--- zzzz-none-000/linux-4.19.183/drivers/rtc/Kconfig	2021-03-24 10:07:39.000000000 +0000
+++ bcm63-7530ax-756/linux-4.19.183/drivers/rtc/Kconfig	2023-06-28 08:54:19.000000000 +0000
@@ -1819,4 +1819,11 @@
 	  Goldfish is a code name for the virtual platform developed by Google
 	  for Android emulation.
 
+config RTC_DRV_AVM_REF_CLOCK
+    tristate "RTC Driver for external Clock source (DECT)"
+    depends on RTC_CLASS
+    default n
+    help
+        Clock source for Calibrate RTC device driver
+
 endif # RTC_CLASS