dt-bindings: display: bridge: sil,sii9022: Add bus-width

The SI9022 HDMI transmitter can be configured with a bus-width of 16,
18, or 24 bits. Introduce a bus-width property to the input endpoint,
specifying the number of parallel RGB input bits connected to the
transmitter.

Signed-off-by: Wadim Egorov <w.egorov@phytec.de>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20241017085556.3045686-2-w.egorov@phytec.de
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20241017085556.3045686-2-w.egorov@phytec.de

Documentation/devicetree/bindings/display/bridge/sil,sii9022.yaml

@@ -81,9 +81,22 @@ properties:
 
     properties:
       port@0:
-        $ref: /schemas/graph.yaml#/properties/port
+        unevaluatedProperties: false
+        $ref: /schemas/graph.yaml#/$defs/port-base
         description: Parallel RGB input port
 
+        properties:
+          endpoint:
+            $ref: /schemas/graph.yaml#/$defs/endpoint-base
+            unevaluatedProperties: false
+
+            properties:
+              bus-width:
+                description:
+                  Endpoint bus width.
+                enum: [ 16, 18, 24 ]
+                default: 24
+
       port@1:
         $ref: /schemas/graph.yaml#/properties/port
         description: HDMI output port