linux-kernel - Re: [PATCH] add virtual PHY for PHY-less devices

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Message-ID: <20200917221547.GD3598897@lunn.ch>
Date:   Fri, 18 Sep 2020 00:15:47 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Sergej Bauer <sbauer@...ckbox.su>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Bryan Whitehead <bryan.whitehead@...rochip.com>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Rob Herring <robh@...nel.org>, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH] add virtual PHY for PHY-less devices

On Fri, Sep 18, 2020 at 12:40:10AM +0300, Sergej Bauer wrote:
> From: sbauer@...ckbox.su
> 
>     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?

      Andrew