Re: [PATCH v4 3/6] iio: adc: ad4030: add averaging support

From: kernel test robot
Date: Sat Feb 15 2025 - 14:35:45 EST


Hi Esteban,

kernel test robot noticed the following build errors:

[auto build test ERROR on a64dcfb451e254085a7daee5fe51bf22959d52d3]

url: https://github.com/intel-lab-lkp/linux/commits/Esteban-Blanc/dt-bindings-iio-adc-add-ADI-ad4030-ad4630-and-ad4632/20250214-202727
base: a64dcfb451e254085a7daee5fe51bf22959d52d3
patch link: https://lore.kernel.org/r/20250214-eblanc-ad4630_v1-v4-3-135dd66cab6a%40baylibre.com
patch subject: [PATCH v4 3/6] iio: adc: ad4030: add averaging support
config: hexagon-allyesconfig (https://download.01.org/0day-ci/archive/20250216/202502160351.NQfCUpV9-lkp@xxxxxxxxx/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250216/202502160351.NQfCUpV9-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/202502160351.NQfCUpV9-lkp@xxxxxxxxx/

All errors (new ones prefixed by >>):

>> drivers/iio/adc/ad4030.c:375:13: error: assigning to 'struct iio_scan_type *' from 'const struct iio_scan_type *' discards qualifiers [-Werror,-Wincompatible-pointer-types-discards-qualifiers]
375 | scan_type = iio_get_current_scan_type(indio_dev,
| ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
376 | st->chip->channels);
| ~~~~~~~~~~~~~~~~~~~
1 error generated.


vim +375 drivers/iio/adc/ad4030.c

365
366 static int ad4030_get_chan_scale(struct iio_dev *indio_dev,
367 struct iio_chan_spec const *chan,
368 int *val,
369 int *val2)
370 {
371 struct ad4030_state *st = iio_priv(indio_dev);
372 struct iio_scan_type *scan_type;
373
374 if (chan->differential) {
> 375 scan_type = iio_get_current_scan_type(indio_dev,
376 st->chip->channels);
377 *val = (st->vref_uv * 2) / MILLI;
378 *val2 = scan_type->realbits;
379 return IIO_VAL_FRACTIONAL_LOG2;
380 }
381
382 *val = st->vref_uv / MILLI;
383 *val2 = chan->scan_type.realbits;
384 return IIO_VAL_FRACTIONAL_LOG2;
385 }
386

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