netdev - Re: [PATCH] net: dsa: mv88e6xxx: fix mdio bus name when using devicetree

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Date:   Tue, 02 May 2017 10:26:03 -0400
From:   Sylvain Lemieux <slemieux.tyco@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     vivien.didelot@...oirfairelinux.com, netdev@...r.kernel.org
Subject: Re: [PATCH] net: dsa: mv88e6xxx: fix mdio bus name when using
 devicetree

Hi Andrew,

On Mon, 2017-05-01 at 17:20 +0200, Andrew Lunn wrote:
> On Mon, May 01, 2017 at 10:54:04AM -0400, Sylvain Lemieux wrote:
> > From: Liam Beguin <lbeguin@...oint.com>
> > 
> > mv88e6xxx_mdio_register automatically generates mdio buses for each switch
> > discovered in the devicetree. When switch nodes are embedded in other nodes,
> > this can cause sysfs naming collisions since full_name may be truncated.
> > 
> > Only use devicetree node name instead of the full devicetree path
> > as the mdio bus name.
> 
> Hi Sylvain
> 
> I'm not sure this is a good idea. It probably breaks my boards:
> 
> :/sys/class/mdio_bus# ls
> !mdio-mux!mdio@...witch@...dio	0.1  0.4  400d0000.ethernet-1  fixed-0
> !mdio-mux!mdio@...witch@...dio	0.2  0.8  400d1000.ethernet-2  mv88e6xxx-0
> 
> np->name is not unique, where as np->full_name is unique.
> 
> However, i can understand your problem with truncation. Maybe a better
> solution is to detect if truncation is going to happen. If so, use a
> concatenation of a hash of np->full_name, and the right hand part of
> np->full_name?
> 
Thanks for the feedback.

I am currently busy on something else; I should be able to look at this
next week or the following.

Regards,
Sylvain

> 	Andrew