dt-bindings: lcdif: Add endpoint bus-width property

The DPI output of the LCD interface can be configured with a bus width
of 16, 18, or 24 bits. Introduce a bus-width property to the output
endpoint, specifying the number of parallel RGB bits connected.

Reviewed-by: Frank Li <Frank.Li@nxp.com>
Acked-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Link: https://patch.msgid.link/20260917140042.118181-2-francesco@dolcini.it
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>

Documentation/devicetree/bindings/display/fsl,lcdif.yaml

@@ -68,9 +68,19 @@ properties:
     maxItems: 1
 
   port:
-    $ref: /schemas/graph.yaml#/properties/port
+    $ref: /schemas/graph.yaml#/$defs/port-base
+    unevaluatedProperties: false
     description: The LCDIF output port
 
+    properties:
+      endpoint:
+        $ref: /schemas/media/video-interfaces.yaml
+        unevaluatedProperties: false
+
+        properties:
+          bus-width:
+            enum: [ 16, 18, 24 ]
+
   display:
     $ref: /schemas/types.yaml#/definitions/phandle
     description: phandle to display panel