Regulator support for LTC2978 and compatibles

configname: CONFIG_SENSORS_LTC2978_REGULATOR

Linux Kernel Configuration
└─>Device Drivers
└─>Hardware Monitoring support
└─>PMBus support
└─>Regulator support for LTC2978 and compatibles
In linux kernel since version 3.10 (release Date: 2013-06-30)  
If you say yes here you get regulator support for Linear
Technology LTC2974, LTC2977, LTC2978, LTC3880, LTC3883, LTM4676
and LTM4686.