dt-bindings: iio: adc: Add GPADC for Allwinner A523

Add support for the GPADC for the Allwinner A523. It differs from the
D1/T113s/R329/T507 by having two clocks.

Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Michal Piekos <michal.piekos@mmpsystems.pl>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

Documentation/devicetree/bindings/iio/adc/allwinner,sun20i-d1-gpadc.yaml

@@ -14,6 +14,7 @@ properties:
     oneOf:
       - enum:
           - allwinner,sun20i-d1-gpadc
+          - allwinner,sun55i-a523-gpadc
       - items:
           - enum:
               - allwinner,sun50i-h616-gpadc
@@ -29,7 +30,12 @@ properties:
     const: 0
 
   clocks:
-    maxItems: 1
+    minItems: 1
+    maxItems: 2
+
+  clock-names:
+    minItems: 1
+    maxItems: 2
 
   interrupts:
     maxItems: 1
@@ -40,6 +46,30 @@ properties:
   resets:
     maxItems: 1
 
+allOf:
+  - if:
+      properties:
+        compatible:
+          enum:
+            - allwinner,sun55i-a523-gpadc
+    then:
+      properties:
+        clocks:
+          items:
+            - description: Bus clock
+            - description: Module clock
+        clock-names:
+          items:
+            - const: bus
+            - const: mod
+      required:
+        - clock-names
+    else:
+      properties:
+        clocks:
+          maxItems: 1
+        clock-names: false
+
 patternProperties:
   "^channel@[0-9a-f]+$":
     $ref: adc.yaml