[frank-w-bpi-r2-4.14:7.1-rc 166/166] drivers/phy/mediatek/phy-mtk-xfi-tphy.c:75:6: warning: no previous prototype for function 'mtk_xfi_tphy_valid_ctle'

[kernel test robot <lkp@intel.com>]

tree:   https://github.com/frank-w/BPI-R2-4.14 7.1-rc
head:   c95b3b76f17fc39ff9ed52ee3e3f0bccc707f586
commit: 93d09f4f4b72a6b829135dfad3eac1c1684ccbe6 [166/166] phy: mtk-xfi: add mtk_xfi_tphy_valid_ctle for use in usxgmii driver
config: hexagon-allmodconfig (https://download.01.org/0day-ci/archive/20260623/202606230741.zHCuAWae-lkp@intel.com/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project e19d1f51a2c80b63cd8ca95bcc757b7077112808)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260623/202606230741.zHCuAWae-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202606230741.zHCuAWae-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/phy/mediatek/phy-mtk-xfi-tphy.c:75:6: warning: no previous prototype for function 'mtk_xfi_tphy_valid_ctle' [-Wmissing-prototypes]
      75 | bool mtk_xfi_tphy_valid_ctle(struct phy *phy)
         |      ^
   drivers/phy/mediatek/phy-mtk-xfi-tphy.c:75:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
      75 | bool mtk_xfi_tphy_valid_ctle(struct phy *phy)
         | ^
         | static 
   1 warning generated.


vim +/mtk_xfi_tphy_valid_ctle +75 drivers/phy/mediatek/phy-mtk-xfi-tphy.c

    74	
  > 75	bool mtk_xfi_tphy_valid_ctle(struct phy *phy)
    76	{
    77		struct mtk_xfi_tphy *xfi_tphy = phy_get_drvdata(phy);
    78		unsigned int val, ctle;
    79	
    80		writel(0x00000404, xfi_tphy->base + 0x00);
    81		writel(0x00d600d5, xfi_tphy->base + 0x10);
    82	
    83		val = readl(xfi_tphy->base + 0xd0);
    84	
    85		ctle = FIELD_GET(GENMASK(12, 8), val);
    86		if (ctle > 10)
    87		       return false;
    88	
    89		return true;
    90	}
    91	

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