dt-bindings: i3c: Add mctp-controller property

This property is used to describe a I3C bus with attached MCTP I3C
target devices.

Signed-off-by: Matt Johnston <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Acked-by: Alexandre Belloni <[email protected]>
Signed-off-by: Paolo Abeni <[email protected]>

Author: mkj

Documentation/devicetree/bindings/i3c/i3c.yaml

@@ -55,6 +55,12 @@ properties:
 
       May not be supported by all controllers.
 
+  mctp-controller:
+    type: boolean
+    description: |
+      Indicates that the system is accessible via this bus as an endpoint for
+      MCTP over I3C transport.
+
 required:
   - "#address-cells"
   - "#size-cells"