[linux-next:master 2857/7658] ktd2801-backlight.c:undefined reference to `expresswire_write_u8'

[linux-next:master 2857/7658] ktd2801-backlight.c:undefined reference to `expresswire_write_u8'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   d37e1e4c52bc60578969f391fb81f947c3e83118
commit: 66c76c1cd984c14660453dfa2118014817924375 [2857/7658] backlight: Add Kinetic KTD2801 backlight support
config: arm64-randconfig-r133-20240214 (https://download.01.org/0day-ci/archive/20240216/202402161410.IG9I4odj-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 13.2.0
reproduce: (https://download.01.org/0day-ci/archive/20240216/202402161410.IG9I4odj-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/202402161410.IG9I4odj-lkp@intel.com/

All errors (new ones prefixed by >>):

   aarch64-linux-ld: drivers/video/backlight/ktd2801-backlight.o: in function `ktd2801_update_status':
>> ktd2801-backlight.c:(.text+0xe4): undefined reference to `expresswire_write_u8'
>> ktd2801-backlight.c:(.text+0xe4): relocation truncated to fit: R_AARCH64_CALL26 against undefined symbol `expresswire_write_u8'
>> aarch64-linux-ld: ktd2801-backlight.c:(.text+0x118): undefined reference to `expresswire_power_off'
>> ktd2801-backlight.c:(.text+0x118): relocation truncated to fit: R_AARCH64_CALL26 against undefined symbol `expresswire_power_off'
>> aarch64-linux-ld: ktd2801-backlight.c:(.text+0x16c): undefined reference to `expresswire_enable'
>> ktd2801-backlight.c:(.text+0x16c): relocation truncated to fit: R_AARCH64_CALL26 against undefined symbol `expresswire_enable'

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for LEDS_EXPRESSWIRE
   Depends on [n]: NEW_LEDS [=n] && GPIOLIB [=y]
   Selected by [y]:
   - BACKLIGHT_KTD2801 [=y] && HAS_IOMEM [=y] && BACKLIGHT_CLASS_DEVICE [=y]

-- 
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https://github.com/intel/lkp-tests/wiki