Hi Sander, Thank you for the patch! Yet something to improve: [auto build test ERROR on pavel-linux-leds/for-next] [also build test ERROR on lee-mfd/for-mfd-next pinctrl/devel v5.13-rc1] [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/0day-ci/linux/commits/Sander-Vanheule/RTL8231-GPIO-expander-support/20210511-202618 base: git://git.kernel.org/pub/scm/linux/kernel/git/pavel/linux-leds.git for-next config: h8300-randconfig-r012-20210512 (attached as .config) compiler: h8300-linux-gcc (GCC) 9.3.0 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 # https://github.com/0day-ci/linux/commit/e031cc2da2c2948230bacd1ca56cfe9990e1aefd git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Sander-Vanheule/RTL8231-GPIO-expander-support/20210511-202618 git checkout e031cc2da2c2948230bacd1ca56cfe9990e1aefd # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross W=1 ARCH=h8300 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All errors (new ones prefixed by >>): h8300-linux-ld: drivers/mfd/rtl8231.o: in function `rtl8231_mdio_reg_write': >> rtl8231.c:(.text+0x4f): undefined reference to `mdiobus_write' h8300-linux-ld: drivers/mfd/rtl8231.o: in function `rtl8231_mdio_reg_read': >> rtl8231.c:(.text+0x75): undefined reference to `mdiobus_read' h8300-linux-ld: drivers/mfd/rtl8231.o: in function `mdio_module_init': >> rtl8231.c:(.init.text+0xd): undefined reference to `mdio_driver_register' --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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