[PATCH 1/4] dt-bindings: arm-smmu: Document nvidia,memory-controller property
From: Thierry Reding <hidden>
Date: 2021-11-12 13:12:41
Also in:
linux-arm-kernel, linux-iommu, linux-tegra
Subsystem:
arm smmu drivers, iommu subsystem, open firmware and flattened device tree bindings, the rest · Maintainers:
Will Deacon, Joerg Roedel, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
From: Thierry Reding <redacted> On NVIDIA SoC's the ARM SMMU needs to interact with the memory controller in order to map memory clients to the corresponding stream IDs. Document how the nvidia,memory-controller property can be used to achieve this. Signed-off-by: Thierry Reding <redacted> --- Documentation/devicetree/bindings/iommu/arm,smmu.yaml | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/Documentation/devicetree/bindings/iommu/arm,smmu.yaml b/Documentation/devicetree/bindings/iommu/arm,smmu.yaml
index f66a3effba73..cf32a7955475 100644
--- a/Documentation/devicetree/bindings/iommu/arm,smmu.yaml
+++ b/Documentation/devicetree/bindings/iommu/arm,smmu.yaml@@ -155,6 +155,12 @@ properties: power-domains: maxItems: 1 + nvidia,memory-controller: + description: A phandle to the memory controller on NVIDIA Tegra186 + and later SoCs. The memory controller needs to be programmed with + a mapping of memory client IDs to ARM SMMU stream IDs. + $ref: /schemas/types.yaml#/definitions/phandle + required: - compatible - reg
@@ -177,6 +183,9 @@ allOf: reg: minItems: 1 maxItems: 2 + + required: + - nvidia,memory-controller else: properties: reg:
--
2.33.1