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

[Alexandre TORGUE]

Hi Marek

On 5/13/24 23:58, Marek Vasut wrote:
> 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: 8471a20253eb ("ARM: dts: stm32: add stm32mp157c initial support")
> Signed-off-by: Marek Vasut <marex at denx.de>
> ---
> Cc: Alexandre Torgue <alexandre.torgue at foss.st.com>
> Cc: Conor Dooley <conor+dt at kernel.org>
> Cc: Krzysztof Kozlowski <krzk+dt at kernel.org>
> Cc: Maxime Coquelin <mcoquelin.stm32 at gmail.com>
> Cc: Rob Herring <robh at kernel.org>
> Cc: devicetree at vger.kernel.org
> Cc: linux-arm-kernel at lists.infradead.org
> Cc: linux-stm32 at st-md-mailman.stormreply.com
> ---
>   arch/arm/boot/dts/st/stm32mp151.dtsi | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm/boot/dts/st/stm32mp151.dtsi b/arch/arm/boot/dts/st/stm32mp151.dtsi
> index 3b705e7fe5c0d..68846699b26fd 100644
> --- a/arch/arm/boot/dts/st/stm32mp151.dtsi
> +++ b/arch/arm/boot/dts/st/stm32mp151.dtsi
> @@ -50,6 +50,7 @@ timer {
>   			     <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 {

Applied on stm32-next.

Thanks
Alex