Messages in this thread | | | Date | Thu, 03 Feb 2011 12:53:51 -1000 | From | Mitch Bradley <> | Subject | Re: [PATCH v2] altera_ps2: Add devicetree support |
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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.
> > Greetz > Walter > > > _______________________________________________ > devicetree-discuss mailing list > devicetree-discuss@lists.ozlabs.org > https://lists.ozlabs.org/listinfo/devicetree-discuss >
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