linux-kernel - [PATCH 1/2] dt-bindings: arm-smmu: Document SM61[12]5 GPU SMMU

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Date:   Wed, 15 Mar 2023 11:52:08 +0100
From:   Konrad Dybcio <konrad.dybcio@...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>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>
Cc:     Marijn Suijten <marijn.suijten@...ainline.org>,
        linux-arm-kernel@...ts.infradead.org, iommu@...ts.linux.dev,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org,
        Konrad Dybcio <konrad.dybcio@...aro.org>
Subject: [PATCH 1/2] dt-bindings: arm-smmu: Document SM61[12]5 GPU SMMU

Both of these SoCs have a Qualcomm MMU500 implementation of SMMU
in front of their GPUs that expect 3 clocks. Both of them also have
an APPS SMMU that expects no clocks. Remove qcom,sm61[12]5-smmu-500
from the "no clocks" list (intentionally 'breaking' the schema checks
of APPS SMMU, as now it *can* accept clocks - with the current
structure of this file it would have taken a wastefully-long time to
sort this out properly..) and add necessary yaml to describe the
clocks required by the GPU SMMUs.

Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
---
 .../devicetree/bindings/iommu/arm,smmu.yaml        | 28 ++++++++++++++++++++--
 1 file changed, 26 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/iommu/arm,smmu.yaml b/Documentation/devicetree/bindings/iommu/arm,smmu.yaml
index a6224b7e5310..62c7a5ff148e 100644
--- a/Documentation/devicetree/bindings/iommu/arm,smmu.yaml
+++ b/Documentation/devicetree/bindings/iommu/arm,smmu.yaml
@@ -79,6 +79,8 @@ properties:
         items:
           - enum:
               - qcom,sc7280-smmu-500
+              - qcom,sm6115-smmu-500
+              - qcom,sm6125-smmu-500
               - qcom,sm8150-smmu-500
               - qcom,sm8250-smmu-500
               - qcom,sm8350-smmu-500
@@ -375,6 +377,30 @@ allOf:
             - description: interface clock required to access smmu's registers
                 through the TCU's programming interface.
 
+  - if:
+      properties:
+        compatible:
+          items:
+            - enum:
+                - qcom,sm6115-smmu-500
+                - qcom,sm6125-smmu-500
+            - const: qcom,adreno-smmu
+            - const: qcom,smmu-500
+            - const: arm,mmu-500
+    then:
+      properties:
+        clock-names:
+          items:
+            - const: mem
+            - const: hlos
+            - const: iface
+
+        clocks:
+          items:
+            - description: GPU memory bus clock
+            - description: Voter clock required for HLOS SMMU access
+            - description: Interface clock required for register access
+
   # Disallow clocks for all other platforms with specific compatibles
   - if:
       properties:
@@ -394,8 +420,6 @@ allOf:
               - qcom,sdm845-smmu-500
               - qcom,sdx55-smmu-500
               - qcom,sdx65-smmu-500
-              - qcom,sm6115-smmu-500
-              - qcom,sm6125-smmu-500
               - qcom,sm6350-smmu-500
               - qcom,sm6375-smmu-500
               - qcom,sm8350-smmu-500

-- 
2.39.2