rtc: atcrtc100: Add ATCRTC100 RTC driver

RTC driver for Andes ATCRTC100 Real-Time Clock.

Signed-off-by: CL Wang <cl634@andestech.com>
Link: https://patch.msgid.link/20250915031439.2680364-4-cl634@andestech.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Author: CL Wang

drivers/rtc/Kconfig

@@ -1063,6 +1063,21 @@ config RTC_DRV_ALPHA
 	  Direct support for the real-time clock found on every Alpha
 	  system, specifically MC146818 compatibles.  If in doubt, say Y.
 
+config RTC_DRV_ATCRTC100
+	tristate "Andes ATCRTC100"
+	depends on ARCH_ANDES || COMPILE_TEST
+	select REGMAP_MMIO
+	help
+	  If you say yes here you will get support for the Andes ATCRTC100
+	  RTC driver.
+
+	  This driver provides support for the Andes ATCRTC100 real-time clock
+	  device. It allows setting and retrieving the time and date, as well
+	  as setting alarms.
+
+	  To compile this driver as a module, choose M here: the module will
+	  be called rtc-atcrtc100.
+
 config RTC_DRV_DS1216
 	tristate "Dallas DS1216"
 	depends on SNI_RM

drivers/rtc/Makefile

@@ -34,6 +34,7 @@ obj-$(CONFIG_RTC_DRV_ASM9260)	+= rtc-asm9260.o
 obj-$(CONFIG_RTC_DRV_ASPEED)	+= rtc-aspeed.o
 obj-$(CONFIG_RTC_DRV_AT91RM9200)+= rtc-at91rm9200.o
 obj-$(CONFIG_RTC_DRV_AT91SAM9)	+= rtc-at91sam9.o
+obj-$(CONFIG_RTC_DRV_ATCRTC100) += rtc-atcrtc100.o
 obj-$(CONFIG_RTC_DRV_AU1XXX)	+= rtc-au1xxx.o
 obj-$(CONFIG_RTC_DRV_BBNSM)	+= rtc-nxp-bbnsm.o
 obj-$(CONFIG_RTC_DRV_BD70528)	+= rtc-bd70528.o