linux-kernel - [PATCH v2] dt-bindings: iommu: qcom

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Message-Id: <20251015-topic-qciommu_bindings_fix-v2-1-a0f3c705d0f3@oss.qualcomm.com>
Date: Wed, 15 Oct 2025 18:41:39 +0200
From: Konrad Dybcio <konradybcio@...nel.org>
To: Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>, 
 Robin Murphy <robin.murphy@....com>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Konrad Dybcio <konradybcio@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, iommu@...ts.linux.dev, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Konrad Dybcio <konrad.dybcio@...aro.org>
Subject: [PATCH v2] dt-bindings: iommu: qcom_iommu: Allow 'tbu' clock

From: Konrad Dybcio <konrad.dybcio@...aro.org>

Some IOMMUs on some platforms (there doesn't seem to be a good denominator
for this) require the presence of a third clock, specifically for
accessing the IOMMU's Translation Buffer Unit (TBU). Allow it.

Reviewed-by: Rob Herring <robh@...nel.org>
Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
---
Resending from a 2023 megaseries, no changes

v1: https://lore.kernel.org/lkml/20230627-topic-more_bindings-v1-7-6b4b6cd081e5@linaro.org/
---
 Documentation/devicetree/bindings/iommu/qcom,iommu.yaml | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/iommu/qcom,iommu.yaml b/Documentation/devicetree/bindings/iommu/qcom,iommu.yaml
index 3e5623edd207..93a489025317 100644
--- a/Documentation/devicetree/bindings/iommu/qcom,iommu.yaml
+++ b/Documentation/devicetree/bindings/iommu/qcom,iommu.yaml
@@ -32,14 +32,18 @@ properties:
           - const: qcom,msm-iommu-v2
 
   clocks:
+    minItems: 2
     items:
       - description: Clock required for IOMMU register group access
       - description: Clock required for underlying bus access
+      - description: Clock required for Translation Buffer Unit access
 
   clock-names:
+    minItems: 2
     items:
       - const: iface
       - const: bus
+      - const: tbu
 
   power-domains:
     maxItems: 1

---
base-commit: f5450b214b2440192a238d0c4af9f725810f8e01
change-id: 20251015-topic-qciommu_bindings_fix-3bf3904041b9

Best regards,
-- 
Konrad Dybcio <konrad.dybcio@....qualcomm.com>