[PATCH 1/3] dt-bindings: arm: mediatek: mmsys: Allow single vdo/mmsys endpoint

[AngeloGioacchino Del Regno]

The hardware supports using just a single output while leaving all
of the others unconfigured (disabled), but the binding did not
really allow specifying a single endpoint at 0, because in this case
one must either:
 - Call the subnode `endpoint` and not declare any address and/or
   size cells; or
 - Call the subnode `endpoint at 0` and have at least one more other
   endpoint(@1 or @2), and declare address/size cells.

Allow specifying a single `endpoint` subnode, without the `@0`
implicit suffix to suppress warnings happening on this kind of
valid usecase.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>
---
 .../bindings/arm/mediatek/mediatek,mmsys.yaml        | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys.yaml b/Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys.yaml
index 3f4262e93c78..e3ef7540c24f 100644
--- a/Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys.yaml
+++ b/Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys.yaml
@@ -100,11 +100,12 @@ properties:
       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 at 0:
+    patternProperties:
+      "^endpoint(@0)?$":
         $ref: /schemas/graph.yaml#/properties/endpoint
         description: Output to the primary display pipeline
 
+    properties:
       endpoint at 1:
         $ref: /schemas/graph.yaml#/properties/endpoint
         description: Output to the secondary display pipeline
@@ -114,8 +115,11 @@ properties:
         description: Output to the tertiary display pipeline
 
     anyOf:
-      - required:
-          - endpoint at 0
+      - oneOf:
+          - required:
+              - endpoint
+          - required:
+              - endpoint at 0
       - required:
           - endpoint at 1
       - required:
-- 
2.52.0