Richtek RT5190A PMIC

modulename: rt5190a-regulator.ko

configname: CONFIG_REGULATOR_RT5190A

Linux Kernel Configuration
└─>Device Drivers
└─>Voltage and Current Regulator Support
└─>Richtek RT5190A PMIC
In linux kernel since version 5.2 (release Date: 2019-07-07)  
This adds support for voltage regulator in Richtek RT5190A PMIC.
It integratas 1 channel buck controller, 3 channels high efficiency
buck converters, 1 LDO, mute AC OFF depop function, with the general
I2C control interface.

source code:
drivers/regulator/rt5190a-regulator.c