linux-kernel - Re: [PATCH net-next v6 1/2] ptp: introduce PTP_CLOCK_EXTOFF event for the measured external offset

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Date: Thu, 4 Jan 2024 17:49:45 -0800
From: Richard Cochran <richardcochran@...il.com>
To: Min Li <lnimi@...mail.com>
Cc: lee@...nel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	Min Li <min.li.xe@...esas.com>
Subject: Re: [PATCH net-next v6 1/2] ptp: introduce PTP_CLOCK_EXTOFF event
 for the measured external offset

On Thu, Jan 04, 2024 at 12:12:11PM -0500, Min Li wrote:
> From: Min Li <min.li.xe@...esas.com>
> 
> This change is for the PHC devices that can measure the phase offset
> between PHC signal and the external signal, such as the 1PPS signal of
> GNSS. Reporting PTP_CLOCK_EXTOFF to user space will be piggy-backed to
> the existing ptp_extts_event so that application such as ts2phc can
> poll the external offset the same way as extts. Hence, ts2phc can use
> the offset to achieve the alignment between PHC and the external signal
> by the help of either SW or HW filters.
> 
> Signed-off-by: Min Li <min.li.xe@...esas.com>

Acked-by: Richard Cochran <richardcochran@...il.com>