Hi "Marek,

Thank you for the patch! Yet something to improve:

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

url:    https://github.com/0day-ci/linux/commits/Marek-Beh-n/Add-support-for-LEDs-on-Marvell-PHYs/20200908-080520
base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git 81365af13a5630673c49bfad9b24cf415e9576f6
config: arm-randconfig-r036-20200909 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 8893d0816ccdf8998d2e21b5430e9d6abe7ef465)
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
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm 

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

All errors (new ones prefixed by >>):

>> ld.lld: error: undefined symbol: devm_led_classdev_register_ext
   >>> referenced by phy_led.c:63 (drivers/net/phy/phy_led.c:63)
   >>> net/phy/phy_led.o:(of_phy_register_leds) in archive drivers/built-in.a

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