linux-kernel - Re: [PATCH v4 1/3] media: i2c: ov772x: Parse endpoint properties

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Date:   Mon, 14 Sep 2020 09:54:15 +0300
From:   Sakari Ailus <sakari.ailus@...ux.intel.com>
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Cc:     Jacopo Mondi <jacopo@...ndi.org>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org,
        Biju Das <biju.das.jz@...renesas.com>,
        Prabhakar <prabhakar.csengg@...il.com>
Subject: Re: [PATCH v4 1/3] media: i2c: ov772x: Parse endpoint properties

Hi Prabhakar,

Thanks for the patchset.

On Sun, Sep 13, 2020 at 07:42:45PM +0100, Lad Prabhakar wrote:
> Parse endpoint properties using v4l2_fwnode_endpoint_alloc_parse()
> to determine bus-type and store it locally in priv data.
> 
> Also for backward compatibility with the existing DT where bus-type
> isnt specified fallback to V4L2_MBUS_PARALLEL.
> 
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> ---
>  drivers/media/i2c/ov772x.c | 24 ++++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
> 
> diff --git a/drivers/media/i2c/ov772x.c b/drivers/media/i2c/ov772x.c
> index 2cc6a678069a..551082aa7026 100644
> --- a/drivers/media/i2c/ov772x.c
> +++ b/drivers/media/i2c/ov772x.c
> @@ -31,6 +31,7 @@
>  #include <media/v4l2-ctrls.h>
>  #include <media/v4l2-device.h>
>  #include <media/v4l2-event.h>
> +#include <media/v4l2-fwnode.h>
>  #include <media/v4l2-image-sizes.h>
>  #include <media/v4l2-subdev.h>
>  
> @@ -434,6 +435,7 @@ struct ov772x_priv {
>  #ifdef CONFIG_MEDIA_CONTROLLER
>  	struct media_pad pad;
>  #endif
> +	enum v4l2_mbus_type		  bus_type;
>  };
>  
>  /*
> @@ -1354,6 +1356,8 @@ static const struct v4l2_subdev_ops ov772x_subdev_ops = {
>  
>  static int ov772x_probe(struct i2c_client *client)
>  {
> +	struct v4l2_fwnode_endpoint bus_cfg = { .bus_type = 0 };
> +	struct fwnode_handle	*ep;
>  	struct ov772x_priv	*priv;
>  	int			ret;
>  	static const struct regmap_config ov772x_regmap_config = {
> @@ -1415,6 +1419,26 @@ static int ov772x_probe(struct i2c_client *client)
>  		goto error_clk_put;
>  	}
>  
> +	ep = fwnode_graph_get_next_endpoint(dev_fwnode(&client->dev),
> +					    NULL);
> +	if (!ep) {
> +		dev_err(&client->dev, "endpoint node not found\n");
> +		ret = -EINVAL;
> +		goto error_clk_put;
> +	}
> +
> +	bus_cfg.bus_type = V4L2_MBUS_PARALLEL;
> +	ret = v4l2_fwnode_endpoint_alloc_parse(ep, &bus_cfg);
> +	priv->bus_type = bus_cfg.bus_type;
> +	v4l2_fwnode_endpoint_free(&bus_cfg);
> +	if (ret) {
> +		/* For backward compatibility with the existing DT where
> +		 * bus-type isnt specified fallback to V4L2_MBUS_PARALLEL

"isn't", "fall back", and a period, please.

> +		 */
> +		priv->bus_type = V4L2_MBUS_PARALLEL;
> +		dev_notice(&client->dev, "Falling back to V4L2_MBUS_PARALLEL mode\n");

I'd just use dev_dbg().

> +	}
> +
>  	ret = ov772x_video_probe(priv);
>  	if (ret < 0)
>  		goto error_gpio_put;

-- 
Regards,

Sakari Ailus