Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series0/EFM32GG/EFM32GG280F512/EBI/POLARITY3#0x0
Polarity Register 3
Chip Select Polarity
Read Enable Polarity
Write Enable Polarity
Address Latch Polarity
ARDY Polarity
BL Polarity
https://github.com/cmsis-svd/cmsis-svd-data