dt-bindings: arm-smmu: disallow clocks when not used

Disallow clocks for variants other than:
1. SMMUs with platform-specific compatibles which list explicit clocks
   and clock-names,
2. SMMUs using only generic compatibles, e.g. arm,mmu-500, which have a
   variable clocks on different implementations.

This requires such variants with platform-specific compatible, to
explicitly list the clocks or omit them, making the binding more
constraint.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20221222092355.74586-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Will Deacon <will@kernel.org>

Documentation/devicetree/bindings/iommu/arm,smmu.yaml

@@ -368,6 +368,34 @@ allOf:
             - description: interface clock required to access smmu's registers
                 through the TCU's programming interface.
 
+  # Disallow clocks for all other platforms with specific compatibles
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - cavium,smmu-v2
+              - marvell,ap806-smmu-500
+              - nvidia,smmu-500
+              - qcom,qcm2290-smmu-500
+              - qcom,qdu1000-smmu-500
+              - qcom,sc7180-smmu-500
+              - qcom,sc8180x-smmu-500
+              - qcom,sc8280xp-smmu-500
+              - qcom,sdm670-smmu-500
+              - qcom,sdm845-smmu-500
+              - qcom,sdx55-smmu-500
+              - qcom,sdx65-smmu-500
+              - qcom,sm6115-smmu-500
+              - qcom,sm6350-smmu-500
+              - qcom,sm6375-smmu-500
+              - qcom,sm8350-smmu-500
+              - qcom,sm8450-smmu-500
+    then:
+      properties:
+        clock-names: false
+        clocks: false
+
   - if:
       properties:
         compatible: