media: dt-bindings: mipi-ccs: Add bus-type for C-PHY support

The bus-type property is required for C-PHY support. Add it, including
values for CCP2 and CSI-2 D-PHY.

Also require the bus-type property. Effectively all new sensors are MIPI
D-PHY or C-PHY that cannot be told apart without the bus-type property.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

Documentation/devicetree/bindings/media/i2c/mipi-ccs.yaml

@@ -77,9 +77,17 @@ properties:
           data-lanes:
             minItems: 1
             maxItems: 8
+          bus-type:
+            description: The type of the data bus.
+            oneOf:
+              - const: 1 # CSI-2 C-PHY
+              - const: 3 # CCP2
+              - const: 4 # CSI-2 D-PHY
+
         required:
           - link-frequencies
           - data-lanes
+          - bus-type
 
 required:
   - compatible
@@ -112,6 +120,7 @@ examples:
                     remote-endpoint = <&csi2a_ep>;
                     link-frequencies = /bits/ 64 <199200000 210000000
                                                   499200000>;
+                    bus-type = <4>;
                 };
             };
         };