[PATCH 3/9] dt-bindings: media: snps,dw-hdmi-rx: add the source port

[Sascha Hauer]

Describe the OF graph port connecting the receiver to an HDMI bridge in
front of it. Boards that wire the HDMI connector straight to the receiver
leave it out, so it is not required.

The schema sets additionalProperties: false, so without this a device
tree carrying the endpoint does not validate at all.

Assisted-by: Claude:claude-opus-5
Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
 Documentation/devicetree/bindings/media/snps,dw-hdmi-rx.yaml | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/devicetree/bindings/media/snps,dw-hdmi-rx.yaml b/Documentation/devicetree/bindings/media/snps,dw-hdmi-rx.yaml
index b7f6c87d0e06a..7e66dcbdfe2cb 100644
--- a/Documentation/devicetree/bindings/media/snps,dw-hdmi-rx.yaml
+++ b/Documentation/devicetree/bindings/media/snps,dw-hdmi-rx.yaml
@@ -66,6 +66,14 @@ properties:
     description: GPIO specifier for HPD.
     maxItems: 1
 
+  port:
+    $ref: /schemas/graph.yaml#/properties/port
+    description:
+      Connection to the HDMI source. Present when an HDMI bridge sits in
+      front of this receiver instead of the connector being wired straight
+      to it. The bridge is bound as a v4l2 subdevice and appears in the
+      media graph.
+
   rockchip,grf:
     $ref: /schemas/types.yaml#/definitions/phandle
     description:

-- 
2.47.3