From 75467f60a3d14f08f86f2b353298d2826382ff23 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Fri, 25 Sep 2026 15:55:03 -0700 Subject: Merge tag 'ipe-pr-20260925' of git://git.kernel.org/pub/scm/linux/kernel/git/wufan/ipe Pull IPE fixes from Fan Wu: "Two fixes for use-after-free issues found by recent LLM-assisted code analysis. - move successful policy load auditing under the new policy directory's inode lock, preventing a concurrent policy deletion from freeing the policy while it is still being audited - protect the dm-verity root hash with RCU, preventing policy evaluation from racing with root hash replacement during preresume" * tag 'ipe-pr-20260925' of git://git.kernel.org/pub/scm/linux/kernel/git/wufan/ipe: ipe: protect the dm-verity root hash with RCU ipe: fix use-after-free when auditing a newly loaded policy --- Documentation/driver-api/devfreq.rst | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) create mode 100644 Documentation/driver-api/devfreq.rst (limited to 'Documentation/driver-api/devfreq.rst') diff --git a/Documentation/driver-api/devfreq.rst b/Documentation/driver-api/devfreq.rst new file mode 100644 index 000000000..4a0bf87a3 --- /dev/null +++ b/Documentation/driver-api/devfreq.rst @@ -0,0 +1,30 @@ +.. 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: -- cgit v1.3.1