linux-kernel - [PATCH 2/2] arm64: dts: imx8mn: Enable cpu-idle driver

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Date:   Tue, 10 Sep 2019 11:25:18 -0400
From:   Anson Huang <Anson.Huang@....com>
To:     robh+dt@...nel.org, mark.rutland@....com, shawnguo@...nel.org,
        s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
        leonard.crestez@....com, daniel.baluta@....com,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Cc:     Linux-imx@....com
Subject: [PATCH 2/2] arm64: dts: imx8mn: Enable cpu-idle driver

Enable i.MX8MN cpu-idle using generic ARM cpu-idle driver, 2 states
are supported, details as below:

root@...8mnevk:~# cat /sys/devices/system/cpu/cpu0/cpuidle/state0/name
WFI
root@...8mnevk:~# cat /sys/devices/system/cpu/cpu0/cpuidle/state0/usage
3098
root@...8mnevk:~# cat /sys/devices/system/cpu/cpu0/cpuidle/state1/name
cpu-pd-wait
root@...8mnevk:~# cat /sys/devices/system/cpu/cpu0/cpuidle/state1/usage
3078

Signed-off-by: Anson Huang <Anson.Huang@....com>
---
 arch/arm64/boot/dts/freescale/imx8mn.dtsi | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mn.dtsi b/arch/arm64/boot/dts/freescale/imx8mn.dtsi
index 0166f8c..e4efe8d 100644
--- a/arch/arm64/boot/dts/freescale/imx8mn.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mn.dtsi
@@ -43,6 +43,19 @@
 		#address-cells = <1>;
 		#size-cells = <0>;
 
+		idle-states {
+			entry-method = "psci";
+
+			cpu_pd_wait: cpu-pd-wait {
+				compatible = "arm,idle-state";
+				arm,psci-suspend-param = <0x0010033>;
+				local-timer-stop;
+				entry-latency-us = <1000>;
+				exit-latency-us = <700>;
+				min-residency-us = <2700>;
+			};
+		};
+
 		A53_0: cpu@0 {
 			device_type = "cpu";
 			compatible = "arm,cortex-a53";
@@ -54,6 +67,7 @@
 			operating-points-v2 = <&a53_opp_table>;
 			nvmem-cells = <&cpu_speed_grade>;
 			nvmem-cell-names = "speed_grade";
+			cpu-idle-states = <&cpu_pd_wait>;
 		};
 
 		A53_1: cpu@1 {
@@ -65,6 +79,7 @@
 			enable-method = "psci";
 			next-level-cache = <&A53_L2>;
 			operating-points-v2 = <&a53_opp_table>;
+			cpu-idle-states = <&cpu_pd_wait>;
 		};
 
 		A53_2: cpu@2 {
@@ -76,6 +91,7 @@
 			enable-method = "psci";
 			next-level-cache = <&A53_L2>;
 			operating-points-v2 = <&a53_opp_table>;
+			cpu-idle-states = <&cpu_pd_wait>;
 		};
 
 		A53_3: cpu@3 {
@@ -87,6 +103,7 @@
 			enable-method = "psci";
 			next-level-cache = <&A53_L2>;
 			operating-points-v2 = <&a53_opp_table>;
+			cpu-idle-states = <&cpu_pd_wait>;
 		};
 
 		A53_L2: l2-cache0 {
-- 
2.7.4