dt-bindings: i2c: ti,omap4: reference i2c-controller.yaml schema

Reference the core I2C controller schema to properly define common
properties.  This allows to drop several (now redundant) properties.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>

Documentation/devicetree/bindings/i2c/ti,omap4-i2c.yaml

@@ -37,16 +37,8 @@ properties:
   clock-names:
     const: fck
 
-  clock-frequency: true
-
   power-domains: true
 
-  "#address-cells":
-    const: 1
-
-  "#size-cells":
-    const: 0
-
   ti,hwmods:
     description:
       Must be "i2c<n>", n being the instance number (1-based).
@@ -55,38 +47,34 @@ properties:
     $ref: /schemas/types.yaml#/definitions/string
     deprecated: true
 
-# subnode's properties
-patternProperties:
-  "@[0-9a-f]+$":
-    type: object
-    description:
-      Flash device uses the below defined properties in the subnode.
-
 required:
   - compatible
   - reg
   - interrupts
 
-additionalProperties: false
+allOf:
+  - $ref: /schemas/i2c/i2c-controller.yaml#
 
-if:
-  properties:
-    compatible:
-      enum:
-        - ti,omap2420-i2c
-        - ti,omap2430-i2c
-        - ti,omap3-i2c
-        - ti,omap4-i2c
+  - if:
+      properties:
+        compatible:
+          enum:
+            - ti,omap2420-i2c
+            - ti,omap2430-i2c
+            - ti,omap3-i2c
+            - ti,omap4-i2c
 
-then:
-  properties:
-    ti,hwmods:
-      items:
-        - pattern: "^i2c([1-9])$"
+    then:
+      properties:
+        ti,hwmods:
+          items:
+            - pattern: "^i2c([1-9])$"
 
-else:
-  properties:
-    ti,hwmods: false
+    else:
+      properties:
+        ti,hwmods: false
+
+unevaluatedProperties: false
 
 examples:
   - |