linux-kernel - Re: [PATCH v7 2/3] media: i2c: ov772x: Add support for BT.656 mode

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Date:   Sat, 3 Oct 2020 00:13:34 +0300
From:   Sakari Ailus <sakari.ailus@...ux.intel.com>
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Cc:     Jacopo Mondi <jacopo@...ndi.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Prabhakar <prabhakar.csengg@...il.com>,
        Biju Das <biju.das.jz@...renesas.com>
Subject: Re: [PATCH v7 2/3] media: i2c: ov772x: Add support for BT.656 mode

On Fri, Oct 02, 2020 at 05:56:55PM +0100, Lad Prabhakar wrote:
> Add support to read the bus-type for V4L2_MBUS_BT656 and enable BT.656
> mode in the sensor if needed.
> 
> For backward compatibility with older DTS where the bus-type property was
> not mandatory, assume V4L2_MBUS_PARALLEL as it was the only supported bus
> at the time. v4l2_fwnode_endpoint_alloc_parse() will not fail if
> 'bus-type' is not specified.
> 
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> Reviewed-by: Biju Das <biju.das.jz@...renesas.com>
> Reviewed-by: Jacopo Mondi <jacopo+renesas@...ndi.org>
> ---
>  drivers/media/i2c/ov772x.c | 23 +++++++++++++++++++++--
>  1 file changed, 21 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/i2c/ov772x.c b/drivers/media/i2c/ov772x.c
> index b56f8d7609e6..6b46ad493bf7 100644
> --- a/drivers/media/i2c/ov772x.c
> +++ b/drivers/media/i2c/ov772x.c
> @@ -583,6 +583,13 @@ static int ov772x_s_stream(struct v4l2_subdev *sd, int enable)
>  	if (priv->streaming == enable)
>  		goto done;
>  
> +	if (priv->bus_type == V4L2_MBUS_BT656) {
> +		ret = regmap_update_bits(priv->regmap, COM7, ITU656_ON_OFF,
> +					 enable ? ITU656_ON_OFF : ~ITU656_ON_OFF);

Here, too...

> +		if (ret)
> +			goto done;
> +	}
> +
>  	ret = regmap_update_bits(priv->regmap, COM2, SOFT_SLEEP_MODE,
>  				 enable ? 0 : SOFT_SLEEP_MODE);
>  	if (ret)
> @@ -1364,9 +1371,21 @@ static int ov772x_parse_dt(struct i2c_client *client,
>  		return -EINVAL;
>  	}
>  
> +	/*
> +	 * For backward compatibility with older DTS where the
> +	 * bus-type property was not mandatory, assume
> +	 * V4L2_MBUS_PARALLEL as it was the only supported bus at the
> +	 * time. v4l2_fwnode_endpoint_alloc_parse() will not fail if
> +	 * 'bus-type' is not specified.
> +	 */
>  	ret = v4l2_fwnode_endpoint_alloc_parse(ep, &bus_cfg);
> -	if (ret)
> -		goto error_fwnode_put;
> +	if (ret) {
> +		bus_cfg = (struct v4l2_fwnode_endpoint)
> +			  { .bus_type = V4L2_MBUS_BT656 };
> +		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);

-- 
Sakari Ailus