Hi Antoine,

I love your patch! Yet something to improve:

[auto build test ERROR on net-next/master]

url:    https://github.com/0day-ci/linux/commits/Antoine-Tenart/net-mscc-PTP-Hardware-Clock-PHC-support/20190707-075931
config: ia64-allmodconfig (attached as .config)
compiler: ia64-linux-gcc (GCC) 7.4.0
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=7.4.0 make.cross ARCH=ia64 

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

All errors (new ones prefixed by >>):

   ERROR: "ia64_delay_loop" [drivers/spi/spi-thunderx.ko] undefined!
   ERROR: "ia64_delay_loop" [drivers/net/phy/mdio-cavium.ko] undefined!
>> ERROR: "ocelot_ptp_gettime64" [drivers/net/ethernet/mscc/ocelot_board.ko] undefined!
>> ERROR: "ocelot_get_hwtimestamp" [drivers/net/ethernet/mscc/ocelot_board.ko] undefined!

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