linux-kernel - Re: [RFC 1/5] media: dt-bindings: Document 'location' property

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Date:   Thu, 15 Aug 2019 01:40:28 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Jacopo Mondi <jacopo@...ndi.org>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Rob Herring <robh+dt@...nel.org>,
        "open list:MEDIA INPUT INFRASTRUCTURE (V4L/DVB)" 
        <linux-media@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        devicetree@...r.kernel.org
Subject: Re: [RFC 1/5] media: dt-bindings: Document 'location' property

Hi Jacopo,

Thank you for the patch.

On Wed, Aug 14, 2019 at 10:28:11PM +0200, Jacopo Mondi wrote:
> Add the 'location' device property, used to specify the camera device
> mounting position. The property is particularly meaningful for mobile
> devices with a well defined usage orientation.
> 
> Signed-off-by: Jacopo Mondi <jacopo@...ndi.org>
> ---
>  Documentation/devicetree/bindings/media/video-interfaces.txt | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/media/video-interfaces.txt b/Documentation/devicetree/bindings/media/video-interfaces.txt
> index f884ada0bffc..819077b2649c 100644
> --- a/Documentation/devicetree/bindings/media/video-interfaces.txt
> +++ b/Documentation/devicetree/bindings/media/video-interfaces.txt
> @@ -89,6 +89,10 @@ Optional properties
>    but a number of degrees counter clockwise. Typical values are 0 and 180
>    (upside down).
> 
> +- location: The camera device mounting position, relative to the device
> +  usage orientation. Possible values are:

I would mention "camera sensor" explicitly here, as well as clearly
stating that the property applies to camera sensors only.

> +  0 - Front camera. The image sensor is mounted on the front side of the device.
> +  1 - Back camera. The image sensor is mounted on the back side of the device.

An additional paragraph explained what "device usage orientation" means
would be useful. In particular I would give examples for phones, tablets
and laptops.

> 
>  Optional endpoint properties
>  ----------------------------

-- 
Regards,

Laurent Pinchart