X-Powers AXP20X

modulename: axp20x.ko

configname: CONFIG_MFD_AXP20X

Linux Kernel Configuration
└─>Device Drivers
└─>Multifunction device drivers
└─>X-Powers AXP20X
In linux kernel since version 3.16 (release Date: 2014-08-03)  
If you say Y here you get support for the X-Powers AXP202, AXP209 and
AXP288 power management IC (PMIC).
This driver include only the core APIs. You have to select individual
components like regulators or the PEK (Power Enable Key) under the
corresponding menus.

source code: