linux-kernel - Re: [PATCH 1/2] pinmux: Add TB10x pinmux driver

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Date:	Thu, 02 May 2013 12:52:33 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Christian Ruppert <christian.ruppert@...lis.com>
CC:	linux-kernel@...r.kernel.org,
	Linus Walleij <linus.walleij@...aro.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Rob Landley <rob@...dley.net>,
	Sascha Leuenberger <sascha.leuenberger@...lis.com>,
	Pierrick Hascoet <pierrick.hascoet@...lis.com>,
	devicetree-discuss@...ts.ozlabs.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH 1/2] pinmux: Add TB10x pinmux driver

On 04/18/2013 03:03 AM, Christian Ruppert wrote:
> Dear Stephen and Linus,
> 
> I am responding to this message because it touches the core issue I was
> wondering about when integrating pinctrl with GPIO. I think all
> unrelated comments in your other messages are valid and will be
> addressed in the next iteration of both drivers.
> 
> On Wed, Apr 17, 2013 at 12:32:00PM -0600, Stephen Warren wrote:
>> On 04/10/2013 09:45 AM, Christian Ruppert wrote:
>>> The pinmux driver of the Abilis Systems TB10x platform based on ARC700 CPUs.
>>> Used to control the pinmux and is a prerequisite for the GPIO driver.
>>
>> Linus already did a review of this, but I have a few extra comments:
>>
>>> diff --git a/Documentation/devicetree/bindings/pinctrl/abilis,tb10x-iomux.txt b/Documentation/devicetree/bindings/pinctrl/abilis,tb10x-iomux.txt
...
>> * A list of pins/groups to apply the settings to.
> 
> This is what the pingrp string refers to. We really don't want to expose
> Linux internal pin numbers!

I wasn't suggesting a particular naming/numbering scheme for the pins,
but simply that the document has to state what that naming/numbering
scheme is, so that people know how to fill in the DT. If the
naming/numbering scheme exactly matches some HW manual, then it should
be enough to say e.g. "see section X in Foo manual", to avoid
duplicating the information. If not, then the valid values should be
listed in the binding document.
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