On Fri, Jan 31, 2025 at 02:01:48PM +1300, Chris Packham wrote:

+  '#address-cells':
+    const: 1
+
+  '#size-cells':
+    const: 0
+
+  reg:
+    maxItems: 1
+
+patternProperties:
+  '^mdio-bus@[0-4]$':

4 or 5 buses?

+    $ref: mdio.yaml#
+
+    properties:
+      reg:
+        maxItems: 1
+
+    required:
+      - reg
+
+    patternProperties:
+      '^ethernet-phy@[a-f0-9]+$':
+        type: object
+        $ref: ethernet-phy.yaml#
+
+        properties:
+          realtek,port:
+            $ref: /schemas/types.yaml#/definitions/uint32
+            description:
+              The MDIO communication on the RTL9300 is abstracted by the switch. At
+              the software level communication uses the switch port to address the
+              PHY with the actual MDIO bus and address having been setup via the
+              parent mdio-bus and reg property.

maximum: 8 ?

also property should be required or you miss here default.

Best regards,
Krzysztof