reproduce (this is a W=1 build):
        # https://github.com/jsarha/linux/commit/acbc532ef3ae9e8565fee69b7e0b060be42aebdd
        git remote add jsarha https://github.com/jsarha/linux
        git fetch --no-tags jsarha topic/cros-sof-v4.14-rebase
        git checkout acbc532ef3ae9e8565fee69b7e0b060be42aebdd
        # 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/input/touchscreen/