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PM / devfreq: Register devfreq as a cooling device on demand

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Currently the default behavior is to manually having the devfreq
backend to register themselves as a devfreq cooling device.

Instead of adding the code in the drivers for the thermal cooling
device registering, let's provide a flag in the devfreq's profile to
tell the common devfreq code to register the newly created devfreq as
a cooling device.

Suggested-by: Chanwoo Choi <cwchoi00@gmail.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Steven Price <steven.price@arm.com>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
This commit is contained in:
Daniel Lezcano
2021-03-08 14:30:37 +01:00
committed by Chanwoo Choi
parent fe07bfda2f
commit 1224451bb6
2 changed files with 18 additions and 0 deletions
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9
drivers/devfreq/devfreq.c
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@@ -11,6 +11,7 @@
#include <linux/kmod.h>
#include <linux/sched.h>
#include <linux/debugfs.h>
#include <linux/devfreq_cooling.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/init.h>
@@ -935,6 +936,12 @@ struct devfreq *devfreq_add_device(struct device *dev,
mutex_unlock(&devfreq_list_lock);
if (devfreq->profile->is_cooling_device) {
devfreq->cdev = devfreq_cooling_em_register(devfreq, NULL);
if (IS_ERR(devfreq->cdev))
devfreq->cdev = NULL;
}
return devfreq;
err_init:
@@ -960,6 +967,8 @@ int devfreq_remove_device(struct devfreq *devfreq)
if (!devfreq)
return -EINVAL;
devfreq_cooling_unregister(devfreq->cdev);
if (devfreq->governor) {
devfreq->governor->event_handler(devfreq,
DEVFREQ_GOV_STOP, NULL);