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ARM: dts: stm32: Add arm,no-tick-in-suspend to STM32MP15xx STGEN timer

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STM32MP15xx RM0436 Rev 6 section 46.3 System timer generator (STGEN) states
"
Arm recommends that the system counter is in an always-on power domain.
This is not supported in the current implementation, therefore STGEN should
be saved and restored before Standby mode entry, and restored at Standby
exit by secure software.
...
"
Instead of piling up workarounds in the firmware which is difficult to
update, add "arm,no-tick-in-suspend" DT property into the timer node to
indicate the timer is stopped in suspend, and let the kernel fix the
timer up.

Fixes: 8471a20253 ("ARM: dts: stm32: add stm32mp157c initial support")
Signed-off-by: Marek Vasut <marex@denx.de>
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>
This commit is contained in:
Marek Vasut 2024-05-13 23:58:15 +02:00 committed by Alexandre Torgue
parent 3d058df954
commit 4306c04741
1 changed files with 1 additions and 0 deletions
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arch/arm/boot/dts/st/stm32mp151.dtsi
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@ -50,6 +50,7 @@
<GIC_PPI 11 (GIC_CPU_MASK_SIMPLE(1) | IRQ_TYPE_LEVEL_LOW)>,
<GIC_PPI 10 (GIC_CPU_MASK_SIMPLE(1) | IRQ_TYPE_LEVEL_LOW)>;
interrupt-parent = <&intc>;
arm,no-tick-in-suspend;
};
clocks {