Re: [PATCH 3/3] drm/bridge: sii9234: use extcon cable detection logic to detect MHL

[kernel test robot <lkp@intel.com>]

Hi Henrik,

kernel test robot noticed the following build errors:

[auto build test ERROR on ca2a6abdaee43808034cdb218428d2ed85fd3db8]

url:    https://github.com/intel-lab-lkp/linux/commits/Henrik-Grimler/drm-bridge-sii9234-fix-some-typos-in-comments-and-messages/20250721-174814
base:   ca2a6abdaee43808034cdb218428d2ed85fd3db8
patch link:    https://lore.kernel.org/r/20250721-exynos4-sii9234-driver-v1-3-2e47ed02f677%40grimler.se
patch subject: [PATCH 3/3] drm/bridge: sii9234: use extcon cable detection logic to detect MHL
config: arm64-randconfig-002-20250724 (https://download.01.org/0day-ci/archive/20250725/202507250036.RXWSmKW2-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 853c343b45b3e83cc5eeef5a52fc8cc9d8a09252)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250725/202507250036.RXWSmKW2-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202507250036.RXWSmKW2-lkp@intel.com/

All errors (new ones prefixed by >>):

>> ld.lld: error: undefined symbol: extcon_register_notifier
   >>> referenced by sii9234.c:928 (drivers/gpu/drm/bridge/sii9234.c:928)
   >>>               drivers/gpu/drm/bridge/sii9234.o:(sii9234_probe) in archive vmlinux.a
--
>> ld.lld: error: undefined symbol: extcon_unregister_notifier
   >>> referenced by sii9234.c:1009 (drivers/gpu/drm/bridge/sii9234.c:1009)
   >>>               drivers/gpu/drm/bridge/sii9234.o:(sii9234_remove) in archive vmlinux.a

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