linux-kernel - Re: [PATCH v3 3/7] Documentation: media: Document V4L2_CTRL_TYPE

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Date:   Thu, 12 Sep 2019 13:00:36 +0200
From:   Hans Verkuil <hverkuil-cisco@...all.nl>
To:     Ricardo Ribalda Delgado <ribalda@...nel.org>,
        Jacopo Mondi <jacopo@...ndi.org>
Cc:     Philipp Zabel <p.zabel@...gutronix.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        linux-media <linux-media@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 3/7] Documentation: media: Document V4L2_CTRL_TYPE_AREA

On 9/12/19 12:51 PM, Ricardo Ribalda Delgado wrote:
> HI Jacopo
> 
> (Sorry for the late reply, I have been in holidays plus with plenty of
> family matters)
> 
> On Mon, Aug 26, 2019 at 9:39 AM Jacopo Mondi <jacopo@...ndi.org> wrote:
>>
>> Hi Ricardo,
>>
>> On Fri, Aug 23, 2019 at 02:37:33PM +0200, Ricardo Ribalda Delgado wrote:
>>> A struct v4l2_area containing the width and the height of a rectangular
>>> area.
>>>
>>> Signed-off-by: Ricardo Ribalda Delgado <ribalda@...nel.org>
>>> Suggested-by: Hans Verkuil <hverkuil-cisco@...all.nl>
>>> ---
>>>  Documentation/media/uapi/v4l/vidioc-queryctrl.rst | 6 ++++++
>>>  1 file changed, 6 insertions(+)
>>>
>>> diff --git a/Documentation/media/uapi/v4l/vidioc-queryctrl.rst b/Documentation/media/uapi/v4l/vidioc-queryctrl.rst
>>> index a3d56ffbf4cc..c09d06ef2b08 100644
>>> --- a/Documentation/media/uapi/v4l/vidioc-queryctrl.rst
>>> +++ b/Documentation/media/uapi/v4l/vidioc-queryctrl.rst
>>> @@ -443,6 +443,12 @@ See also the examples in :ref:`control`.
>>>        - n/a
>>>        - A struct :c:type:`v4l2_ctrl_mpeg2_quantization`, containing MPEG-2
>>>       quantization matrices for stateless video decoders.
>>> +    * - ``V4L2_CTRL_TYPE_AREA``
>>> +      - n/a
>>
>> Can an area be negative ?
>> I would set these fields to ">= 0" ">= 1" and ">= 0" respectively.
>>
> 
> Dont min, max and step only make sense for integer controls?

It's up to us to define this :-)

I think it would make sense here as well where the range applies to both
width and height values. Obviously, the range will be a superset of the
range of each field separately, but it does help validation and prevent
negative values.

Regards,

	Hans

> 
>> Thanks
>>    j
>>
>>> +      - n/a
>>> +      - n/a
>>> +      - A struct :c:type:`v4l2_area`, containing the width and the height
>>> +        of a rectangular area.
>>>      * - ``V4L2_CTRL_TYPE_H264_SPS``
>>>        - n/a
>>>        - n/a
>>> --
>>> 2.23.0.rc1
>>>