Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFR32FG13P/EFR32FG13P231F512GM48/GPIO/ROUTELOC0#0x0
SWVLOC=LOC0
I/O Routing Location Register
I/O Location
0 (LOC0): Location 0
1 (LOC1): Location 1
2 (LOC2): Location 2
3 (LOC3): Location 3
https://github.com/cmsis-svd/cmsis-svd-data