linux-kernel - Re: [PATCH v2] altera_ps2: Add devicetree support

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Date:	Fri, 04 Feb 2011 00:02:28 +0100
From:	Walter Goossens <waltergoossens@...e.nl>
To:	Mitch Bradley <wmb@...mworks.com>
CC:	Grant Likely <grant.likely@...retlab.ca>,
	nios2-dev@...c.et.ntust.edu.tw,
	devicetree-discuss@...ts.ozlabs.org,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-kernel@...r.kernel.org, linux-input@...r.kernel.org
Subject: Re: [PATCH v2] altera_ps2: Add devicetree support

On 2/3/11 11:53 PM, Mitch Bradley wrote:
> On 2/3/2011 12:27 PM, Walter Goossens wrote:
>> On 2/2/11 4:39 PM, Grant Likely wrote:
>>> On Wed, Feb 02, 2011 at 07:48:58PM +0800, Thomas Chou wrote:
>>>> On 02/02/2011 12:31 PM, Grant Likely wrote:
>>>>>> +static const struct of_device_id altera_ps2_match[] = {
>>>>>> + { .compatible = "altr,ps2-1.0", },
>>>>> I thought I had seen 'altera' instead of an abbreviation being 
>>>>> used in
>>>>> a previous patch. I don't care much whether 'altr' or 'altera' is
>>>>> used, but I'd like to know that there is consensus from the Altera
>>>>> users so that all the drivers use the same prefix.
>>>>>
>>>> We had discussed on nios2-dev mailing list, and decided to use
>>>> 'altr' as Walter suggested that it saves space.
>>> Is altr the stock ticker symbol? The convention is to either use the
>>> stock ticker in all uppercase (although the uppercase bit hasn't been
>>> consistently applied), or to use the full name in lowercase.
>>>
>>> g.
>>>
>>>
>> Risking my limbs here by breaking in this late in the discussion... (I
>> wasn't able to reply earlier) but where does it state it needs to be
>> uppercase? I found a bunch of microblaze code which seems to use the
>> lowercase xlnx and freescale seems happy with fsl. Unless I'm missing
>> something obvious here I guess ALTR would actually be the first to use
>> uppercase.
>> The only reference to uppercase I found in the ePAPR docs was chapter
>> 1.6 that talks about uppercase hex-characters as an OUI.
>> Not that I terribly mind either way, but I want to double-check before
>> we go ahead and change all altera-related devicetree stuff to uppercase.
>
>
> The relevant text in IEEE 1275-1994 is in the description of the 
> "name" property in Annex A.  If a node name begins with a sequence of 
> from one to five uppercase letters followed by a comma, that means a 
> stock symbol on some exchange whose names do not conflict with NYSE or 
> NASDAQ.
>
> A lower-case prefix is okay, but it does not necessarily mean that it 
> is a ticker symbol.  So in some sense, a lower case prefix provides 
> less protection against collisions than an upper case prefix, which 
> comes from an externally-arbitrated name space.  Case is explicitly 
> significant in node names.
>
> In practice, the important thing is that names must not conflict.  
> Name collisions haven't been much of a problem so far.
>
Excellent!
Must have missed that one. Good reason. We'll change 'm!

Thanks
Walter
>>
>> Greetz
>> Walter
>>
>>
>> _______________________________________________
>> devicetree-discuss mailing list
>> devicetree-discuss@...ts.ozlabs.org
>> https://lists.ozlabs.org/listinfo/devicetree-discuss
>>
>

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