[PATCH v3 2/7] drivers: mfd: Add a driver for iEi WT61P803 PUZZLE MCU

[kernel test robot]

Hi Luka,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on hwmon/hwmon-next]
[also build test WARNING on lee-mfd/for-mfd-next pavel-linux-leds/for-next linus/master v5.9-rc7 next-20200929]
[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/0day-ci/linux/commits/Luka-Kovacic/Add-support-for-the-iEi-Puzzle-M801-board/20200930-094341
base:   https://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging.git hwmon-next
config: openrisc-randconfig-r033-20200930 (attached as .config)
compiler: or1k-linux-gcc (GCC) 9.3.0
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/0day-ci/linux/commit/3f186576324e22bba3e3893d6f3cf3ce91d70da7
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Luka-Kovacic/Add-support-for-the-iEi-Puzzle-M801-board/20200930-094341
        git checkout 3f186576324e22bba3e3893d6f3cf3ce91d70da7
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=openrisc 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp at intel.com>

All warnings (new ones prefixed by >>):

>> drivers/mfd/iei-wt61p803-puzzle.c:309:5: warning: no previous prototype for 'iei_wt61p803_puzzle_buzzer' [-Wmissing-prototypes]
     309 | int iei_wt61p803_puzzle_buzzer(struct iei_wt61p803_puzzle *mcu, bool long_beep)
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~~

vim +/iei_wt61p803_puzzle_buzzer +309 drivers/mfd/iei-wt61p803-puzzle.c

   308	
 > 309	int iei_wt61p803_puzzle_buzzer(struct iei_wt61p803_puzzle *mcu, bool long_beep)
   310	{
   311		unsigned char buzzer_short_cmd[4] = {
   312			IEI_WT61P803_PUZZLE_CMD_HEADER_START,
   313			IEI_WT61P803_PUZZLE_CMD_FUNCTION_SINGLE,
   314			'2'
   315		}; /* Buzzer 0.5 sec */
   316		unsigned char buzzer_long_cmd[4] = {
   317			IEI_WT61P803_PUZZLE_CMD_HEADER_START,
   318			IEI_WT61P803_PUZZLE_CMD_FUNCTION_SINGLE,
   319			'3'
   320		}; /* Buzzer 1.5 sec */
   321		unsigned char *resp_buf = mcu->response_buffer;
   322		size_t reply_size = 0;
   323		int ret;
   324	
   325		mutex_lock(&mcu->lock);
   326		ret = iei_wt61p803_puzzle_write_command(mcu,
   327				long_beep ? buzzer_long_cmd : buzzer_short_cmd, 4,
   328				resp_buf, &reply_size);
   329		if (ret)
   330			goto exit;
   331	
   332		if (reply_size != 3) {
   333			ret = -EIO;
   334			goto exit;
   335		}
   336	
   337		if (!(resp_buf[0] == IEI_WT61P803_PUZZLE_CMD_HEADER_START &&
   338			resp_buf[1] == IEI_WT61P803_PUZZLE_CMD_RESPONSE_OK &&
   339			resp_buf[2] == IEI_WT61P803_PUZZLE_CHECKSUM_RESPONSE_OK)) {
   340			ret = -EPROTO;
   341			goto exit;
   342		}
   343	exit:
   344		mutex_unlock(&mcu->lock);
   345		return ret;
   346	}
   347	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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