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

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Date:	Tue, 14 Aug 2012 16:58:33 -0500
From:	Timur Tabi <timur@...escale.com>
To:	Scott Wood <scottwood@...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

Scott Wood wrote:

> I think that was internally, and not on this specific comment wording.
> I don't think that code comment adequately explains things.

I don't really have any more insight to add.

>> otherwise, the mdio-mux code would not prepare the mdio mus in time, and
>> there would be initialization failures.  Now maybe this goes away with
>> -EPROBE_DEFER, or maybe it doesn't.  But until we push the DPAA drivers
>> upstream, we won't know.
> 
> Do you know if it's theoretically supposed to be fixed and just can't
> test it, or are you unsure of whether it's even supposed to work?

I'm not sure of anything.  For one thing, we don't implement EPROBE_DEFER
in the DPAA drivers, so we'd probably have to fix that before anything.
And then, I'm just guessing that's the solution.

> I don't think we should be relying on the order of this list to
> determine probe order.  For one thing, it won't work if the drivers
> register after you create the platform devices (e.g. they're modules).

I agree we should not be relying on the order, but I don't know what to
do.  EPROBE_DEFER was designed to handle this situation, so my
recommendation is to worry about it later.  I can beef up the comment to
talk about that, if you want.

-- 
Timur Tabi
Linux kernel developer at Freescale

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