netdev - Re: [PATCH net-next RFC 0/5] net: phy: Introduce a port representation

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Message-ID: <Z31bC6ymkKBHdYVR@pengutronix.de>
Date: Tue, 7 Jan 2025 17:49:15 +0100
From: Oleksij Rempel <o.rempel@...gutronix.de>
To: Andrew Lunn <andrew@...n.ch>
Cc: Maxime Chevallier <maxime.chevallier@...tlin.com>,
	"Russell King (Oracle)" <linux@...linux.org.uk>,
	Kory Maincent <kory.maincent@...tlin.com>, davem@...emloft.net,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	thomas.petazzoni@...tlin.com, Jakub Kicinski <kuba@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
	linux-arm-kernel@...ts.infradead.org,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Herve Codina <herve.codina@...tlin.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Vladimir Oltean <vladimir.oltean@....com>,
	Marek Behún <kabel@...nel.org>,
	Nicolò Veronese <nicveronese@...il.com>,
	Simon Horman <horms@...nel.org>, mwojtas@...omium.org,
	Antoine Tenart <atenart@...nel.org>
Subject: Re: [PATCH net-next RFC 0/5] net: phy: Introduce a port
 representation

On Tue, Jan 07, 2025 at 05:41:30PM +0100, Oleksij Rempel wrote:
> On Tue, Jan 07, 2025 at 05:22:51PM +0100, Andrew Lunn wrote:
> > >   I have however seen devices that have a 1G PHY connected to a RJ45
> > > port with 2 lanes only, thus limiting the max achievable speed to 100M.
> > > Here, we would explicietly describe the port has having 2 lanes. 
> 
> I can confirm existence of this kind of designs. One industrial real life
> example: a SoC connected to 3 port Gigabit KSZ switch. One port is
> typical RJ45 connector. Other port is RJ11 connector.
> 
> The speed can be reduced by using max-speed property. But i can't
> provide any user usable diagnostic information just by saying pair A or
> B is broken.
> 
> This is one of the reasons why i propose detailed description.

Here is one example:
https://www.balluff.com/de-de/products/BNI004F?gad_source=1&gclid=Cj0KCQiAvvO7BhC-ARIsAGFyToUmOy6VpSZUszHQ9X4tuUlyLdtAZqkk3tKxggF5z7D1pk3CgH5IOvwaAhhUEALw_wcB

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