Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/EFR32BG22C224F512GM32/GPIO_S/USART1_ROUTEEN#0x0
USART1 pin enable
CS pin enable control bit
RTS pin enable control bit
RX pin enable control bit
SCLK pin enable control bit
TX pin enable control bit
https://github.com/cmsis-svd/cmsis-svd-data