linux-kernel - [PATCH 1/2] ARM: dts: imx7s: enable cpuidle driver

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Date:   Wed, 29 Aug 2018 13:00:46 +0800
From:   Anson Huang <Anson.Huang@....com>
To:     shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        fabio.estevam@....com, robh+dt@...nel.org, mark.rutland@....com,
        linux@...linux.org.uk, linux-arm-kernel@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Linux-imx@....com
Subject: [PATCH 1/2] ARM: dts: imx7s: enable cpuidle driver

Enable cpuidle for i.MX7S/D using generic ARM cpuidle
driver, below 2 idle states enabled:

1. ARM WFI;
2. SoC WAIT mode.

Signed-off-by: Anson Huang <Anson.Huang@....com>
---
 arch/arm/boot/dts/imx7d.dtsi |  1 +
 arch/arm/boot/dts/imx7s.dtsi | 14 ++++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/arch/arm/boot/dts/imx7d.dtsi b/arch/arm/boot/dts/imx7d.dtsi
index 7cbc2ff..4d0d0f6 100644
--- a/arch/arm/boot/dts/imx7d.dtsi
+++ b/arch/arm/boot/dts/imx7d.dtsi
@@ -20,6 +20,7 @@
 			reg = <1>;
 			clock-frequency = <996000000>;
 			operating-points-v2 = <&cpu0_opp_table>;
+			cpu-idle-states = <&CPU_SLEEP>;
 		};
 	};
 
diff --git a/arch/arm/boot/dts/imx7s.dtsi b/arch/arm/boot/dts/imx7s.dtsi
index 93884ce..cf5570b 100644
--- a/arch/arm/boot/dts/imx7s.dtsi
+++ b/arch/arm/boot/dts/imx7s.dtsi
@@ -54,6 +54,19 @@
 		#address-cells = <1>;
 		#size-cells = <0>;
 
+		idle-states {
+			entry-method = "psci";
+
+			CPU_SLEEP: WAIT {
+				compatible = "arm,idle-state";
+				arm,psci-suspend-param = <0x0010000>;
+				local-timer-stop;
+				entry-latency-us = <100>;
+				exit-latency-us = <50>;
+				min-residency-us = <1000>;
+			};
+		};
+
 		cpu0: cpu@0 {
 			compatible = "arm,cortex-a7";
 			device_type = "cpu";
@@ -61,6 +74,7 @@
 			clock-frequency = <792000000>;
 			clock-latency = <61036>; /* two CLK32 periods */
 			clocks = <&clks IMX7D_CLK_ARM>;
+			cpu-idle-states = <&CPU_SLEEP>;
 		};
 	};
 
-- 
2.7.4