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Message-Id: <1565950383-589-1-git-send-email-Anson.Huang@nxp.com>
Date: Fri, 16 Aug 2019 06:13:03 -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,
Anson.Huang@....com, leonard.crestez@....com, abel.vesa@....com,
ping.bai@....com, jun.li@....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] arm64: dts: imx8mm: Enable cpu-idle driver
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-pd-wait
root@...8mmevk:~# cat /sys/devices/system/cpu/cpu0/cpuidle/state1/usage
6647
Signed-off-by: Anson Huang <Anson.Huang@....com>
Acked-by: Daniel Lezcano <daniel.lezcano@...aro.org>
---
arch/arm64/boot/dts/freescale/imx8mm.dtsi | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/arch/arm64/boot/dts/freescale/imx8mm.dtsi b/arch/arm64/boot/dts/freescale/imx8mm.dtsi
index e8560d1..984ea7b 100644
--- a/arch/arm64/boot/dts/freescale/imx8mm.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mm.dtsi
@@ -44,6 +44,19 @@
#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";
@@ -55,6 +68,7 @@
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 {
@@ -66,6 +80,7 @@
enable-method = "psci";
next-level-cache = <&A53_L2>;
operating-points-v2 = <&a53_opp_table>;
+ cpu-idle-states = <&cpu_pd_wait>;
};
A53_2: cpu@2 {
@@ -77,6 +92,7 @@
enable-method = "psci";
next-level-cache = <&A53_L2>;
operating-points-v2 = <&a53_opp_table>;
+ cpu-idle-states = <&cpu_pd_wait>;
};
A53_3: cpu@3 {
@@ -88,6 +104,7 @@
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
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