Devicetree based probing for 8250 ports

modulename: 8250_of.ko

configname: CONFIG_SERIAL_OF_PLATFORM

Linux Kernel Configuration
└─>Device Drivers
└─>Character devices
└─>Serial drivers
└─>Device Tree and Open Firmware support
└─>Devicetree based probing for 8250 ports
In linux kernel since version 2.6.21.1 (release Date: 2007-04-27)  
This option is used for all 8250 compatible serial ports that
are probed through devicetree, including Open Firmware based
PowerPC systems and embedded systems on architectures using the
flattened device tree format.

source code: