Hi Douglas,

kernel test robot noticed the following build warnings:

[auto build test WARNING on robh/for-next]
[also build test WARNING on hid/for-next drm-misc/drm-misc-next linus/master v6.4-rc3 next-20230523]
[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/Douglas-Anderson/dt-bindings-HID-i2c-hid-Add-panel-property-to-i2c-hid-backed-panels/20230524-034323
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
patch link:    https://lore.kernel.org/r/20230523122802.5.Ifcc9b0a44895d164788966f9b9511fe094ca8cf9%40changeid
patch subject: [PATCH 5/9] HID: i2c-hid: Rearrange probe() to power things up later
config: m68k-allyesconfig
compiler: m68k-linux-gcc (GCC) 12.1.0
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/intel-lab-lkp/linux/commit/d744f5cbecdd7a7ee141282a5879e9112f22fb22
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Douglas-Anderson/dt-bindings-HID-i2c-hid-Add-panel-property-to-i2c-hid-backed-panels/20230524-034323
        git checkout d744f5cbecdd7a7ee141282a5879e9112f22fb22
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=m68k olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=m68k SHELL=/bin/bash drivers/hid/i2c-hid/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202305240732.R1ZAvBTN-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/hid/i2c-hid/i2c-hid-core.c:956:5: warning: no previous prototype for 'i2c_hid_core_initial_power_up' [-Wmissing-prototypes]
     956 | int i2c_hid_core_initial_power_up(struct i2c_hid *ihid)
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/i2c_hid_core_initial_power_up +956 drivers/hid/i2c-hid/i2c-hid-core.c

   943	
   944	/**
   945	 * i2c_hid_core_initial_power_up() - First time power up of the i2c-hid device.
   946	 * @ihid: The ihid object created during probe.
   947	 *
   948	 * This function is called at probe time.
   949	 *
   950	 * The initial power on is where we do some basic validation that the device
   951	 * exists, where we fetch the HID descriptor, and where we create the actual
   952	 * HID devices.
   953	 *
   954	 * Return: 0 or error code.
   955	 */
 > 956	int i2c_hid_core_initial_power_up(struct i2c_hid *ihid)
   957	{
   958		struct i2c_client *client = ihid->client;
   959		struct hid_device *hid = ihid->hid;
   960		int ret;
   961	
   962		ret = i2c_hid_core_power_up(ihid);
   963		if (ret)
   964			return ret;
   965	
   966		/* Make sure there is something at this address */
   967		ret = i2c_smbus_read_byte(client);
   968		if (ret < 0) {
   969			i2c_hid_dbg(ihid, "nothing at this address: %d\n", ret);
   970			ret = -ENXIO;
   971			goto err;
   972		}
   973	
   974		ret = i2c_hid_fetch_hid_descriptor(ihid);
   975		if (ret < 0) {
   976			dev_err(&client->dev,
   977				"Failed to fetch the HID Descriptor\n");
   978			goto err;
   979		}
   980	
   981		enable_irq(client->irq);
   982	
   983		hid->version = le16_to_cpu(ihid->hdesc.bcdVersion);
   984		hid->vendor = le16_to_cpu(ihid->hdesc.wVendorID);
   985		hid->product = le16_to_cpu(ihid->hdesc.wProductID);
   986	
   987		hid->initial_quirks |= i2c_hid_get_dmi_quirks(hid->vendor,
   988							      hid->product);
   989	
   990		snprintf(hid->name, sizeof(hid->name), "%s %04X:%04X",
   991			 client->name, (u16)hid->vendor, (u16)hid->product);
   992		strscpy(hid->phys, dev_name(&client->dev), sizeof(hid->phys));
   993	
   994		ihid->quirks = i2c_hid_lookup_quirk(hid->vendor, hid->product);
   995	
   996		ret = hid_add_device(hid);
   997		if (ret) {
   998			if (ret != -ENODEV)
   999				hid_err(client, "can't add hid device: %d\n", ret);
  1000			goto err;
  1001		}
  1002	
  1003		return 0;
  1004	
  1005	err:
  1006		i2c_hid_core_power_down(ihid);
  1007		return ret;
  1008	}
  1009	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki