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

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Message-ID: <aXOLrst3ZEJB6FZk@lizhi-Precision-Tower-5810>
Date: Fri, 23 Jan 2026 09:54:38 -0500
From: Frank Li <Frank.li@....com>
To: Joy Zou <joy.zou@....com>
Cc: 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>, Peng Fan <peng.fan@....com>,
	Ye Li <ye.li@....com>, devicetree@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Laurentiu Mihalcea <laurentiu.mihalcea@....com>
Subject: Re: [PATCH v2] arm64: dts: imx95: Reserve eDMA channels 0-1 for V2X

On Fri, Jan 23, 2026 at 06:26:27PM +0800, Joy Zou wrote:
> 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 ++

common dtsi and board dts use two patch.

>  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>;

Need add to commit message.

Frank
>  };
>
>  &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>
>