[PATCH v3 2/9] dt-bindings: arm-smmu: Add Tegra186 compatible string
From: Thierry Reding <hidden>
Date: 2021-06-03 16:51:05
Also in:
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> The ARM SMMU instantiations found on Tegra186 and later need inter- operation with the memory controller in order to correctly program stream ID overrides. Furthermore, on Tegra194 multiple instances of the SMMU can gang up to achieve higher throughput. In order to do this, they have to be programmed identically so that the memory controller can interleave memory accesses between them. Add the Tegra186 compatible string to make sure the interoperation with the memory controller can be enabled on that SoC generation. Signed-off-by: Thierry Reding <redacted> --- Documentation/devicetree/bindings/iommu/arm,smmu.yaml | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/Documentation/devicetree/bindings/iommu/arm,smmu.yaml b/Documentation/devicetree/bindings/iommu/arm,smmu.yaml
index 9d27aa5111d4..1181b590db71 100644
--- a/Documentation/devicetree/bindings/iommu/arm,smmu.yaml
+++ b/Documentation/devicetree/bindings/iommu/arm,smmu.yaml@@ -54,8 +54,14 @@ properties: - const: arm,mmu-500 - description: NVIDIA SoCs that program two ARM MMU-500s identically items: + - description: NVIDIA SoCs that require memory controller interaction + and may program multiple ARM MMU-500s identically with the memory + controller interleaving translations between multiple instances + for improved performance. + items: - enum: - - nvidia,tegra194-smmu + - const: nvidia,tegra194-smmu + - const: nvidia,tegra186-smmu - const: nvidia,smmu-500 - items: - const: arm,mmu-500
@@ -165,10 +171,11 @@ allOf: contains: enum: - nvidia,tegra194-smmu + - nvidia,tegra186-smmu then: properties: reg: - minItems: 2 + minItems: 1 maxItems: 2 else: properties:
--
2.31.1
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