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Date: Mon, 13 Nov 2023 15:00:15 -0800
From: Jacob Keller <>
To: Min Li <>, <>
CC: <>, <>, Min Li
Subject: Re: [PATCH net-next RFC 1/1] ptp: use extts interface for the
 measured external offset

On 11/13/2023 1:50 PM, Min Li wrote:
> From: Min Li <>
> This change is for the PHC devices that can measure the
> phase offset between PHC signal and the external signal, such
> as GNSS. With this change, ts2phc can use the existing extts
> interface to retrieve measurement offset so that the alignment
> between PHC and the external signal can be achieved.
> Signed-off-by: Min Li <>
> ---

Ok, so this adds a new event type "extoff" which is for eternal
timestamp offset, and it allows reporting the offset instead of the raw

Userspace can request this feature via the new PTP_EXT_OFFSET flag, and
drivers will report it as a new event type.

You mention GNSS, but is there an example or a link to a driver change
you could provide to show its use?

I think the concept seems reasonable and the code seems correct.


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