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

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Message-ID: <20240521075717.50330-3-angelogioacchino.delregno@collabora.com>
Date: Tue, 21 May 2024 09:57:16 +0200
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: chunkuang.hu@...nel.org
Cc: robh@...nel.org,
	krzysztof.kozlowski+dt@...aro.org,
	conor+dt@...nel.org,
	p.zabel@...gutronix.de,
	airlied@...il.com,
	daniel@...ll.ch,
	maarten.lankhorst@...ux.intel.com,
	mripard@...nel.org,
	tzimmermann@...e.de,
	matthias.bgg@...il.com,
	angelogioacchino.delregno@...labora.com,
	shawn.sung@...iatek.com,
	yu-chang.lee@...iatek.com,
	ck.hu@...iatek.com,
	jitao.shi@...iatek.com,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	linux-mediatek@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	wenst@...omium.org,
	kernel@...labora.com,
	Alexandre Mergnat <amergnat@...libre.com>
Subject: [PATCH v5 2/3] dt-bindings: arm: mediatek: mmsys: Add OF graph support for board path

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@...nel.org>
Reviewed-by: Alexandre Mergnat <amergnat@...libre.com>
Tested-by: Alexandre Mergnat <amergnat@...libre.com>
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.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.
+    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
-- 
2.45.1