[PATCH v2 04/27] dt-bindings: display: sunxi-drm: Add TCON TOP description

Maxime Ripard
2018-06-13T07:34:56Z

Hi,

Thanks for working on this!

On Tue, Jun 12, 2018 at 10:00:13PM +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, 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 | 45 +++++++++++++++++++
> include/dt-bindings/clock/sun8i-tcon-top.h | 11 +++++
> 2 files changed, 56 insertions(+)
> create mode 100644 include/dt-bindings/clock/sun8i-tcon-top.h
>
> diff --git a/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt b/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt
> index 3346c1e2a7a0..ef64c589a4b3 100644
> --- a/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt
> +++ b/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt
> @@ -187,6 +187,51 @@ 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.
> +
> +It allows display pipeline to be configured in very different ways:
> +
> + / LCD0/LVDS0
> + / TCON-LCD0
> + | \ MIPI DSI
> + mixer0 |
> + \ / TCON-LCD1 - LCD1/LVDS1
> + TCON-TOP
> + / \ TCON-TV0 - TVE0/RGB
> + mixer1 | \
> + | TCON-TOP - HDMI
> + | /
> + \ TCON-TV1 - TVE1/RGB
> +
> +Note that both TCON TOP references same physical unit.
> +
> +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

s/DRC/TCON TOP/ ?

> + * rst: TCON TOP reset line

Remaining consistent with the clock name would be great

> + - reset-names: reset name mentioned above
> + - #clock-cells : must contain 1

An example would be nice here

> +- ports: A ports node with endpoint definitions as defined in
> + Documentation/devicetree/bindings/media/video-interfaces.txt. The first port
> + should be the input for mixer0 mux. The second should be the output for that
> + mux. Third port should be input for mixer1 mux. Fourth port should be output
> + for mixer1 mux. Fifth port should be input for HDMI mux. Sixth port should
> + be output for it. All output endpoints should have reg property with the id
> + of the target TCON. All ports should have only one enpoint connected to

^ endpoint

I guess it would me more readable if you were to make it a bullet
list, but this works for me otherwise.

Thanks!
Maxime

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