dt-bindings: mailbox: qcom: set correct #clock-cells

IPQ6018 and IPQ8074 require #clock-cells to be set to 1 as their APSS
clock driver provides multiple clock outputs.

So allow setting 1 as #clock-cells and check that its set to 1 for IPQ6018
and IPQ8074, check others for 0 as its currently.
Signed-off-by: Robert Marko <robimarko@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>

Documentation/devicetree/bindings/mailbox/qcom,apcs-kpss-global.yaml

@@ -54,7 +54,7 @@ properties:
     const: 1
 
   '#clock-cells':
-    const: 0
+    enum: [0, 1]
 
   clock-names:
     minItems: 2
@@ -100,6 +100,21 @@ allOf:
       properties:
         clocks:
           maxItems: 3
+  - if:
+      properties:
+        compatible:
+          enum:
+            - qcom,ipq6018-apcs-apps-global
+            - qcom,ipq8074-apcs-apps-global
+    then:
+      properties:
+        '#clock-cells':
+          const: 1
+    else:
+      properties:
+        '#clock-cells':
+          const: 0
+
 examples:
 
   # Example apcs with msm8996