Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/EFR32MG24A120F1536GM48/GPIO_S/PCNT0_S1INROUTE#0x0
S1IN port/pin select
S1IN port select register
S1IN pin select register
https://github.com/cmsis-svd/cmsis-svd-data