Hi frank, Thank you for the patch! Yet something to improve: [auto build test ERROR on lee-mfd/for-mfd-next] [also build test ERROR on linux/master linus/master v5.17-rc8 next-20220310] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/frank-zago/mfd-ch341-add-driver-for-the-WCH-CH341-in-I2C-GPIO-mode/20220314-111158 base: https://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd.git for-mfd-next config: mips-allmodconfig (https://download.01.org/0day-ci/archive/20220314/202203142302.5s8nv83m-lkp@xxxxxxxxx/config) compiler: mips-linux-gcc (GCC) 11.2.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://github.com/0day-ci/linux/commit/bba0dbb56cafdad51de5ccb8ab6714d5b14d0782 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review frank-zago/mfd-ch341-add-driver-for-the-WCH-CH341-in-I2C-GPIO-mode/20220314-111158 git checkout bba0dbb56cafdad51de5ccb8ab6714d5b14d0782 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=mips SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All errors (new ones prefixed by >>, old ones prefixed by <<): >> ERROR: modpost: "arizona_request_irq" [sound/soc/codecs/snd-soc-wm5110.ko] undefined! >> ERROR: modpost: "arizona_free_irq" [sound/soc/codecs/snd-soc-wm5110.ko] undefined! >> ERROR: modpost: "arizona_set_irq_wake" [sound/soc/codecs/snd-soc-wm5110.ko] undefined! >> ERROR: modpost: "arizona_request_irq" [sound/soc/codecs/snd-soc-wm5102.ko] undefined! >> ERROR: modpost: "arizona_free_irq" [sound/soc/codecs/snd-soc-wm5102.ko] undefined! >> ERROR: modpost: "arizona_set_irq_wake" [sound/soc/codecs/snd-soc-wm5102.ko] undefined! >> ERROR: modpost: "arizona_request_irq" [sound/soc/codecs/snd-soc-cs47l24.ko] undefined! >> ERROR: modpost: "arizona_free_irq" [sound/soc/codecs/snd-soc-cs47l24.ko] undefined! >> ERROR: modpost: "arizona_set_irq_wake" [sound/soc/codecs/snd-soc-cs47l24.ko] undefined! >> ERROR: modpost: "arizona_request_irq" [sound/soc/codecs/snd-soc-arizona.ko] undefined! WARNING: modpost: suppressed 16 unresolved symbol warnings because there were too many) --- 0-DAY CI Kernel Test Service https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx