Hi Gwendal, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on jic23-iio/togreg] [also build test WARNING on v5.16-rc4 next-20211208] [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/Gwendal-Grignou/Expand-Semtech-S... base: https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git togreg config: arm-randconfig-c002-20211208 (https://download.01.org/0day-ci/archive/20211208/202112082214.pv3MKwkH-lk...) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 097a1cb1d5ebb3a0ec4bcaed8ba3ff6a8e33c00a) 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 # install arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # https://github.com/0day-ci/linux/commit/d02716a5c3a619239e594e6ba6af2ec38... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Gwendal-Grignou/Expand-Semtech-SAR-Sensors-support/20211208-084635 git checkout d02716a5c3a619239e594e6ba6af2ec38fd3de3d # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash drivers/iio/proximity/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): int i, ret, pin_idx; ^ 1 warning generated. vim +/ret +166 drivers/iio/proximity/sx9324.c 158 159 static ssize_t sx9324_phase_configuration_show(struct iio_dev *indio_dev, 160 uintptr_t private, 161 const struct iio_chan_spec *chan, 162 char *buf) 163 { 164 struct sx_common_data *data = iio_priv(indio_dev); 165 unsigned int val; 167 size_t len = 0; 168 169 ret = regmap_read(data->regmap, SX9324_REG_AFE_PH0 + chan->channel, &val); 170 171 for (i = 0; i < SX9324_NUM_PINS; i++) { 172 pin_idx = (val & SX9324_REG_AFE_PH0_PIN_MASK(i)) >> (2 * i); 173 len += scnprintf(buf + len, PAGE_SIZE - len, "%s,", 174 sx9324_cs_pin_usage[pin_idx]); 175 } 176 buf[len - 1] = '\n'; 177 return len; 178 } 179 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org