772x_win_sizes[0];
> - }
> + if (ret < 0)
> + goto error_video_probe;
> +
> + priv->cfmt = &ov772x_cfmts[0];
> + priv->win = &ov772x_win_sizes[0];
> +
> + ret = v4l2_async_register_subdev(&priv->subdev);
> + if (ret)
> + goto error_video_probe;
> +
> + return 0;
> +
> +error_video_probe:
> + if (priv->clk)
> + clk_put(priv->clk);
> +error_clk_enable:
> + v4l2_ctrl_handler_free(&priv->hdl);
>
> return ret;
> }
> @@ -1096,7 +1127,8 @@ static int ov772x_remove(struct i2c_client *client)
> {
> struct ov772x_priv *priv = to_ov772x(i2c_get_clientdata(client));
>
> - v4l2_clk_put(priv->clk);
> + if (priv->clk)
> + clk_put(priv->clk);
> v4l2_device_unregister_subdev(&priv->subdev);
> v4l2_ctrl_handler_free(&priv->hdl);
> return 0;
> diff --git a/include/media/i2c/ov772x.h b/include/media/i2c/ov772x.h
> index 00dbb7c..5896dff 100644
> --- a/include/media/i2c/ov772x.h
> +++ b/include/media/i2c/ov772x.h
> @@ -54,6 +54,9 @@ struct ov772x_edge_ctrl {
> struct ov772x_camera_info {
> unsigned long flags;
> struct ov772x_edge_ctrl edgectrl;
> +
> + int (*platform_enable)(void);
> + void (*platform_disable)(void);
> };
>
> #endif /* __OV772X_H__ */
> --
> 2.7.4
>

--
Sakari Ailus
e-mail: sakari.ailus@iki.fi