linux-kernel - [PATCH V5 5/5] arm64: dts: imx8mm: Enable cpu-idle driver

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Date:   Wed, 10 Jul 2019 14:30:56 +0800
From:   Anson.Huang@....com
To:     catalin.marinas@....com, will@...nel.org, robh+dt@...nel.org,
        mark.rutland@....com, shawnguo@...nel.org, s.hauer@...gutronix.de,
        kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
        daniel.lezcano@...aro.org, tglx@...utronix.de,
        leonard.crestez@....com, aisheng.dong@....com,
        daniel.baluta@....com, ping.bai@....com, l.stach@...gutronix.de,
        abel.vesa@....com, andrew.smirnov@...il.com, ccaione@...libre.com,
        angus@...ea.ca, agx@...xcpu.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Cc:     Linux-imx@....com
Subject: [PATCH V5 5/5] arm64: dts: imx8mm: Enable cpu-idle driver

From: Anson Huang <Anson.Huang@....com>

Enable i.MX8MM cpu-idle using generic ARM cpu-idle driver, 2 states
are supported, details as below:

root@...8mmevk:~# cat /sys/devices/system/cpu/cpu0/cpuidle/state0/name
WFI
root@...8mmevk:~# cat /sys/devices/system/cpu/cpu0/cpuidle/state0/usage
3973
root@...8mmevk:~# cat /sys/devices/system/cpu/cpu0/cpuidle/state1/name
cpu-sleep-wait
root@...8mmevk:~# cat /sys/devices/system/cpu/cpu0/cpuidle/state1/usage
6647

Signed-off-by: Anson Huang <Anson.Huang@....com>
---
New patch, as this patch is based on other patches in this series, so I include it.
---
 arch/arm64/boot/dts/freescale/imx8mm.dtsi | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mm.dtsi b/arch/arm64/boot/dts/freescale/imx8mm.dtsi
index 8cf7f34..8f3ed39 100644
--- a/arch/arm64/boot/dts/freescale/imx8mm.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mm.dtsi
@@ -44,6 +44,20 @@
 		#address-cells = <1>;
 		#size-cells = <0>;
 
+		idle-states {
+			entry-method = "psci";
+
+			cpu_sleep_wait: cpu-sleep-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>;
+				wakeup-latency-us = <1500>;
+			};
+		};
+
 		A53_0: cpu@0 {
 			device_type = "cpu";
 			compatible = "arm,cortex-a53";
@@ -56,6 +70,7 @@
 			nvmem-cells = <&cpu_speed_grade>;
 			nvmem-cell-names = "speed_grade";
 			#cooling-cells = <2>;
+			cpu-idle-states = <&cpu_sleep_wait>;
 		};
 
 		A53_1: cpu@1 {
@@ -68,6 +83,7 @@
 			next-level-cache = <&A53_L2>;
 			operating-points-v2 = <&a53_opp_table>;
 			#cooling-cells = <2>;
+			cpu-idle-states = <&cpu_sleep_wait>;
 		};
 
 		A53_2: cpu@2 {
@@ -80,6 +96,7 @@
 			next-level-cache = <&A53_L2>;
 			operating-points-v2 = <&a53_opp_table>;
 			#cooling-cells = <2>;
+			cpu-idle-states = <&cpu_sleep_wait>;
 		};
 
 		A53_3: cpu@3 {
@@ -92,6 +109,7 @@
 			next-level-cache = <&A53_L2>;
 			operating-points-v2 = <&a53_opp_table>;
 			#cooling-cells = <2>;
+			cpu-idle-states = <&cpu_sleep_wait>;
 		};
 
 		A53_L2: l2-cache0 {
-- 
2.7.4