On Wed, 18 Jan 2023 13:33:56 -0800 Jacob Keller wrote:

quoted

The adjtime function supports using hardware to set the clock offset when
the delta was supported by the hardware. When the delta is not supported by
the hardware, the driver handles adjusting the clock. The newly-introduced
adjphase function is similar to the adjtime function, except it guarantees
that a provided clock offset will be used directly by the hardware to
adjust the PTP clock. When the range is not acceptable by the hardware, an
error is returned.

Makes sense. Once you've verified that the delta is within the accepted
range you can just re-use the existing adjtime function.

Seems like we should add a "max_time_adj" to struct ptp_clock_info
and let the core call adjphase if the offset is small enough to fit.
Instead of having all drivers redirect the calls internally.