diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 19c03ab..30a866a 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -48,6 +48,14 @@ config RTC_HCTOSYS_DEVICE
 	  sleep states. Do not specify an RTC here unless it stays powered
 	  during all this system's supported sleep states.
 
+config RTC_SYSTOHC
+	bool "Set the RTC time based on NTP synchronization"
+	default y
+	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 the NTP status is synchronized.
+
 config RTC_DEBUG
 	bool "RTC debug support"
 	help
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 56297f0..69d11f1 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -6,6 +6,7 @@ ccflags-$(CONFIG_RTC_DEBUG)	:= -DDEBUG
 
 obj-$(CONFIG_RTC_LIB)		+= rtc-lib.o
 obj-$(CONFIG_RTC_HCTOSYS)	+= hctosys.o
+obj-$(CONFIG_RTC_SYSTOHC)	+= systohc.o
 obj-$(CONFIG_RTC_CLASS)		+= rtc-core.o
 rtc-core-y			:= class.o interface.o
 
diff --git a/drivers/rtc/systohc.c b/drivers/rtc/systohc.c
new file mode 100644
index 0000000..0536cae
--- /dev/null
+++ b/drivers/rtc/systohc.c
@@ -0,0 +1,30 @@
+/*
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ */
+#include <linux/rtc.h>
+#include <linux/time.h>
+
+/* Replacement for the NTP platform function 'update_persistent_clock'
+ * that does the opposite of rtc_hctosys.c */
+int rtc_update_persistent_clock(struct timespec now)
+{
+	struct rtc_device *rtc;
+	struct rtc_time tm;
+	int err = -ENODEV;
+
+	if (now.tv_nsec < (NSEC_PER_SEC >> 1))
+		rtc_time_to_tm(now.tv_sec, &tm);
+	else
+		rtc_time_to_tm(now.tv_sec + 1, &tm);
+
+	rtc = rtc_class_open(CONFIG_RTC_HCTOSYS_DEVICE);
+	if (rtc) {
+		err = rtc_set_mmss(rtc, now.tv_sec);
+		rtc_class_close(rtc);
+	}
+
+	return err;
+}
diff --git a/include/linux/time.h b/include/linux/time.h
index 4d358e9..d668f9c 100644
--- a/include/linux/time.h
+++ b/include/linux/time.h
@@ -118,6 +118,7 @@ static inline bool timespec_valid_strict(const struct timespec *ts)
 extern void read_persistent_clock(struct timespec *ts);
 extern void read_boot_clock(struct timespec *ts);
 extern int update_persistent_clock(struct timespec now);
+extern int rtc_update_persistent_clock(struct timespec now);
 void timekeeping_init(void);
 extern int timekeeping_suspended;
 
diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 24174b4..f79ab16 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -483,7 +483,15 @@ out:
 	return leap;
 }
 
-#ifdef CONFIG_GENERIC_CMOS_UPDATE
+#if defined(CONFIG_GENERIC_CMOS_UPDATE) || defined(CONFIG_RTC_SYSTOHC)
+
+/* Only do one, if using CONFIG_RTC_SYSTOHC then the platform function
+ * might be mapped to the RTC code already. */
+#ifdef CONFIG_RTC_SYSTOHC
+#define __update_persistent_clock rtc_update_persistent_clock
+#else
+#define __update_persistent_clock update_persistent_clock
+#endif
 
 static void sync_cmos_clock(struct work_struct *work);
 
@@ -511,7 +519,7 @@ static void sync_cmos_clock(struct work_struct *work)
 
 	getnstimeofday(&now);
 	if (abs(now.tv_nsec - (NSEC_PER_SEC / 2)) <= tick_nsec / 2)
-		fail = update_persistent_clock(now);
+		fail = __update_persistent_clock(now);
 
 	next.tv_nsec = (NSEC_PER_SEC / 2) - now.tv_nsec - (TICK_NSEC / 2);
 	if (next.tv_nsec <= 0)