Re: [PATCH 2/2] iio: adc: ltc2309: add support for ltc2305

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

Hi Kyle,

kernel test robot noticed the following build warnings:

[auto build test WARNING on 9448598b22c50c8a5bb77a9103e2d49f134c9578]

url:    https://github.com/intel-lab-lkp/linux/commits/Kyle-Hsieh/dt-bindings-adc-ltc2497-add-support-for-ltc2305/20251223-171509
base:   9448598b22c50c8a5bb77a9103e2d49f134c9578
patch link:    https://lore.kernel.org/r/20251223-add_ltc2305_driver-v1-2-dfa0827fd620%40gmail.com
patch subject: [PATCH 2/2] iio: adc: ltc2309: add support for ltc2305
config: sparc64-randconfig-001-20251224 (https://download.01.org/0day-ci/archive/20251224/202512240416.ckqhNpHO-lkp@intel.com/config)
compiler: sparc64-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251224/202512240416.ckqhNpHO-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/202512240416.ckqhNpHO-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/iio/adc/ltc2309.c: In function 'ltc2309_probe':
>> drivers/iio/adc/ltc2309.c:195:29: warning: unused variable 'match' [-Wunused-variable]
     const struct of_device_id *match;
                                ^~~~~


vim +/match +195 drivers/iio/adc/ltc2309.c

   192	
   193	static int ltc2309_probe(struct i2c_client *client)
   194	{
 > 195		const struct of_device_id *match;
   196		const struct ltc230x_chip_info *chip_info;
   197		struct iio_dev *indio_dev;
   198		struct ltc2309 *ltc2309;
   199		int ret;
   200	
   201		indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*ltc2309));
   202		if (!indio_dev)
   203			return -ENOMEM;
   204	
   205		ltc2309 = iio_priv(indio_dev);
   206		chip_info = device_get_match_data(&client->dev);
   207		if (!chip_info)
   208			return -EINVAL;
   209	
   210		ltc2309->dev = &indio_dev->dev;
   211		ltc2309->client = client;
   212	
   213		indio_dev->name = chip_info->name;
   214		indio_dev->modes = INDIO_DIRECT_MODE;
   215		indio_dev->channels = chip_info->channels;
   216		indio_dev->num_channels = chip_info->num_channels;
   217		indio_dev->info = &ltc2309_info;
   218	
   219		ret = devm_regulator_get_enable_read_voltage(&client->dev, "vref");
   220		if (ret < 0 && ret != -ENODEV)
   221			return dev_err_probe(ltc2309->dev, ret,
   222					     "failed to get vref voltage\n");
   223	
   224		ltc2309->vref_mv = ret == -ENODEV ? LTC2309_INTERNAL_REF_MV : ret / 1000;
   225	
   226		mutex_init(&ltc2309->lock);
   227	
   228		return devm_iio_device_register(&client->dev, indio_dev);
   229	}
   230	

-- 
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https://github.com/intel/lkp-tests/wiki