linux-kernel - [PATCH v2] arm64: dts: imx95: Reserve eDMA channels 0-1 for V2X

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Message-Id: <20260123-b4-imx95-v2x-v2-1-0497a9814668@nxp.com>
Date: Fri, 23 Jan 2026 18:26:27 +0800
From: Joy Zou <joy.zou@....com>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>, 
 Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>, Frank Li <Frank.Li@....com>, 
 Peng Fan <peng.fan@....com>, Ye Li <ye.li@....com>
Cc: devicetree@...r.kernel.org, imx@...ts.linux.dev, 
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Laurentiu Mihalcea <laurentiu.mihalcea@....com>, Joy Zou <joy.zou@....com>
Subject: [PATCH v2] arm64: dts: imx95: Reserve eDMA channels 0-1 for V2X

Reserve eDMA channels 0 and 1 on the AXI eDMA controller for exclusive
use by V2X (Vehicle-to-Everything) fast hash operations.

Reviewed-by: Laurentiu Mihalcea <laurentiu.mihalcea@....com>
Tested-by: Laurentiu Mihalcea <laurentiu.mihalcea@....com>
Signed-off-by: Joy Zou <joy.zou@....com>
---
Changes in v2:
- modify imx95-19x19-evk-sof.dts dma-channel-mask property.
- add comments for mask channel.
- add Reviewed-by and Tested-by tag, tested on MX95-15x15-FRDM, MX95-19x19-EVK.
- Link to v1: https://lore.kernel.org/r/20260120-b4-imx95-v2x-v1-1-52b2025b27a0@nxp.com
---
 arch/arm64/boot/dts/freescale/imx95-19x19-evk-sof.dts | 7 +++++--
 arch/arm64/boot/dts/freescale/imx95.dtsi              | 2 ++
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/freescale/imx95-19x19-evk-sof.dts b/arch/arm64/boot/dts/freescale/imx95-19x19-evk-sof.dts
index 808a9fe3ebb2b9557be9e428583e76c32517de08..264703f6eef64813d64fe07713cf92fd02fa0778 100644
--- a/arch/arm64/boot/dts/freescale/imx95-19x19-evk-sof.dts
+++ b/arch/arm64/boot/dts/freescale/imx95-19x19-evk-sof.dts
@@ -55,8 +55,11 @@ sound-wm8962 {
 };
 
 &edma2 {
-	/* channels 30 and 31 reserved for FW usage */
-	dma-channel-mask = <0xc0000000>, <0x0>;
+	/*
+	 * channels 0 and 1 reserved for V2X fast hash,
+	 * channels 30 and 31 reserved for FW usage
+	 */
+	dma-channel-mask = <0xc0000003>, <0x0>;
 };
 
 &sai3 {
diff --git a/arch/arm64/boot/dts/freescale/imx95.dtsi b/arch/arm64/boot/dts/freescale/imx95.dtsi
index 55e2da094c889fc7c1096d0e36f31ae118d2a982..9ac82da2ff440e08ae8378d7ff830a568d50a354 100644
--- a/arch/arm64/boot/dts/freescale/imx95.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx95.dtsi
@@ -631,6 +631,8 @@ edma2: dma-controller@...00000 {
 				reg = <0x42000000 0x210000>;
 				#dma-cells = <3>;
 				dma-channels = <64>;
+				/* channels 0 and 1 reserved for V2X fast hash */
+				dma-channel-mask = <0x3>;
 				interrupts = <GIC_SPI 128 IRQ_TYPE_LEVEL_HIGH>,
 					     <GIC_SPI 128 IRQ_TYPE_LEVEL_HIGH>,
 					     <GIC_SPI 129 IRQ_TYPE_LEVEL_HIGH>,

---
base-commit: d08c85ac8894995d4b0d8fb48d2f6a3e53cd79ab
change-id: 20260120-b4-imx95-v2x-3e01c7bc6881

Best regards,
-- 
Joy Zou <joy.zou@....com>