Hi,

On Sat, May 19, 2018 at 08:31:16PM +0200, Jernej Skrabec wrote:
> TCON TOP main purpose is to configure whole display pipeline. It
> determines relationships between mixers and TCONs, selects source TCON
> for HDMI, muxes LCD and TV encoder GPIO output,

I'm not sure you mean GPIO here, but rather pin?

> selects TV encoder clock source and contains additional TV TCON and
> DSI gates.
> 
> Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
> ---
>  .../bindings/display/sunxi/sun4i-drm.txt      | 20 +++++++++++++++++++
>  1 file changed, 20 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt b/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt
> index 3346c1e2a7a0..a099957ab62a 100644
> --- a/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt
> +++ b/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt
> @@ -187,6 +187,26 @@ And on the A23, A31, A31s and A33, you need one more clock line:
>     - 'lvds-alt': An alternative clock source, separate from the TCON channel 0
>                   clock, that can be used to drive the LVDS clock
>  
> +TCON TOP
> +--------
> +
> +TCON TOPs main purpose is to configure whole display pipeline. It determines
> +relationships between mixers and TCONs, selects source TCON for HDMI, muxes
> +LCD and TV encoder GPIO output, selects TV encoder clock source and contains
> +additional TV TCON and DSI gates.
> +
> +Required properties:
> +  - compatible: value must be one of:
> +    * allwinner,sun8i-r40-tcon-top
> +  - reg: base address and size of the memory-mapped region.
> +  - clocks: phandle to the clocks feeding the TCON TOP
> +    * bus: TCON TOP interface clock
> +  - clock-names: clock name mentioned above
> +  - resets: phandle to the reset line driving the DRC
> +    * rst: TCON TOP reset line
> +  - reset-names: reset name mentioned above
> +  - #clock-cells : must contain 1
> +

I guess you should better describe the OF-graph endpoints, and the
clocks output. Just using the binding additions here doesn't allow to
get a clear idea of how the DT should look like.

Maxime

-- 
Maxime Ripard, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com