linux-kernel - [PATCH] dt-bindings: dma: snps,dw-axi-dmac: Allow devices to be marked as noncoherent

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Message-ID: <20250303065649.937233-1-inochiama@gmail.com>
Date: Mon,  3 Mar 2025 14:56:48 +0800
From: Inochi Amaoto <inochiama@...il.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>
Cc: Inochi Amaoto <inochiama@...il.com>,
	dmaengine@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Yixun Lan <dlan@...too.org>,
	Longbin Li <looong.bin@...il.com>
Subject: [PATCH] dt-bindings: dma: snps,dw-axi-dmac: Allow devices to be marked as noncoherent

A RISC-V platform can have both DMA coherent/noncoherent devices.
Since the RISC-V architecture is marked coherent, devices should
be marked as noncoherent when coherent devices exist.

Add dma-noncoherent property for snps,dw-axi-dmac device. It will
be used on SG2044, and it has other coherent devices.

Signed-off-by: Inochi Amaoto <inochiama@...il.com>
---
Related discussion for this property.

https://lore.kernel.org/all/20250221013758.370936-1-inochiama@gmail.com/
---
 Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml b/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml
index 525f5f3932f5..935735a59afd 100644
--- a/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml
+++ b/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml
@@ -59,6 +59,8 @@ properties:
     minimum: 1
     maximum: 8

+  dma-noncoherent: true
+
   resets:
     minItems: 1
     maxItems: 2
--
2.48.1