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charset="utf-8" Add iommu-map property to specify separate stream IDs for each DMA channel. This enables each channel to be in its own IOMMU domain, keeping memory isolated from other devices sharing the same DMA controller. Define the constraints such that if the channel and stream IDs are contiguous, a single entry can map all the channels, but if the channels or stream IDs are non-contiguous support multiple entries. Signed-off-by: Akhil R Acked-by: Rob Herring (Arm) --- .../devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.= yaml b/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml index 9f9f1a30e139..b849d4cc2901 100644 --- a/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml +++ b/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml @@ -14,6 +14,7 @@ description: | maintainers: - Jon Hunter - Rajesh Gumasta + - Akhil R =20 properties: compatible: @@ -49,6 +50,14 @@ properties: iommus: maxItems: 1 =20 + iommu-map: + description: + Maps DMA channel numbers to IOMMU stream IDs. A single entry can map= all + channels when stream IDs are contiguous. In systems where the channe= ls or + stream IDs are not contiguous, multiple entries may be needed. + minItems: 1 + maxItems: 32 + dma-coherent: true =20 dma-channel-mask: --=20 2.50.1