diff options
Diffstat (limited to 'kernel/time')
| -rw-r--r-- | kernel/time/clockevents.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c index e4c699d..a8a3d49 100644 --- a/kernel/time/clockevents.c +++ b/kernel/time/clockevents.c @@ -133,6 +133,30 @@ int clockevents_program_event(struct clock_event_device *dev, ktime_t expires, } /** + * clockevents_reconfigure - Reconfigure and reprogram a clock event device. + * @dev: device to modify + * @freq: new device frequency + * @secr: guaranteed runtime conversion range in seconds + * + * Reconfigure and reprogram a clock event device in oneshot + * mode. Must only be called from low level idle code where + * interaction with hrtimers/nohz code etc. is not possible and + * guaranteed not to conflict. Must be called with interrupts + * disabled! + * Returns 0 on success, -ETIME when the event is in the past or + * -EINVAL when called with invalid parameters. + */ +int clockevents_reconfigure(struct clock_event_device *dev, u32 freq, u32 secr) +{ + if (dev->mode != CLOCK_EVT_MODE_ONESHOT) + return -EINVAL; + + clockevents_calc_mult_shift(dev, freq, secr ? secr : 1); + + return clockevents_program_event(dev, dev->next_event, ktime_get()); +} + +/** * clockevents_register_notifier - register a clock events change listener */ int clockevents_register_notifier(struct notifier_block *nb) |