linux-kernel - Re: [PATCH net-next v1 2/4] net: phy: micrel: lan8841: set default PTP latency values

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Message-ID: <b44a4aee-f76f-4472-9b5c-343a09ed0d33@lunn.ch>
Date: Wed, 17 Apr 2024 22:23:07 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Oleksij Rempel <o.rempel@...gutronix.de>
Cc: Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Jose Abreu <joabreu@...opsys.com>,
	"David S. Miller" <davem@...emloft.net>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Woojung Huh <woojung.huh@...rochip.com>,
	Arun Ramadoss <arun.ramadoss@...rochip.com>,
	Richard Cochran <richardcochran@...il.com>,
	Russell King <linux@...linux.org.uk>, kernel@...gutronix.de,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	UNGLinuxDriver@...rochip.com,
	linux-stm32@...md-mailman.stormreply.com
Subject: Re: [PATCH net-next v1 2/4] net: phy: micrel: lan8841: set default
 PTP latency values

> > What affect does this have on systems which have already applied
> > adjustments in user space to correct for this? Will this cause
> > regressions for such systems?
> 
> Yes.
> 
> > I know Richard has rejected changes like this in the past.
> 
> In this case I would need to extend the ethtool interface. The driver
> should provide recommended values and the user space can optionally
> read them and optionally write them to the HW.

I suggest you go read older messages from Richard. It was a discussion
with Microchip about one of their PHYs.

	Andrew