linux-kernel - [PATCH] dt-bindings: arm-smmu: disallow clocks when not used

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Message-Id: <20221222092355.74586-1-krzysztof.kozlowski@linaro.org>
Date:   Thu, 22 Dec 2022 10:23:55 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, iommu@...ts.linux.dev,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>
Subject: [PATCH] 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@...aro.org>

---

Cc: Marijn Suijten <marijn.suijten@...ainline.org>
Cc: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: Konrad Dybcio <konrad.dybcio@...aro.org>
---
 .../devicetree/bindings/iommu/arm,smmu.yaml   | 28 +++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/Documentation/devicetree/bindings/iommu/arm,smmu.yaml b/Documentation/devicetree/bindings/iommu/arm,smmu.yaml
index 895ec8418465..0d88395e43ad 100644
--- a/Documentation/devicetree/bindings/iommu/arm,smmu.yaml
+++ b/Documentation/devicetree/bindings/iommu/arm,smmu.yaml
@@ -367,6 +367,34 @@ 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:
-- 
2.34.1