linux-kernel - Re: [PATCH net-next v2 0/2] ptp: add control over HW timestamp latch point

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Message-ID: <8899c12f-bc2f-49d3-bded-e838ac18fef8@linux.dev>
Date: Tue, 29 Oct 2024 11:30:22 +0000
From: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
To: Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 intel-wired-lan@...ts.osuosl.org
Cc: anthony.l.nguyen@...el.com, przemyslaw.kitszel@...el.com,
 davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
 pabeni@...hat.com, richardcochran@...il.com
Subject: Re: [PATCH net-next v2 0/2] ptp: add control over HW timestamp latch
 point

On 28/10/2024 20:47, Arkadiusz Kubalewski wrote:
> HW support of PTP/timesync solutions in network PHY chips can be
> achieved with two different approaches, the timestamp maybe latched
> either in the beginning or after the Start of Frame Delimiter (SFD) [1].
> 
> Allow ptp device drivers to provide user with control over the timestamp
> latch point.
> 
> [1] https://www.ieee802.org/3/cx/public/april20/tse_3cx_01_0420.pdf

I just wonder should we add ethtool interface to control this feature.
As we are adding it for phy devices, it's good idea to have a way to
control it through eth device too. WDYT?