X-Powers AXP series PMICs with RSB

modulename: axp20x-rsb.ko

configname: CONFIG_MFD_AXP20X_RSB

Linux Kernel Configuration
└─>Device Drivers
└─>Multifunction device drivers
└─>X-Powers AXP series PMICs with RSB
In linux kernel since version 4.1 (release Date: 2015-06-21)  
If you say Y here you get support for the X-Powers AXP series power
management ICs (PMICs) controlled with RSB.
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: