RTC: Revert UIE emulation removal

[platform/adaptation/renesas_rcar/renesas_kernel.git] / drivers / rtc / Kconfig

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index cdd9719..4941cad 100644 (file)
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -97,6 +97,18 @@ config RTC_INTF_DEV
 
          If unsure, say Y.
 
+config RTC_INTF_DEV_UIE_EMUL
+       bool "RTC UIE emulation on dev interface"
+       depends on RTC_INTF_DEV
+       help
+         Provides an emulation for RTC_UIE if the underlying rtc chip
+         driver does not expose RTC_UIE ioctls. Those requests generate
+         once-per-second update interrupts, used for synchronization.
+
+         The emulation code will read the time from the hardware
+         clock several times per second, please enable this option
+         only if you know that you really need it.
+
 config RTC_DRV_TEST
        tristate "Test driver/device"
        help