| .. SPDX-License-Identifier: GPL-2.0 |
| |
| ======================== |
| Device Frequency Scaling |
| ======================== |
| |
| Introduction |
| ------------ |
| |
| This framework provides a standard kernel interface for Dynamic Voltage and |
| Frequency Switching on arbitrary devices. |
| |
| It exposes controls for adjusting frequency through sysfs files which are |
| similar to the cpufreq subsystem. |
| |
| Devices for which current usage can be measured can have their frequency |
| automatically adjusted by governors. |
| |
| API |
| --- |
| |
| Device drivers need to initialize a :c:type:`devfreq_profile` and call the |
| :c:func:`devfreq_add_device` function to create a :c:type:`devfreq` instance. |
| |
| .. kernel-doc:: include/linux/devfreq.h |
| .. kernel-doc:: include/linux/devfreq-event.h |
| .. kernel-doc:: drivers/devfreq/devfreq.c |
| :export: |
| .. kernel-doc:: drivers/devfreq/devfreq-event.c |
| :export: |
