linux-kernel - Re: [PATCH net-next] net: dsa: bcm_sf2: Ensure that MDIO diversion is used

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Date:   Thu, 3 Sep 2020 21:00:13 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org, Vivien Didelot <vivien.didelot@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next] net: dsa: bcm_sf2: Ensure that MDIO diversion is
 used



On 9/3/2020 3:03 PM, Andrew Lunn wrote:
>> The firmware provides the Device Tree but here is the relevant section for
>> you pasted below. The problematic device is a particular revision of the
>> silicon (D0) which got later fixed (E0) however the Device Tree was created
>> after the fixed platform, not the problematic one. Both revisions of the
>> silicon are in production.
>>
>> There should have been an internal MDIO bus created for that chip revision
>> such that we could have correctly parented phy@0 (bcm53125 below) as child
>> node of the internal MDIO bus, but you have to realize that this was done
>> back in 2014 when DSA was barely revived as an active subsystem. The
>> BCM53125 node should have have been converted to an actual switch node at
>> some point, I use a mdio_boardinfo overlay downstream to support the switch
>> as a proper b53/DSA switch, anyway.
> 
> I was expecting something like that. I think this patch needs a
> comment in the code explaining it is a workaround for a DT blob which
> cannot be changed. Maybe also make it conditional on the board
> compatible string?

It is already targeted at the Broadcom pseudo PHY address (30) which is 
the one that needs diversion, I will update the patch description 
accordingly though.
-- 
Florian