clocksource: Add devm_clocksource_register_*() helpers

Browse source

Introduce device-managed helpers for clocksource registration.

The clocksource framework currently provides __clocksource_register_scale()
along with convenience wrappers for Hz and kHz registration. However,
drivers must handle error paths and cleanup manually, typically by pairing
registration with an explicit clocksource_unregister() call.

Add a devm-based variant, __devm_clocksource_register_scale(), along with
devm_clocksource_register_hz() and devm_clocksource_register_khz() helpers.

These helpers register the clocksource and attach a devres action to
automatically unregister it on driver detach or probe failure.

This simplifies driver code by:

  * removing explicit cleanup paths
  * ensuring correct teardown ordering
  * aligning with the devm-based resource management model widely used
    across the kernel

While drivers can open-code devm_add_action_or_reset(), providing a
dedicated helper avoids duplication, reduces boilerplate, and ensures
consistent usage across drivers, following patterns used in other
subsystems.

This is also particularly useful for drivers built as modules, where
device-managed resource handling avoids manual cleanup in remove paths and
ensures correct teardown on module unload.

This helper is self-contained and can be adopted progressively by drivers.

No functional change.

Signed-off-by: Daniel Lezcano <daniel.lezcano@oss.qualcomm.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/20260506153831.605159-1-daniel.lezcano@oss.qualcomm.com

...

This commit is contained in:

Daniel Lezcano 2026-05-06 17:38:31 +02:00 • committed by Thomas Gleixner

parent 09d6818d3b

commit 3eb4923e68

2 changed files with 35 additions and 0 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

15

include/linux/clocksource.h

View file

20

kernel/time/clocksource.c

View file