[PATCH 1/8] dt-bindings: dma: nvidia,tegra186-gpc-dma: Add iommu-map property

[Akhil R]

Add iommu-map property which helps when each channel requires its own
stream ID for the transfer. Use iommu-map to specify separate stream
ID for each channel. This enables each channel to be in its own iommu
domain and keeps the memory isolated from other devices sharing the
same DMA controller.

Signed-off-by: Akhil R <akhilrajeev@xxxxxxxxxx>
---
 .../devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml  | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml b/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml
index 0dabe9bbb219..542e9cb9f641 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 <jonathanh@xxxxxxxxxx>
   - Rajesh Gumasta <rgumasta@xxxxxxxxxx>
+  - Akhil R <akhilrajeev@xxxxxxxxxx>
 
 allOf:
   - $ref: dma-controller.yaml#
@@ -51,6 +52,13 @@ properties:
   iommus:
     maxItems: 1
 
+  iommu-map:
+    description: |
+      The mapping of DMA controller channels to IOMMU stream IDs. Each entry in the map specifies the
+      relationship between a DMA channel and its corresponding IOMMU stream ID. The format is:
+      "<ch_no &smmu stream_id length>". Example: "<1 &smmu 0x801 1>"
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+
   dma-coherent: true
 
   dma-channel-mask:
-- 
2.50.1