Hi Yangbo,

I love your patch! Yet something to improve:

[auto build test ERROR on net-next/master]
[also build test ERROR on next-20200320]
[cannot apply to linux/master net/master linus/master v5.6-rc6]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Yangbo-Lu/Support-programmable-pins-for-Ocelot-PTP-driver/20200321-004535
base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git 3fd177cb2b47b29d36431229e4737e7286eefa29
config: m68k-allmodconfig (attached as .config)
compiler: m68k-linux-gcc (GCC) 9.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=9.2.0 make.cross ARCH=m68k 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   m68k-linux-ld: drivers/ptp/ptp_ocelot.o: in function `ocelot_ptp_settime64':
   ptp_ocelot.c:(.text+0x38): undefined reference to `__ocelot_read_ix'
>> m68k-linux-ld: ptp_ocelot.c:(.text+0x52): undefined reference to `__ocelot_write_ix'
   m68k-linux-ld: drivers/ptp/ptp_ocelot.o: in function `ocelot_ptp_adjfine':
   ptp_ocelot.c:(.text+0x196): undefined reference to `__ocelot_write_ix'
   m68k-linux-ld: ptp_ocelot.c:(.text+0x1ce): undefined reference to `__ocelot_write_ix'
   m68k-linux-ld: drivers/ptp/ptp_ocelot.o: in function `ocelot_ptp_gettime64':
   ptp_ocelot.c:(.text+0x222): undefined reference to `__ocelot_read_ix'
   m68k-linux-ld: ptp_ocelot.c:(.text+0x240): undefined reference to `__ocelot_write_ix'
   m68k-linux-ld: drivers/ptp/ptp_ocelot.o: in function `ocelot_ptp_adjtime':
   ptp_ocelot.c:(.text+0x34c): undefined reference to `__ocelot_read_ix'
   m68k-linux-ld: ptp_ocelot.c:(.text+0x366): undefined reference to `__ocelot_write_ix'
   m68k-linux-ld: drivers/ptp/ptp_ocelot.o: in function `ocelot_init_timestamp':
   ptp_ocelot.c:(.text+0x4be): undefined reference to `__ocelot_write_ix'

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