netdev - Re: [PATCH v5 net-next 08/13] net: phy: marvell-88q2xxx: add support for temperature sensor

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Message-ID: <20240201165221.GD48964@debian>
Date: Thu, 1 Feb 2024 17:52:21 +0100
From: Dimitri Fedrau <dima.fedrau@...il.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>,
	Jean Delvare <jdelvare@...e.com>,
	Guenter Roeck <linux@...ck-us.net>,
	Stefan Eichenberger <eichest@...il.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org
Subject: Re: [PATCH v5 net-next 08/13] net: phy: marvell-88q2xxx: add support
 for temperature sensor

Am Thu, Feb 01, 2024 at 02:23:15PM +0100 schrieb Andrew Lunn:
> > Anyway it's wrong. I couldn't find a good solution to use the temperature
> > interrupt. Will have a look into this, and probably figuring out how to
> > do so. But it won't be part of this patch series.
> 
> I don't know of any PHY driver you can follow, those that do have a
> temperature sensor just report the temperature and don't do anything
> in addition.
> 
> You might need to look at thermal zones, and indicate there has been a
> thermal trip point. That could then be used by the thermal subsystem
> to increase cooling via a fan, etc. In theory, you could also make the
> PHY active to thermal pressure, by forcing the link to renegotiate to
> a lower link speed. If you decide to go this route, please try to make
> is generic to any PHY. But its going to be quite a disruptive thing,
> the link will be lost of a little over a second...
> 
Making the PHY active to thermal pressure sounds interesting. Will look
into this.