From: Marek Vasut <marex@denx.de>
To: linux-arm-kernel@lists.infradead.org
Cc: Marek Vasut <marex@denx.de>,
Alexandre Torgue <alexandre.torgue@foss.st.com>,
Conor Dooley <conor+dt@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Maxime Coquelin <mcoquelin.stm32@gmail.com>,
Rob Herring <robh@kernel.org>,
devicetree@vger.kernel.org,
linux-stm32@st-md-mailman.stormreply.com
Subject: [PATCH] ARM: dts: stm32: Add arm,no-tick-in-suspend to STM32MP15xx STGEN timer
Date: Mon, 13 May 2024 23:58:15 +0200 [thread overview]
Message-ID: <20240513215835.183402-1-marex@denx.de> (raw)
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@denx.de>
---
Cc: Alexandre Torgue <alexandre.torgue@foss.st.com>
Cc: Conor Dooley <conor+dt@kernel.org>
Cc: Krzysztof Kozlowski <krzk+dt@kernel.org>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Rob Herring <robh@kernel.org>
Cc: devicetree@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-stm32@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 {
--
2.43.0
reply other threads:[~2024-05-13 21:58 UTC|newest]
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