Re: [PATCH v0 1/1] iio: Convert IIO_CHAN_SOFT_TIMESTAMP() to be compound literal

From: kernel test robot

Date: Mon May 18 2026 - 13:38:55 EST

Hi Andy,

kernel test robot noticed the following build warnings:

[auto build test WARNING on jic23-iio/togreg]
[also build test WARNING on linus/master v7.1-rc4 next-20260518]
[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#_base_tree_information]

url: https://github.com/intel-lab-lkp/linux/commits/Andy-Shevchenko/iio-Convert-IIO_CHAN_SOFT_TIMESTAMP-to-be-compound-literal/20260518-151541
base: https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git togreg
patch link: https://lore.kernel.org/r/20260518071349.469748-1-andriy.shevchenko%40linux.intel.com
patch subject: [PATCH v0 1/1] iio: Convert IIO_CHAN_SOFT_TIMESTAMP() to be compound literal
config: sparc64-randconfig-r132-20260518 (https://download.01.org/0day-ci/archive/20260519/202605190130.oWitiRzG-lkp@xxxxxxxxx/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project 5bac06718f502014fade905512f1d26d578a18f3)
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260519/202605190130.oWitiRzG-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/202605190130.oWitiRzG-lkp@xxxxxxxxx/

sparse warnings: (new ones prefixed by >>)
>> drivers/iio/adc/max11410.c:807:31: sparse: sparse: cast to non-scalar
>> drivers/iio/adc/max11410.c:807:31: sparse: sparse: cast from non-scalar

vim +807 drivers/iio/adc/max11410.c

a44ef7c4609724e Ibrahim Tilki 2022-10-03 691
a44ef7c4609724e Ibrahim Tilki 2022-10-03 692 static int max11410_parse_channels(struct max11410_state *st,
a44ef7c4609724e Ibrahim Tilki 2022-10-03 693 struct iio_dev *indio_dev)
a44ef7c4609724e Ibrahim Tilki 2022-10-03 694 {
a44ef7c4609724e Ibrahim Tilki 2022-10-03 695 struct iio_chan_spec chanspec = chanspec_template;
a44ef7c4609724e Ibrahim Tilki 2022-10-03 696 struct device *dev = &st->spi_dev->dev;
a44ef7c4609724e Ibrahim Tilki 2022-10-03 697 struct max11410_channel_config *cfg;
a44ef7c4609724e Ibrahim Tilki 2022-10-03 698 struct iio_chan_spec *channels;
a44ef7c4609724e Ibrahim Tilki 2022-10-03 699 u32 reference, sig_path;
a44ef7c4609724e Ibrahim Tilki 2022-10-03 700 const char *node_name;
a44ef7c4609724e Ibrahim Tilki 2022-10-03 701 u32 inputs[2], scale;
a44ef7c4609724e Ibrahim Tilki 2022-10-03 702 unsigned int num_ch;
a44ef7c4609724e Ibrahim Tilki 2022-10-03 703 int chan_idx = 0;
a44ef7c4609724e Ibrahim Tilki 2022-10-03 704 int ret, i;
a44ef7c4609724e Ibrahim Tilki 2022-10-03 705
a44ef7c4609724e Ibrahim Tilki 2022-10-03 706 num_ch = device_get_child_node_count(dev);
a44ef7c4609724e Ibrahim Tilki 2022-10-03 707 if (num_ch == 0)
a44ef7c4609724e Ibrahim Tilki 2022-10-03 708 return dev_err_probe(&indio_dev->dev, -ENODEV,
a44ef7c4609724e Ibrahim Tilki 2022-10-03 709 "FW has no channels defined\n");
a44ef7c4609724e Ibrahim Tilki 2022-10-03 710
a44ef7c4609724e Ibrahim Tilki 2022-10-03 711 /* Reserve space for soft timestamp channel */
a44ef7c4609724e Ibrahim Tilki 2022-10-03 712 num_ch++;
a44ef7c4609724e Ibrahim Tilki 2022-10-03 713 channels = devm_kcalloc(dev, num_ch, sizeof(*channels), GFP_KERNEL);
a44ef7c4609724e Ibrahim Tilki 2022-10-03 714 if (!channels)
a44ef7c4609724e Ibrahim Tilki 2022-10-03 715 return -ENOMEM;
a44ef7c4609724e Ibrahim Tilki 2022-10-03 716
a44ef7c4609724e Ibrahim Tilki 2022-10-03 717 st->channels = devm_kcalloc(dev, num_ch, sizeof(*st->channels),
a44ef7c4609724e Ibrahim Tilki 2022-10-03 718 GFP_KERNEL);
a44ef7c4609724e Ibrahim Tilki 2022-10-03 719 if (!st->channels)
a44ef7c4609724e Ibrahim Tilki 2022-10-03 720 return -ENOMEM;
a44ef7c4609724e Ibrahim Tilki 2022-10-03 721
1693d2a7459183d Jonathan Cameron 2024-02-17 722 device_for_each_child_node_scoped(dev, child) {
a44ef7c4609724e Ibrahim Tilki 2022-10-03 723 node_name = fwnode_get_name(child);
a44ef7c4609724e Ibrahim Tilki 2022-10-03 724 if (fwnode_property_present(child, "diff-channels")) {
a44ef7c4609724e Ibrahim Tilki 2022-10-03 725 ret = fwnode_property_read_u32_array(child,
a44ef7c4609724e Ibrahim Tilki 2022-10-03 726 "diff-channels",
a44ef7c4609724e Ibrahim Tilki 2022-10-03 727 inputs,
a44ef7c4609724e Ibrahim Tilki 2022-10-03 728 ARRAY_SIZE(inputs));
a44ef7c4609724e Ibrahim Tilki 2022-10-03 729
a44ef7c4609724e Ibrahim Tilki 2022-10-03 730 chanspec.differential = 1;
a44ef7c4609724e Ibrahim Tilki 2022-10-03 731 } else {
a44ef7c4609724e Ibrahim Tilki 2022-10-03 732 ret = fwnode_property_read_u32(child, "reg", &inputs[0]);
a44ef7c4609724e Ibrahim Tilki 2022-10-03 733
a44ef7c4609724e Ibrahim Tilki 2022-10-03 734 inputs[1] = 0;
a44ef7c4609724e Ibrahim Tilki 2022-10-03 735 chanspec.differential = 0;
a44ef7c4609724e Ibrahim Tilki 2022-10-03 736 }
1693d2a7459183d Jonathan Cameron 2024-02-17 737 if (ret)
a44ef7c4609724e Ibrahim Tilki 2022-10-03 738 return ret;
a44ef7c4609724e Ibrahim Tilki 2022-10-03 739
a44ef7c4609724e Ibrahim Tilki 2022-10-03 740 if (inputs[0] > MAX11410_CHANNEL_INDEX_MAX ||
1693d2a7459183d Jonathan Cameron 2024-02-17 741 inputs[1] > MAX11410_CHANNEL_INDEX_MAX)
a44ef7c4609724e Ibrahim Tilki 2022-10-03 742 return dev_err_probe(&indio_dev->dev, -EINVAL,
a44ef7c4609724e Ibrahim Tilki 2022-10-03 743 "Invalid channel index for %s, should be less than %d\n",
a44ef7c4609724e Ibrahim Tilki 2022-10-03 744 node_name,
a44ef7c4609724e Ibrahim Tilki 2022-10-03 745 MAX11410_CHANNEL_INDEX_MAX + 1);
a44ef7c4609724e Ibrahim Tilki 2022-10-03 746
a44ef7c4609724e Ibrahim Tilki 2022-10-03 747 cfg = &st->channels[chan_idx];
a44ef7c4609724e Ibrahim Tilki 2022-10-03 748
a44ef7c4609724e Ibrahim Tilki 2022-10-03 749 reference = MAX11410_REFSEL_AVDD_AGND;
a44ef7c4609724e Ibrahim Tilki 2022-10-03 750 fwnode_property_read_u32(child, "adi,reference", &reference);
1693d2a7459183d Jonathan Cameron 2024-02-17 751 if (reference > MAX11410_REFSEL_MAX)
a44ef7c4609724e Ibrahim Tilki 2022-10-03 752 return dev_err_probe(&indio_dev->dev, -EINVAL,
a44ef7c4609724e Ibrahim Tilki 2022-10-03 753 "Invalid adi,reference value for %s, should be less than %d.\n",
a44ef7c4609724e Ibrahim Tilki 2022-10-03 754 node_name, MAX11410_REFSEL_MAX + 1);
a44ef7c4609724e Ibrahim Tilki 2022-10-03 755
a44ef7c4609724e Ibrahim Tilki 2022-10-03 756 if (!max11410_get_vrefp(st, reference) ||
1693d2a7459183d Jonathan Cameron 2024-02-17 757 (!max11410_get_vrefn(st, reference) && reference <= 2))
a44ef7c4609724e Ibrahim Tilki 2022-10-03 758 return dev_err_probe(&indio_dev->dev, -EINVAL,
a44ef7c4609724e Ibrahim Tilki 2022-10-03 759 "Invalid VREF configuration for %s, either specify corresponding VREF regulators or change adi,reference property.\n",
a44ef7c4609724e Ibrahim Tilki 2022-10-03 760 node_name);
a44ef7c4609724e Ibrahim Tilki 2022-10-03 761
a44ef7c4609724e Ibrahim Tilki 2022-10-03 762 sig_path = MAX11410_PGA_SIG_PATH_BUFFERED;
a44ef7c4609724e Ibrahim Tilki 2022-10-03 763 fwnode_property_read_u32(child, "adi,input-mode", &sig_path);
1693d2a7459183d Jonathan Cameron 2024-02-17 764 if (sig_path > MAX11410_SIG_PATH_MAX)
a44ef7c4609724e Ibrahim Tilki 2022-10-03 765 return dev_err_probe(&indio_dev->dev, -EINVAL,
a44ef7c4609724e Ibrahim Tilki 2022-10-03 766 "Invalid adi,input-mode value for %s, should be less than %d.\n",
a44ef7c4609724e Ibrahim Tilki 2022-10-03 767 node_name, MAX11410_SIG_PATH_MAX + 1);
a44ef7c4609724e Ibrahim Tilki 2022-10-03 768
a44ef7c4609724e Ibrahim Tilki 2022-10-03 769 fwnode_property_read_u32(child, "settling-time-us",
a44ef7c4609724e Ibrahim Tilki 2022-10-03 770 &cfg->settling_time_us);
a44ef7c4609724e Ibrahim Tilki 2022-10-03 771 cfg->bipolar = fwnode_property_read_bool(child, "bipolar");
a44ef7c4609724e Ibrahim Tilki 2022-10-03 772 cfg->buffered_vrefp = fwnode_property_read_bool(child, "adi,buffered-vrefp");
a44ef7c4609724e Ibrahim Tilki 2022-10-03 773 cfg->buffered_vrefn = fwnode_property_read_bool(child, "adi,buffered-vrefn");
a44ef7c4609724e Ibrahim Tilki 2022-10-03 774 cfg->refsel = reference;
a44ef7c4609724e Ibrahim Tilki 2022-10-03 775 cfg->sig_path = sig_path;
a44ef7c4609724e Ibrahim Tilki 2022-10-03 776 cfg->gain = 0;
a44ef7c4609724e Ibrahim Tilki 2022-10-03 777
a44ef7c4609724e Ibrahim Tilki 2022-10-03 778 /* Enable scale_available property if input mode is PGA */
a44ef7c4609724e Ibrahim Tilki 2022-10-03 779 if (sig_path == MAX11410_PGA_SIG_PATH_PGA) {
a44ef7c4609724e Ibrahim Tilki 2022-10-03 780 __set_bit(IIO_CHAN_INFO_SCALE,
a44ef7c4609724e Ibrahim Tilki 2022-10-03 781 &chanspec.info_mask_separate_available);
a44ef7c4609724e Ibrahim Tilki 2022-10-03 782 cfg->scale_avail = devm_kcalloc(dev, MAX11410_SCALE_AVAIL_SIZE * 2,
a44ef7c4609724e Ibrahim Tilki 2022-10-03 783 sizeof(*cfg->scale_avail),
a44ef7c4609724e Ibrahim Tilki 2022-10-03 784 GFP_KERNEL);
1693d2a7459183d Jonathan Cameron 2024-02-17 785 if (!cfg->scale_avail)
a44ef7c4609724e Ibrahim Tilki 2022-10-03 786 return -ENOMEM;
a44ef7c4609724e Ibrahim Tilki 2022-10-03 787
a44ef7c4609724e Ibrahim Tilki 2022-10-03 788 scale = max11410_get_scale(st, *cfg);
a44ef7c4609724e Ibrahim Tilki 2022-10-03 789 for (i = 0; i < MAX11410_SCALE_AVAIL_SIZE; i++) {
a44ef7c4609724e Ibrahim Tilki 2022-10-03 790 cfg->scale_avail[2 * i] = scale >> i;
a44ef7c4609724e Ibrahim Tilki 2022-10-03 791 cfg->scale_avail[2 * i + 1] = chanspec.scan_type.realbits;
a44ef7c4609724e Ibrahim Tilki 2022-10-03 792 }
a44ef7c4609724e Ibrahim Tilki 2022-10-03 793 } else {
a44ef7c4609724e Ibrahim Tilki 2022-10-03 794 __clear_bit(IIO_CHAN_INFO_SCALE,
a44ef7c4609724e Ibrahim Tilki 2022-10-03 795 &chanspec.info_mask_separate_available);
a44ef7c4609724e Ibrahim Tilki 2022-10-03 796 }
a44ef7c4609724e Ibrahim Tilki 2022-10-03 797
a44ef7c4609724e Ibrahim Tilki 2022-10-03 798 chanspec.address = chan_idx;
a44ef7c4609724e Ibrahim Tilki 2022-10-03 799 chanspec.scan_index = chan_idx;
a44ef7c4609724e Ibrahim Tilki 2022-10-03 800 chanspec.channel = inputs[0];
a44ef7c4609724e Ibrahim Tilki 2022-10-03 801 chanspec.channel2 = inputs[1];
a44ef7c4609724e Ibrahim Tilki 2022-10-03 802
a44ef7c4609724e Ibrahim Tilki 2022-10-03 803 channels[chan_idx] = chanspec;
a44ef7c4609724e Ibrahim Tilki 2022-10-03 804 chan_idx++;
a44ef7c4609724e Ibrahim Tilki 2022-10-03 805 }
a44ef7c4609724e Ibrahim Tilki 2022-10-03 806
a44ef7c4609724e Ibrahim Tilki 2022-10-03 @807 channels[chan_idx] = (struct iio_chan_spec)IIO_CHAN_SOFT_TIMESTAMP(chan_idx);
a44ef7c4609724e Ibrahim Tilki 2022-10-03 808
a44ef7c4609724e Ibrahim Tilki 2022-10-03 809 indio_dev->num_channels = chan_idx + 1;
a44ef7c4609724e Ibrahim Tilki 2022-10-03 810 indio_dev->channels = channels;
a44ef7c4609724e Ibrahim Tilki 2022-10-03 811
a44ef7c4609724e Ibrahim Tilki 2022-10-03 812 return 0;
a44ef7c4609724e Ibrahim Tilki 2022-10-03 813 }
a44ef7c4609724e Ibrahim Tilki 2022-10-03 814

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