Hi,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on v5.9-rc8 next-20201006]
[cannot apply to xlnx/master]
[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/muhammad-husaini-zulkifli-intel-com/mmc-sdhci-of-arasan-Enable-UHS-1-support-for-Keem-Bay-SOC/20201007-000542
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 7575fdda569b2a2e8be32c1a64ecb05d6f96a500
config: arm-defconfig (attached as .config)
compiler: arm-linux-gnueabi-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/273db2ef816560e1679afac43fd4e0624d5b7816
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review muhammad-husaini-zulkifli-intel-com/mmc-sdhci-of-arasan-Enable-UHS-1-support-for-Keem-Bay-SOC/20201007-000542
        git checkout 273db2ef816560e1679afac43fd4e0624d5b7816
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm 

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

All warnings (new ones prefixed by >>):

   In file included from drivers/mmc/host/sdhci-of-arasan.c:27:
>> include/linux/firmware/intel/keembay_firmware.h:35:5: warning: no previous prototype for 'keembay_sd_voltage_selection' [-Wmissing-prototypes]
      35 | int keembay_sd_voltage_selection(int volt)
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~

vim +/keembay_sd_voltage_selection +35 include/linux/firmware/intel/keembay_firmware.h

    34	
  > 35	int keembay_sd_voltage_selection(int volt)
    36	{
    37		return do_fw_invoke(KEEMBAY_SET_SD_VOLTAGE_FUNC_ID, volt, 0);
    38	}
    39	#else
    40	static inline int keembay_sd_voltage_selection(int volt)
    41	{
    42		return -ENODEV;
    43	}
    44	#endif
    45	

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