CONFIG_SAMSUNG_IRQ_UART is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_SAMSUNG_IRQ_UART.
Result is shown for kernelversion 6.2.5

CONFIG_SAMSUNG_IRQ_UART (not configurable)

modulename: irq-uart.ko

configname: CONFIG_SAMSUNG_IRQ_UART

Linux Kernel Configuration
└─>SAMSUNG_IRQ_UART
In linux kernel since version 2.6.34 (release Date: 2010-05-16)  
Internal configuration to build the IRQ UART demux code.

source code:

is depended by
CONFIG_ARCH_S3C64XX