CONFIG_SERIAL_8250_FSL (not configurable)

modulename: 8250_fsl.ko

configname: CONFIG_SERIAL_8250_FSL

Linux Kernel Configuration
└─>Device Drivers
└─>Character devices
└─>Serial drivers
└─>SERIAL_8250_FSL
In linux kernel since version 3.1 (release Date: 2011-10-24)  
source code:
drivers/tty/serial/8250/8250_fsl.c