netdev - Re: [RFC PATCH 4/4] net: mvmdio: add getter and setter for PHY addresses

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Date:	Fri, 25 Jan 2013 20:58:51 +0100
From:	Florian Fainelli <florian@...nwrt.org>
To:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
CC:	thomas.petazzoni@...e-electrons.com, andrew@...n.ch,
	jason@...edaemon.net, arnd@...db.de, netdev@...r.kernel.org,
	gregory.clement@...e-electrons.com, ian.molton@...ethink.co.uk,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC PATCH 4/4] net: mvmdio: add getter and setter for PHY addresses

Le 25/01/2013 19:16, Jason Gunthorpe a écrit :
> On Fri, Jan 25, 2013 at 11:06:49AM +0100, Florian Fainelli wrote:
>> This patch adds orion_mdio_{set,get}_phy_addr(.., port_number, phy_addr)
>> which is a feature available in this MDIO driver to monitor a particular
>> PHY address. This brings mvmdio one step closer to what is used in
>> mv643x_eth.
>
> This seems really strange.
>
> Are you sure this should be part of the MDIO driver? Based on my docs,
> this register is part of the ethernet controller HW, which
> autonomously reads from the phy via MDIO.

My reading of the datasheets for 88F628x and Armada 370 says that it 
actually belongs to the MDIO part of the controller (it is just below 
the SMI registers).

>
> It seems cleaner to set this register from the ethernet controller
> based on the phy it is using and keep the MDIO driver purely for MDIO
> bus access.
>
> It is acceptable to overlap the device address ranges, start the
> ethernet controller at 72000 and start the MDIO at 72004, the platform
> bus code automatically nests them.

Ok I did not think this would work, but I kind of prefer that too.
--
Florian
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