GB_SPI_MODE_CPOL  839 include/linux/greybus/greybus_protocols.h #define GB_SPI_MODE_MODE_2		(GB_SPI_MODE_CPOL | 0)
GB_SPI_MODE_CPOL  840 include/linux/greybus/greybus_protocols.h #define GB_SPI_MODE_MODE_3		(GB_SPI_MODE_CPOL | GB_SPI_MODE_CPHA)