[PATCH v3 2/3] phy: handle optional regulator for PHY

[kernel test robot]

Hi Corentin,

I love your patch! Perhaps something to improve:

[auto build test WARNING on broonie-regulator/for-next]
[also build test WARNING on sunxi/sunxi/for-next linus/master v5.18 next-20220520]
[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/Corentin-Labbe/arm64-add-ethernet-to-orange-pi-3/20220523-133344
base:   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator.git for-next
config: mips-cu1830-neo_defconfig (https://download.01.org/0day-ci/archive/20220523/202205231735.QGDB1Mcy-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 768a1ca5eccb678947f4155e38a5f5744dcefb56)
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
        # install mips cross compiling tool for clang build
        # apt-get install binutils-mips-linux-gnu
        # https://github.com/intel-lab-lkp/linux/commit/7ae2ab7d1efe8091f6b7ea048a7ac495afba9e46
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Corentin-Labbe/arm64-add-ethernet-to-orange-pi-3/20220523-133344
        git checkout 7ae2ab7d1efe8091f6b7ea048a7ac495afba9e46
        # 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=mips SHELL=/bin/bash drivers/net/mdio/

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

All warnings (new ones prefixed by >>):

   In file included from drivers/net/mdio/of_mdio.c:13:
>> include/linux/fwnode_mdio.h:20:5: warning: no previous prototype for function 'fwnode_mdiobus_phy_device_register' [-Wmissing-prototypes]
   int fwnode_mdiobus_phy_device_register(struct mii_bus *mdio,
       ^
   include/linux/fwnode_mdio.h:20:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int fwnode_mdiobus_phy_device_register(struct mii_bus *mdio,
   ^
   static 
   1 warning generated.


vim +/fwnode_mdiobus_phy_device_register +20 include/linux/fwnode_mdio.h

bc1bee3b87ee48b Calvin Johnson 2021-06-11  10  
bc1bee3b87ee48b Calvin Johnson 2021-06-11  11  #if IS_ENABLED(CONFIG_FWNODE_MDIO)
bc1bee3b87ee48b Calvin Johnson 2021-06-11  12  int fwnode_mdiobus_phy_device_register(struct mii_bus *mdio,
bc1bee3b87ee48b Calvin Johnson 2021-06-11  13  				       struct phy_device *phy,
bc1bee3b87ee48b Calvin Johnson 2021-06-11  14  				       struct fwnode_handle *child, u32 addr);
bc1bee3b87ee48b Calvin Johnson 2021-06-11  15  
bc1bee3b87ee48b Calvin Johnson 2021-06-11  16  int fwnode_mdiobus_register_phy(struct mii_bus *bus,
bc1bee3b87ee48b Calvin Johnson 2021-06-11  17  				struct fwnode_handle *child, u32 addr);
bc1bee3b87ee48b Calvin Johnson 2021-06-11  18  
bc1bee3b87ee48b Calvin Johnson 2021-06-11  19  #else /* CONFIG_FWNODE_MDIO */
bc1bee3b87ee48b Calvin Johnson 2021-06-11 @20  int fwnode_mdiobus_phy_device_register(struct mii_bus *mdio,
bc1bee3b87ee48b Calvin Johnson 2021-06-11  21  				       struct phy_device *phy,
bc1bee3b87ee48b Calvin Johnson 2021-06-11  22  				       struct fwnode_handle *child, u32 addr)
bc1bee3b87ee48b Calvin Johnson 2021-06-11  23  {
bc1bee3b87ee48b Calvin Johnson 2021-06-11  24  	return -EINVAL;
bc1bee3b87ee48b Calvin Johnson 2021-06-11  25  }
bc1bee3b87ee48b Calvin Johnson 2021-06-11  26  

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