netdev - Re: [PATCH] net: fec: Add support for multiple phys on mdiobus

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Date:	Mon, 21 Jan 2013 11:07:01 +0100
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Wolfgang Grandegger <wg@...ndegger.com>
Cc:	netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	shawn.guo@...aro.org, davem@...emloft.net
Subject: Re: [PATCH] net: fec: Add support for multiple phys on mdiobus

On Mon, Jan 21, 2013 at 09:56:24AM +0100, Wolfgang Grandegger wrote:
> On 01/21/2013 09:37 AM, Sascha Hauer wrote:
> > There may be multiple phys on an mdio bus. This series adds support
> > for this to the fec driver. I recently had a board which has a switch
> > connected to the fec's mdio bus, so I had to pick the correct phy.
> 
> Pick one PHY from a switch port? Well, does a PHY-less (or fixed-link)
> configuration for a switch not make more sense?

Yes, you're probably right.

> Various ARM Ethernet
> contoller drivers do not support it. I recently needed a hack for an
> AT91 board.

I wonder how we want to proceed. Should there be a devicetree property
'fixed-link' like done for fs_enet (and not recommended for new code,
stated in the comment above of_phy_connect_fixed_link)?

Currently I have a property 'phy' in the fec binding which has a phandle
to a phy provided by the fec's mdio bus, but this could equally well
point to a fixed dummy phy:

	phy = &fixed-phy;

Currently there seems to be no common convention for the devicetree how
to handle such situations, or am I missing something?

Sascha

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