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| author | Johannes Berg <johannes.berg@intel.com> | 2021-01-15 15:12:18 +0300 |
|---|---|---|
| committer | Richard Weinberger <richard@nod.at> | 2021-02-12 23:38:52 +0300 |
| commit | dde8b58d512703d396e02427de1053b4d912aa42 (patch) | |
| tree | 1536dfa429585580bdc252afb9bc0639d937d830 /arch/um/drivers/Kconfig | |
| parent | bfc58e2b98e99737409cd9f4d86a79677c5b887c (diff) | |
| download | linux-dde8b58d512703d396e02427de1053b4d912aa42.tar.xz | |
um: add a pseudo RTC
Add a pseudo RTC that simply is able to send an alarm signal
waking up the system at a given time in the future.
Since apparently timerfd_create() FDs don't support SIGIO, we
use the sigio-creating helper thread, which just learned to do
suspend/resume properly in the previous patch.
For time-travel mode, OTOH, just add an event at the specified
time in the future, and that's already sufficient to wake up
the system at that point in time since suspend will just be in
an "endless wait".
For s2idle support also call pm_system_wakeup().
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'arch/um/drivers/Kconfig')
| -rw-r--r-- | arch/um/drivers/Kconfig | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/um/drivers/Kconfig b/arch/um/drivers/Kconfig index 58e3ffc17b7d..03ba34b61115 100644 --- a/arch/um/drivers/Kconfig +++ b/arch/um/drivers/Kconfig @@ -346,3 +346,14 @@ config VIRTIO_UML help This driver provides support for virtio based paravirtual device drivers over vhost-user sockets. + +config UML_RTC + bool "UML RTC driver" + depends on RTC_CLASS + # there's no use in this if PM_SLEEP isn't enabled ... + depends on PM_SLEEP + help + When PM_SLEEP is configured, it may be desirable to wake up using + rtcwake, especially in time-travel mode. This driver enables that + by providing a fake RTC clock that causes a wakeup at the right + time. |