default or selected kernelversion does not have config value CONFIG_SERIAL_BFIN_SPORT.
Result is shown for kernelversion 6.7-rc3

Blackfin SPORT emulate UART

modulename: bfin_sport_uart.ko

configname: CONFIG_SERIAL_BFIN_SPORT

Linux Kernel Configuration
└─>Device Drivers
└─>Character devices
└─>Serial drivers
└─>Blackfin SPORT emulate UART
In linux kernel since version 2.6.26 (release Date: 2008-07-13)  
Enable SPORT emulate UART on Blackfin series.

To compile this driver as a module, choose M here: the
module will be called bfin_sport_uart.

source code: