linux-kernel - [PATCH v2 1/4] dt-bindings: dma: snps,dw-axi-dmac: Add compatible string for Agilex5

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Message-ID: <09c56ccbd5b9cfa717c7901ac35d9235458bbc30.1764927089.git.khairul.anuar.romli@altera.com>
Date: Mon,  8 Dec 2025 09:57:42 +0800
From: Khairul Anuar Romli <khairul.anuar.romli@...era.com>
To: Dinh Nguyen <dinguyen@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>,
	Vinod Koul <vkoul@...nel.org>,
	dmaengine@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Khairul Anuar Romli <khairul.anuar.romli@...era.com>
Subject: [PATCH v2 1/4] dt-bindings: dma: snps,dw-axi-dmac: Add compatible string for Agilex5

The address bus on Agilex5 is limited to 40 bits. When SMMU is enable this
will cause address truncation and translation faults. Hence introducing
"altr,agilex5-axi-dma" to enable platform specific configuration to
configure the dma addressable bit mask.

Add a fallback capability for the compatible property to allow driver to
probe and initialize with a newly added compatible string without requiring
additional entry in the driver.

Add dma-ranges to the binding schema to allow specifying DMA address
mapping between the controller and its parent bus.

Signed-off-by: Khairul Anuar Romli <khairul.anuar.romli@...era.com>
---
Changes in v2:
	- Add dma-ranges
---
 .../bindings/dma/snps,dw-axi-dmac.yaml        | 23 +++++++++++++++----
 1 file changed, 18 insertions(+), 5 deletions(-)

diff --git a/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml b/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml
index a393a33c8908..1a1800d9b544 100644
--- a/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml
+++ b/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml
@@ -17,11 +17,15 @@ allOf:
 
 properties:
   compatible:
-    enum:
-      - snps,axi-dma-1.01a
-      - intel,kmb-axi-dma
-      - starfive,jh7110-axi-dma
-      - starfive,jh8100-axi-dma
+    oneOf:
+      - enum:
+          - snps,axi-dma-1.01a
+          - intel,kmb-axi-dma
+          - starfive,jh7110-axi-dma
+          - starfive,jh8100-axi-dma
+      - items:
+          - const: altr,agilex5-axi-dma
+          - const: snps,axi-dma-1.01a
 
   reg:
     minItems: 1
@@ -104,6 +108,15 @@ properties:
     minimum: 1
     maximum: 256
 
+  dma-ranges:
+    description: |
+      Describe memory addresses translation between the DMA address and the
+      CPU address. Each memory region, is declared with 3-6 32-bit cells
+      parameters:
+        - param 1: device base address
+        - param 2: physical base address
+        - param 3: size of the memory region.
+
 required:
   - compatible
   - reg
-- 
2.43.7