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From: Andrew Lunn <andrew@lunn.ch>
To: Russell King - ARM Linux admin <linux@armlinux.org.uk>
Cc: Florian Fainelli <f.fainelli@gmail.com>,
	netdev@vger.kernel.org, Antoine Tenart <atenart@kernel.org>,
	Vivien Didelot <vivien.didelot@gmail.com>,
	Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
	Maxime Chevallier <maxime.chevallier@bootlin.com>,
	Tobias Waldekranz <tobias@waldekranz.com>,
	"David S. Miller" <davem@davemloft.net>,
	linux-arm-kernel@lists.infradead.org,
	Heiner Kallweit <hkallweit1@gmail.com>
Subject: Re: net: phy: Dealing with 88e1543 dual-port mode
Date: Fri, 20 Nov 2020 14:55:17 +0100	[thread overview]
Message-ID: <20201120135517.GH1804098@lunn.ch> (raw)
In-Reply-To: <20201120102538.GP1551@shell.armlinux.org.uk>

On Fri, Nov 20, 2020 at 10:25:38AM +0000, Russell King - ARM Linux admin wrote:
> On Fri, Nov 20, 2020 at 10:36:01AM +0100, Maxime Chevallier wrote:
> > So maybe we could be a bit more generic, with something along these lines :
> > 
> >     ethernet-phy@0 {
> >         ...
> > 
> >         mdi {
> >             port@0 {
> >                 media = "10baseT", "100baseT", "1000baseT";
> >                 pairs = <1>;
> > 	    };
> > 
> >             port@1 {
> >                 media = "1000baseX", "10gbaseR"
> >             };
> >         };
> >     };
> 
> Don't forget that TP requires a minimum of two pairs.

Hi Russell

Well, actually, there are automotive PHYs which use just one pair, so
called T1 PHYs. We have drivers for i think two so far, with one more
on the way.

You also have to watch out for 'clever' PHYs. The Aquantia PHY can do
1000Base-T2, i.e. 1G over two pairs. This might be a proprietary
extension, rather than standardized, but it shows it can be done. So
you have to be careful about assumptions based on the number of pairs.

    Andrew

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http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

WARNING: multiple messages have this Message-ID (diff)
From: Andrew Lunn <andrew@lunn.ch>
To: Russell King - ARM Linux admin <linux@armlinux.org.uk>
Cc: Maxime Chevallier <maxime.chevallier@bootlin.com>,
	Tobias Waldekranz <tobias@waldekranz.com>,
	Vivien Didelot <vivien.didelot@gmail.com>,
	Florian Fainelli <f.fainelli@gmail.com>,
	Heiner Kallweit <hkallweit1@gmail.com>,
	"David S. Miller" <davem@davemloft.net>,
	Antoine Tenart <atenart@kernel.org>,
	Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
	netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Subject: Re: net: phy: Dealing with 88e1543 dual-port mode
Date: Fri, 20 Nov 2020 14:55:17 +0100	[thread overview]
Message-ID: <20201120135517.GH1804098@lunn.ch> (raw)
In-Reply-To: <20201120102538.GP1551@shell.armlinux.org.uk>

On Fri, Nov 20, 2020 at 10:25:38AM +0000, Russell King - ARM Linux admin wrote:
> On Fri, Nov 20, 2020 at 10:36:01AM +0100, Maxime Chevallier wrote:
> > So maybe we could be a bit more generic, with something along these lines :
> > 
> >     ethernet-phy@0 {
> >         ...
> > 
> >         mdi {
> >             port@0 {
> >                 media = "10baseT", "100baseT", "1000baseT";
> >                 pairs = <1>;
> > 	    };
> > 
> >             port@1 {
> >                 media = "1000baseX", "10gbaseR"
> >             };
> >         };
> >     };
> 
> Don't forget that TP requires a minimum of two pairs.

Hi Russell

Well, actually, there are automotive PHYs which use just one pair, so
called T1 PHYs. We have drivers for i think two so far, with one more
on the way.

You also have to watch out for 'clever' PHYs. The Aquantia PHY can do
1000Base-T2, i.e. 1G over two pairs. This might be a proprietary
extension, rather than standardized, but it shows it can be done. So
you have to be careful about assumptions based on the number of pairs.

    Andrew

  parent reply	other threads:[~2020-11-20 13:56 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-19 14:22 net: phy: Dealing with 88e1543 dual-port mode Maxime Chevallier
2020-11-19 14:22 ` Maxime Chevallier
2020-11-19 14:55 ` Russell King - ARM Linux admin
2020-11-19 14:55   ` Russell King - ARM Linux admin
2020-11-19 15:19   ` Russell King - ARM Linux admin
2020-11-19 15:19     ` Russell King - ARM Linux admin
2020-11-19 15:24   ` Maxime Chevallier
2020-11-19 15:24     ` Maxime Chevallier
2020-11-19 22:43     ` Tobias Waldekranz
2020-11-19 22:43       ` Tobias Waldekranz
2020-11-19 23:16       ` Russell King - ARM Linux admin
2020-11-19 23:16         ` Russell King - ARM Linux admin
2020-11-20  0:11         ` Tobias Waldekranz
2020-11-20  0:11           ` Tobias Waldekranz
2020-11-20  0:40           ` Russell King - ARM Linux admin
2020-11-20  0:40             ` Russell King - ARM Linux admin
2020-11-20  9:12             ` Tobias Waldekranz
2020-11-20  9:12               ` Tobias Waldekranz
2020-11-20  9:36           ` Maxime Chevallier
2020-11-20  9:36             ` Maxime Chevallier
2020-11-20 10:25             ` Russell King - ARM Linux admin
2020-11-20 10:25               ` Russell King - ARM Linux admin
2020-11-20 10:59               ` Tobias Waldekranz
2020-11-20 10:59                 ` Tobias Waldekranz
2020-11-20 13:55               ` Andrew Lunn [this message]
2020-11-20 13:55                 ` Andrew Lunn
2020-11-20 14:18                 ` Maxime Chevallier
2020-11-20 14:18                   ` Maxime Chevallier
2020-11-20  0:00       ` Andrew Lunn
2020-11-20  0:00         ` Andrew Lunn
2020-11-20  9:05         ` Tobias Waldekranz
2020-11-20  9:05           ` Tobias Waldekranz
2020-11-19 15:16 ` Andrew Lunn
2020-11-19 15:16   ` Andrew Lunn
2020-11-19 15:45   ` Maxime Chevallier
2020-11-19 15:45     ` Maxime Chevallier

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