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From: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Date: Mon, 16 Sep 2019 19:09:30 +0200
Message-ID: <CAFBinCCEveoA3nFyZEqg4XLoe_pzC9Fz=OTfugOyMQoKmqBetQ@mail.gmail.com>
Subject: Re: [OpenWrt-Devel] Lantiq xrx200: Access to ethernet phy registers
 (MDIO) from userspace
To: Martin Schiller <ms@dev.tdt.de>
Cc: Hauke Mehrtens <hauke@hauke-m.de>, john@phrozen.org,
 openwrt-devel@lists.openwrt.org
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Hi Martin,

On Mon, Sep 16, 2019 at 12:54 PM Martin Schiller <ms@dev.tdt.de> wrote:
>
> Hi!
>
> I am searching for a possibility to disable Auto Negotiation of an
> PEF7072 which is attached to MAC1 of the Lantiq xrx200 switch.
>
> The xrx200-net driver does not seem to have support for that.
I don't know about xrx200-net, but ...

> Accessing the STD_CRTL register on the mdio bus from uboot with the mdio
> command works like expected.
>
> Any suggestions how to do that from linux userspace?
... my (limited) understanding is that this is one of the benefits of DSA:
you get one interface per port - with that you can use for example
ethtool to disable auto negotiation for one port
kernel source reference: [0]


Martin


[0] https://elixir.bootlin.com/linux/latest/source/net/dsa/slave.c#L1133

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