CONFIG_IXP4XX_IRQ (not configurable)

modulename: irq-ixp4xx.ko

configname: CONFIG_IXP4XX_IRQ

Linux Kernel Configuration
└─>Device Drivers
└─>IRQ chip support
└─>IXP4XX_IRQ
In linux kernel since version 5.1 (release Date: 2019-05-05)  
source code:
drivers/irqchip/irq-ixp4xx.c
selects
CONFIG_IRQ_DOMAIN
CONFIG_SPARSE_IRQ

is depended by
CONFIG_ARCH_IXP4XX