Hi Thomas, kernel test robot noticed the following build warnings: [auto build test WARNING on 5be63fc19fcaa4c236b307420483578a56986a37] url: https://github.com/intel-lab-lkp/linux/commits/Thomas-Bonnefille/dt-bindings-iio-adc-sophgo-cv1800b-saradc-Add-Sophgo-CV1800B-SARADC/20240829-203431 base: 5be63fc19fcaa4c236b307420483578a56986a37 patch link: https://lore.kernel.org/r/20240829-sg2002-adc-v5-2-aacb381e869b%40bootlin.com patch subject: [PATCH v5 2/3] iio: adc: sophgo-saradc: Add driver for Sophgo CV1800B SARADC config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20240831/202408310817.GT3TMpnv-lkp@xxxxxxxxx/config) compiler: clang version 18.1.5 (https://github.com/llvm/llvm-project 617a15a9eac96088ae5e9134248d8236e34b91b1) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240831/202408310817.GT3TMpnv-lkp@xxxxxxxxx/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202408310817.GT3TMpnv-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): >> drivers/iio/adc/sophgo-cv1800b-adc.c:120:3: warning: label followed by a declaration is a C23 extension [-Wc23-extensions] 120 | u32 status_reg = readl(saradc->regs + CV1800B_ADC_CYC_SET_REG); | ^ 1 warning generated. vim +120 drivers/iio/adc/sophgo-cv1800b-adc.c 88 89 static int cv1800b_adc_read_raw(struct iio_dev *indio_dev, 90 struct iio_chan_spec const *chan, 91 int *val, int *val2, long mask) 92 { 93 struct cv1800b_adc *saradc = iio_priv(indio_dev); 94 95 switch (mask) { 96 case IIO_CHAN_INFO_RAW:{ 97 u32 sample; 98 99 scoped_guard(mutex, &saradc->lock) { 100 int ret; 101 102 cv1800b_adc_start_measurement(saradc, chan->scan_index); 103 ret = cv1800b_adc_wait(saradc); 104 if (ret < 0) 105 return ret; 106 107 sample = readl(saradc->regs + CV1800B_ADC_CH_RESULT_REG(chan->scan_index)); 108 } 109 if (!(sample & CV1800B_ADC_CH_VALID)) 110 return -ENODATA; 111 112 *val = sample & CV1800B_ADC_CH_RESULT; 113 return IIO_VAL_INT; 114 } 115 case IIO_CHAN_INFO_SCALE: 116 *val = 3300; 117 *val2 = 12; 118 return IIO_VAL_FRACTIONAL_LOG2; 119 case IIO_CHAN_INFO_SAMP_FREQ: > 120 u32 status_reg = readl(saradc->regs + CV1800B_ADC_CYC_SET_REG); 121 int clk_div = (1 + FIELD_GET(CV1800B_MASK_CLKDIV, status_reg)); 122 int freq = clk_get_rate(saradc->clk) / clk_div; 123 int nb_startup_cycle = 1 + FIELD_GET(CV1800B_MASK_STARTUP_CYCLE, status_reg); 124 int nb_sample_cycle = 1 + FIELD_GET(CV1800B_MASK_SAMPLE_WINDOW, status_reg); 125 int nb_compare_cycle = 1 + FIELD_GET(CV1800B_MASK_COMPARE_CYCLE, status_reg); 126 127 *val = freq / (nb_startup_cycle + nb_sample_cycle + nb_compare_cycle); 128 return IIO_VAL_INT; 129 default: 130 return -EINVAL; 131 } 132 } 133 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki