dt-bindings: net: ipq4019-mdio: require and validate clocks

Now that we can match the platforms requiring clocks by compatible start
using those to allow clocks per compatible and make them required.

Signed-off-by: Robert Marko <robimarko@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20221114194734.3287854-3-robimarko@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Documentation/devicetree/bindings/net/qcom,ipq4019-mdio.yaml

@@ -9,9 +9,6 @@ title: Qualcomm IPQ40xx MDIO Controller
 maintainers:
   - Robert Marko <robert.marko@sartura.hr>
 
-allOf:
-  - $ref: "mdio.yaml#"
-
 properties:
   compatible:
     oneOf:
@@ -40,10 +37,8 @@ properties:
       address range is only required by the platform IPQ50xx.
 
   clocks:
-    maxItems: 1
-    description: |
-      MDIO clock source frequency fixed to 100MHZ, this clock should be specified
-      by the platform IPQ807x, IPQ60xx and IPQ50xx.
+    items:
+      - description: MDIO clock source frequency fixed to 100MHZ
 
 required:
   - compatible
@@ -51,6 +46,24 @@ required:
   - "#address-cells"
   - "#size-cells"
 
+allOf:
+  - $ref: "mdio.yaml#"
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - qcom,ipq5018-mdio
+              - qcom,ipq6018-mdio
+              - qcom,ipq8074-mdio
+    then:
+      required:
+        - clocks
+    else:
+      properties:
+        clocks: false
+
 unevaluatedProperties: false
 
 examples: