Hi Matthias,

I love your patch! Yet something to improve:

[auto build test ERROR on driver-core/driver-core-testing]
[also build test ERROR on linus/master v5.12 next-20210506]
[cannot apply to usb/usb-testing robh/for-next char-misc/char-misc-testing]
[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/Matthias-Kaehlcke/USB-misc-Add-onboard_usb_hub-driver/20210504-034618
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git 9ccce092fc64d19504fa54de4fd659e279cc92e7
config: parisc-randconfig-c024-20210505 (attached as .config)
compiler: hppa-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/ce77fd553380117a63f633ab2cd2652c22a3ff98
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Matthias-Kaehlcke/USB-misc-Add-onboard_usb_hub-driver/20210504-034618
        git checkout ce77fd553380117a63f633ab2cd2652c22a3ff98
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross W=1 ARCH=parisc 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <redacted>

All errors (new ones prefixed by >>):

   hppa-linux-ld: drivers/usb/host/xhci-plat.o: in function `xhci_plat_probe':

quoted

(.text+0x70c): undefined reference to `of_is_onboard_usb_hub'

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