linux-kernel - [PATCH v3 8/8] arm64: dts: st: use lptimer3 as tick broadcast source on stm32mp257f-ev1

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Message-ID: <20250305094935.595667-9-fabrice.gasnier@foss.st.com>
Date: Wed, 5 Mar 2025 10:49:35 +0100
From: Fabrice Gasnier <fabrice.gasnier@...s.st.com>
To: <lee@...nel.org>, <ukleinek@...nel.org>, <alexandre.torgue@...s.st.com>,
        <robh@...nel.org>, <krzk+dt@...nel.org>, <conor+dt@...nel.org>,
        <jic23@...nel.org>, <daniel.lezcano@...aro.org>, <tglx@...utronix.de>
CC: <catalin.marinas@....com>, <will@...nel.org>, <devicetree@...r.kernel.org>,
        <wbg@...nel.org>, <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <linux-iio@...r.kernel.org>, <linux-pwm@...r.kernel.org>,
        <olivier.moysan@...s.st.com>, <fabrice.gasnier@...s.st.com>
Subject: [PATCH v3 8/8] arm64: dts: st: use lptimer3 as tick broadcast source on stm32mp257f-ev1

During the low power modes the generic ARM timer is deactivated, so the
the tick broadcast is used, based on LPTIMER3 which is clocked by LSE on
STMicroelectronics boards.

Signed-off-by: Patrick Delaunay <patrick.delaunay@...s.st.com>
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@...s.st.com>
---
 arch/arm64/boot/dts/st/stm32mp257f-ev1.dts | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/arm64/boot/dts/st/stm32mp257f-ev1.dts b/arch/arm64/boot/dts/st/stm32mp257f-ev1.dts
index 1b88485a62a1..242115863ab4 100644
--- a/arch/arm64/boot/dts/st/stm32mp257f-ev1.dts
+++ b/arch/arm64/boot/dts/st/stm32mp257f-ev1.dts
@@ -190,6 +190,14 @@ &i2c8 {
 	status = "disabled";
 };
 
+/* use LPTIMER with tick broadcast for suspend mode */
+&lptimer3 {
+	status = "okay";
+	timer {
+		status = "okay";
+	};
+};
+
 &rtc {
 	status = "okay";
 };
-- 
2.25.1