rtc: Add NCT3018Y real time clock driver

Add real time clock support for NCT3018Y.
Signed-off-by: Mia Lin <mimi05633@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20220713090647.8028-4-mimi05633@gmail.com

MAINTAINERS

@@ -2451,6 +2451,7 @@ F:	arch/arm/boot/dts/nuvoton-npcm*
 F:	arch/arm/mach-npcm/
 F:	drivers/*/*npcm*
 F:	drivers/*/*/*npcm*
+F:	drivers/rtc/rtc-nct3018y.c
 F:	include/dt-bindings/clock/nuvoton,npcm7xx-clock.h
 
 ARM/NUVOTON WPCM450 ARCHITECTURE

drivers/rtc/Kconfig

@@ -383,6 +383,16 @@ config RTC_DRV_MAX77686
 	  This driver can also be built as a module. If so, the module
 	  will be called rtc-max77686.
 
+config RTC_DRV_NCT3018Y
+	tristate "Nuvoton NCT3018Y"
+	depends on OF
+	help
+	   If you say yes here you get support for the Nuvoton NCT3018Y I2C RTC
+	   chip.
+
+	   This driver can also be built as a module, if so, the module will be
+	   called "rtc-nct3018y".
+
 config RTC_DRV_RK808
 	tristate "Rockchip RK805/RK808/RK809/RK817/RK818 RTC"
 	depends on MFD_RK808

drivers/rtc/Makefile

@@ -112,6 +112,7 @@ obj-$(CONFIG_RTC_DRV_MV)	+= rtc-mv.o
 obj-$(CONFIG_RTC_DRV_MXC)	+= rtc-mxc.o
 obj-$(CONFIG_RTC_DRV_MXC_V2)	+= rtc-mxc_v2.o
 obj-$(CONFIG_RTC_DRV_GAMECUBE)	+= rtc-gamecube.o
+obj-$(CONFIG_RTC_DRV_NCT3018Y)	+= rtc-nct3018y.o
 obj-$(CONFIG_RTC_DRV_NTXEC)	+= rtc-ntxec.o
 obj-$(CONFIG_RTC_DRV_OMAP)	+= rtc-omap.o
 obj-$(CONFIG_RTC_DRV_OPAL)	+= rtc-opal.o