config DM_SERIAL bool "Enable Driver Model for serial drivers" depends on DM help If you want to use driver model for serial drivers, say Y. To use legacy serial drivers, say N. config UNIPHIER_SERIAL bool "UniPhier on-chip UART support" depends on ARCH_UNIPHIER && DM_SERIAL help Support for the on-chip UARTs on the Panasonic UniPhier platform.