drivers: rtc: add nxp pcf2123 driver

Add driver support for the NXP PCF2123 RTC.

Signed-off-by: Lukas Gunnarsson <[email protected]>

Author: lukkelele

drivers/rtc/CMakeLists.txt

@@ -15,6 +15,7 @@ zephyr_library_sources_ifdef(CONFIG_RTC_DS3231 rtc_ds3231.c)
 zephyr_library_sources_ifdef(CONFIG_USERSPACE rtc_handlers.c)
 zephyr_library_sources_ifdef(CONFIG_RTC_EMUL rtc_emul.c)
 zephyr_library_sources_ifdef(CONFIG_RTC_INFINEON_CAT1 rtc_ifx_cat1.c)
+zephyr_library_sources_ifdef(CONFIG_RTC_PCF2123 rtc_pcf2123.c)
 zephyr_library_sources_ifdef(CONFIG_RTC_PCF8523 rtc_pcf8523.c)
 zephyr_library_sources_ifdef(CONFIG_RTC_PCF8563 rtc_pcf8563.c)
 zephyr_library_sources_ifdef(CONFIG_RTC_MOTOROLA_MC146818 rtc_mc146818.c)

drivers/rtc/Kconfig

@@ -49,6 +49,7 @@ source "drivers/rtc/Kconfig.emul"
 source "drivers/rtc/Kconfig.fake"
 source "drivers/rtc/Kconfig.ifx_cat1"
 source "drivers/rtc/Kconfig.mc146818"
+source "drivers/rtc/Kconfig.pcf2123"
 source "drivers/rtc/Kconfig.pcf8523"
 source "drivers/rtc/Kconfig.pcf8563"
 source "drivers/rtc/Kconfig.rpi_pico"

drivers/rtc/Kconfig.pcf2123

@@ -0,0 +1,10 @@
+# Copyright (c) 2025 Lukas Gunnarsson <[email protected]>
+# SPDX-License-Identifier: Apache-2.0
+
+config RTC_PCF2123
+	bool "NXP PCF2123 Real-Time Clock driver"
+	default y
+	depends on DT_HAS_NXP_PCF2123_ENABLED
+	select SPI
+	help
+	  Enable NXP PCF2123 SPI RTC driver.