Re: [PATCH 2/2] iio: bu27034: Add a read only HWARDWAREGAIN

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

Hi Matti,

kernel test robot noticed the following build warnings:

[auto build test WARNING on 1613e604df0cd359cf2a7fbd9be7a0bcfacfabd0]

url:    https://github.com/intel-lab-lkp/linux/commits/Matti-Vaittinen/bu27034-ROHM-BU27034NUC-to-BU27034ANUC/20240610-180426
base:   1613e604df0cd359cf2a7fbd9be7a0bcfacfabd0
patch link:    https://lore.kernel.org/r/5e88c7b7b0389c6c011f15e05e065791f7561cf5.1718013518.git.mazziesaccount%40gmail.com
patch subject: [PATCH 2/2] iio: bu27034: Add a read only HWARDWAREGAIN
config: i386-buildonly-randconfig-004-20240610 (https://download.01.org/0day-ci/archive/20240610/202406102113.7w2Td20S-lkp@intel.com/config)
compiler: clang version 18.1.5 (https://github.com/llvm/llvm-project 617a15a9eac96088ae5e9134248d8236e34b91b1)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240610/202406102113.7w2Td20S-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/202406102113.7w2Td20S-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/iio/light/rohm-bu27034.c:1057:2: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough]
    1057 |         default:
         |         ^
   drivers/iio/light/rohm-bu27034.c:1057:2: note: insert '__attribute__((fallthrough));' to silence this warning
    1057 |         default:
         |         ^
         |         __attribute__((fallthrough)); 
   drivers/iio/light/rohm-bu27034.c:1057:2: note: insert 'break;' to avoid fall-through
    1057 |         default:
         |         ^
         |         break; 
   1 warning generated.

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for REGMAP_SPI
   Depends on [n]: SPI [=n]
   Selected by [y]:
   - AD9739A [=y] && IIO [=y] && (SPI [=n] || COMPILE_TEST [=y])


vim +1057 drivers/iio/light/rohm-bu27034.c

e52afbd61039e2 Matti Vaittinen 2023-03-31  1042  
d47b9b84292706 Matti Vaittinen 2023-06-13  1043  static int bu27034_write_raw_get_fmt(struct iio_dev *indio_dev,
d47b9b84292706 Matti Vaittinen 2023-06-13  1044  				     struct iio_chan_spec const *chan,
d47b9b84292706 Matti Vaittinen 2023-06-13  1045  				     long mask)
d47b9b84292706 Matti Vaittinen 2023-06-13  1046  {
6196c88810e86d Matti Vaittinen 2024-06-10  1047  	struct bu27034_data *data = iio_priv(indio_dev);
d47b9b84292706 Matti Vaittinen 2023-06-13  1048  
d47b9b84292706 Matti Vaittinen 2023-06-13  1049  	switch (mask) {
d47b9b84292706 Matti Vaittinen 2023-06-13  1050  	case IIO_CHAN_INFO_SCALE:
d47b9b84292706 Matti Vaittinen 2023-06-13  1051  		return IIO_VAL_INT_PLUS_NANO;
d47b9b84292706 Matti Vaittinen 2023-06-13  1052  	case IIO_CHAN_INFO_INT_TIME:
d47b9b84292706 Matti Vaittinen 2023-06-13  1053  		return IIO_VAL_INT_PLUS_MICRO;
6196c88810e86d Matti Vaittinen 2024-06-10  1054  	case IIO_CHAN_INFO_HARDWAREGAIN:
6196c88810e86d Matti Vaittinen 2024-06-10  1055  		dev_dbg(data->dev,
6196c88810e86d Matti Vaittinen 2024-06-10  1056  			"HARDWAREGAIN is read-only, use scale to set\n");
d47b9b84292706 Matti Vaittinen 2023-06-13 @1057  	default:
d47b9b84292706 Matti Vaittinen 2023-06-13  1058  		return -EINVAL;
d47b9b84292706 Matti Vaittinen 2023-06-13  1059  	}
d47b9b84292706 Matti Vaittinen 2023-06-13  1060  }
d47b9b84292706 Matti Vaittinen 2023-06-13  1061  

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