Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/EFR32MG24A120F1536GM48/GPIO_S/PCNT0_S0INROUTE#0x0
S0IN port/pin select
S0IN port select register
S0IN pin select register
https://github.com/cmsis-svd/cmsis-svd-data