linux-kernel - Re: [PATCH v6 1/3] media: i2c: ov772x: Parse endpoint properties

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Message-ID: <20200930114529.GM26842@paasikivi.fi.intel.com>
Date:   Wed, 30 Sep 2020 14:45:29 +0300
From:   Sakari Ailus <sakari.ailus@...ux.intel.com>
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Cc:     Jacopo Mondi <jacopo@...ndi.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Laurent Pinchart <laurent.pinchart@...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>,
        "Lad, Prabhakar" <prabhakar.csengg@...il.com>
Subject: Re: [PATCH v6 1/3] media: i2c: ov772x: Parse endpoint properties

Hi Prabhakar,

On Thu, Sep 17, 2020 at 06:42:22PM +0100, Lad Prabhakar wrote:
> Parse endpoint properties using v4l2_fwnode_endpoint_alloc_parse()
> to determine the bus type and store it in the driver structure.
> 
> Set bus_type to V4L2_MBUS_PARALLEL as it's the only supported one
> 
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> ---
>  drivers/media/i2c/ov772x.c | 34 ++++++++++++++++++++++++++++++++++
>  1 file changed, 34 insertions(+)
> 
> diff --git a/drivers/media/i2c/ov772x.c b/drivers/media/i2c/ov772x.c
> index 2cc6a678069a..f61a3f09ad64 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;
>  };
>  
>  /*
> @@ -1348,6 +1350,34 @@ static const struct v4l2_subdev_ops ov772x_subdev_ops = {
>  	.pad	= &ov772x_subdev_pad_ops,
>  };
>  
> +static int ov772x_parse_dt(struct i2c_client *client,
> +			   struct ov772x_priv *priv)
> +{
> +	struct v4l2_fwnode_endpoint bus_cfg;
> +	struct fwnode_handle *ep;
> +	int ret;
> +
> +	ep = fwnode_graph_get_next_endpoint(dev_fwnode(&client->dev),
> +					    NULL);
> +	if (!ep) {
> +		dev_err(&client->dev, "Endpoint node not found\n");
> +		return -EINVAL;
> +	}
> +
> +	bus_cfg.bus_type = V4L2_MBUS_PARALLEL;

Please zero the entire struct, i.e. do this assignment in the declaration.

You can also use v4l2_fwnode_endpoint_parse() if you're not using the link
frequencies --- sensor drivers generally should but you could only add them
as optional at this point (out of scope of this patch).

> +	ret = v4l2_fwnode_endpoint_alloc_parse(ep, &bus_cfg);
> +	if (ret)
> +		goto error_fwnode_put;
> +
> +	priv->bus_type = bus_cfg.bus_type;
> +	v4l2_fwnode_endpoint_free(&bus_cfg);
> +
> +error_fwnode_put:
> +	fwnode_handle_put(ep);
> +
> +	return ret;
> +}
> +
>  /*
>   * i2c_driver function
>   */
> @@ -1415,6 +1445,10 @@ static int ov772x_probe(struct i2c_client *client)
>  		goto error_clk_put;
>  	}
>  
> +	ret = ov772x_parse_dt(client, priv);
> +	if (ret)
> +		goto error_clk_put;
> +
>  	ret = ov772x_video_probe(priv);
>  	if (ret < 0)
>  		goto error_gpio_put;
> -- 
> 2.17.1
> 

-- 
Sakari Ailus