drivers: rtc: sam0: Add realtime clock driver

Add Atmel sam0 rtc calendar driver.

Signed-off-by: Gerson Fernando Budke <[email protected]>

Author: nandojve

drivers/rtc/CMakeLists.txt

@@ -23,6 +23,7 @@ zephyr_library_sources_ifdef(CONFIG_RTC_SHELL rtc_shell.c)
 zephyr_library_sources_ifdef(CONFIG_RTC_FAKE rtc_fake.c)
 zephyr_library_sources_ifdef(CONFIG_RTC_SMARTBOND rtc_smartbond.c)
 zephyr_library_sources_ifdef(CONFIG_RTC_ATMEL_SAM rtc_sam.c)
+zephyr_library_sources_ifdef(CONFIG_RTC_ATMEL_SAM0 rtc_sam0.c)
 zephyr_library_sources_ifdef(CONFIG_RTC_RPI_PICO rtc_rpi_pico.c)
 zephyr_library_sources_ifdef(CONFIG_RTC_RV3028 rtc_rv3028.c)
 zephyr_library_sources_ifdef(CONFIG_RTC_NUMAKER rtc_numaker.c)

drivers/rtc/Kconfig

@@ -54,6 +54,7 @@ source "drivers/rtc/Kconfig.pcf8563"
 source "drivers/rtc/Kconfig.rpi_pico"
 source "drivers/rtc/Kconfig.rv3028"
 source "drivers/rtc/Kconfig.sam"
+source "drivers/rtc/Kconfig.sam0"
 source "drivers/rtc/Kconfig.smartbond"
 source "drivers/rtc/Kconfig.stm32"
 source "drivers/rtc/Kconfig.numaker"

drivers/rtc/Kconfig.sam0

@@ -0,0 +1,10 @@
+# Copyright (c) 2024-2025 Gerson Fernando Budke <[email protected]>
+# SPDX-License-Identifier: Apache-2.0
+
+config RTC_ATMEL_SAM0
+	bool "Atmel SAM RTC driver"
+	default y
+	depends on DT_HAS_ATMEL_SAM0_RTC_ENABLED \
+		&& !$(dt_nodelabel_bool_prop,rtc,systimer)
+	help
+	  Atmel Real-Time Clock (RTC) driver used on SAM0 SoC series.