Raspberry Pi 7-inch touchscreen panel ATTINY regulator

modulename: rpi-panel-attiny-regulator.ko

configname: CONFIG_REGULATOR_RASPBERRYPI_TOUCHSCREEN_ATTINY

Linux Kernel Configuration
└─>Device Drivers
└─>Voltage and Current Regulator Support
└─>Raspberry Pi 7-inch touchscreen panel ATTINY regulator
In linux kernel since version 5.1 (release Date: 2019-05-05)  
This driver supports ATTINY regulator on the Raspberry Pi 7-inch
touchscreen unit. The regulator is used to enable power to the
TC358762, display and to control backlight.

source code: