linux-kernel - Re: [PATCH v2 3/8] media: i2c: ds90ub913: Use v4l2_fwnode_endpoint

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Message-ID: <20230725163410.GJ31069@pendragon.ideasonboard.com>
Date:   Tue, 25 Jul 2023 19:34:10 +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 3/8] media: i2c: ds90ub913: Use
 v4l2_fwnode_endpoint_parse()

Hi Tomi,

Thank you for the patch.

On Thu, Jul 20, 2023 at 01:30:34PM +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/ds90ub913.c | 32 ++++++++++++++++++++------------
>  1 file changed, 20 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/media/i2c/ds90ub913.c b/drivers/media/i2c/ds90ub913.c
> index 4dae5afa9fa9..cb53b0654a43 100644
> --- a/drivers/media/i2c/ds90ub913.c
> +++ b/drivers/media/i2c/ds90ub913.c
> @@ -21,6 +21,8 @@
>  #include <linux/regmap.h>
>  
>  #include <media/i2c/ds90ub9xx.h>
> +#include <media/v4l2-fwnode.h>
> +#include <media/v4l2-mediabus.h>
>  #include <media/v4l2-subdev.h>
>  
>  #define UB913_PAD_SINK			0
> @@ -83,7 +85,7 @@ struct ub913_data {
>  
>  	struct ds90ub9xx_platform_data *plat_data;
>  
> -	u32			pclk_polarity;
> +	u32			pclk_polarity_rising;

bool ?

>  };
>  
>  static inline struct ub913_data *sd_to_ub913(struct v4l2_subdev *sd)
> @@ -675,25 +677,31 @@ static int ub913_add_i2c_adapter(struct ub913_data *priv)
>  static int ub913_parse_dt(struct ub913_data *priv)
>  {
>  	struct device *dev = &priv->client->dev;
> +	struct v4l2_fwnode_endpoint vep = {};
>  	struct fwnode_handle *ep_fwnode;
>  	int ret;
>  
>  	ep_fwnode = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev),
>  						    UB913_PAD_SINK, 0, 0);
> -	if (!ep_fwnode) {
> -		dev_err_probe(dev, -ENOENT, "No sink endpoint\n");
> -		return -ENOENT;
> -	}
> +	if (!ep_fwnode)
> +		return dev_err_probe(dev, -ENOENT, "No sink endpoint\n");
>  
> -	ret = fwnode_property_read_u32(ep_fwnode, "pclk-sample",
> -				       &priv->pclk_polarity);
> +	vep.bus_type = V4L2_MBUS_PARALLEL;

I'd initialize this when declaring the variable.

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

> +	ret = v4l2_fwnode_endpoint_parse(ep_fwnode, &vep);
>  
>  	fwnode_handle_put(ep_fwnode);
>  
> -	if (ret) {
> -		dev_err_probe(dev, ret, "failed to parse 'pclk-sample'\n");
> -		return ret;
> -	}
> +	if (ret)
> +		return dev_err_probe(dev, ret,
> +				     "failed to parse sink endpoint data\n");
> +
> +	if (vep.bus.parallel.flags & V4L2_MBUS_PCLK_SAMPLE_RISING)
> +		priv->pclk_polarity_rising = true;
> +	else if (vep.bus.parallel.flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
> +		priv->pclk_polarity_rising = false;
> +	else
> +		return dev_err_probe(dev, -EINVAL,
> +				     "bad value for 'pclk-sample'\n");
>  
>  	return 0;
>  }
> @@ -726,7 +734,7 @@ static int ub913_hw_init(struct ub913_data *priv)
>  
>  	ub913_read(priv, UB913_REG_GENERAL_CFG, &v);
>  	v &= ~UB913_REG_GENERAL_CFG_PCLK_RISING;
> -	v |= priv->pclk_polarity ? UB913_REG_GENERAL_CFG_PCLK_RISING : 0;
> +	v |= priv->pclk_polarity_rising ? UB913_REG_GENERAL_CFG_PCLK_RISING : 0;
>  	ub913_write(priv, UB913_REG_GENERAL_CFG, v);
>  
>  	return 0;
> 

-- 
Regards,

Laurent Pinchart