linux-kernel - Re: [PATCH v2 2/3] Documentation: media: Describe V4L2_CID_UNIT_CELL

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Date:   Tue, 20 Aug 2019 17:42:49 +0200
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Ricardo Ribalda Delgado <ribalda@...nel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/3] Documentation: media: Describe
 V4L2_CID_UNIT_CELL_SIZE

On Tue, 2019-08-20 at 11:40 +0200, Ricardo Ribalda Delgado wrote:
> New control to pass to userspace the width/height of a pixel. Which is
> needed for calibration and lens selection.
> 
> Signed-off-by: Ricardo Ribalda Delgado <ribalda@...nel.org>
> ---
>  Documentation/media/uapi/v4l/ext-ctrls-camera.rst | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/Documentation/media/uapi/v4l/ext-ctrls-camera.rst b/Documentation/media/uapi/v4l/ext-ctrls-camera.rst
> index 51c1d5c9eb00..b43047d4e7a1 100644
> --- a/Documentation/media/uapi/v4l/ext-ctrls-camera.rst
> +++ b/Documentation/media/uapi/v4l/ext-ctrls-camera.rst
> @@ -510,6 +510,14 @@ enum v4l2_scene_mode -
>      value down. A value of zero stops the motion if one is in progress
>      and has no effect otherwise.
>  
> +``V4L2_CID_UNIT_CELL_SIZE (struct)``
> +    This control returns the unit cell size in nanometres. The struct provides
> +    the width and the height in separated fields to take into consideration
> +    asymmetric pixels and/or hardware binning.
> +    The unit cell consist on the whole area of the pixel, sensitive and
> +    non-sensitive.

"consists of", otherwise this looks unambiguous to me.

I'm not sure if it is required to add a table for struct v4l2_area,
similarly to the other compound controls.

> +    This control is required for automatic calibration sensors/cameras.
> +
>  .. [#f1]
>     This control may be changed to a menu control in the future, if more
>     options are required.

regards
Philipp