default or selected kernelversion does not have config value CONFIG_MEDIATEK_2P5GE_PHY.
Result is shown for kernelversion 6.16-rc7

MediaTek 2.5Gb Ethernet PHYs

modulename: mtk-2p5ge.ko

configname: CONFIG_MEDIATEK_2P5GE_PHY

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>PHY Device support and infrastructure
└─>MediaTek 2.5Gb Ethernet PHYs
In linux kernel since version 6.1.145 (release Date: 2025-07-14)  
Supports MediaTek SoC built-in 2.5Gb Ethernet PHYs.

This will load necessary firmware and add appropriate time delay.
Accelerate this procedure through internal pbus instead of MDIO
bus. Certain link-up issues will also be fixed here.

source code: