From: Anson Huang <Anson.Huang@nxp.com>
To: robh+dt@kernel.org, mark.rutland@arm.com, shawnguo@kernel.org,
s.hauer@pengutronix.de, kernel@pengutronix.de,
festevam@gmail.com, leonard.crestez@nxp.com,
daniel.baluta@nxp.com, devicetree@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Cc: Linux-imx@nxp.com
Subject: [PATCH 2/2] arm64: dts: imx8mn: Enable cpu-idle driver
Date: Tue, 10 Sep 2019 11:25:18 -0400 [thread overview]
Message-ID: <1568129118-31114-2-git-send-email-Anson.Huang@nxp.com> (raw)
In-Reply-To: <1568129118-31114-1-git-send-email-Anson.Huang@nxp.com>
Enable i.MX8MN cpu-idle using generic ARM cpu-idle driver, 2 states
are supported, details as below:
root@imx8mnevk:~# cat /sys/devices/system/cpu/cpu0/cpuidle/state0/name
WFI
root@imx8mnevk:~# cat /sys/devices/system/cpu/cpu0/cpuidle/state0/usage
3098
root@imx8mnevk:~# cat /sys/devices/system/cpu/cpu0/cpuidle/state1/name
cpu-pd-wait
root@imx8mnevk:~# cat /sys/devices/system/cpu/cpu0/cpuidle/state1/usage
3078
Signed-off-by: Anson Huang <Anson.Huang@nxp.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
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next prev parent reply other threads:[~2019-09-10 3:26 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-10 15:25 [PATCH 1/2] arm64: dts: imx8mn: Add system counter node Anson Huang
2019-09-10 15:25 ` Anson Huang [this message]
2019-10-06 7:17 ` Shawn Guo
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