Re: [PATCH v5 2/2] iio: light: Add support for ltrf216a sensor

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

Hi Shreeya,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on jic23-iio/togreg]
[also build test WARNING on v5.19-rc1]
[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]

url:    https://github.com/intel-lab-lkp/linux/commits/Shreeya-Patel/Add-LTRF216A-Driver/20220608-194016
base:   https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git togreg
config: i386-allyesconfig (https://download.01.org/0day-ci/archive/20220609/202206090943.Zvfv6OBd-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project b92436efcb7813fc481b30f2593a4907568d917a)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/4809a7f42af19c3da77457e1aaf37ddd171fa779
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Shreeya-Patel/Add-LTRF216A-Driver/20220608-194016
        git checkout 4809a7f42af19c3da77457e1aaf37ddd171fa779
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/iio/adc/ drivers/iio/light/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/iio/light/ltrf216a.c:193:5: warning: no previous prototype for function 'ltrf216a_check_for_data' [-Wmissing-prototypes]
   int ltrf216a_check_for_data(struct i2c_client *client)
       ^
   drivers/iio/light/ltrf216a.c:193:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int ltrf216a_check_for_data(struct i2c_client *client)
   ^
   static 
   1 warning generated.


vim +/ltrf216a_check_for_data +193 drivers/iio/light/ltrf216a.c

   192	
 > 193	int ltrf216a_check_for_data(struct i2c_client *client)
   194	{
   195		int ret;
   196	
   197		ret = i2c_smbus_read_byte_data(client, LTRF216A_MAIN_STATUS);
   198		if (ret < 0) {
   199			dev_err(&client->dev, "Failed to read LTRF216A_MAIN_STATUS register: %d\n", ret);
   200			return ret;
   201		}
   202	
   203		return ret;
   204	}
   205	

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