Hi.

A lot of PTP/PHC drivers set max_adj value quite big. Howover due to kernel's API limit of 32bit long type value (freq) and POSIX frequency conversion it should limited to 32767999 ppb.

It concerns the frequency limit check both for kernel, testptp and ptp4linux servos. Simply 65.536 * 32767999 is almost 2^31... It is also common for adjfreq() vs newer adjfine(). Moreover such big frequency limits seem not practical (phase jump used instead, 1000ppm is huge for any PTP oscillator application), even driver or rather PHC hardware has ability to tune is such range.


best regards
Janusz Uzycki




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