From d6d7ffb994c676e6414a725d7eb8f208d901b63a Mon Sep 17 00:00:00 2001 From: Akhil R Date: Tue, 31 Mar 2026 15:52:56 +0530 Subject: [PATCH] dt-bindings: dma: nvidia,tegra186-gpc-dma: Add iommu-map property 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) Acked-by: Thierry Reding Reviewed-by: Jon Hunter Link: https://patch.msgid.link/20260331102303.33181-4-akhilrajeev@nvidia.com Signed-off-by: Vinod Koul --- .../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 64f1e9d9896d..bc093c783d98 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 properties: compatible: @@ -49,6 +50,14 @@ properties: iommus: maxItems: 1 + 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 channels or + stream IDs are not contiguous, multiple entries may be needed. + minItems: 1 + maxItems: 32 + dma-coherent: true dma-channel-mask: