Maxim MAX8997 EXTCON Support

modulename: extcon-max8997.ko

configname: CONFIG_EXTCON_MAX8997

Linux Kernel Configuration
└─>Device Drivers
└─>External Connector Class (extcon) support
└─>Maxim MAX8997 EXTCON Support
In linux kernel since version 3.1 (release Date: 2011-10-24)  
If you say yes here you get support for the MUIC device of
Maxim MAX8997 PMIC. The MAX8997 MUIC is a USB port accessory
detector and switch.

source code:
selects
CONFIG_IRQ_DOMAIN