1.. SPDX-License-Identifier: GPL-2.0 2 3======================== 4Device Frequency Scaling 5======================== 6 7Introduction 8------------ 9 10This framework provides a standard kernel interface for Dynamic Voltage and 11Frequency Switching on arbitrary devices. 12 13It exposes controls for adjusting frequency through sysfs files which are 14similar to the cpufreq subsystem. 15 16Devices for which current usage can be measured can have their frequency 17automatically adjusted by governors. 18 19API 20--- 21 22Device drivers need to initialize a :c:type:`devfreq_profile` and call the 23:c:func:`devfreq_add_device` function to create a :c:type:`devfreq` instance. 24 25.. kernel-doc:: include/linux/devfreq.h 26.. kernel-doc:: include/linux/devfreq-event.h 27.. kernel-doc:: drivers/devfreq/devfreq.c 28 :export: 29.. kernel-doc:: drivers/devfreq/devfreq-event.c 30 :export: 31