netdev - Re: [RFC PATCH net-next 3/8] net: phy: Allow PHY devices to identify themselves as Ethernet switches

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Message-ID: <20150430181946.GD1476@lunn.ch>
Date:	Thu, 30 Apr 2015 20:19:46 +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 3/8] net: phy: Allow PHY devices to identify
 themselves as Ethernet switches

> > Are you suggesting this phy driver sat in the middle effectively
> > performs auto negotiation in both directions? It sees what both sides
> > offer and then gives back the highest common setting?
> 
> Yes, that's what I would be tempted to do.

O.K, i need to think about that for a while.
 
> So right now, for any port you can utilize standard PHY-related or
> fixed-PHY related properties, for instance this is what I use on a
> BCM7445 which has the following setup:
> 
> - Port 0 has an internal gigabit PHY on dsa,mii-bus
> - Port 1 is connected to an external BCM53125 switch
> - Port 7 is connected to an internal MoCA PHY, whose link comes from a
> special interrupt
> - Port 8 is CPU
> 
> So today, the only thing we are missing is giving the CPU port some link
> information, but we could probably utilize a 'fixed-link' property for
> that maybe?

The Marvell drivers don't look at this phy information. But i should
have good examples from the SF2 driver i can use :-)

I also think the core DSA code does not allow for a phy on CPU and DSA
ports. But that should not be too big a problem.

       Andrew
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