On Fri, Feb 03, 2017 at 01:16:45PM +0100, Noralf Trønnes wrote:
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?
Given that this describes the rotation of the panel, I think it should be described in terms of how the panel is rotated, not how the framebuffer needs to be rotated. Using counter-clockwise, as described in this binding seems fine to me.
It would have to be up to fbdev and DRM/KMS to transform that into a clockwise rotation for the framebuffer, CRTC, plane, ...
Ideally with some sort of helper.
Thierry
Signed-off-by: Noralf Trønnes noralf@tronnes.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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