Hi Cosmin, I love your patch! Perhaps something to improve: [auto build test WARNING on jic23-iio/togreg] [also build test WARNING on robh/for-next linus/master v5.16-rc5 next-20211217] [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/Cosmin-Tanislav/Add-ADXL367-driver/20211217-194722 base: https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git togreg config: sh-allmodconfig (https://download.01.org/0day-ci/archive/20211218/202112180019.g2mLoEZq-lkp@xxxxxxxxx/config) compiler: sh4-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/c227f49f87d7be7884f44bfdd422713610cdd29c git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Cosmin-Tanislav/Add-ADXL367-driver/20211217-194722 git checkout c227f49f87d7be7884f44bfdd422713610cdd29c # 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=sh SHELL=/bin/bash drivers/iio/accel/ net/netfilter/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> drivers/iio/accel/adxl367.c:990:5: warning: no previous prototype for 'adxl367_write_raw_get_fmt' [-Wmissing-prototypes] 990 | int adxl367_write_raw_get_fmt(struct iio_dev *indio_dev, | ^~~~~~~~~~~~~~~~~~~~~~~~~ drivers/iio/accel/adxl367.c:212:18: warning: 'adxl367_time_scale_tbl' defined but not used [-Wunused-const-variable=] 212 | static const int adxl367_time_scale_tbl[] = { | ^~~~~~~~~~~~~~~~~~~~~~ vim +/adxl367_write_raw_get_fmt +990 drivers/iio/accel/adxl367.c 989 > 990 int adxl367_write_raw_get_fmt(struct iio_dev *indio_dev, 991 struct iio_chan_spec const *chan, 992 long info) 993 { 994 switch (info) { 995 case IIO_CHAN_INFO_SCALE: 996 if (chan->type != IIO_ACCEL) 997 return -EINVAL; 998 999 return IIO_VAL_INT_PLUS_NANO; 1000 default: 1001 return IIO_VAL_INT_PLUS_MICRO; 1002 } 1003 } 1004 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx