reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/soc/soc.git/commit/?id=158b19afd623da6a93d8ac59dd4aeefe48fa2085
        git remote add soc https://git.kernel.org/pub/scm/linux/kernel/git/soc/soc.git
        git fetch --no-tags soc board-remove
        git checkout 158b19afd623da6a93d8ac59dd4aeefe48fa2085

        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 olddefconfig
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/i2c/busses/ drivers/regulator/