linux-kernel - Re: [linux-sunxi] [PATCH v6 03/13] dt-bindings: add bindings for DE2 on V3s SoC

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Date:   Fri, 5 May 2017 11:24:26 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Icenowy Zheng <icenowy@...c.io>
Cc:     Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Rob Herring <robh+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [linux-sunxi] [PATCH v6 03/13] dt-bindings: add bindings for DE2
 on V3s SoC

On Thu, May 4, 2017 at 7:48 PM, Icenowy Zheng <icenowy@...c.io> wrote:
> Allwinner V3s SoC have a display engine which have a different pipeline
> with older SoCs.
>
> Add document for it (new compatibles and the new "mixer" part).
>
> Signed-off-by: Icenowy Zheng <icenowy@...c.io>
> Acked-by: Rob Herring <robh@...nel.org>
> ---
> Changes in v4:
> - Removed the refactor at TCON chapter.
> Changes in v3:
> - Remove the description of having a BE directly as allwinner,pipeline.
>
>  .../bindings/display/sunxi/sun4i-drm.txt           | 29 ++++++++++++++++++++--
>  1 file changed, 27 insertions(+), 2 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt b/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt
> index 7acdbf14ae1c..33452884b96e 100644
> --- a/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt
> +++ b/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt
> @@ -41,6 +41,7 @@ Required properties:
>     * allwinner,sun6i-a31-tcon
>     * allwinner,sun6i-a31s-tcon
>     * allwinner,sun8i-a33-tcon
> +   * allwinner,sun8i-v3s-tcon
>   - reg: base address and size of memory-mapped region
>   - interrupts: interrupt associated to this IP
>   - clocks: phandles to the clocks feeding the TCON. Three are needed:
> @@ -62,7 +63,7 @@ Required properties:
>    second the block connected to the TCON channel 1 (usually the TV
>    encoder)
>
> -On SoCs other than the A33, there is one more clock required:
> +On SoCs other than the A33 and V3s, there is one more clock required:
>     - 'tcon-ch1': The clock driving the TCON channel 1
>
>  DRC
> @@ -148,6 +149,26 @@ Required properties:
>    Documentation/devicetree/bindings/media/video-interfaces.txt. The
>    first port should be the input endpoints, the second one the outputs
>
> +Display Engine 2.0 Mixer
> +------------------------
> +
> +The DE2 mixer have many functionalities, currently only layer blending is
> +supported.
> +
> +Required properties:
> +  - compatible: value must be one of:
> +    * allwinner,sun8i-v3s-de2-mixer
> +  - reg: base address and size of the memory-mapped region.
> +  - clocks: phandles to the clocks feeding the frontend and backend
> +    * bus: the backend interface clock
> +    * ram: the backend DRAM clock

You probably mean "mixer" here.

> +  - clock-names: the clock names mentioned above
> +  - resets: phandles to the reset controllers driving the backend

And 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 endpoints, the second one the output
> +
>
>  Display Engine Pipeline
>  -----------------------
> @@ -162,9 +183,13 @@ Required properties:
>      * allwinner,sun6i-a31-display-engine
>      * allwinner,sun6i-a31s-display-engine
>      * allwinner,sun8i-a33-display-engine
> +    * allwinner,sun8i-v3s-display-engine
>
>    - allwinner,pipelines: list of phandle to the display engine
> -    frontends available.
> +    pipeline entry point. For SoCs with original DE (currently
> +    all SoCs supported by display engine except V3s), this
> +    phandle should be a display frontend; for SoCs with DE2,
> +    this phandle should be a mixer.

You could simplify this to "list of phandles to the display
engine frontends (DE 1.0) or mixers (DE 2.0) available".

Regards
ChenYu

>
>  Example:
>
> --
> 2.12.2
>
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