Broadcom BCM6368 MDIO bus multiplexers

modulename: mdio-mux-bcm6368.ko

configname: CONFIG_MDIO_BUS_MUX_BCM6368

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>MDIO bus device drivers
└─>Device Tree and Open Firmware support
└─>Broadcom BCM6368 MDIO bus multiplexers
In linux kernel since version 5.2 (release Date: 2019-07-07)  
This module provides a driver for MDIO bus multiplexers found in
BCM6368 based Broadcom SoCs. This multiplexer connects one of several
child MDIO bus to a parent bus. Buses could be internal as well as
external and selection logic lies inside the same multiplexer.

source code:
drivers/net/mdio/mdio-mux-bcm6368.c