Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/EFR32BG22C224F512GM32/SMU_S/STATUS#0x0
SMULOCK=UNLOCKED
Read to get SMU status.
SMU Lock
0 (UNLOCKED): SMULOCK is Unlocked
1 (LOCKED): SMULOCK is Locked
SMU Programming Error
https://github.com/cmsis-svd/cmsis-svd-data