Re: [PATCH net-next v3 0/6] net: mdio: add timestamped MDIO writes for PHY gettimex64

[Jakub Kicinski]

On Thu,  5 Nov 2026 12:48:33 +0700 James Clark wrote:
> PTP_SYS_OFFSET_EXTENDED uses gettimex64 to bracket each PHC read with
> system clock reads. Some PHYs have a PTP hardware clock (PHC) that is
> read over MDIO and sometimes multiple MDIO transfers are needed to read
> the clock. This leads to brackets in the tens of microseconds.
> Applications that synchronize the system clock from the PHC typically
> use the midpoint of the bracket as the system time of the PHC reading.
> With multiple transfers, the midpoint of the bracket is typically far
> from the time when the PHC reading actually occurred.

There are some AI nit picks available:
https://netdev-ai.bots.linux.dev/sashiko/#/patchset/20261105054839.2248046-1-jjc@xxxxxxxxxx
But frankly unless someone with time expertise reviews this it is going
nowhere.