linux-kernel - Re: [PATCH 01/03] Make non-linear GPIO ranges accesible from gpiolib

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Date:	Thu, 10 Oct 2013 14:49:13 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Linus Walleij <linus.walleij@...aro.org>,
	Christian Ruppert <christian.ruppert@...lis.com>
CC:	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>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	Alexandre Courbot <acourbot@...dia.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH 01/03] Make non-linear GPIO ranges accesible from gpiolib

On 10/09/2013 08:01 AM, Linus Walleij wrote:
> On Wed, Oct 9, 2013 at 3:28 PM, Christian Ruppert
> <christian.ruppert@...lis.com> wrote:
>> On Wed, Oct 09, 2013 at 01:58:35PM +0200, Linus Walleij wrote:
>>> On Tue, Oct 8, 2013 at 2:25 PM, Christian Ruppert
>>> <christian.ruppert@...lis.com> wrote:
...
>> Obviously, a driver (no matter for which OS) must be aware of
>> this hardware property so it can decide which value to write to which
>> register in order to control the pin mux. If we don't want to split (or
>> worse: duplicate) that information in the driver and device tree, I see
>> two alternatives.
>> 1. Define register offsets, masks and register values and the list of
>>    pins controlled by those register/value pairs in the device tree.
> 
> This is not a viable alternative of course.

Cough. pinctrl-single. Cough.
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