netdev - Re: [PATCH 2/2] [POWERPC] UCC nodes cleanup

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Message-Id: <6B2293E0-BE5E-4C2E-9A48-4E91079A7422@kernel.crashing.org>
Date:	Mon, 14 Apr 2008 09:51:29 -0500
From:	Kumar Gala <galak@...nel.crashing.org>
To:	avorontsov@...mvista.com
Cc:	Timur Tabi <timur@...escale.com>, linuxppc-dev@...abs.org,
	Jeff Garzik <jgarzik@...ox.com>, linux-serial@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH 2/2] [POWERPC] UCC nodes cleanup


On Apr 11, 2008, at 12:31 PM, Anton Vorontsov wrote:
> On Fri, Apr 11, 2008 at 09:21:06PM +0400, Anton Vorontsov wrote:
>> On Fri, Apr 11, 2008 at 12:12:30PM -0500, Timur Tabi wrote:
>>> Anton Vorontsov wrote:
>>>
>>>> Or maybe I'm thinking here in terms of "fsl,ucc"... and cell- 
>>>> index is
>>>> indeed should be -1... don't know. Please decide. ;-)
>>>
>>> Well, that's what I was thinking.  cell-index is zero-based, so  
>>> UCC1 should have
>>> cell-index = <0>.
>>>
>>> Of course, this means all the code needs to change, since I think  
>>> device-id is
>>> one-based.
>>
>> Yup. You raised a really good question, because we're _introducing_
>> cell-index for UCC nodes, and if we'll choice wrong numbering scheme
>> now, then there will be no way back w/o breaking backward  
>> compatibility.
>
> Hm... thinking about it more, we're introducing implementation for the
> cell-index, but device tree was "infected" already.
>
> So, too late. :-D

I say leave as you have it (UCC1 == cell-index = <1>).

Changing it so cell-index = <0> is just more confusing w/regards to  
the docs.

- k
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