linux-kernel - Re: [PATCH 5/5] mv643xx_eth: convert to use the Marvell Orion MDIO driver

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Date:	Tue, 29 Jan 2013 17:27:56 +0100
From:	Florian Fainelli <florian@...nwrt.org>
To:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
CC:	davem@...emloft.net, Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Rob Landley <rob@...dley.net>,
	Jason Cooper <jason@...edaemon.net>,
	Andrew Lunn <andrew@...n.ch>,
	Russell King <linux@....linux.org.uk>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Lennert Buytenhek <buytenh@...tstofly.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devicetree-discuss@...ts.ozlabs.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linuxppc-dev@...ts.ozlabs.org, netdev@...r.kernel.org
Subject: Re: [PATCH 5/5] mv643xx_eth: convert to use the Marvell Orion MDIO
 driver

On 01/29/2013 05:01 PM, Thomas Petazzoni wrote:
> Dear Florian Fainelli,
>
> On Tue, 29 Jan 2013 16:24:08 +0100, Florian Fainelli wrote:
>> This patch converts the Marvell MV643XX ethernet driver to use the
>> Marvell Orion MDIO driver. As a result, PowerPC and ARM platforms
>> registering the Marvell MV643XX ethernet driver are also updated to
>> register a Marvell Orion MDIO driver. This driver voluntarily overlaps
>> with the Marvell Ethernet shared registers because it will use a subset
>> of this shared register (shared_base + 0x4 - shared_base + 0x84). The
>> Ethernet driver is also updated to look up for a PHY device using the
>> Orion MDIO bus driver.
>>
>> Signed-off-by: Florian Fainelli <florian@...nwrt.org>
>> ---
>>   arch/arm/plat-orion/common.c               |   84 +++++++++++--
> In this file, there was one "MV643XX_ETH_SHARED_NAME" platform_device
> registered for each network interface. Why? If the driver is shared,
> isn't the whole idea to register it only once?
It looks like I introduced two redundant mvmdio instances as ge01 refers 
to the ge00 smi bus (the same applies to ge11 and ge10). Thanks for 
spotting this.

>
> In any case, one of the idea of separating the mvmdio driver from the
> mvneta driver in the first place is that there should be only one
> instance of the mvmdio device, even if there are multiple network
> interfaces. The reason is that from a HW point of the view, the MDIO
> unit is shared between the network interfaces. If you look at
> armada-370-xp.dtsi, there is only one mvmdio device registered, and two
> network interfaces (using the mvneta driver) that are registered (and
> actually up to four network interfaces can exist, they are added by
> some other .dtsi files depending on the specific SoC).
>
> So I don't think there should be one instance of the mvmdio per network
> interface.
>
> Also, I am wondering what's left in this MV643XX_ETH_SHARED_NAME driver
> once the MDIO stuff has been pulled out in a separate driver? I think
> the whole point of this work should be to get rid of this
> MV643XX_ETH_SHARED_NAME driver, no?

If you take a closer look at mv643xx_eth you will see that the "shared" 
driver still handles the mconf bus window configuration, which is not 
abstracted yet. Besides that, I would rather do it step by step.
--
Florian
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