X-Powers AXP series PMICs with I2C

modulename: axp20x-i2c.ko

configname: CONFIG_MFD_AXP20X_I2C

Linux Kernel Configuration
└─>Device Drivers
└─>Multifunction device drivers
└─>X-Powers AXP series PMICs with I2C
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 I2C.
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.

Note on x86 this provides an ACPI OpRegion, so this must be 'y'
(builtin) and not a module, as the OpRegion must be available as
soon as possible. For the same reason the I2C bus driver options
I2C_DESIGNWARE_PLATFORM and I2C_DESIGNWARE_BAYTRAIL must be 'y' too.

source code: