linux-kernel - Re: [PATCH v2 2/8] media: i2c: ds90ub953: Use v4l2_fwnode_endpoint

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Message-ID: <20230725163039.GI31069@pendragon.ideasonboard.com>
Date:   Tue, 25 Jul 2023 19:30:39 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Luca Ceresoli <luca.ceresoli@...tlin.com>,
        Andy Shevchenko <andriy.shevchenko@...el.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Hans Verkuil <hverkuil@...all.nl>,
        Satish Nagireddy <satish.nagireddy@...cruise.com>,
        Matti Vaittinen <mazziesaccount@...il.com>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/8] media: i2c: ds90ub953: Use
 v4l2_fwnode_endpoint_parse()

Hi Tomi,

Thank you for the patch.

On Thu, Jul 20, 2023 at 01:30:33PM +0300, Tomi Valkeinen wrote:
> Use v4l2_fwnode_endpoint_parse() to parse the sink endpoint parameters.
> 
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
> ---
>  drivers/media/i2c/ds90ub953.c | 18 ++++++++++++------
>  1 file changed, 12 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/media/i2c/ds90ub953.c b/drivers/media/i2c/ds90ub953.c
> index 591b52bf71c2..ad964bd6c7eb 100644
> --- a/drivers/media/i2c/ds90ub953.c
> +++ b/drivers/media/i2c/ds90ub953.c
> @@ -25,6 +25,8 @@
>  #include <media/i2c/ds90ub9xx.h>
>  #include <media/v4l2-ctrls.h>
>  #include <media/v4l2-event.h>
> +#include <media/v4l2-fwnode.h>
> +#include <media/v4l2-mediabus.h>
>  #include <media/v4l2-subdev.h>
>  
>  #define UB953_PAD_SINK			0
> @@ -1111,7 +1113,9 @@ static const struct regmap_config ub953_regmap_config = {
>  static int ub953_parse_dt(struct ub953_data *priv)
>  {
>  	struct device *dev = &priv->client->dev;
> +	struct v4l2_fwnode_endpoint vep = {};
>  	struct fwnode_handle *ep_fwnode;
> +	unsigned char nlanes;
>  	int ret;
>  
>  	ep_fwnode = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev),
> @@ -1119,19 +1123,21 @@ static int ub953_parse_dt(struct ub953_data *priv)
>  	if (!ep_fwnode)
>  		return dev_err_probe(dev, -ENOENT, "no endpoint found\n");
>  
> -	ret = fwnode_property_count_u32(ep_fwnode, "data-lanes");
> +	vep.bus_type = V4L2_MBUS_CSI2_DPHY;

I would initialize .bus_type when declaring the variable.

> +	ret = v4l2_fwnode_endpoint_parse(ep_fwnode, &vep);
>  
>  	fwnode_handle_put(ep_fwnode);
>  
> -	if (ret < 0)
> +	if (ret)
>  		return dev_err_probe(dev, ret,
> -				     "failed to parse property 'data-lanes'\n");
> +				     "failed to parse sink endpoint data\n");
>  
> -	if (ret != 1 && ret != 2 && ret != 4)
> +	nlanes = vep.bus.mipi_csi2.num_data_lanes;
> +	if (nlanes != 1 && nlanes != 2 && nlanes != 4)
>  		return dev_err_probe(dev, -EINVAL,
> -				     "bad number of data-lanes: %d\n", ret);
> +				     "bad number of data-lanes: %d\n", nlanes);

%u as nlanes is now unsigned.

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

>  
> -	priv->num_data_lanes = ret;
> +	priv->num_data_lanes = nlanes;
>  
>  	return 0;
>  }
> 

-- 
Regards,

Laurent Pinchart