drivers: rtc: Add support for Xilinx RTC controller

Add driver support for Xilinx RTC controller.

The supported features include:
 - Set and get time using Zephyr time conversion functions.
 - Configuring and handling alarms using interrupt-based callbacks.
 - Querying and updating alarm time and supported alarm fields.
 - Detecting alarm triggers and monitoring pending alarm status.
 - RTC calibration using coarse and fine offset adjustments.

Alarm and calibration features are conditionally compiled using the
CONFIG_RTC_ALARM and CONFIG_RTC_CALIBRATION options.

Signed-off-by: Balanakakamal V <[email protected]>
Signed-off-by: Harini T <[email protected]>

Author: balanakv

drivers/rtc/CMakeLists.txt

@@ -38,5 +38,6 @@ zephyr_library_sources_ifdef(CONFIG_RTC_SILABS_SIWX91X rtc_silabs_siwx91x.c)
 zephyr_library_sources_ifdef(CONFIG_RTC_SMARTBOND rtc_smartbond.c)
 zephyr_library_sources_ifdef(CONFIG_RTC_STM32 rtc_ll_stm32.c)
 zephyr_library_sources_ifdef(CONFIG_RTC_TI_MSPM0 rtc_ti_mspm0.c)
+zephyr_library_sources_ifdef(CONFIG_RTC_XLNX rtc_xlnx.c)
 zephyr_library_sources_ifdef(CONFIG_RTC_XMC4XXX rtc_xmc4xxx.c)
 # zephyr-keep-sorted-stop

drivers/rtc/Kconfig

@@ -70,6 +70,7 @@ source "drivers/rtc/Kconfig.siwx91x"
 source "drivers/rtc/Kconfig.smartbond"
 source "drivers/rtc/Kconfig.stm32"
 source "drivers/rtc/Kconfig.ti_mspm0"
+source "drivers/rtc/Kconfig.xlnx"
 source "drivers/rtc/Kconfig.xmc4xxx"
 # zephyr-keep-sorted-stop
 

drivers/rtc/Kconfig.xlnx

@@ -0,0 +1,8 @@
+# Copyright (c) 2025 Advanced Micro Devices, Inc. (AMD)
+# SPDX-License-Identifier: Apache-2.0
+
+config RTC_XLNX
+	bool "XLNX RTC driver"
+	default y
+	help
+	  Enable the XILINX RTC driver