Hi Denzeel, thank you for your patches. > + samsung,mode = <USI_V2_UART>; [...] > + samsung,mode = <USI_V2_I2C>; Although these definitions are valid, there are two issues. these will never compile as you have forgotten to include the header file "dt-bindings/soc/samsung,exynos-usi.h". Also USI_V2* definitions are deprecated and you shoulud use USI_MODE* definitions instead. > + fifo-depth = <256> You are missing a semi-colon. (This applies for nodes spi_8, spi_9 and spi_10). Please rectify these errors. Regards, Umer