Re: [PATCH v4 02/11] iio: adc: Add basic support for AD4170

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

Hi Marcelo,

kernel test robot noticed the following build warnings:

[auto build test WARNING on c06335516e8c14f501a479a4d9de0e6c09c52ef2]

url:    https://github.com/intel-lab-lkp/linux/commits/Marcelo-Schmitt/dt-bindings-iio-adc-Add-AD4170/20250603-105744
base:   c06335516e8c14f501a479a4d9de0e6c09c52ef2
patch link:    https://lore.kernel.org/r/e79f9a126672b33b8a7c01f650fee43a68c74029.1748829860.git.marcelo.schmitt%40analog.com
patch subject: [PATCH v4 02/11] iio: adc: Add basic support for AD4170
config: m68k-allmodconfig (https://download.01.org/0day-ci/archive/20250603/202506032131.wuzW0a3k-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 15.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250603/202506032131.wuzW0a3k-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/202506032131.wuzW0a3k-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/iio/adc/ad4170.c: In function 'ad4170_parse_reference':
>> drivers/iio/adc/ad4170.c:1130:13: warning: variable 'ret' set but not used [-Wunused-but-set-variable]
    1130 |         int ret;
         |             ^~~


vim +/ret +1130 drivers/iio/adc/ad4170.c

  1124	
  1125	static int ad4170_parse_reference(struct ad4170_state *st,
  1126					  struct fwnode_handle *child,
  1127					  struct ad4170_setup *setup)
  1128	{
  1129		struct device *dev = &st->spi->dev;
> 1130		int ret;
  1131		u32 aux;
  1132	
  1133		/* Optional positive reference buffering */
  1134		aux = AD4170_REF_BUF_FULL; /* Default to full precharge buffer enabled. */
  1135		fwnode_property_read_u32(child, "adi,positive-reference-buffer", &aux);
  1136		if (aux < AD4170_REF_BUF_PRE || aux > AD4170_REF_BUF_BYPASS)
  1137			return dev_err_probe(dev, -EINVAL,
  1138					     "Invalid adi,positive-reference-buffer: %u\n",
  1139					     aux);
  1140	
  1141		setup->afe |= FIELD_PREP(AD4170_AFE_REF_BUF_P_MSK, aux);
  1142	
  1143		/* Optional negative reference buffering */
  1144		aux = AD4170_REF_BUF_FULL; /* Default to full precharge buffer enabled. */
  1145		fwnode_property_read_u32(child, "adi,negative-reference-buffer", &aux);
  1146		if (aux < AD4170_REF_BUF_PRE || aux > AD4170_REF_BUF_BYPASS)
  1147			return dev_err_probe(dev, -EINVAL,
  1148					     "Invalid adi,negative-reference-buffer: %u\n",
  1149					     aux);
  1150	
  1151		setup->afe |= FIELD_PREP(AD4170_AFE_REF_BUF_M_MSK, aux);
  1152	
  1153		/* Optional voltage reference selection */
  1154		aux = AD4170_REF_REFOUT; /* Default reference selection. */
  1155		ret = fwnode_property_read_u32(child, "adi,reference-select", &aux);
  1156		if (aux > AD4170_REF_AVDD)
  1157			return dev_err_probe(dev, -EINVAL,
  1158					     "Invalid reference selected %u\n",
  1159					     aux);
  1160	
  1161		setup->afe |= FIELD_PREP(AD4170_AFE_REF_SELECT_MSK, aux);
  1162	
  1163		return 0;
  1164	}
  1165	

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