reproduce (this is a W=1 build):
        git checkout 7d0a66e4bb9081d75c82ec4957c50034cb0ea449
        b4 shazam https://lore.kernel.org/r/20251205-upstream_qspi_ospi_updates-v1-3-7e6c8b9f5141@foss.st.com

        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests

        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-8.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=sparc64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-8.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=sparc64 SHELL=/bin/bash drivers/spi/