CONFIG_MFD_AXP20X (not configurable)

modulename: axp20x.ko

configname: CONFIG_MFD_AXP20X

Linux Kernel Configuration
└─>Device Drivers
└─>Multifunction device drivers
└─>MFD_AXP20X
In linux kernel since version 3.16 (release Date: 2014-08-03)  
source code:
drivers/mfd//axp20x.c