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

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Message-ID: <20200903220300.GH3112546@lunn.ch>
Date:   Fri, 4 Sep 2020 00:03:00 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Florian Fainelli <f.fainelli@...il.com>
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

> 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?

Thanks
	Andrew