| From foo@baz Mon Apr 9 17:09:24 CEST 2018 |
| From: Maxime Ripard <maxime.ripard@free-electrons.com> |
| Date: Sat, 27 May 2017 18:09:34 +0200 |
| Subject: dt-bindings: display: sun4i: Add allwinner,tcon-channel property |
| |
| From: Maxime Ripard <maxime.ripard@free-electrons.com> |
| |
| |
| [ Upstream commit 22662f12768f971809b478386d9cc4947d00497a ] |
| |
| The Allwinner Timings Controller has two, mutually exclusive, channels. |
| When the binding has been introduced, it was assumed that there would be |
| only a single user per channel in the system. |
| |
| While this is likely for the channel 0 which only connects to LCD displays, |
| it turns out that the channel 1 can be connected to multiple controllers in |
| the SoC (HDMI and TV encoders for example). And while the simultaneous use |
| of HDMI and TV outputs cannot be achieved, switching from one to the other |
| at runtime definitely sounds plausible. |
| |
| Add an extra property, allwinner,tcon-channel, to specify for a given |
| endpoint which TCON channel it is connected to, while falling back to the |
| previous mechanism if that property is missing. |
| |
| Acked-by: Chen-Yu Tsai <wens@csie.org> |
| Acked-by: Rob Herring <robh@kernel.org> |
| Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> |
| Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| --- |
| Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt | 11 ++++++---- |
| 1 file changed, 7 insertions(+), 4 deletions(-) |
| |
| --- a/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt |
| +++ b/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt |
| @@ -47,10 +47,13 @@ Required properties: |
| Documentation/devicetree/bindings/media/video-interfaces.txt. The |
| first port should be the input endpoint, the second one the output |
| |
| - The output should have two endpoints. The first is the block |
| - connected to the TCON channel 0 (usually a panel or a bridge), the |
| - second the block connected to the TCON channel 1 (usually the TV |
| - encoder) |
| + The output may have multiple endpoints. The TCON has two channels, |
| + usually with the first channel being used for the panels interfaces |
| + (RGB, LVDS, etc.), and the second being used for the outputs that |
| + require another controller (TV Encoder, HDMI, etc.). The endpoints |
| + will take an extra property, allwinner,tcon-channel, to specify the |
| + channel the endpoint is associated to. If that property is not |
| + present, the endpoint number will be used as the channel number. |
| |
| On SoCs other than the A33, there is one more clock required: |
| - 'tcon-ch1': The clock driving the TCON channel 1 |