linux-kernel - [PATCH 4/4] thermal: cpuidle: Register cpuidle cooling device

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Message-Id: <20200329220324.8785-4-daniel.lezcano@linaro.org>
Date:   Mon, 30 Mar 2020 00:03:20 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     rafael@...nel.org, robh@...nel.org
Cc:     daniel.lezcano@...aro.org, "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Sudeep Holla <sudeep.holla@....com>,
        linux-pm@...r.kernel.org (open list:CPU IDLE TIME MANAGEMENT FRAMEWORK),
        linux-kernel@...r.kernel.org (open list),
        linux-arm-kernel@...ts.infradead.org (open list:CPUIDLE DRIVER - ARM
        PSCI)
Subject: [PATCH 4/4] thermal: cpuidle: Register cpuidle cooling device

The cpuidle driver can be used as a cooling device by injecting idle
cycles. The DT binding for the idle state added an optional

When the property is set, register the cpuidle driver with the idle
state node pointer as a cooling device. The thermal framework will do
the association automatically with the thermal zone via the
cooling-device defined in the device tree cooling-maps section.

Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
---
 drivers/cpuidle/cpuidle-arm.c  | 5 +++++
 drivers/cpuidle/cpuidle-psci.c | 5 +++++
 2 files changed, 10 insertions(+)

diff --git a/drivers/cpuidle/cpuidle-arm.c b/drivers/cpuidle/cpuidle-arm.c
index 9e5156d39627..2406ac0ae134 100644
--- a/drivers/cpuidle/cpuidle-arm.c
+++ b/drivers/cpuidle/cpuidle-arm.c
@@ -8,6 +8,7 @@
 
 #define pr_fmt(fmt) "CPUidle arm: " fmt
 
+#include <linux/cpu_cooling.h>
 #include <linux/cpuidle.h>
 #include <linux/cpumask.h>
 #include <linux/cpu_pm.h>
@@ -124,6 +125,10 @@ static int __init arm_idle_init_cpu(int cpu)
 	if (ret)
 		goto out_kfree_drv;
 
+	ret = cpuidle_cooling_register(drv);
+	if (ret)
+		pr_err("Failed to register the idle cooling device: %d\n", ret);
+
 	return 0;
 
 out_kfree_drv:
diff --git a/drivers/cpuidle/cpuidle-psci.c b/drivers/cpuidle/cpuidle-psci.c
index edd7a54ef0d3..8e805bff646f 100644
--- a/drivers/cpuidle/cpuidle-psci.c
+++ b/drivers/cpuidle/cpuidle-psci.c
@@ -9,6 +9,7 @@
 #define pr_fmt(fmt) "CPUidle PSCI: " fmt
 
 #include <linux/cpuhotplug.h>
+#include <linux/cpu_cooling.h>
 #include <linux/cpuidle.h>
 #include <linux/cpumask.h>
 #include <linux/cpu_pm.h>
@@ -305,6 +306,10 @@ static int __init psci_idle_init_cpu(int cpu)
 	if (ret)
 		goto out_kfree_drv;
 
+	ret = cpuidle_cooling_register(drv);
+	if (ret)
+		pr_err("Failed to register the idle cooling device: %d\n", ret);
+
 	return 0;
 
 out_kfree_drv:
-- 
2.17.1