netdev - Re: [RFC PATCH net-next 0/8] net: dsa: New registration API

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Message-ID: <20150430172726.GF18874@lunn.ch>
Date:	Thu, 30 Apr 2015 19:27:26 +0200
From:	Andrew Lunn <andrew@...n.ch>
To:	Florian Fainelli <f.fainelli@...il.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net,
	vivien.didelot@...oirfairelinux.com,
	jerome.oufella@...oirfairelinux.com, linux@...ck-us.net,
	cphealy@...il.com, mathieu@...eaurora.org, jonasj76@...il.com,
	andrey.volkov@...vision.fr, Chris.Packham@...iedtelesis.co.nz
Subject: Re: [RFC PATCH net-next 0/8] net: dsa: New registration API

On Thu, Apr 30, 2015 at 09:50:36AM -0700, Florian Fainelli wrote:
> On 30/04/15 06:12, Andrew Lunn wrote:
> >> Note that there are currenlty no incompatibles changes made to existing Device
> >> Tree sources, rather, depending on the bus we are probed for, e.g: MDIO
> >> the dsa,mii-bus and dsa,ethernet phandles and first cell of the  "reg" property
> >> will become obsolete, everything else remains entirely compatible. 
> > 
> > Hi Florian
> > 
> > I'm not sure dsa,mii-bus and dsa,ethernet will become obsolete. At
> > least they are probably needed for multi switch setups, and the
> > possible but probably unlikely multi DSA setups.
> > 
> > You cannot assume that dsa,mii-bus and dsa,ethernet have the same
> > parent. In a multi switch setup, it could be there is an mdio-mux in
> > the picture. So all your probe really tells you, is that there is a
> > switch on this mii bus, but you don't know what ethernet it is hanging
> > off.
> 
> Good point.
> 
> > 
> > The switch could be hanging off multiple ethernets. I'm working on
> > supporting this for the WRT1900AC, where i use the bond driver on the
> > host side. So dsa,ethernet is a phandle to a bond interface.
> 
> Humm, bond is a software constructs,

I thought about this for a while, and came to the conclusion that it
is often a software construct, but it can also be a hardware
construct, when you have two ethernet interfaces connected to a
switch, all on one PCB. So i added a DT binding for bonding. In the
case of WRT1900AC, it looks like:

       bond: bond {
               compatible = "linux,bond";
               slaves = < &eth0 >, < &eth1 >;
       };

and then in DSA i have a phandle to this bond interface. This part
works great, but i've not posted these patches yet, because it does
not work yet because of some other issue. Maybe when i do post this,
it will get shot down?

     Andrew
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