linux-kernel - Re: [PATCH net-next 0/1] Add BASE-T1 PHY support

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Date:   Wed, 16 Oct 2019 10:37:27 +0200
From:   Lucas Stach <l.stach@...gutronix.de>
To:     Heiner Kallweit <hkallweit1@...il.com>,
        Christian Herber <christian.herber@....com>,
        "davem@...emloft.net" <davem@...emloft.net>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next 0/1] Add BASE-T1 PHY support

On Fr, 2019-08-16 at 22:59 +0200, Heiner Kallweit wrote:
> On 15.08.2019 17:32, Christian Herber wrote:
> > This patch adds basic support for BASE-T1 PHYs in the framework.
> > BASE-T1 PHYs main area of application are automotive and industrial.
> > BASE-T1 is standardized in IEEE 802.3, namely
> > - IEEE 802.3bw: 100BASE-T1
> > - IEEE 802.3bp 1000BASE-T1
> > - IEEE 802.3cg: 10BASE-T1L and 10BASE-T1S
> > 
> > There are no products which contain BASE-T1 and consumer type PHYs like
> > 1000BASE-T. However, devices exist which combine 100BASE-T1 and 1000BASE-T1
> > PHYs with auto-negotiation.
> 
> Is this meant in a way that *currently* there are no PHY's combining Base-T1
> with normal Base-T modes? Or are there reasons why this isn't possible in
> general? I'm asking because we have PHY's combining copper and fiber, and e.g.
> the mentioned Aquantia PHY that combines NBase-T with 1000Base-T2.

There are PHYs combining both Base-T1 and other Base-T capabilities.
E.g. the Broadcom BCM54811 support both Base-T1, as well as 1000BASE-T
and 100BASE-TX.

Regards,
Lucas