netdev - Re: [PATCH net-next v2 2/2] net: phy: Add Marvell PHY PTP support

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Message-ID: <20250409180120.61353f37@kmaincent-XPS-13-7390>
Date: Wed, 9 Apr 2025 18:01:20 +0200
From: Kory Maincent <kory.maincent@...tlin.com>
To: "Russell King (Oracle)" <linux@...linux.org.uk>
Cc: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>,
 "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
Subject: Re: [PATCH net-next v2 2/2] net: phy: Add Marvell PHY PTP support

On Wed, 9 Apr 2025 16:34:36 +0100
"Russell King (Oracle)" <linux@...linux.org.uk> wrote:

> On Mon, Apr 07, 2025 at 04:03:01PM +0200, Kory Maincent wrote:
> > From: Russell King <rmk+kernel@...linux.org.uk>
> > 
> > From: Russell King <rmk+kernel@...linux.org.uk>
> > 
> > Add PTP basic support for Marvell 88E151x PHYs. These PHYs support
> > timestamping the egress and ingress of packets, but does not support
> > any packet modification.
> > 
> > The PHYs support hardware pins for providing an external clock for the
> > TAI counter, and a separate pin that can be used for event capture or
> > generation of a trigger (either a pulse or periodic).  This code does
> > not support either of these modes.
> > 
> > The driver takes inspiration from the Marvell 88E6xxx DSA and DP83640
> > drivers.  The hardware is very similar to the implementation found in
> > the 88E6xxx DSA driver, but the access methods are very different,
> > although it may be possible to create a library that both can use
> > along with accessor functions.
> > 
> > Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>
> > 
> > Add support for interruption.
> > Fix L2 PTP encapsulation frame detection.
> > Fix first PTP timestamp being dropped.
> > Fix Kconfig to depends on MARVELL_PHY.
> > Update comments to use kdoc.  
> 
> Would you mind forwarding me the changes you actually made so I can
> integrate them into the version I have (which is structured quite
> differently from - what I assume - is a much older version of my
> patches please?

I don't know how you want this but here is a diff with your first patch sent
mainline:
https://termbin.com/gzei
There is also a small fix in the tai part:
https://termbin.com/6a18

> The PTP IP is re-used not only in Marvell PHY drivers but also their
> DSA drivers, and having it all in drivers/net/phy/ as this version
> has does not make sense.

Ok, didn't know that.

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