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authorFeng Tang <feng.tang@intel.com>2013-01-16 00:09:49 +0800
committerJohn Stultz <john.stultz@linaro.org>2013-01-15 18:16:08 -0800
commit05ad717c77b1b8e98a1dd768c3700036d634629e (patch)
treec52d75ca925bcd9b4c7125aad4c1059d7d3a43ee /drivers/rtc/Kconfig
parent9ecf37eb7a81e3295a1b274eafb6f83d7d2cabf0 (diff)
downloadlinux-05ad717c77b1b8e98a1dd768c3700036d634629e.tar.bz2
timekeeping: Add CONFIG_HAS_PERSISTENT_CLOCK option
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 <tglx@linutronix.de> Suggested-by: John Stultz <john.stultz@linaro.org> Signed-off-by: Feng Tang <feng.tang@intel.com> [jstultz: Added dependency for RTC_SYSTOHC as well] Signed-off-by: John Stultz <john.stultz@linaro.org>
Diffstat (limited to 'drivers/rtc/Kconfig')
-rw-r--r--drivers/rtc/Kconfig2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index b377e9672497..05761de7929b 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -20,6 +20,7 @@ if RTC_CLASS
config RTC_HCTOSYS
bool "Set system time from RTC on startup and resume"
default y
+ depends on !HAS_PERSISTENT_CLOCK
help
If you say yes here, the system time (wall clock) will be set using
the value read from a specified RTC device. This is useful to avoid
@@ -28,6 +29,7 @@ config RTC_HCTOSYS
config RTC_SYSTOHC
bool "Set the RTC time based on NTP synchronization"
default y
+ depends on !HAS_PERSISTENT_CLOCK
help
If you say yes here, the system time (wall clock) will be stored
in the RTC specified by RTC_HCTOSYS_DEVICE approximately every 11