Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFR32MG12P/EFR32MG12P132F512GM68/EMU/DCDCSYNC#0x0
DCDC Read Status Register
DCDC CTRL Register Transfer Busy
https://github.com/cmsis-svd/cmsis-svd-data