linux-kernel - Re: [PATCH v3 5/7] dt-bindings: display: Add common rotation property

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Date:   Fri, 3 Feb 2017 13:16:45 +0100
From:   Noralf Trønnes <noralf@...nnes.org>
To:     Rob Herring <robh@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>
Cc:     dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        thomas.petazzoni@...e-electrons.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 5/7] dt-bindings: display: Add common rotation property

Thierry, please have a look at this.
In which direction should we rotate to match how drm rotation works?


Den 01.02.2017 18.41, skrev Rob Herring:
> On Tue, Jan 31, 2017 at 05:03:17PM +0100, 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.
> The h/w mounting is rotated counter clockwise, so the framebuffers'
> contents are rotated clockwise, right?
>
>> Signed-off-by: Noralf Trønnes <noralf@...nnes.org>
>> ---
>>   Documentation/devicetree/bindings/display/display.txt | 4 ++++
> This is panel property, so bindings/display/panel/panel.txt.
>
>>   1 file changed, 4 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/display/display.txt
>>
>> diff --git a/Documentation/devicetree/bindings/display/display.txt b/Documentation/devicetree/bindings/display/display.txt
>> new file mode 100644
>> index 0000000..e2e6867
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/display/display.txt
>> @@ -0,0 +1,4 @@
>> +Common display properties
>> +-------------------------
>> +
>> +- rotation:	Display rotation in degrees counter clockwise (0,90,180,270)
>> -- 
>> 2.10.2
>>
>> --
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