PB31_AF_UART4_RXD   72 arch/arm/mach-imx/mach-mx21ads.c 	PB31_AF_UART4_RXD,
PB31_AF_UART4_RXD   82 arch/arm/mach-imx/mach-mx27ads.c 	PB31_AF_UART4_RXD,