Hi Krzysztof,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   f40ddce88593482919761f74910f42f4b84c004b
commit: 91687c1926bcd6b80d669375d57331b7bf80bf99 usb: phy: Enable compile testing for some of drivers
date:   1 year, 2 months ago
config: mips-randconfig-r015-20210216 (attached as .config)
compiler: mipsel-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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=91687c1926bcd6b80d669375d57331b7bf80bf99
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 91687c1926bcd6b80d669375d57331b7bf80bf99
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips 

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 >>):

   mipsel-linux-ld: drivers/spi/spi-mt65xx.o: in function `mtk_spi_probe':
   spi-mt65xx.c:(.text+0x59c): undefined reference to `clk_set_parent'
   mipsel-linux-ld: drivers/usb/phy/phy-tegra-usb.o: in function `tegra_usb_phy_probe':
>> phy-tegra-usb.c:(.text+0x510): undefined reference to `clk_get_parent'

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for PHY_DA8XX_USB
   Depends on ARCH_DAVINCI_DA8XX
   Selected by
   - USB_OHCI_HCD_DAVINCI && USB_SUPPORT && USB && (ARCH_DAVINCI_DA8XX || COMPILE_TEST && USB_OHCI_HCD

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