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timekeeping: Add CONFIG_HAS_PERSISTENT_CLOCK option

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Make the persistent clock check a kernel config option, so that some
platform can explicitely select it, also make CONFIG_RTC_HCTOSYS and
RTC_SYSTOHC depend on its non-existence, which could prevent the
persistent clock and RTC code from doing similar thing twice during
system's init/suspend/resume phases.

If the CONFIG_HAS_PERSISTENT_CLOCK=n, then no change happens for kernel
which still does the persistent clock check in timekeeping_init().

Cc: Thomas Gleixner <[email protected]>
Suggested-by: John Stultz <[email protected]>
Signed-off-by: Feng Tang <[email protected]>
[jstultz: Added dependency for RTC_SYSTOHC as well]
Signed-off-by: John Stultz <[email protected]>
This commit is contained in:
Feng Tang 2013-01-16 00:09:49 +08:00 • committed by John Stultz
commit 05ad717c77
3 changed files with 12 additions and 0 deletions
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5
kernel/time/Kconfig
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@ -12,6 +12,11 @@ config CLOCKSOURCE_WATCHDOG
config ARCH_CLOCKSOURCE_DATA
bool
# Platforms has a persistent clock
config HAS_PERSISTENT_CLOCK
bool
default n
# Timekeeping vsyscall support
config GENERIC_TIME_VSYSCALL
bool