Hi Miquel, I love your patch! Yet something to improve: [auto build test ERROR on gpio/for-next] [cannot apply to v5.4-rc3 next-20191014] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Miquel-Raynal/gpio-pca953x-Add-M... base: https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio.git for-next config: m68k-allmodconfig (attached as .config) compiler: m68k-linux-gcc (GCC) 7.4.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree GCC_VERSION=7.4.0 make.cross ARCH=m68k If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation