[PATCH v4 2/4] dt-bindings: mfd: Add MDIO interface to rtl9301-switch

[Chris Packham]

The MDIO controller is part of the switch on the RTL9300 family of
devices. Add a $ref to the mfd binding for these devices.

Signed-off-by: Chris Packham <chris.packham@xxxxxxxxxxxxxxxxxxx>
---

Notes:
    Changes in v4:
    - There is a single MDIO controller that has MDIO buses as children
    Changes in v3:
    - None
    Changes in v2:
    - None

 .../bindings/mfd/realtek,rtl9301-switch.yaml  | 24 +++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/Documentation/devicetree/bindings/mfd/realtek,rtl9301-switch.yaml b/Documentation/devicetree/bindings/mfd/realtek,rtl9301-switch.yaml
index f053303ab1e6..c19d2c209434 100644
--- a/Documentation/devicetree/bindings/mfd/realtek,rtl9301-switch.yaml
+++ b/Documentation/devicetree/bindings/mfd/realtek,rtl9301-switch.yaml
@@ -28,6 +28,9 @@ properties:
   reg:
     maxItems: 1
 
+  mdio-controller:
+    $ref: /schemas/net/realtek,rtl9301-mdio.yaml#
+
   '#address-cells':
     const: 1
 
@@ -110,5 +113,26 @@ examples:
           };
         };
       };
+
+      mdio-controller {
+        compatible = "realtek,rtl9301-mdio";
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        mdio-bus@0 {
+          reg = <0>;
+          #address-cells = <1>;
+          #size-cells = <0>;
+
+          ethernet-phy@0 {
+            reg = <0>;
+            realtek,port = <1>;
+          };
+          ethernet-phy@1 {
+            reg = <1>;
+            realtek,port = <0>;
+          };
+        };
+      };
     };
 
-- 
2.47.1