linux-kernel - [PATCH 04/10] arm64: dts: imx8ulp: add cpuidle node

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Date:   Sun, 25 Jun 2023 20:42:32 +0800
From:   "Peng Fan (OSS)" <peng.fan@....nxp.com>
To:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        shawnguo@...nel.org, s.hauer@...gutronix.de
Cc:     kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Peng Fan <peng.fan@....com>,
        Jacky Bai <ping.bai@....com>
Subject: [PATCH 04/10] arm64: dts: imx8ulp: add cpuidle node

From: Peng Fan <peng.fan@....com>

Add cpuidle node and enable cpuidle for dual cores. The HW mode in
Arm Trusted Firmware is SoC Application Power Domain Sleep mode.

Signed-off-by: Jacky Bai <ping.bai@....com>
Signed-off-by: Peng Fan <peng.fan@....com>
---
 arch/arm64/boot/dts/freescale/imx8ulp.dtsi | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8ulp.dtsi b/arch/arm64/boot/dts/freescale/imx8ulp.dtsi
index fd30475a561d..16906c20bce9 100644
--- a/arch/arm64/boot/dts/freescale/imx8ulp.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8ulp.dtsi
@@ -40,6 +40,7 @@ A35_0: cpu@0 {
 			reg = <0x0 0x0>;
 			enable-method = "psci";
 			next-level-cache = <&A35_L2>;
+			cpu-idle-states = <&cpu_sleep>;
 		};
 
 		A35_1: cpu@1 {
@@ -48,6 +49,7 @@ A35_1: cpu@1 {
 			reg = <0x0 0x1>;
 			enable-method = "psci";
 			next-level-cache = <&A35_L2>;
+			cpu-idle-states = <&cpu_sleep>;
 		};
 
 		A35_L2: l2-cache0 {
@@ -55,6 +57,19 @@ A35_L2: l2-cache0 {
 			cache-level = <2>;
 			cache-unified;
 		};
+
+		idle-states {
+			entry-method = "psci";
+
+			cpu_sleep: cpu-sleep {
+				compatible = "arm,idle-state";
+				arm,psci-suspend-param = <0x0>;
+				local-timer-stop;
+				entry-latency-us = <1000>;
+				exit-latency-us = <700>;
+				min-residency-us = <2700>;
+			};
+		};
 	};
 
 	gic: interrupt-controller@...00000 {
-- 
2.37.1