National Semiconductors LP3971 PMIC regulator driver

modulename: lp3971.ko

configname: CONFIG_REGULATOR_LP3971

Linux Kernel Configuration
└─>Device Drivers
└─>Voltage and Current Regulator Support
└─>National Semiconductors LP3971 PMIC regulator driver
In linux kernel since version 2.6.31 (release Date: 2009-09-09)  
Say Y here to support the voltage regulators and convertors
on National Semiconductors LP3971 PMIC

source code:
drivers/regulator/lp3971.c