Re: [PATCH v7 4/4] iio: adc: ad4080: add support for AD4880 dual-channel ADC

[kernel test robot <lkp@intel.com>]

Hi Antoniu,

kernel test robot noticed the following build warnings:

[auto build test WARNING on v7.0-rc4]
[also build test WARNING on linus/master]
[cannot apply to jic23-iio/togreg next-20260320]
[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/Antoniu-Miclaus/iio-backend-use-__free-fwnode_handle-for-automatic-cleanup/20260322-200018
base:   v7.0-rc4
patch link:    https://lore.kernel.org/r/20260321100154.1258-5-antoniu.miclaus%40analog.com
patch subject: [PATCH v7 4/4] iio: adc: ad4080: add support for AD4880 dual-channel ADC
config: nios2-allmodconfig (https://download.01.org/0day-ci/archive/20260323/202603231533.tcfdLyO9-lkp@intel.com/config)
compiler: nios2-linux-gcc (GCC) 11.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260323/202603231533.tcfdLyO9-lkp@intel.com/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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202603231533.tcfdLyO9-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/iio/adc/ad4080.c: In function 'ad4080_probe':
   drivers/iio/adc/ad4080.c:738:31: error: implicit declaration of function 'devm_spi_new_ancillary_device'; did you mean 'spi_new_ancillary_device'? [-Werror=implicit-function-declaration]
     738 |                 st->spi[ch] = devm_spi_new_ancillary_device(spi, spi_get_chipselect(spi, ch));
         |                               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
         |                               spi_new_ancillary_device
>> drivers/iio/adc/ad4080.c:738:29: warning: assignment to 'struct spi_device *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
     738 |                 st->spi[ch] = devm_spi_new_ancillary_device(spi, spi_get_chipselect(spi, ch));
         |                             ^
   cc1: some warnings being treated as errors


vim +738 drivers/iio/adc/ad4080.c

   704	
   705	static int ad4080_probe(struct spi_device *spi)
   706	{
   707		struct iio_dev *indio_dev;
   708		struct device *dev = &spi->dev;
   709		struct ad4080_state *st;
   710		struct clk *clk;
   711		int ret;
   712	
   713		indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
   714		if (!indio_dev)
   715			return -ENOMEM;
   716	
   717		st = iio_priv(indio_dev);
   718	
   719		ret = devm_regulator_bulk_get_enable(dev,
   720						     ARRAY_SIZE(ad4080_power_supplies),
   721						     ad4080_power_supplies);
   722		if (ret)
   723			return dev_err_probe(dev, ret,
   724					     "failed to get and enable supplies\n");
   725	
   726		/* Setup primary SPI device (channel 0) */
   727		st->spi[0] = spi;
   728		st->regmap[0] = devm_regmap_init_spi(spi, &ad4080_regmap_config);
   729		if (IS_ERR(st->regmap[0]))
   730			return PTR_ERR(st->regmap[0]);
   731	
   732		st->info = spi_get_device_match_data(spi);
   733		if (!st->info)
   734			return -ENODEV;
   735	
   736		/* Setup ancillary SPI devices for additional channels */
   737		for (unsigned int ch = 1; ch < st->info->num_channels; ch++) {
 > 738			st->spi[ch] = devm_spi_new_ancillary_device(spi, spi_get_chipselect(spi, ch));
   739			if (IS_ERR(st->spi[ch]))
   740				return dev_err_probe(dev, PTR_ERR(st->spi[ch]),
   741						     "failed to register ancillary device\n");
   742	
   743			st->regmap[ch] = devm_regmap_init_spi(st->spi[ch], &ad4080_regmap_config);
   744			if (IS_ERR(st->regmap[ch]))
   745				return PTR_ERR(st->regmap[ch]);
   746		}
   747	
   748		ret = devm_mutex_init(dev, &st->lock);
   749		if (ret)
   750			return ret;
   751	
   752		indio_dev->name = st->info->name;
   753		indio_dev->channels = st->info->channels;
   754		indio_dev->num_channels = st->info->num_channels;
   755		indio_dev->info = st->info->num_channels > 1 ?
   756				  &ad4880_iio_info : &ad4080_iio_info;
   757	
   758		ret = ad4080_properties_parse(st, dev);
   759		if (ret)
   760			return ret;
   761	
   762		clk = devm_clk_get_enabled(&spi->dev, "cnv");
   763		if (IS_ERR(clk))
   764			return PTR_ERR(clk);
   765	
   766		st->clk_rate = clk_get_rate(clk);
   767	
   768		/* Get backends for all channels */
   769		for (unsigned int ch = 0; ch < st->info->num_channels; ch++) {
   770			st->back[ch] = devm_iio_backend_get_by_index(dev, ch);
   771			if (IS_ERR(st->back[ch]))
   772				return PTR_ERR(st->back[ch]);
   773	
   774			ret = devm_iio_backend_enable(dev, st->back[ch]);
   775			if (ret)
   776				return ret;
   777		}
   778	
   779		/*
   780		 * Request buffer from the first backend only. For multi-channel
   781		 * devices (e.g., AD4880), all backends share a single IIO buffer
   782		 * as data from all ADC channels is interleaved into one stream.
   783		 */
   784		ret = devm_iio_backend_request_buffer(dev, st->back[0], indio_dev);
   785		if (ret)
   786			return ret;
   787	
   788		ret = ad4080_setup(indio_dev);
   789		if (ret)
   790			return ret;
   791	
   792		return devm_iio_device_register(&spi->dev, indio_dev);
   793	}
   794	

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