Re: [PATCH 2/2] iio: adc: ads7038: Add driver support for 12bit ADC

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

Hi,

kernel test robot noticed the following build warnings:

[auto build test WARNING on jic23-iio/togreg]
[also build test WARNING on robh/for-next linus/master v6.6-rc4 next-20231004]
[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/werneazc-gmail-com/iio-adc-ads7038-Add-driver-support-for-12bit-ADC/20231004-182531
base:   https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git togreg
patch link:    https://lore.kernel.org/r/20231004102330.3713-2-andre.werner%40systec-electronic.com
patch subject: [PATCH 2/2] iio: adc: ads7038: Add driver support for 12bit ADC
config: csky-allmodconfig (https://download.01.org/0day-ci/archive/20231005/202310050120.yV1We3RG-lkp@intel.com/config)
compiler: csky-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231005/202310050120.yV1We3RG-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/202310050120.yV1We3RG-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/iio/adc/ti-ads7038-core.c:46:5: warning: no previous prototype for 'ads7038_read_raw' [-Wmissing-prototypes]
      46 | int ads7038_read_raw(struct iio_dev *indio_dev,
         |     ^~~~~~~~~~~~~~~~


vim +/ads7038_read_raw +46 drivers/iio/adc/ti-ads7038-core.c

    45	
  > 46	int ads7038_read_raw(struct iio_dev *indio_dev,
    47			     struct iio_chan_spec const *chan,
    48			     int *val, int *val2,
    49			     long mask)
    50	{
    51		unsigned int ret;
    52		struct ads7038_ch_meas_result tmp_val;
    53		struct ads7038_data *const data = (struct ads7038_data *)iio_priv(indio_dev);
    54		struct ads7038_info *const info = (struct ads7038_info *)data->info;
    55	
    56		ret = info->read_channel(indio_dev, chan->channel, &tmp_val);
    57	
    58		if (ret < 0) {
    59			dev_err(&indio_dev->dev, "Read channel returned with error %d", ret);
    60			return ret;
    61		}
    62	
    63		switch (mask) {
    64		case IIO_CHAN_INFO_RAW:
    65			*val = tmp_val.raw;
    66	
    67			ret = IIO_VAL_INT;
    68			break;
    69		case IIO_CHAN_INFO_SCALE:
    70			ret = regulator_get_voltage(data->reg);
    71			if (ret < 0)
    72				break;
    73	
    74			*val = ret / 1000;	/* uV -> mV */
    75			*val2 = (1 << chan->scan_type.realbits) - 1;
    76	
    77			ret = IIO_VAL_FRACTIONAL;
    78			break;
    79		default:
    80			ret = -EINVAL;
    81			break;
    82		}
    83	
    84		return ret;
    85	}
    86	

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