Register-based I2C multiplexer

modulename: i2c-mux-reg.ko

configname: CONFIG_I2C_MUX_REG

Linux Kernel Configuration
└─>Device Drivers
└─>I2C support
└─>Multiplexer I2C Chip support
└─>Register-based I2C multiplexer
In linux kernel since version 4.1 (release Date: 2015-06-21)  
If you say yes to this option, support will be included for a
register based I2C multiplexer. This driver provides access to
I2C busses connected through a MUX, which is controlled
by a single register.

This driver can also be built as a module. If so, the module
will be called i2c-mux-reg.

source code: