linux-kernel - [PATCHv1 5/8] arm64: dts: qcom: qcs404: Add PSCI cpuidle low power states

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Date:   Fri, 10 May 2019 16:59:43 +0530
From:   Amit Kucheria <amit.kucheria@...aro.org>
To:     linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        bjorn.andersson@...aro.org, andy.gross@...aro.org,
        David Brown <david.brown@...aro.org>,
        Li Yang <leoyang.li@....com>, Shawn Guo <shawnguo@...nel.org>
Cc:     Niklas Cassel <niklas.cassel@...aro.org>,
        devicetree@...r.kernel.org
Subject: [PATCHv1 5/8] arm64: dts: qcom: qcs404: Add PSCI cpuidle low power states

From: Niklas Cassel <niklas.cassel@...aro.org>

Add device bindings for cpuidle states for cpu devices.

[amit: rename the idle-states to more generic names and fixups]

Signed-off-by: Niklas Cassel <niklas.cassel@...aro.org>
Reviewed-by: Vinod Koul <vkoul@...nel.org>
Signed-off-by: Amit Kucheria <amit.kucheria@...aro.org>
---
 arch/arm64/boot/dts/qcom/qcs404.dtsi | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/qcs404.dtsi b/arch/arm64/boot/dts/qcom/qcs404.dtsi
index e8fd26633d57..369c59c35bc7 100644
--- a/arch/arm64/boot/dts/qcom/qcs404.dtsi
+++ b/arch/arm64/boot/dts/qcom/qcs404.dtsi
@@ -30,6 +30,7 @@
 			compatible = "arm,cortex-a53";
 			reg = <0x100>;
 			enable-method = "psci";
+			cpu-idle-states = <&CPU_SLEEP_0>;
 			next-level-cache = <&L2_0>;
 		};
 
@@ -38,6 +39,7 @@
 			compatible = "arm,cortex-a53";
 			reg = <0x101>;
 			enable-method = "psci";
+			cpu-idle-states = <&CPU_SLEEP_0>;
 			next-level-cache = <&L2_0>;
 		};
 
@@ -46,6 +48,7 @@
 			compatible = "arm,cortex-a53";
 			reg = <0x102>;
 			enable-method = "psci";
+			cpu-idle-states = <&CPU_SLEEP_0>;
 			next-level-cache = <&L2_0>;
 		};
 
@@ -54,6 +57,7 @@
 			compatible = "arm,cortex-a53";
 			reg = <0x103>;
 			enable-method = "psci";
+			cpu-idle-states = <&CPU_SLEEP_0>;
 			next-level-cache = <&L2_0>;
 		};
 
@@ -61,6 +65,20 @@
 			compatible = "cache";
 			cache-level = <2>;
 		};
+
+		idle-states {
+			entry-method="psci";
+
+			CPU_SLEEP_0: cpu-sleep-0 {
+				compatible = "arm,idle-state";
+				idle-state-name = "standalone-power-collapse";
+				arm,psci-suspend-param = <0x40000003>;
+				entry-latency-us = <125>;
+				exit-latency-us = <180>;
+				min-residency-us = <595>;
+				local-timer-stop;
+			};
+		};
 	};
 
 	firmware {
-- 
2.17.1