Hi Luiz,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on net-next/master]

url:    https://github.com/0day-ci/linux/commits/Luiz-Angelo-Daros-de-Luca/dt-bindings-net-dsa-realtek-smi-mark-unsupported-switches/20211218-171506
base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git 7e1c5d7b6926f63d3750a273486a143e50d216ad
config: arm-randconfig-c002-20211219 (https://download.01.org/0day-ci/archive/20211220/202112202212.PeXrGA7n-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 4c9e31a4814592bbda7153833e46728dc7b21100)
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 arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://github.com/0day-ci/linux/commit/4098c967b9f6635090798d9eb031f57ae26ed422
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Luiz-Angelo-Daros-de-Luca/dt-bindings-net-dsa-realtek-smi-mark-unsupported-switches/20211218-171506
        git checkout 4098c967b9f6635090798d9eb031f57ae26ed422
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash drivers/net/dsa/realtek/ kernel/trace/

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 >>):

>> drivers/net/dsa/realtek/realtek-mdio.c:53:5: warning: no previous prototype for function 'realtek_mdio_read_reg' [-Wmissing-prototypes]
   int realtek_mdio_read_reg(struct realtek_priv *priv, u32 addr, u32 *data)
       ^
   drivers/net/dsa/realtek/realtek-mdio.c:53:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int realtek_mdio_read_reg(struct realtek_priv *priv, u32 addr, u32 *data)
   ^
   static 
   1 warning generated.


vim +/realtek_mdio_read_reg +53 drivers/net/dsa/realtek/realtek-mdio.c

    52	
  > 53	int realtek_mdio_read_reg(struct realtek_priv *priv, u32 addr, u32 *data)
    54	{
    55		u32 phy_id = priv->phy_id;
    56		struct mii_bus *bus = priv->bus;
    57	
    58		BUG_ON(in_interrupt());
    59	
    60		mutex_lock(&bus->mdio_lock);
    61		/* Write Start command to register 29 */
    62		bus->write(bus, phy_id, MDC_MDIO_START_REG, MDC_MDIO_START_OP);
    63	
    64		/* Write address control code to register 31 */
    65		bus->write(bus, phy_id, MDC_MDIO_CTRL0_REG, MDC_MDIO_ADDR_OP);
    66	
    67		/* Write Start command to register 29 */
    68		bus->write(bus, phy_id, MDC_MDIO_START_REG, MDC_MDIO_START_OP);
    69	
    70		/* Write address to register 23 */
    71		bus->write(bus, phy_id, MDC_MDIO_ADDRESS_REG, addr);
    72	
    73		/* Write Start command to register 29 */
    74		bus->write(bus, phy_id, MDC_MDIO_START_REG, MDC_MDIO_START_OP);
    75	
    76		/* Write read control code to register 21 */
    77		bus->write(bus, phy_id, MDC_MDIO_CTRL1_REG, MDC_MDIO_READ_OP);
    78	
    79		/* Write Start command to register 29 */
    80		bus->write(bus, phy_id, MDC_MDIO_START_REG, MDC_MDIO_START_OP);
    81	
    82		/* Read data from register 25 */
    83		*data = bus->read(bus, phy_id, MDC_MDIO_DATA_READ_REG);
    84	
    85		mutex_unlock(&bus->mdio_lock);
    86	
    87		return 0;
    88	}
    89	

---
0-DAY CI Kernel Test Service, Intel Corporation
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