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
LTC3880, LTC3883, LTC3884, LTC3886, LTC3887, LTC3889, LTC7880,
LTM4644, LTM4675, LTM4676, LTM4677, LTM4678, LTM4680, LTM4686,
and LTM4700.