Hi Bjorn,

I love your patch! Yet something to improve:

[auto build test ERROR on usb/usb-testing]
[also build test ERROR on robh/for-next driver-core/driver-core-testing linus/master v5.16-rc7 next-20211224]
[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/Bjorn-Andersson/typec-mux-Introduce-support-for-multiple-TypeC-muxes/20211228-132045
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
config: arc-randconfig-r043-20211228 (https://download.01.org/0day-ci/archive/20211228/202112282120.JleedcIB-lkp@intel.com/config)
compiler: arceb-elf-gcc (GCC) 11.2.0
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/db0b002b5b2e1055b2df7b430438335a75dc1557
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Bjorn-Andersson/typec-mux-Introduce-support-for-multiple-TypeC-muxes/20211228-132045
        git checkout db0b002b5b2e1055b2df7b430438335a75dc1557
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=arc SHELL=/bin/bash

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 >>):

   arceb-elf-ld: drivers/phy/qualcomm/phy-qcom-qmp.o: in function `qcom_qmp_phy_remove':
>> phy-qcom-qmp.c:(.text+0x37e): undefined reference to `typec_mux_unregister'
>> arceb-elf-ld: phy-qcom-qmp.c:(.text+0x37e): undefined reference to `typec_mux_unregister'
>> arceb-elf-ld: phy-qcom-qmp.c:(.text+0x384): undefined reference to `typec_switch_unregister'
>> arceb-elf-ld: phy-qcom-qmp.c:(.text+0x384): undefined reference to `typec_switch_unregister'
   arceb-elf-ld: drivers/phy/qualcomm/phy-qcom-qmp.o: in function `qcom_qmp_phy_probe':
>> phy-qcom-qmp.c:(.text+0x14bc): undefined reference to `typec_switch_register'
>> arceb-elf-ld: phy-qcom-qmp.c:(.text+0x14bc): undefined reference to `typec_switch_register'
>> arceb-elf-ld: phy-qcom-qmp.c:(.text+0x14e2): undefined reference to `typec_mux_register'
>> arceb-elf-ld: phy-qcom-qmp.c:(.text+0x14e2): undefined reference to `typec_mux_register'
   arceb-elf-ld: phy-qcom-qmp.c:(.text+0x14f6): undefined reference to `typec_switch_unregister'
   arceb-elf-ld: phy-qcom-qmp.c:(.text+0x14f6): undefined reference to `typec_switch_unregister'
   arceb-elf-ld: drivers/phy/qualcomm/phy-qcom-qmp.o: in function `qcom_qmp_phy_typec_switch_set':
>> phy-qcom-qmp.c:(.text+0x18f0): undefined reference to `typec_switch_get_drvdata'
>> arceb-elf-ld: phy-qcom-qmp.c:(.text+0x18f0): undefined reference to `typec_switch_get_drvdata'
   arceb-elf-ld: drivers/phy/qualcomm/phy-qcom-qmp.o: in function `qcom_qmp_phy_typec_mux_set':
>> phy-qcom-qmp.c:(.text+0x1962): undefined reference to `typec_mux_get_drvdata'
>> arceb-elf-ld: phy-qcom-qmp.c:(.text+0x1962): undefined reference to `typec_mux_get_drvdata'

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