[PATCH v5 2/4] dt-bindings: mfd: Add MDIO interface to rtl9301-switch

[Chris Packham <chris.packham@alliedtelesis.co.nz>]

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@alliedtelesis.co.nz>
---

Notes:
    This patch is dependent on "dt-bindings: net: Add Realtek MDIO
    controller" which adds the realtek,rtl9301-mdio.yaml binding.
    
    Changes in v5:
    - Note dependency on realtek,rtl9301-mdio.yaml patch
    - Add back reg property to the mdio-controller node.
    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  | 29 +++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/Documentation/devicetree/bindings/mfd/realtek,rtl9301-switch.yaml b/Documentation/devicetree/bindings/mfd/realtek,rtl9301-switch.yaml
index f053303ab1e6..89e10213a4ee 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
 
@@ -41,6 +44,10 @@ patternProperties:
   'i2c@[0-9a-f]+$':
     $ref: /schemas/i2c/realtek,rtl9301-i2c.yaml#
 
+  'mdio-controller@[0-9a-f]+$':
+    $ref: /schemas/net/realtek,rtl9301-mdio.yaml#
+
+
 required:
   - compatible
   - reg
@@ -110,5 +117,27 @@ examples:
           };
         };
       };
+
+      mdio-controller@ca00 {
+        compatible = "realtek,rtl9301-mdio";
+        reg = <0xca00 0x200>;
+        #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>;
+          };
+        };
+      };
     };
 
-- 
2.48.1