netdev - Re: [PATCH net-next v1 1/1] net: phy: dp83td510: Add basic support for the DP83TD510 Ethernet PHY

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Date:   Tue, 27 Jul 2021 08:51:51 +0200
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Russell King <linux@...linux.org.uk>,
        Dan Murphy <dmurphy@...com>, kernel@...gutronix.de,
        David Jander <david@...tonic.nl>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Heiner Kallweit <hkallweit1@...il.com>
Subject: Re: [PATCH net-next v1 1/1] net: phy: dp83td510: Add basic support
 for the DP83TD510 Ethernet PHY

On Mon, Jul 26, 2021 at 03:23:00PM +0200, Andrew Lunn wrote:
> > With current driver ethtool with show this information:
> > Settings for eth1:
> > 	Supported ports: [ TP	 MII ]
> > 	Supported link modes:   Not reported
> 
> Interesting. The default function for getting the PHYs abilities is
> doing better than i expected. I was guessing you would see 10BaseT
> here.
> 
> Given that, what you have is O.K. for the moment. 
> 
> > > I suspect you are talking about the PoE aspects. That is outside the
> > > scope for phylib. PoE in general is not really supported in the Linux
> > > kernel, and probably needs a subsystem of its own.
> > 
> > No, no. I'm talking about data signals configuration (2.4Vpp/1Vpp), which
> > depends on application and cable length. 1Vpp should not be used with
> > cable over 200 meter
> 
> Should not be used, or is not expected to work very well?

ack, it will not work very well :)

> > and 2.4Vpp should not be used on safety critical applications. 
> 
> Please work with the other T1L driver writer to propose a suitable way
> to configure this. We want all T1L drivers to use the same
> configuration method, DT properties etc.

ack.

After getting 802.3cg-2019 i give NACK to my patch. At least part
of all needed functionality can be implemented as common code.

Regards,
Oleksij
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