drivers: rtc: Add Micro Crystal RV-8803-C7 RTC driver

This PR adds support for Micro Crystal RV-8803-C7
RTC chip.

Supported functionalities:
* Update interrupt
* Alarm interrupt
* Time setting/reading
* Alarm setting/reading
* Aging offset calibration setting/reading
* CLKOUT configuration

Tested on nRF52833-DK using rtc_api test set.

Signed-off-by: Marcin Lyda <elektromarcin@gmail.com>

Author: Lefucjusz

drivers/rtc/CMakeLists.txt

@@ -28,3 +28,4 @@ zephyr_library_sources_ifdef(CONFIG_RTC_RV3028 rtc_rv3028.c)
 zephyr_library_sources_ifdef(CONFIG_RTC_NUMAKER rtc_numaker.c)
 zephyr_library_sources_ifdef(CONFIG_RTC_XMC4XXX rtc_xmc4xxx.c)
 zephyr_library_sources_ifdef(CONFIG_RTC_NXP_IRTC rtc_nxp_irtc.c)
+zephyr_library_sources_ifdef(CONFIG_RTC_RV8803 rtc_rv8803.c)

drivers/rtc/Kconfig

@@ -60,5 +60,6 @@ source "drivers/rtc/Kconfig.numaker"
 source "drivers/rtc/Kconfig.rv8263"
 source "drivers/rtc/Kconfig.xmc4xxx"
 source "drivers/rtc/Kconfig.nxp_irtc"
+source "drivers/rtc/Kconfig.rv8803"
 
 endif # RTC

drivers/rtc/Kconfig.rv8803

@@ -0,0 +1,10 @@
+# Copyright (c) 2024 Marcin Lyda <elektromarcin@gmail.com>
+# SPDX-License-Identifier: Apache-2.0
+
+config RTC_RV8803
+	bool "Micro Crystal RV8803 Extreme Low Power Real-Time Clock Module driver"
+	default y
+	depends on DT_HAS_MICROCRYSTAL_RV8803_ENABLED
+	select I2C
+	help
+	    Enable Micro Crystal RV8803 I2C RTC driver.