[OpenWrt-Devel] Lantiq xrx200: Access to ethernet phy registers (MDIO) from userspace

[Hauke Mehrtens]

On 9/16/19 7:09 PM, Martin Blumenstingl wrote:
> Hi Martin,
> 
> On Mon, Sep 16, 2019 at 12:54 PM Martin Schiller <ms at 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]

I also do not know if xrx200-net supports that or if it is possible with
swconfig at all. There is also a DSA driver for this switch in the
mainline kernel:
https://elixir.bootlin.com/linux/latest/source/drivers/net/dsa/lantiq_gswip.c

This driver should support everything the xrx200-net driver supports
plus some extras.
I would prefer to use the DSA driver also in OpenWrt, but we need a way
to migrate the existing configurations which are based on swconfig to DSA.

You could try the fixed-link attribute in device tree to model this with
DSA.

Hauke

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