* [PATCH] arm64: dts: imx95: Reserve eDMA channels 0-1 for V2X
@ 2026-01-20 8:35 Joy Zou
2026-01-20 12:30 ` Laurentiu Mihalcea
2026-01-20 16:25 ` Frank Li
0 siblings, 2 replies; 5+ messages in thread
From: Joy Zou @ 2026-01-20 8:35 UTC (permalink / raw)
To: Rob Herring, Krzysztof Kozlowski, Conor Dooley, Shawn Guo,
Sascha Hauer, Pengutronix Kernel Team, Fabio Estevam, Frank Li,
Peng Fan, Ye Li
Cc: devicetree, imx, linux-arm-kernel, linux-kernel, Joy Zou
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@nxp.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@42000000 {
reg = <0x42000000 0x210000>;
#dma-cells = <3>;
dma-channels = <64>;
+ 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@nxp.com>
^ permalink raw reply related [flat|nested] 5+ messages in thread* Re: [PATCH] arm64: dts: imx95: Reserve eDMA channels 0-1 for V2X
2026-01-20 8:35 [PATCH] arm64: dts: imx95: Reserve eDMA channels 0-1 for V2X Joy Zou
@ 2026-01-20 12:30 ` Laurentiu Mihalcea
2026-01-21 6:27 ` Joy Zou
2026-01-20 16:25 ` Frank Li
1 sibling, 1 reply; 5+ messages in thread
From: Laurentiu Mihalcea @ 2026-01-20 12:30 UTC (permalink / raw)
To: Joy Zou, Rob Herring, Krzysztof Kozlowski, Conor Dooley,
Shawn Guo, Sascha Hauer, Pengutronix Kernel Team, Fabio Estevam,
Frank Li, Peng Fan, Ye Li
Cc: devicetree, imx, linux-arm-kernel, linux-kernel
On 1/20/2026 12:35 AM, 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@nxp.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@42000000 {
> reg = <0x42000000 0x210000>;
> #dma-cells = <3>;
> dma-channels = <64>;
> + 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,
Thanks, this fixes the kernel panics on MX95-15x15-FRDM and MX95-19x19-EVK after
AP access is removed from said channels via SM.
Just one thing: can you do this change for imx95-19x19-evk-sof.dts as well?
If not, I'll just send a patch for that later on.
Either way:
Reviewed-by: Laurentiu Mihalcea <laurentiu.mihalcea@nxp.com>
Tested-by: Laurentiu Mihalcea <laurentiu.mihalcea@nxp.com> # MX95-15x15-FRDM, MX95-19x19-EVK
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: [PATCH] arm64: dts: imx95: Reserve eDMA channels 0-1 for V2X
2026-01-20 12:30 ` Laurentiu Mihalcea
@ 2026-01-21 6:27 ` Joy Zou
0 siblings, 0 replies; 5+ messages in thread
From: Joy Zou @ 2026-01-21 6:27 UTC (permalink / raw)
To: Laurentiu Mihalcea
Cc: Rob Herring, Krzysztof Kozlowski, Conor Dooley, Shawn Guo,
Sascha Hauer, Pengutronix Kernel Team, Fabio Estevam, Frank Li,
Peng Fan, Ye Li, devicetree, imx, linux-arm-kernel, linux-kernel
On Tue, Jan 20, 2026 at 04:30:32AM -0800, Laurentiu Mihalcea wrote:
>
> On 1/20/2026 12:35 AM, 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@nxp.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@42000000 {
> > reg = <0x42000000 0x210000>;
> > #dma-cells = <3>;
> > dma-channels = <64>;
> > + 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,
>
>
> Thanks, this fixes the kernel panics on MX95-15x15-FRDM and MX95-19x19-EVK after
>
> AP access is removed from said channels via SM.
>
>
> Just one thing: can you do this change for imx95-19x19-evk-sof.dts as well?
>
> If not, I'll just send a patch for that later on.
Will change imx95-19x19-evk-sof.dts.
BR
Joy Zou
>
>
> Either way:
>
> Reviewed-by: Laurentiu Mihalcea <laurentiu.mihalcea@nxp.com>
>
> Tested-by: Laurentiu Mihalcea <laurentiu.mihalcea@nxp.com> # MX95-15x15-FRDM, MX95-19x19-EVK
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] arm64: dts: imx95: Reserve eDMA channels 0-1 for V2X
2026-01-20 8:35 [PATCH] arm64: dts: imx95: Reserve eDMA channels 0-1 for V2X Joy Zou
2026-01-20 12:30 ` Laurentiu Mihalcea
@ 2026-01-20 16:25 ` Frank Li
2026-01-21 10:31 ` Joy Zou
1 sibling, 1 reply; 5+ messages in thread
From: Frank Li @ 2026-01-20 16:25 UTC (permalink / raw)
To: Joy Zou
Cc: Rob Herring, Krzysztof Kozlowski, Conor Dooley, Shawn Guo,
Sascha Hauer, Pengutronix Kernel Team, Fabio Estevam, Peng Fan,
Ye Li, devicetree, imx, linux-arm-kernel, linux-kernel
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@nxp.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@42000000 {
> reg = <0x42000000 0x210000>;
> #dma-cells = <3>;
> dma-channels = <64>;
> + dma-channel-mask = <0x3>;
Can you add comments here? v2x needn't dt node?
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@nxp.com>
>
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: [PATCH] arm64: dts: imx95: Reserve eDMA channels 0-1 for V2X
2026-01-20 16:25 ` Frank Li
@ 2026-01-21 10:31 ` Joy Zou
0 siblings, 0 replies; 5+ messages in thread
From: Joy Zou @ 2026-01-21 10:31 UTC (permalink / raw)
To: Frank Li
Cc: Rob Herring, Krzysztof Kozlowski, Conor Dooley, Shawn Guo,
Sascha Hauer, Pengutronix Kernel Team, Fabio Estevam, Peng Fan,
Ye Li, devicetree, imx, linux-arm-kernel, linux-kernel
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@nxp.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@42000000 {
> > 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@nxp.com>
> >
^ permalink raw reply [flat|nested] 5+ messages in thread
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2026-01-20 8:35 [PATCH] arm64: dts: imx95: Reserve eDMA channels 0-1 for V2X Joy Zou
2026-01-20 12:30 ` Laurentiu Mihalcea
2026-01-21 6:27 ` Joy Zou
2026-01-20 16:25 ` Frank Li
2026-01-21 10:31 ` Joy Zou
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