$ git bisect bad
278d24047891a1bf4a98128eaa8ecafd019e58c2 is the first bad commit
commit 278d24047891a1bf4a98128eaa8ecafd019e58c2
Author: Luwei Zhou <b45643@freescale.com>
Date:   Fri Oct 10 13:15:30 2014 +0800

    net: fec: ptp: Enable PPS output based on ptp clock

    FEC ptp timer has 4 channel compare/trigger function. It can be used to
    enable pps output.
    The pulse would be ouput high exactly on N second. The pulse ouput high
    on compare event mode is used to produce pulse per second.  The pulse
    width would be one cycle based on ptp timer clock source.Since 31-bit
    ptp hardware timer is used, the timer will wrap more than 2 seconds. We
    need to reload the compare compare event about every 1 second.

    Signed-off-by: Luwei Zhou <b45643@freescale.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>

:040000 040000 a30512322162ecd8dcc203de80935f953fa433fd c3c288f76495c534cdb66b54eb721f94e05b9408 M	drivers