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

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Message-ID: <20260121103122.GB2474386@shlinux88>
Date: Wed, 21 Jan 2026 18:31:22 +0800
From: Joy Zou <joy.zou@....com>
To: Frank Li <Frank.li@....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
Subject: Re: [PATCH] arm64: dts: imx95: Reserve eDMA channels 0-1 for V2X

On Tue, Jan 20, 2026 at 11:25:42AM -0500, Frank Li wrote:
> On Tue, Jan 20, 2026 at 04:35:50PM +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.
> >
> > Signed-off-by: Joy Zou <joy.zou@....com>
> > ---
> > ---
> >  arch/arm64/boot/dts/freescale/imx95.dtsi | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/arch/arm64/boot/dts/freescale/imx95.dtsi b/arch/arm64/boot/dts/freescale/imx95.dtsi
> > index 55e2da094c889fc7c1096d0e36f31ae118d2a982..24d02aa18b2f480bbffdc30bc41c658fb3aaf67a 100644
> > --- a/arch/arm64/boot/dts/freescale/imx95.dtsi
> > +++ b/arch/arm64/boot/dts/freescale/imx95.dtsi
> > @@ -631,6 +631,7 @@ edma2: dma-controller@...00000 {
> >  				reg = <0x42000000 0x210000>;
> >  				#dma-cells = <3>;
> >  				dma-channels = <64>;
> > +				dma-channel-mask = <0x3>;
> 
> Can you add comments here? v2x needn't dt node?
Yes! V2X operates on a dedicated M-core and needn't DT node.
Just reserve the communication channel for V2X.
BR
Joy Zou
> 
> Frank
> 
> >  				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>
> >