Re: [PATCH v2 7/7] iio: adc: ad4170: Add support for weigh scale and RTD sensors

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

Hi Marcelo,

kernel test robot noticed the following build warnings:

[auto build test WARNING on 1c2409fe38d5c19015d69851d15ba543d1911932]

url:    https://github.com/intel-lab-lkp/linux/commits/Marcelo-Schmitt/dt-bindings-iio-adc-Add-AD4170/20250428-222010
base:   1c2409fe38d5c19015d69851d15ba543d1911932
patch link:    https://lore.kernel.org/r/3687a9e0a479aef9736ad557b341ed2e7d4f5756.1745841276.git.marcelo.schmitt%40analog.com
patch subject: [PATCH v2 7/7] iio: adc: ad4170: Add support for weigh scale and RTD sensors
config: powerpc-allmodconfig (https://download.01.org/0day-ci/archive/20250502/202505020345.iJUIBTwt-lkp@intel.com/config)
compiler: powerpc64-linux-gcc (GCC) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250502/202505020345.iJUIBTwt-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/202505020345.iJUIBTwt-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/iio/adc/ad4170.c: In function 'ad4170_setup_current_src.isra':
>> drivers/iio/adc/ad4170.c:1881:29: warning: 'current_src' is used uninitialized [-Wuninitialized]
    1881 |                 current_src |= FIELD_PREP(AD4170_CURRENT_SRC_I_OUT_PIN_MSK, pin);
         |                             ^~
   drivers/iio/adc/ad4170.c:1875:22: note: 'current_src' was declared here
    1875 |         unsigned int current_src, i, j;
         |                      ^~~~~~~~~~~


vim +/current_src +1881 drivers/iio/adc/ad4170.c

  1869	
  1870	static int ad4170_setup_current_src(struct ad4170_state *st,
  1871					    struct fwnode_handle *child,
  1872					    struct ad4170_setup *setup, u32 *exc_pins,
  1873					    int num_exc_pins, int exc_cur, bool ac_excited)
  1874	{
  1875		unsigned int current_src, i, j;
  1876		int ret;
  1877	
  1878		for (i = 0; i < num_exc_pins; i++) {
  1879			unsigned int pin = exc_pins[i];
  1880	
> 1881			current_src |= FIELD_PREP(AD4170_CURRENT_SRC_I_OUT_PIN_MSK, pin);
  1882			current_src |= FIELD_PREP(AD4170_CURRENT_SRC_I_OUT_VAL_MSK, exc_cur);
  1883	
  1884			for (j = 0; j < AD4170_NUM_CURRENT_SRC; j++) {
  1885				/*
  1886				 * Excitation current chopping is configured in pairs.
  1887				 * If current chopping configured and the first end of
  1888				 * the current source pair has already been assigned,
  1889				 * skip to the next pair of output currents.
  1890				 */
  1891				if (ac_excited && j % 2 != 0)
  1892					continue;
  1893	
  1894				if (st->cur_src_pins[j] == AD4170_CURRENT_SRC_DISABLED) {
  1895					st->cur_src_pins[j] = pin;
  1896					break;
  1897				}
  1898			}
  1899			if (j == AD4170_NUM_CURRENT_SRC)
  1900				return dev_err_probe(&st->spi->dev, -EINVAL,
  1901						     "Failed to setup IOUT at pin %u\n",
  1902						     pin);
  1903	
  1904			ret = regmap_write(st->regmap, AD4170_CURRENT_SRC_REG(j),
  1905					   current_src);
  1906			if (ret)
  1907				return ret;
  1908		}
  1909	
  1910		if (ac_excited && num_exc_pins > 1) {
  1911			unsigned int exc_cur_pair;
  1912	
  1913			if (st->cur_src_pins[0] == exc_pins[0])
  1914				exc_cur_pair = 1;
  1915			else
  1916				exc_cur_pair = 2;
  1917	
  1918			/*
  1919			 * Configure excitation currents chopping.
  1920			 * Chop two pairs if using four excitation currents.
  1921			 */
  1922			setup->misc |= FIELD_PREP(AD4170_MISC_CHOP_IEXC_MSK,
  1923						  num_exc_pins == 2 ? exc_cur_pair : 3);
  1924		}
  1925	
  1926		return 0;
  1927	}
  1928	

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