Re: [PATCH v5 2/3] dt-bindings: arm: mediatek: mmsys: Add OF graph support for board path

CK Hu (胡俊光)
2024-06-05T01:38:22Z

Hi, Angelo:

On Tue, 2024-05-21 at 09:57 +0200, AngeloGioacchino Del Regno wrote:
> Document OF graph on MMSYS/VDOSYS: this supports up to three DDP paths
> per HW instance (so potentially up to six displays for multi-vdo SoCs).
>
> The MMSYS or VDOSYS is always the first component in the DDP pipeline,
> so it only supports an output port with multiple endpoints - where each
> endpoint defines the starting point for one of the (currently three)
> possible hardware paths.
>
> Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
> Reviewed-by: Alexandre Mergnat <amergnat@baylibre.com>
> Tested-by: Alexandre Mergnat <amergnat@baylibre.com>
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
> ---
> .../bindings/arm/mediatek/mediatek,mmsys.yaml | 28 +++++++++++++++++++
> 1 file changed, 28 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys.yaml b/Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys.yaml
> index b3c6888c1457..0ef67ca4122b 100644
> --- a/Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys.yaml
> +++ b/Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys.yaml
> @@ -93,6 +93,34 @@ properties:
> '#reset-cells':
> const: 1
>
> + port:
> + $ref: /schemas/graph.yaml#/properties/port
> + description:
> + Output port node. This port connects the MMSYS/VDOSYS output to
> + the first component of one display pipeline, for example one of
> + the available OVL or RDMA blocks.
> + Some MediaTek SoCs support multiple display outputs per MMSYS.

This patch looks good to me. Just want to share another information for you.
Here is an example that mmsys/vdosys could point to the display interface node.

vdosys0: syscon@1c01a000 {
mmsys-display-interface = <&dsi0>, <&dsi1>, <&dp_intf0>;
};

vdosys1: syscon@1c100000 {
mmsys-display-interface = <&dp_intf1>;
};

There is no conflict that mmsys/vdosys point to first component of one display pipeline or point to display interface.
Both could co-exist.

Regards,
CK

> + properties:
> + endpoint@0:
> + $ref: /schemas/graph.yaml#/properties/endpoint
> + description: Output to the primary display pipeline
> +
> + endpoint@1:
> + $ref: /schemas/graph.yaml#/properties/endpoint
> + description: Output to the secondary display pipeline
> +
> + endpoint@2:
> + $ref: /schemas/graph.yaml#/properties/endpoint
> + description: Output to the tertiary display pipeline
> +
> + anyOf:
> + - required:
> + - endpoint@0
> + - required:
> + - endpoint@1
> + - required:
> + - endpoint@2
> +
> required:
> - compatible
> - reg