linux-kernel - Re: [PATCH] V4L2 SDR: Add Real U8 format (V4L2_SDR_FMT

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Date:   Mon, 24 Apr 2017 16:28:38 +0200
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Bertold Van den Bergh <vandenbergh@...told.org>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] V4L2 SDR: Add Real U8 format (V4L2_SDR_FMT_RU8)

Hi Bertold,

On Mon, 2017-04-24 at 00:45 +0200, Bertold Van den Bergh wrote:
> This patch adds support for the Real U8 format to the V4L2 SDR framework.
> This will be used for a piece of hardware we are developing.
> 
> Signed-off-by: Bertold Van den Bergh <vandenbergh@...told.org>
> ---
>  drivers/media/v4l2-core/v4l2-ioctl.c | 1 +
>  include/uapi/linux/videodev2.h       | 1 +
>  2 files changed, 2 insertions(+)
> 
> diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
> index e5a2187..8b6e097 100644
> --- a/drivers/media/v4l2-core/v4l2-ioctl.c
> +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
> @@ -1229,6 +1229,7 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
>  	case V4L2_SDR_FMT_CS8:		descr = "Complex S8"; break;
>  	case V4L2_SDR_FMT_CS14LE:	descr = "Complex S14LE"; break;
>  	case V4L2_SDR_FMT_RU12LE:	descr = "Real U12LE"; break;
> +	case V4L2_SDR_FMT_RU8:		descr = "Real U8"; break;
>  	case V4L2_TCH_FMT_DELTA_TD16:	descr = "16-bit signed deltas"; break;
>  	case V4L2_TCH_FMT_DELTA_TD08:	descr = "8-bit signed deltas"; break;
>  	case V4L2_TCH_FMT_TU16:		descr = "16-bit unsigned touch data"; break;
> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> index 2b8feb8..50c3ef4 100644
> --- a/include/uapi/linux/videodev2.h
> +++ b/include/uapi/linux/videodev2.h
> @@ -669,6 +669,7 @@ struct v4l2_pix_format {
>  #define V4L2_SDR_FMT_CS8          v4l2_fourcc('C', 'S', '0', '8') /* complex s8 */
>  #define V4L2_SDR_FMT_CS14LE       v4l2_fourcc('C', 'S', '1', '4') /* complex s14le */
>  #define V4L2_SDR_FMT_RU12LE       v4l2_fourcc('R', 'U', '1', '2') /* real u12le */
> +#define V4L2_SDR_FMT_RU8          v4l2_fourcc('R', 'U', '0', '8') /* real u8 */

When adding new SDR formats, could you also add an entry to
Documentation/media/uapi/v4l/sdr-formats.rst ? See for example
Documentation/media/uapi/v4l/pixfmt-sdr-ru12le.rst.

Also maybe V4L2_SDR_FMT_RU8 should be ordered above V4L2_SDR_FMT_RU12LE?
I'm not sure from the context.

regards
Philipp