1 .. SPDX-License-Identifier: GPL-2.0 2 3 ======================== 4 Device Frequency Scaling 5 ======================== 6 7 Introduction 8 ------------ 9 10 This framework provides a standard kernel interface for Dynamic Voltage and 11 Frequency Switching on arbitrary devices. 12 13 It exposes controls for adjusting frequency through sysfs files which are 14 similar to the cpufreq subsystem. 15 16 Devices for which current usage can be measured can have their frequency 17 automatically adjusted by governors. 18 19 API 20 --- 21 22 Device 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:
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