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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next prev parent reply other threads:[~2020-11-20 13:56 UTC|newest]
Thread overview: 18+ 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 14:55 ` 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 22:43 ` Tobias Waldekranz
2020-11-19 23:16 ` Russell King - ARM Linux admin
2020-11-20 0:11 ` Tobias Waldekranz
2020-11-20 0:40 ` Russell King - ARM Linux admin
2020-11-20 9:12 ` Tobias Waldekranz
2020-11-20 9:36 ` Maxime Chevallier
2020-11-20 10:25 ` Russell King - ARM Linux admin
2020-11-20 10:59 ` Tobias Waldekranz
2020-11-20 13:55 ` Andrew Lunn [this message]
2020-11-20 14:18 ` Maxime Chevallier
2020-11-20 0:00 ` Andrew Lunn
2020-11-20 9:05 ` Tobias Waldekranz
2020-11-19 15:16 ` Andrew Lunn
2020-11-19 15:45 ` Maxime Chevallier
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