linux-kernel - Re: [PATCH v4 5/7] dt-bindings: display/panel: Add common rotation property

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Date:   Tue, 11 Apr 2017 08:29:43 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     Noralf Trønnes <noralf@...nnes.org>,
        devicetree@...r.kernel.org, thomas.petazzoni@...e-electrons.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 5/7] dt-bindings: display/panel: Add common rotation property

Hi Noralf,

On Saturday 11 Feb 2017 19:48:56 Noralf Trønnes wrote:
> Display panels can be oriented many ways, especially in the embedded
> world. The rotation property is a way to describe this orientation.
> The counter clockwise direction is chosen because that's what fbdev
> and drm use.
> 
> Signed-off-by: Noralf Trønnes <noralf@...nnes.org>
> Acked-by: Thierry Reding <treding@...dia.com>
> ---
> 
> Changes since version 3:
> - Changed display/display.txt -> display/panel/panel.txt
> 
>  Documentation/devicetree/bindings/display/panel/panel.txt | 4 ++++

We now have both Documentation/devicetree/bindings/display/panel/panel.txt and 
Documentation/devicetree/bindings/display/panel/panel-common.txt as they have 
been merged concurrently without being aware of each other. Would you mind if 
I moved this property to panel-common.txt ?

I would also like to document the property in a bit more details to avoid 
confusion about the rotation direction, as "display rotation" could be 
interpreted as the angle by which the display output has to be rotated to 
obtain an upside-up image. What would you think of the following, am I 
overdoing it, or is it even more confusing ?

- rotation: Panels are commonly mounted rotated, with their native orientation 
not aligned with the device's orientation. The rotation property specifies the 
angle in degrees between the panel's orientation and the device's orientation 
(corresponding to a counter-clockwise rotation of the panel). Valid values are 
0, 90, 180 and 270.


>  1 file changed, 4 insertions(+)
>  create mode 100644
> Documentation/devicetree/bindings/display/panel/panel.txt
> 
> diff --git a/Documentation/devicetree/bindings/display/panel/panel.txt
> b/Documentation/devicetree/bindings/display/panel/panel.txt new file mode
> 100644
> index 0000000..e2e6867
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/panel/panel.txt
> @@ -0,0 +1,4 @@
> +Common display properties
> +-------------------------
> +
> +- rotation:	Display rotation in degrees counter clockwise (0,90,180,270)

-- 
Regards,

Laurent Pinchart