Ricoh RN5T5618 PMIC

modulename: rn5t618.ko

configname: CONFIG_MFD_RN5T618

Linux Kernel Configuration
└─>Device Drivers
└─>Multifunction device drivers
└─>Ricoh RN5T5618 PMIC
In linux kernel since version 3.10 (release Date: 2013-06-30)  
Say yes here to add support for the Ricoh RN5T618 PMIC. This
driver provides common support for accessing the device,
additional drivers must be enabled in order to use the
functionality of the device.

source code:
drivers/mfd//rn5t618.c


is selected by
CONFIG_RN5T618_WATCHDOG