Voltage controlled regulators

modulename: vctrl-regulator.ko

configname: CONFIG_REGULATOR_VCTRL

Linux Kernel Configuration
└─>Device Drivers
└─>Voltage and Current Regulator Support
└─>Device Tree and Open Firmware support
└─>Voltage controlled regulators
In linux kernel since version 4.2 (release Date: 2015-08-30)  
This driver provides support for voltage regulators whose output
voltage is controlled by the voltage of another regulator.

source code: