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Date:   Fri, 18 Sep 2020 00:15:47 +0200
From:   Andrew Lunn <>
To:     Sergej Bauer <>
Cc:     "David S. Miller" <>,
        Jakub Kicinski <>,
        Bryan Whitehead <>,
        Microchip Linux Driver Support <>,
        Mauro Carvalho Chehab <>,
        Rob Herring <>,,
Subject: Re: [PATCH] add virtual PHY for PHY-less devices

On Fri, Sep 18, 2020 at 12:40:10AM +0300, Sergej Bauer wrote:
> From:
>     Here is a kernel related part of my work which was helps to develop brand
> new PHY device.
>     It is migth be helpful for developers work with PHY-less lan743x
> (7431:0011 in my case). It's just a fake virtual PHY which can change speed of
> network card processing as a loopback device. Baud rate can be tuned with
> ethtool from command line or by means of SIOCSMIIREG ioctl. Duplex mode not
> configurable and it's allways DUPLEX_FULL.

Hi Sergej

What is the advantage of this over using driver/net/phy/fixed_phy.c
which also emulates a standard PHY?


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