rtc: Add driver for Epson RX8111

Epson RX8111 is an RTC with alarm, timer and timestamp functionality.
Add a basic driver with support for only reading/writing time (for now).
Signed-off-by: Waqar Hameed <waqar.hameed@axis.com>
Link: https://lore.kernel.org/r/0c3e1b03f276da47b26ac50f5d0ddf5c67aabe5c.1700491765.git.waqar.hameed@axis.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

drivers/rtc/Kconfig

@@ -664,6 +664,16 @@ config RTC_DRV_RX8010
 	  This driver can also be built as a module. If so, the module
 	  will be called rtc-rx8010.
 
+config RTC_DRV_RX8111
+	tristate "Epson RX8111"
+	select REGMAP_I2C
+	depends on I2C
+	help
+	  If you say yes here you will get support for the Epson RX8111 RTC.
+
+	  This driver can also be built as a module. If so, the module will be
+	  called rtc-rx8111.
+
 config RTC_DRV_RX8581
 	tristate "Epson RX-8571/RX-8581"
 	select REGMAP_I2C

drivers/rtc/Makefile

@@ -154,6 +154,7 @@ obj-$(CONFIG_RTC_DRV_RX4581)	+= rtc-rx4581.o
 obj-$(CONFIG_RTC_DRV_RX6110)	+= rtc-rx6110.o
 obj-$(CONFIG_RTC_DRV_RX8010)	+= rtc-rx8010.o
 obj-$(CONFIG_RTC_DRV_RX8025)	+= rtc-rx8025.o
+obj-$(CONFIG_RTC_DRV_RX8111)	+= rtc-rx8111.o
 obj-$(CONFIG_RTC_DRV_RX8581)	+= rtc-rx8581.o
 obj-$(CONFIG_RTC_DRV_RZN1)	+= rtc-rzn1.o
 obj-$(CONFIG_RTC_DRV_S35390A)	+= rtc-s35390a.o