timekeeping: Add CONFIG_HAS_PERSISTENT_CLOCK option

[deliverable/linux.git] / drivers / rtc / Kconfig

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 19c03ab2bdcb3f2d585c7b38948b5de3bff113c1..05761de7929bf370ae6736cb28d942bf88bd89ad 100644 (file)
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -20,14 +20,24 @@ 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
          unnecessary fsck runs at boot time, and to network better.
 
+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
+         minutes if userspace reports synchronized NTP status.
+
 config RTC_HCTOSYS_DEVICE
        string "RTC used to set the system time"
-       depends on RTC_HCTOSYS = y
+       depends on RTC_HCTOSYS = y || RTC_SYSTOHC = y
        default "rtc0"
        help
          The RTC device that will be used to (re)initialize the system