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

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Date:   Wed, 12 Apr 2017 13:01:21 +0200
From:   Noralf Trønnes <noralf@...nnes.org>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        dri-devel@...ts.freedesktop.org
Cc:     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


Den 11.04.2017 07.29, skrev Laurent Pinchart:
> 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 ?

Not at all, please do.

> 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 ?

I was more confused at least :-)
It's not important to me what the actual wording is, but I see that I
have used the word 'Display' which should have been 'Panel'.

Noralf.

> - 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)