Hi Cheng-Yi, Thank you for the patch! Yet something to improve: [auto build test ERROR on asoc/for-next] [also build test ERROR on linux/master linus/master v5.8-rc6 next-20200721] [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/Cheng-Yi-Chiang/Add-documentatio... base: https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next config: arc-allyesconfig (attached as .config) compiler: arc-elf-gcc (GCC) 9.3.0 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 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): 7 | #include <dt-bindings/sound/sc7180-lpass.h> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ compilation terminated. vim +7 sound/soc/qcom/sc7180.c 6 8 #include <linux/module.h> 9 #include <linux/of_device.h> 10 #include <linux/platform_device.h> 11 #include <sound/core.h> 12 #include <sound/jack.h> 13 #include <sound/pcm.h> 14 #include <sound/pcm_params.h> 15 #include <sound/soc.h> 16 #include <uapi/linux/input-event-codes.h> 17 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org