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    Subject[PATCH] ptp: measure the time offset between PHC and system clock
    This patch add a method into testptp.c to measure the time offset
    between phc and system clock through the ioctl PTP_SYS_OFFSET.

    Signed-off-by: Dong Zhu <bluezhudong@gmail.com>
    ---
    Documentation/ptp/testptp.c | 40 ++++++++++++++++++++++++++++++++++++++--
    1 file changed, 38 insertions(+), 2 deletions(-)

    diff --git a/Documentation/ptp/testptp.c b/Documentation/ptp/testptp.c
    index f59ded0..72bb030 100644
    --- a/Documentation/ptp/testptp.c
    +++ b/Documentation/ptp/testptp.c
    @@ -112,6 +112,7 @@ static void usage(char *progname)
    " -f val adjust the ptp clock frequency by 'val' ppb\n"
    " -g get the ptp clock time\n"
    " -h prints this message\n"
    + " -k val measure the time offset between PHC and system clock\n"
    " -p val enable output with a period of 'val' nanoseconds\n"
    " -P val enable or disable (val=1|0) the system clock PPS\n"
    " -s set the ptp clock time from the system time\n"
    @@ -133,8 +134,12 @@ int main(int argc, char *argv[])
    struct itimerspec timeout;
    struct sigevent sigevent;

    + struct ptp_clock_time *pct;
    + struct ptp_sys_offset *sysoff;
    +
    +
    char *progname;
    - int c, cnt, fd;
    + int i, c, cnt, fd;

    char *device = DEVICE;
    clockid_t clkid;
    @@ -144,6 +149,8 @@ int main(int argc, char *argv[])
    int extts = 0;
    int gettime = 0;
    int oneshot = 0;
    + int offset = 0;
    + int n_samples = 0;
    int periodic = 0;
    int perout = -1;
    int pps = -1;
    @@ -151,7 +158,7 @@ int main(int argc, char *argv[])

    progname = strrchr(argv[0], '/');
    progname = progname ? 1+progname : argv[0];
    - while (EOF != (c = getopt(argc, argv, "a:A:cd:e:f:ghp:P:sSt:v"))) {
    + while (EOF != (c = getopt(argc, argv, "a:A:cd:e:f:ghk:p:P:sSt:v"))) {
    switch (c) {
    case 'a':
    oneshot = atoi(optarg);
    @@ -174,6 +181,10 @@ int main(int argc, char *argv[])
    case 'g':
    gettime = 1;
    break;
    + case 'k':
    + offset = 1;
    + n_samples = atoi(optarg);
    + break;
    case 'p':
    perout = atoi(optarg);
    break;
    @@ -376,6 +387,31 @@ int main(int argc, char *argv[])
    }
    }

    + if (offset) {
    + sysoff = calloc(1, sizeof(*sysoff));
    + if (!sysoff) {
    + perror("calloc");
    + return -1;
    + }
    + sysoff->n_samples = n_samples;
    +
    + if (ioctl(fd, PTP_SYS_OFFSET, sysoff))
    + perror("PTP_SYS_OFFSET");
    + else
    + puts("time offset between PHC and
    + system clock request okay");
    +
    + pct = &sysoff->ts[0];
    + for (i = 0; i < sysoff->n_samples; i++, pct++) {
    + printf("system time: %ld.%ld\n", pct->sec, pct->nsec);
    + pct++;
    + printf("phc time: %ld.%ld\n\n", pct->sec, pct->nsec);
    + }
    + printf("system time: %ld.%ld\n", pct->sec, pct->nsec);
    +
    + free(sysoff);
    + }
    +
    close(fd);
    return 0;
    }
    --
    1.7.11.7

    --
    Best Regards,
    Dong Zhu


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