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| author | MyungJoo Ham <myungjoo.ham@samsung.com> | 2013-02-05 09:40:17 +0000 |
|---|---|---|
| committer | Chanho Park <chanho61.park@samsung.com> | 2014-11-18 11:47:51 +0900 |
| commit | 58041c2e9e8fb7afc0d6b733736c4a9645e55860 (patch) | |
| tree | 83cc765c29b3bf348eb510814bf3c76ffe8307e5 | |
| parent | 1bf8d4cfb721a2258b25f2b6ad234b624c0db9d8 (diff) | |
| download | linux-3.10-58041c2e9e8fb7afc0d6b733736c4a9645e55860.tar.gz linux-3.10-58041c2e9e8fb7afc0d6b733736c4a9645e55860.tar.bz2 linux-3.10-58041c2e9e8fb7afc0d6b733736c4a9645e55860.zip | |
PM / devfreq: add comments and Documentation
- Added missing ABI documents
- Added comments to clarify the objectives of functions
Change-Id: Ic2206ad6671156eedb28d450046e8e2ea876b18c
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Acked-by: Nishanth Menon <nm@ti.com>
Acked-by: Rajagopal Venkat <rajagopal.venkat@linaro.org>
| -rw-r--r-- | Documentation/ABI/testing/sysfs-class-devfreq | 20 | ||||
| -rw-r--r-- | drivers/devfreq/devfreq.c | 10 | ||||
| -rw-r--r-- | include/linux/devfreq.h | 2 |
3 files changed, 32 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-class-devfreq b/Documentation/ABI/testing/sysfs-class-devfreq index 0ba6ea2f89d..ee39acacf6f 100644 --- a/Documentation/ABI/testing/sysfs-class-devfreq +++ b/Documentation/ABI/testing/sysfs-class-devfreq @@ -78,3 +78,23 @@ Contact: Nishanth Menon <nm@ti.com> Description: The /sys/class/devfreq/.../available_governors shows currently available governors in the system. + +What: /sys/class/devfreq/.../min_freq +Date: January 2013 +Contact: MyungJoo Ham <myungjoo.ham@samsung.com> +Description: + The /sys/class/devfreq/.../min_freq shows and stores + the minimum frequency requested by users. It is 0 if + the user does not care. min_freq overrides the + frequency requested by governors. + +What: /sys/class/devfreq/.../max_freq +Date: January 2013 +Contact: MyungJoo Ham <myungjoo.ham@samsung.com> +Description: + The /sys/class/devfreq/.../max_freq shows and stores + the maximum frequency requested by users. It is 0 if + the user does not care. max_freq overrides the + frequency requested by governors and min_freq. + The max_freq overrides min_freq because max_freq may be + used to throttle devices to avoid overheating. diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index abfa14dd8b4..44c407986f6 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -527,6 +527,8 @@ EXPORT_SYMBOL(devfreq_add_device); /** * devfreq_remove_device() - Remove devfreq feature from a device. * @devfreq: the devfreq instance to be removed + * + * The opposite of devfreq_add_device(). */ int devfreq_remove_device(struct devfreq *devfreq) { @@ -542,6 +544,10 @@ EXPORT_SYMBOL(devfreq_remove_device); /** * devfreq_suspend_device() - Suspend devfreq of a device. * @devfreq: the devfreq instance to be suspended + * + * This function is intended to be called by the pm callbacks + * (e.g., runtime_suspend, suspend) of the device driver that + * holds the devfreq. */ int devfreq_suspend_device(struct devfreq *devfreq) { @@ -559,6 +565,10 @@ EXPORT_SYMBOL(devfreq_suspend_device); /** * devfreq_resume_device() - Resume devfreq of a device. * @devfreq: the devfreq instance to be resumed + * + * This function is intended to be called by the pm callbacks + * (e.g., runtime_resume, resume) of the device driver that + * holds the devfreq. */ int devfreq_resume_device(struct devfreq *devfreq) { diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h index fe8c4476f7e..5f1ab92107e 100644 --- a/include/linux/devfreq.h +++ b/include/linux/devfreq.h @@ -181,6 +181,8 @@ extern struct devfreq *devfreq_add_device(struct device *dev, const char *governor_name, void *data); extern int devfreq_remove_device(struct devfreq *devfreq); + +/* Supposed to be called by PM_SLEEP/PM_RUNTIME callbacks */ extern int devfreq_suspend_device(struct devfreq *devfreq); extern int devfreq_resume_device(struct devfreq *devfreq); |