PB28_AF_UART4_TXD   70 arch/arm/mach-imx/mach-mx21ads.c 	PB28_AF_UART4_TXD,
PB28_AF_UART4_TXD   80 arch/arm/mach-imx/mach-mx27ads.c 	PB28_AF_UART4_TXD,