CONFIG_PHY_TI_GMII_SEL (not configurable)

modulename: phy-gmii-sel.ko

configname: CONFIG_PHY_TI_GMII_SEL

Linux Kernel Configuration
└─>Device Drivers
└─>PHY Subsystem
└─>PHY_TI_GMII_SEL
In linux kernel since version 5 (release Date: 2019-03-03)  
This driver supports configuring of the TI CPSW Port mode depending on
the Ethernet PHY connected to the CPSW Port.

source code:
drivers/phy/ti/phy-gmii-sel.c