netdev - Re: [PATCH net-next v9 08/13] ptp: Add phc source and helpers to register specific PTP clock or get information

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Message-ID: <ZebZpspMCqjLES/W@shell.armlinux.org.uk>
Date: Tue, 5 Mar 2024 08:36:54 +0000
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Kory Maincent <kory.maincent@...tlin.com>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
	Richard Cochran <richardcochran@...il.com>,
	Radu Pirea <radu-nicolae.pirea@....nxp.com>,
	Jay Vosburgh <j.vosburgh@...il.com>,
	Andy Gospodarek <andy@...yhouse.net>,
	Nicolas Ferre <nicolas.ferre@...rochip.com>,
	Claudiu Beznea <claudiu.beznea@...on.dev>,
	Willem de Bruijn <willemdebruijn.kernel@...il.com>,
	Jonathan Corbet <corbet@....net>,
	Horatiu Vultur <horatiu.vultur@...rochip.com>,
	UNGLinuxDriver@...rochip.com, Simon Horman <horms@...nel.org>,
	Vladimir Oltean <vladimir.oltean@....com>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org,
	Maxime Chevallier <maxime.chevallier@...tlin.com>,
	Rahul Rameshbabu <rrameshbabu@...dia.com>
Subject: Re: [PATCH net-next v9 08/13] ptp: Add phc source and helpers to
 register specific PTP clock or get information

On Mon, Mar 04, 2024 at 06:57:34PM -0800, Jakub Kicinski wrote:
> On Mon, 26 Feb 2024 14:39:59 +0100 Kory Maincent wrote:
> > Prepare for future hardware timestamp selection by adding source and
> > corresponding pointers to ptp_clock structure. Additionally, introduce
> > helpers for registering specific phydev or netdev PTP clocks, retrieving
> > PTP clock information such as hwtstamp source or phydev/netdev pointers,
> > and obtaining the ptp_clock structure from the phc index.
> 
> Can we assume there's one PHC per netdev?
> We both store the netdev/phydev info in the ptp clock
> and ptp clock in the netdev. Is there a reason for that?

No. In the case of mvpp2 + marvell PHY, the two PTP implementations are
entirely separate.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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