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

[Sakari Ailus]

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@xxxxxxxxxx>
> ---
>  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@xxxxxx