linux-kernel - Re: [PATCH v5 2/3] gpio: grgpio: Add device driver for GRGPIO cores

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Date:	Tue, 23 Apr 2013 13:09:28 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Andreas Larson <andreas@...sler.com>
Cc:	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Anton Vorontsov <anton.vorontsov@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>, software@...sler.com
Subject: Re: [PATCH v5 2/3] gpio: grgpio: Add device driver for GRGPIO cores

On Mon, Apr 15, 2013 at 2:38 PM, Andreas Larson <andreas@...sler.com> wrote:
> On 2013-04-10 20:50, Linus Walleij wrote:

>>> +Required properties:
>>> +
>>> +- name : Should be "GAISLER_GPIO" or "01_01a"
>>
>> What is this? Don't we usually use a .compatible string for this?
>> Name? Que? Is that something legacy?
>
> Regarding using name, this is standard for SPARC. The names in the
> device tree originates from the PROM.
>
> The name field is the actually the first field checked for a match in
> of_match_node, followed by type then compatible. See
> http://lxr.free-electrons.com/source/drivers/of/base.c#L572
>
(...)
> As for the "01_01a", the LEON SPARC systems uses a plug&play to identify
> different IP cores in the system. When the PROM is unaware of the name
> of a certain core, the name field presented from the prom will be on
> this form. This is standard handling for LEON SPARC drivers.

Thanks for detailing this! There is such a big world out there sometimes.

I'm sort of wondering why we do things the way we do in the ARM DT
world sometimes. Specifically I suspect that we should be using
name or type rather than compatible for the ARM PrimeCells, which
are a sort of plug-n-play type devices, but I guess it's too late
to change that now...

Yours,
Linus Walleij
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