ARM: sun4i/sun7i: RTC driver

This patch introduces the driver for the RTC in the Allwinner A10 and
A20 SoCs.

Signed-off-by: Carlo Caione <carlo.caione@gmail.com>
Acked-by: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 0077302..c2fa86c 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -1104,6 +1104,13 @@
 	  If you say Y here you will get support for the Hypervisor
 	  based RTC on SUN4V systems.
 
+config RTC_DRV_SUNXI
+	tristate "Allwinner sun4i/sun7i RTC"
+	depends on ARCH_SUNXI
+	help
+	  If you say Y here you will get support for the RTC found on
+	  Allwinner A10/A20.
+
 config RTC_DRV_STARFIRE
 	bool "Starfire RTC"
 	depends on SPARC64