* [PATCH] arm64: dts: st: fix arm,smc-id of the SMC watchdog on stm32mp2
@ 2026-09-07 9:14 Mateusz Nowicki
2026-09-08 8:52 ` [Linux-stm32] [PATCH] arm64: dts: st: fix arm, smc-id " Antonio Borneo
0 siblings, 1 reply; 2+ messages in thread
From: Mateusz Nowicki @ 2026-09-07 9:14 UTC (permalink / raw)
To: alexandre.torgue, mcoquelin.stm32
Cc: robh, krzk+dt, conor+dt, lionel.debieve, amelie.delaunay,
patrice.chotard, devicetree, linux-stm32, linux-arm-kernel,
linux-kernel
OP-TEE implements the STM32MP2 watchdog SMC service with function ID
0xbc000000 (CFG_WDT_SM_HANDLER_ID), not 0xb200005a. With the current
value the arm_smc_wdt probe fails with -EIO and the IWDG started by the
bootloader is never refreshed.
Fixes: 89fca38168c9 ("arm64: dts: st: add arm-wdt node for watchdog support on stm32mp251")
Fixes: e9b03ef21386 ("arm64: dts: st: introduce stm32mp23 SoCs family")
Signed-off-by: Mateusz Nowicki <mateusz.nowicki@posteo.net>
---
arch/arm64/boot/dts/st/stm32mp231.dtsi | 2 +-
arch/arm64/boot/dts/st/stm32mp251.dtsi | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/boot/dts/st/stm32mp231.dtsi b/arch/arm64/boot/dts/st/stm32mp231.dtsi
index 9e1d240888ff..35e247af957c 100644
--- a/arch/arm64/boot/dts/st/stm32mp231.dtsi
+++ b/arch/arm64/boot/dts/st/stm32mp231.dtsi
@@ -35,7 +35,7 @@ arm-pmu {
arm_wdt: watchdog {
compatible = "arm,smc-wdt";
- arm,smc-id = <0xb200005a>;
+ arm,smc-id = <0xbc000000>;
status = "disabled";
};
diff --git a/arch/arm64/boot/dts/st/stm32mp251.dtsi b/arch/arm64/boot/dts/st/stm32mp251.dtsi
index 9c63fdb5a885..2dcbba65e298 100644
--- a/arch/arm64/boot/dts/st/stm32mp251.dtsi
+++ b/arch/arm64/boot/dts/st/stm32mp251.dtsi
@@ -36,7 +36,7 @@ arm-pmu {
arm_wdt: watchdog {
compatible = "arm,smc-wdt";
- arm,smc-id = <0xb200005a>;
+ arm,smc-id = <0xbc000000>;
status = "disabled";
};
--
2.55.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [Linux-stm32] [PATCH] arm64: dts: st: fix arm, smc-id of the SMC watchdog on stm32mp2
2026-09-07 9:14 [PATCH] arm64: dts: st: fix arm,smc-id of the SMC watchdog on stm32mp2 Mateusz Nowicki
@ 2026-09-08 8:52 ` Antonio Borneo
0 siblings, 0 replies; 2+ messages in thread
From: Antonio Borneo @ 2026-09-08 8:52 UTC (permalink / raw)
To: Mateusz Nowicki, alexandre.torgue, mcoquelin.stm32
Cc: robh, conor+dt, devicetree, linux-stm32, linux-kernel, krzk+dt,
linux-arm-kernel
On Mon, 2026-09-07 at 09:14 +0000, Mateusz Nowicki wrote:
> OP-TEE implements the STM32MP2 watchdog SMC service with function ID
> 0xbc000000 (CFG_WDT_SM_HANDLER_ID), not 0xb200005a. With the current
> value the arm_smc_wdt probe fails with -EIO and the IWDG started by the
> bootloader is never refreshed.
>
> Fixes: 89fca38168c9 ("arm64: dts: st: add arm-wdt node for watchdog support on stm32mp251")
> Fixes: e9b03ef21386 ("arm64: dts: st: introduce stm32mp23 SoCs family")
> Signed-off-by: Mateusz Nowicki <mateusz.nowicki@posteo.net>
Reviewed-by: Antonio Borneo <antonio.borneo@foss.st.com>
Thanks,
Antonio
^ permalink raw reply [flat|nested] 2+ messages in thread
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2026-09-07 9:14 [PATCH] arm64: dts: st: fix arm,smc-id of the SMC watchdog on stm32mp2 Mateusz Nowicki
2026-09-08 8:52 ` [Linux-stm32] [PATCH] arm64: dts: st: fix arm, smc-id " Antonio Borneo
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