Re: [PATCH 04/15] dt-bindings: display: sunxi-drm: Add TCON TOP description

Maxime Ripard
2018-05-21T08:01:47Z

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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-gGgVlfcn5nU@public.gmane.org>
> ---
> .../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