reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        git remote add atorgue-stm32 https://git.kernel.org/pub/scm/linux/kernel/git/atorgue/stm32.git
        git fetch atorgue-stm32 stm32-next
        git checkout atorgue-stm32/stm32-next
        b4 shazam https://lore.kernel.org/r/20240812120529.3564390-4-christian.bruel@foss.st.com
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-20 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=hexagon olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-20 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash drivers/phy/st/