[Linuxptp-devel] clock_ppb_read() function

[Dong Zhu]

Hi,

clock_ppb_read()
struct timex tx;
memset(&tx, 0, sizeof(tx));
if (clock_adjtime(clkid, &tx) < 0)
pr_err("failed to read out the clock frequency adjustment: %m");

According to ptp_clock_adjtime() which is implemented in kernel,if we do not assign the
tx.modes = (ADJ_FREQUENCY or ADJ_SETOFFSET) the clock_adjtime will return
-EOPNOTSUPP. means not support by kernel now ? If so what is the role of this function(clock_ppb_read) ?

Thanks a lot ~

[Richard Cochran]

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