netdev - Re: [PATCH 2/2] powerpc/85xx: add Fman MDIO muxing support to the P4080DS

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Date:	Tue, 14 Aug 2012 18:12:29 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	Timur Tabi <timur@...escale.com>
CC:	Kumar Gala <galak@...nel.crashing.org>,
	Andy Fleming <afleming@...escale.com>, <ddaney.cavm@...il.com>,
	<linuxppc-dev@...abs.org>, <netdev@...r.kernel.org>
Subject: Re: [PATCH 2/2] powerpc/85xx: add Fman MDIO muxing support to the
 P4080DS

On 08/14/2012 06:08 PM, Timur Tabi wrote:
> Scott Wood wrote:
>>
>> If anything, I'd make the ordering be "wrong" to force that code path to
>> be tested -- though ideally there would be a more systematic approach to
>> such testing, that doesn't require inefficiency during normal boot.
> 
> I can't force the ordering to be wrong, because it's the only entry in the
> list. The DPAA entries are not there yet.

Right, I mean once the DPAA entries are added.

> This is what I have now:
> 
> static const struct of_device_id of_device_ids[] __devinitconst = {
> 	{
> 		.compatible	= "simple-bus"
> 	},
> 	{
> 		.compatible	= "fsl,srio",
> 	},
> 	{
> 		.compatible	= "fsl,p4080-pcie",
> 	},
> 	{
> 		.compatible	= "fsl,qoriq-pcie-v2.2",
> 	},
> 	{
> 		.compatible	= "fsl,qoriq-pcie-v2.3",
> 	},
> 	{
> 		.compatible	= "fsl,qoriq-pcie-v2.4",
> 	},
> 	/* The following two are for the Freescale hypervisor */
> 	{
> 		.name		= "hypervisor",
> 	},
> 	{
> 		.name		= "handles",
> 	},
> 	{
> 		/*
> 		 * Warning: this entry might need to be located before those
> 		 * for the Fman Ethernet nodes, although using EPROBE_DEFER
> 		 * in the DPAA drivers could fix that.
> 		 */
> 		.compatible	= "mdio-mux",
> 	},

I'd either say nothing here or say only "The ethernet driver should use
EPROBE_DEFER to ensure that the mdio-mux is probed first".  Don't give
whoever submits the DPAA ethernet driver the idea that relying on list
order is an acceptable solution.

-Scott


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