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

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Date:	Wed, 08 May 2013 14:01:53 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Christian Ruppert <christian.ruppert@...lis.com>
CC:	Linus Walleij <linus.walleij@...aro.org>,
	Patrice CHOTARD <patrice.chotard@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.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" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: Re: [PATCH 1/2] pinmux: Add TB10x pinmux driver

On 05/08/2013 10:41 AM, Christian Ruppert wrote:
...
> What do you think about the following modification to the pinctrl/GPIO
> frameworks instead (not yet a formal patch, more a request for comment
> to illustrate what I mean. If you agree, I will clean it up and submit a
> proper patch after discussion).
> 
> It adds a dt_gpiorange_xlate function to the pinctrl callbacks which
> defaults to the conventional behaviour using kernel logical pin numbers.
> However, pin controllers which provide more complex mechanisms can
> define #gpio-range-cells and provide this callback in order to keep
> Linux pin numbering inside the kernel.

Can you provide an example of the DT content, and explain exactly what
this patch does with it; what effect it has on the existing GPIO or
pinctrl code?
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