linux-kernel - Re: [PATCH net-next v2 0/2] Add Marvell PHY PTP support

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Message-ID: <20250407163118.6a326a98@kmaincent-XPS-13-7390>
Date: Mon, 7 Apr 2025 16:31:18 +0200
From: Kory Maincent <kory.maincent@...tlin.com>
To: Andrew Lunn <andrew@...n.ch>
Cc: Heiner Kallweit <hkallweit1@...il.com>, Russell King
 <linux@...linux.org.uk>, "David S. Miller" <davem@...emloft.net>, Eric
 Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo
 Abeni <pabeni@...hat.com>, Marek Behún <kabel@...nel.org>,
 Richard Cochran <richardcochran@...il.com>, Thomas Petazzoni
 <thomas.petazzoni@...tlin.com>, Maxime Chevallier
 <maxime.chevallier@...tlin.com>, linux-kernel@...r.kernel.org,
 netdev@...r.kernel.org, Russell King <rmk+kernel@...linux.org.uk>
Subject: Re: [PATCH net-next v2 0/2] Add Marvell PHY PTP support

On Mon, 7 Apr 2025 16:08:04 +0200
Andrew Lunn <andrew@...n.ch> wrote:

> On Mon, Apr 07, 2025 at 04:02:59PM +0200, Kory Maincent wrote:
> > Add PTP basic support for Marvell 88E151x PHYs.  
> 
> Russell has repeatedly said this will cause regressions in some setups
> where there are now two PTP implementations, and the wrong one will be
> chosen by default. I would expect some comments in the commit message
> explaining how this has been addressed, so it is clear a regression
> will not happen.

This was fixed by the following patch series which have parts that get merged
along the way to version 21. It adds support to select the hardware PTP
provider and change the default to MAC PTP for newly introduced PHY PTP support
(default_timestamp flag in phy_device struct).
https://lore.kernel.org/netdev/20241212-feature_ptp_netnext-v21-0-2c282a941518@bootlin.com/

I will add the description in v3. I will wait at least one week to let people
review the patch.

Regards,
-- 
Köry Maincent, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com