esp32s3: Add support to RTC

Author: acassis

arch/xtensa/src/esp32s3/Kconfig

@@ -313,6 +313,10 @@ config ESP32S3_DMA
 	default n
 	select ARCH_DMA
 
+config ESP32S3_RTC
+	bool "Real Time Clock (RTC)"
+	default y
+
 config ESP32S3_UART0
 	bool "UART 0"
 	default n

arch/xtensa/src/esp32s3/Make.defs

@@ -135,3 +135,10 @@ endif
 ifeq ($(CONFIG_ESP32S3_WIRELESS),y)
 include chip/Wireless.mk
 endif
+
+ifeq ($(CONFIG_ESP32S3_RTC),y)
+CHIP_CSRCS += esp32s3_rtc.c
+ifeq ($(CONFIG_RTC_DRIVER),y)
+CHIP_CSRCS += esp32s3_rtc_lowerhalf.c
+endif
+endif