On Fri, Jan 25, 2019 at 01:28:50AM +0530, Jagan Teki wrote:
> Most of the Allwinner MIPI DSI controllers are supply with
> VCC-DSI pin. which need to supply for some of the boards to
> trigger the power.
> 
> So, document the supply property so-that the required board
> can eable it via device tree.
> 
> Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
> Reviewed-by: Rob Herring <robh@kernel.org>
> ---
>  Documentation/devicetree/bindings/display/sunxi/sun6i-dsi.txt | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/display/sunxi/sun6i-dsi.txt b/Documentation/devicetree/bindings/display/sunxi/sun6i-dsi.txt
> index 6a6cf5de08b0..69e233e8fad1 100644
> --- a/Documentation/devicetree/bindings/display/sunxi/sun6i-dsi.txt
> +++ b/Documentation/devicetree/bindings/display/sunxi/sun6i-dsi.txt
> @@ -27,6 +27,9 @@ Required properties:
>      first port should be the input endpoint, usually coming from the
>      associated TCON.
>  
> +Optional properties:
> +  - vcc-dsi-supply: the VCC-DSI power supply of the DSI encoder
> +

It looks like the VCC power rail is found on all the Allwinner SoCs,
so it should be made mandatory.

Maxime

-- 
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com