default or selected kernelversion does not have config value CONFIG_REGULATOR_MAX77838.
Result is shown for kernelversion 6.18-rc3

Maxim 77838 regulator

modulename: max77838-regulator.ko

configname: CONFIG_REGULATOR_MAX77838

Linux Kernel Configuration
└─>Device Drivers
└─>Voltage and Current Regulator Support
└─>Maxim 77838 regulator
This driver controls a Maxim 77838 regulator via I2C bus.
The regulator include 4 LDOs and a BUCK regulator. It's
present on the Samsung Galaxy S7 lineup of smartphones.

source code:
drivers/regulator/max77838-regulator.c