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From: Sudeep Holla <sudeep.holla@arm.com>
To: linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org
Cc: Sudeep Holla <sudeep.holla@arm.com>,
	Lorenzo Pieralisi <lpieralisi@kernel.org>,
	Liviu Dudau <liviu.dudau@arm.com>, Leo Yan <leo.yan@arm.com>
Subject: [PATCH 2/3] arm64: dts: fvp: Add system timer for broadcast during CPU idle
Date: Thu,  8 May 2025 11:32:24 +0100	[thread overview]
Message-ID: <20250508103225.354925-2-sudeep.holla@arm.com> (raw)
In-Reply-To: <20250508103225.354925-1-sudeep.holla@arm.com>

Introduce a system-level timer node in the FVP device tree to act as
a broadcast timer when CPUs are in context losing idle states where
the local timer stops on entering such low power states.

This change complements recent CPU idle state additions.

Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
---
 arch/arm64/boot/dts/arm/fvp-base-revc.dts | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/arm64/boot/dts/arm/fvp-base-revc.dts b/arch/arm64/boot/dts/arm/fvp-base-revc.dts
index ff4e6f4d8797..c1e22ffca623 100644
--- a/arch/arm64/boot/dts/arm/fvp-base-revc.dts
+++ b/arch/arm64/boot/dts/arm/fvp-base-revc.dts
@@ -249,6 +249,20 @@ timer {
 			     <GIC_PPI 10 IRQ_TYPE_LEVEL_LOW>;
 	};
 
+	timer@2a810000 {
+		compatible = "arm,armv7-timer-mem";
+		reg = <0x0 0x2a810000 0x0 0x10000>;
+		clock-frequency = <100000000>;
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges;
+		frame@2a830000 {
+			frame-number = <1>;
+			interrupts = <0 26 4>;
+			reg = <0x0 0x2a830000 0x0 0x10000>;
+		};
+	};
+
 	pmu {
 		compatible = "arm,armv8-pmuv3";
 		interrupts = <GIC_PPI 7 IRQ_TYPE_LEVEL_HIGH>;
-- 
2.34.1


  reply	other threads:[~2025-05-08 10:32 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-05-08 10:32 [PATCH 1/3] arm64: dts: fvp: Add CPU idle states for Rev C model Sudeep Holla
2025-05-08 10:32 ` Sudeep Holla [this message]
2025-05-08 10:32 ` [PATCH 3/3] arm64: dts: fvp: Reserve 64MB for the FF-A firmware in memory map Sudeep Holla
2025-05-08 13:25 ` [PATCH 1/3] arm64: dts: fvp: Add CPU idle states for Rev C model Ben Horgan
2025-05-08 15:51   ` Sudeep Holla
2025-05-08 16:09 ` Leo Yan
2025-05-08 16:13   ` Sudeep Holla
2025-05-09 14:16 ` Rob Herring (Arm)
2025-05-09 15:29   ` Sudeep Holla

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