CONFIG_FWNODE_MDIO (not configurable)

modulename: fwnode_mdio.ko

configname: CONFIG_FWNODE_MDIO

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>PHY Device support and infrastructure
└─>FWNODE_MDIO
In linux kernel since version 4.14.326 (release Date: 2023-09-23)  
FWNODE MDIO bus (Ethernet PHY) accessors

source code: