drivers: rtc: Driver implementation for stm32u5

 - this illustrates RTC API proposal
 - this driver use stm32 hal API

Signed-off-by: FAURANT Nicolas <[email protected]>

Author: nfaurant

drivers/CMakeLists.txt

@@ -28,6 +28,7 @@ add_subdirectory_ifdef(CONFIG_LED_STRIP led_strip)
 add_subdirectory_ifdef(CONFIG_MODEM modem)
 add_subdirectory_ifdef(CONFIG_PINMUX pinmux)
 add_subdirectory_ifdef(CONFIG_PWM pwm)
+add_subdirectory_ifdef(CONFIG_RTC rtc)
 add_subdirectory_ifdef(CONFIG_SENSOR sensor)
 add_subdirectory_ifdef(CONFIG_SPI spi)
 add_subdirectory_ifdef(CONFIG_WATCHDOG watchdog)

drivers/Kconfig

@@ -127,4 +127,6 @@ source "drivers/pinctrl/Kconfig"
 
 source "drivers/mbox/Kconfig"
 
+source "drivers/rtc/Kconfig"
+
 endmenu

drivers/rtc/CMakeLists.txt

@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: Apache-2.0
+
+zephyr_library()
+
+zephyr_library_sources_ifdef(CONFIG_RTC_STM32         rtc_hal_stm32u5.c)
+

drivers/rtc/Kconfig

@@ -0,0 +1,21 @@
+# RTC driver configuration options
+
+# Copyright (c) 2015 Intel Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+#
+# RTC drivers
+#
+menuconfig RTC
+	bool "RTC drivers"
+	help
+	  Enable RTC (Real Time Clock) driver configuration.
+
+if RTC
+
+module = RTC
+module-str = RTC
+
+source "drivers/rtc/Kconfig.stm32"
+
+endif # RTC

drivers/rtc/Kconfig.stm32

@@ -0,0 +1,16 @@
+# Copyright (c) 2021 LACROIX Group
+# SPDX-License-Identifier: Apache-2.0
+
+config RTC_STM32
+	bool "Enable support for rtc driver"
+	select USE_STM32_HAL_RTC
+	select USE_STM32_HAL_RTC_EX
+	select USE_STM32_HAL_RCC
+	select USE_STM32_HAL_RCC_EX
+	select USE_STM32_LL_RTC
+	select USE_STM32_HAL_PWR
+	select USE_STM32_HAL_PWR_EX
+	select USE_STM32_HAL_CORTEX
+
+	
+# Todo: remove USE_STM32_LL_RCC & USE_STM32_HAL_RCC_EX for the final server