[linux-next:master 11600/13331] 8250_of.c:undefined reference to `serial8250_get_port'

[linux-next:master 11600/13331] 8250_of.c:undefined reference to `serial8250_get_port'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   176e917e010cb7dcc605f11d2bc33f304292482b
commit: 35fb26f94dfa1b291086b84b2421f957214824d1 [11600/13331] mips: Add EcoNet MIPS platform support
config: mips-randconfig-r053-20250525 (https://download.01.org/0day-ci/archive/20250525/202505251043.vL64Rcd5-lkp@intel.com/config)
compiler: mips-linux-gcc (GCC) 10.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250525/202505251043.vL64Rcd5-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/202505251043.vL64Rcd5-lkp@intel.com/

All errors (new ones prefixed by >>):

   mips-linux-ld: drivers/tty/serial/8250/8250_of.o: in function `of_platform_serial_clk_notifier_cb':
>> 8250_of.c:(.text+0x9c): undefined reference to `serial8250_get_port'
>> mips-linux-ld: 8250_of.c:(.text+0xc4): undefined reference to `serial8250_update_uartclk'
   mips-linux-ld: drivers/tty/serial/8250/8250_of.o: in function `npcm_startup':
>> 8250_of.c:(.text+0x168): undefined reference to `serial8250_do_startup'
   mips-linux-ld: drivers/tty/serial/8250/8250_of.o: in function `of_platform_serial_remove':
>> 8250_of.c:(.text+0x1dc): undefined reference to `serial8250_unregister_port'
   mips-linux-ld: drivers/tty/serial/8250/8250_of.o: in function `of_platform_serial_setup':
>> 8250_of.c:(.text+0x364): undefined reference to `uart_read_and_validate_port_properties'
>> mips-linux-ld: 8250_of.c:(.text+0x4bc): undefined reference to `serial8250_em485_config'
   mips-linux-ld: 8250_of.c:(.text+0x4c8): undefined reference to `serial8250_em485_config'
>> mips-linux-ld: 8250_of.c:(.text+0x4c0): undefined reference to `serial8250_em485_supported'
   mips-linux-ld: 8250_of.c:(.text+0x4d0): undefined reference to `serial8250_em485_supported'
>> mips-linux-ld: 8250_of.c:(.text+0x4e0): undefined reference to `serial8250_em485_start_tx'
   mips-linux-ld: 8250_of.c:(.text+0x4e4): undefined reference to `serial8250_em485_start_tx'
>> mips-linux-ld: 8250_of.c:(.text+0x4ec): undefined reference to `serial8250_em485_stop_tx'
   mips-linux-ld: 8250_of.c:(.text+0x4f0): undefined reference to `serial8250_em485_stop_tx'
   mips-linux-ld: drivers/tty/serial/8250/8250_of.o: in function `of_platform_serial_probe':
>> 8250_of.c:(.text+0x744): undefined reference to `serial8250_register_8250_port'
>> mips-linux-ld: 8250_of.c:(.text+0x7b8): undefined reference to `serial8250_unregister_port'

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for LEDS_EXPRESSWIRE
   Depends on [n]: GPIOLIB [=n] || NEW_LEDS [=y] && GPIOLIB [=n]
   Selected by [m]:
   - BACKLIGHT_KTD2801 [=m] && HAS_IOMEM [=y] && BACKLIGHT_CLASS_DEVICE [=m]
   WARNING: unmet direct dependencies detected for EARLY_PRINTK_8250
   Depends on [n]: EARLY_PRINTK [=n] && USE_GENERIC_EARLY_PRINTK_8250 [=y]
   Selected by [y]:
   - ECONET [=y]
   WARNING: unmet direct dependencies detected for SERIAL_OF_PLATFORM
   Depends on [n]: TTY [=n] && HAS_IOMEM [=y] && SERIAL_8250 [=n] && OF [=y]
   Selected by [y]:
   - ECONET [=y]

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