Hi Joseph, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on 9d922f5df53844228b9f7c62f2593f4f06c0b69b] url: https://github.com/0day-ci/linux/commits/Joseph-CHAMG/ADD-DM9051-ETHERNET... base: 9d922f5df53844228b9f7c62f2593f4f06c0b69b config: arm64-allyesconfig (https://download.01.org/0day-ci/archive/20220121/202201211736.UtU0eL2j-lk...) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project d4baf3b1322b84816aa623d8e8cb45a49cb68b84) 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 arm64 cross compiling tool for clang build # apt-get install binutils-aarch64-linux-gnu # https://github.com/0day-ci/linux/commit/a6eb8dd02aed17af37a0b38fbcc250fd9... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Joseph-CHAMG/ADD-DM9051-ETHERNET-DRIVER/20220121-121713 git checkout a6eb8dd02aed17af37a0b38fbcc250fd9ed9492d # 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=arm64 SHELL=/bin/bash drivers/net/ethernet/davicom/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): db->mdiobus->phy_mask = ~GENMASK(1, 1); ~ ^~~~~~~~~~~~~~ 1 warning generated. vim +1076 drivers/net/ethernet/davicom/dm9051.c 1062 1063 static int dm9051_mdiobus_register(struct board_info *db) 1064 { 1065 struct spi_device *spi = db->spidev; 1066 int ret; 1067 1068 db->mdiobus = devm_mdiobus_alloc(&spi->dev); 1069 if (!db->mdiobus) 1070 return -ENOMEM; 1071 1072 db->mdiobus->priv = db; 1073 db->mdiobus->read = dm9051_mdiobus_read; 1074 db->mdiobus->write = dm9051_mdiobus_write; 1075 db->mdiobus->name = "dm9051-mdiobus"; 1077 db->mdiobus->parent = &spi->dev; 1078 snprintf(db->mdiobus->id, MII_BUS_ID_SIZE, 1079 "dm9051-%s.%u", dev_name(&spi->dev), spi->chip_select); 1080 1081 ret = devm_mdiobus_register(&spi->dev, db->mdiobus); 1082 if (ret) { 1083 dev_err(&spi->dev, "Could not register MDIO bus\n"); 1084 return ret; 1085 } 1086 return 0; 1087 } 1088 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org