linux-kernel - [PATCH v2 2/3] dt-bindings: dma: snps,dw-axi-dmac: Add iommu property

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Message-Id: <036132184140f8378f96be1b3989f834032e9d28.1760331941.git.khairul.anuar.romli@altera.com>
Date: Mon, 13 Oct 2025 13:17:37 +0800
From: Khairul Anuar Romli <khairul.anuar.romli@...era.com>
To: Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>,
	Vinod Koul <vkoul@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	dmaengine@...r.kernel.org (open list:DMA GENERIC OFFLOAD ENGINE SUBSYSTEM),
	devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS),
	linux-kernel@...r.kernel.org (open list),
	Miquel Raynal <miquel.raynal@...tlin.com>,
	Richard Weinberger <richard@....at>,
	Vignesh Raghavendra <vigneshr@...com>,
	Niravkumar L Rabara <niravkumar.l.rabara@...el.com>,
	linux-mtd@...ts.infradead.org (open list:CADENCE NAND DRIVER),
	Dinh Nguyen <dinguyen@...nel.org>,
	Khairul Anuar Romli <khairul.anuar.romli@...era.com>,
	Adrian Ng Ho Yin <adrianhoyin.ng@...era.com>
Subject: [PATCH v2 2/3] dt-bindings: dma: snps,dw-axi-dmac: Add iommu property

Agilex5 uses the snps,axi-dma-1.01a that is enumerated in snps,dw-axi-dmac for the dma-controller node.
To support IOMMU functionality, an iommus property needs to be added to the snps,dw-axi-dmac.yaml binding file.
This ensures the device tree binding correctly describes the IOMMU association for the DMA controller.

Signed-off-by: Adrian Ng Ho Yin <adrianhoyin.ng@...era.com>
Signed-off-by: Khairul Anuar Romli <khairul.anuar.romli@...era.com>
---
Changes in v2:
        - Updated the commit message to clarify the need for the changes and the hardware used o
f this changes.
---
 Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml b/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml
index 935735a59afd..a393a33c8908 100644
--- a/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml
+++ b/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml
@@ -42,6 +42,9 @@ properties:
     minItems: 1
     maxItems: 8
 
+  iommus:
+    maxItems: 1
+
   clocks:
     items:
       - description: Bus Clock
-- 
2.35.3