Hi Cristian, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on jic23-iio/togreg] [also build test WARNING on next-20220112] [cannot apply to v5.16] [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/Cristian-Pop/dt-bindings-iio-add... base: https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git togreg config: i386-allyesconfig (https://download.01.org/0day-ci/archive/20220113/202201130058.u8Hmc486-lk...) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/0day-ci/linux/commit/d68b55a2493d868d6464f86ba93ff0926... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Cristian-Pop/dt-bindings-iio-addac-one-bit-adc-dac-yaml-documentation/20220111-194908 git checkout d68b55a2493d868d6464f86ba93ff092613cae76 # save the config file to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/gpu/drm/vmwgfx/ drivers/iio/addac/ 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/addac/one-bit-adc-dac.c: In function 'one_bit_adc_dac_set_channel_label': 115 | struct iio_chan_spec *chan; | ^~~~ vim +/chan +115 drivers/iio/addac/one-bit-adc-dac.c 106 107 static int one_bit_adc_dac_set_channel_label(struct iio_dev *indio_dev, 108 struct iio_chan_spec *channels, 109 int num_channels) 110 { 111 struct device *device = indio_dev->dev.parent; 112 struct one_bit_adc_dac_state *st = iio_priv(indio_dev); 113 struct fwnode_handle *fwnode; 114 struct fwnode_handle *child; 116 const char *label; 117 int crt_ch = 0, child_num, i = 0; 118 119 fwnode = dev_fwnode(device); 120 child_num = device_get_child_node_count(device); 121 122 st->labels = devm_kzalloc(device, sizeof(*st->labels) * child_num, GFP_KERNEL); 123 if (!st->labels) 124 return -ENOMEM; 125 126 i = child_num; 127 fwnode_for_each_child_node(fwnode, child) { 128 if (fwnode_property_read_u32(child, "reg", &crt_ch)) 129 continue; 130 131 if (crt_ch >= num_channels) 132 continue; 133 134 if (fwnode_property_read_string(child, "label", &label)) 135 continue; 136 137 chan = &channels[crt_ch]; 138 st->labels[--i] = label; 139 } 140 141 return 0; 142 } 143 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org