Interrupt controller support for PCA953x

configname: CONFIG_GPIO_PCA953X_IRQ

Linux Kernel Configuration
└─>Device Drivers
└─>GPIO Support
└─>Interrupt controller support for PCA953x
In linux kernel since version 2.6.34 (release Date: 2010-05-16)  
Say yes here to enable the pca953x to be used as an interrupt
controller. It requires the driver to be built in the kernel.