Hi, I love your patch! Perhaps something to improve: [auto build test WARNING on iio/togreg] [also build test WARNING on linux/master linus/master v5.12-rc2 next-20210311] [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/alexandru-tachici-analog-com/iio... base: https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git togreg config: arc-randconfig-r015-20210311 (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 # https://github.com/0day-ci/linux/commit/4634217a2ad675ef3f84048e7abaf355e... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review alexandru-tachici-analog-com/iio-adc-ad7124-allow-more-than-8-channels/20210311-170758 git checkout 4634217a2ad675ef3f84048e7abaf355e05ca781 # 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 warnings (new ones prefixed by >>): drivers/iio/adc/ad7124.c: In function 'ad7124_setup': 810 | unsigned int val, fclk, power_mode; | ^~~ vim +/val +810 drivers/iio/adc/ad7124.c b3af341bbd9662 Stefan Popa 2018-11-13 807 b3af341bbd9662 Stefan Popa 2018-11-13 808 static int ad7124_setup(struct ad7124_state *st) b3af341bbd9662 Stefan Popa 2018-11-13 809 { b3af341bbd9662 Stefan Popa 2018-11-13 @810 unsigned int val, fclk, power_mode; 4634217a2ad675 Alexandru Tachici 2021-03-11 811 int i, ret; b3af341bbd9662 Stefan Popa 2018-11-13 812 b3af341bbd9662 Stefan Popa 2018-11-13 813 fclk = clk_get_rate(st->mclk); b3af341bbd9662 Stefan Popa 2018-11-13 814 if (!fclk) b3af341bbd9662 Stefan Popa 2018-11-13 815 return -EINVAL; b3af341bbd9662 Stefan Popa 2018-11-13 816 b3af341bbd9662 Stefan Popa 2018-11-13 817 /* The power mode changes the master clock frequency */ b3af341bbd9662 Stefan Popa 2018-11-13 818 power_mode = ad7124_find_closest_match(ad7124_master_clk_freq_hz, b3af341bbd9662 Stefan Popa 2018-11-13 819 ARRAY_SIZE(ad7124_master_clk_freq_hz), b3af341bbd9662 Stefan Popa 2018-11-13 820 fclk); b3af341bbd9662 Stefan Popa 2018-11-13 821 if (fclk != ad7124_master_clk_freq_hz[power_mode]) { b3af341bbd9662 Stefan Popa 2018-11-13 822 ret = clk_set_rate(st->mclk, fclk); b3af341bbd9662 Stefan Popa 2018-11-13 823 if (ret) b3af341bbd9662 Stefan Popa 2018-11-13 824 return ret; b3af341bbd9662 Stefan Popa 2018-11-13 825 } b3af341bbd9662 Stefan Popa 2018-11-13 826 b3af341bbd9662 Stefan Popa 2018-11-13 827 /* Set the power mode */ b3af341bbd9662 Stefan Popa 2018-11-13 828 st->adc_control &= ~AD7124_ADC_CTRL_PWR_MSK; b3af341bbd9662 Stefan Popa 2018-11-13 829 st->adc_control |= AD7124_ADC_CTRL_PWR(power_mode); b3af341bbd9662 Stefan Popa 2018-11-13 830 ret = ad_sd_write_reg(&st->sd, AD7124_ADC_CONTROL, 2, st->adc_control); b3af341bbd9662 Stefan Popa 2018-11-13 831 if (ret < 0) b3af341bbd9662 Stefan Popa 2018-11-13 832 return ret; b3af341bbd9662 Stefan Popa 2018-11-13 833 4634217a2ad675 Alexandru Tachici 2021-03-11 834 mutex_init(&st->cfgs_lock); 4634217a2ad675 Alexandru Tachici 2021-03-11 835 INIT_KFIFO(st->live_cfgs_fifo); b3af341bbd9662 Stefan Popa 2018-11-13 836 for (i = 0; i < st->num_channels; i++) { 4634217a2ad675 Alexandru Tachici 2021-03-11 837 val = st->channels[i].ain; b3af341bbd9662 Stefan Popa 2018-11-13 838 4634217a2ad675 Alexandru Tachici 2021-03-11 839 ret = ad7124_init_config_vref(st, &st->channels[i].cfg); b3af341bbd9662 Stefan Popa 2018-11-13 840 if (ret < 0) b3af341bbd9662 Stefan Popa 2018-11-13 841 return ret; b3af341bbd9662 Stefan Popa 2018-11-13 842 b3af341bbd9662 Stefan Popa 2018-11-13 843 /* b3af341bbd9662 Stefan Popa 2018-11-13 844 * 9.38 SPS is the minimum output data rate supported b3af341bbd9662 Stefan Popa 2018-11-13 845 * regardless of the selected power mode. Round it up to 10 and 4634217a2ad675 Alexandru Tachici 2021-03-11 846 * set all channels to this default value. b3af341bbd9662 Stefan Popa 2018-11-13 847 */ 4634217a2ad675 Alexandru Tachici 2021-03-11 848 ad7124_set_channel_odr(st, i, 10); b3af341bbd9662 Stefan Popa 2018-11-13 849 } b3af341bbd9662 Stefan Popa 2018-11-13 850 b3af341bbd9662 Stefan Popa 2018-11-13 851 return ret; b3af341bbd9662 Stefan Popa 2018-11-13 852 } b3af341bbd9662 Stefan Popa 2018-11-13 853 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org