reproduce (this is a W=1 build):
        # https://github.com/morimoto/linux/commit/16a6af0495252539acef07ecc4a9a488738a4b7c
        git remote add morimoto https://github.com/morimoto/linux
        git fetch --no-tags morimoto renesas-bsp/v6.1.111-2024-09-24-x5
        git checkout 16a6af0495252539acef07ecc4a9a488738a4b7c
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 olddefconfig
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/net/phy/