media: dt-bindings: media: rkisp1: Add port for parallel interface

The rkisp1 can take an input on the parallel interface. Add a port for
it, and update the required field. At least one port is required, and
both may be specified.
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

Documentation/devicetree/bindings/media/rockchip-isp1.yaml

@@ -84,8 +84,27 @@ properties:
                 minItems: 1
                 maxItems: 4
 
-    required:
-      - port@0
+      port@1:
+        $ref: /schemas/graph.yaml#/$defs/port-base
+        unevaluatedProperties: false
+        description: connection point for input on the parallel interface
+
+        properties:
+          bus-type:
+            enum: [5, 6]
+
+          endpoint:
+            $ref: video-interfaces.yaml#
+            unevaluatedProperties: false
+
+        required:
+          - bus-type
+
+    anyOf:
+      - required:
+          - port@0
+      - required:
+          - port@1
 
 required:
   - compatible