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

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Message-ID: <CACRpkdZ=WarECW3xhMv2woWJW7JxgoMH73Yufep6VyLkzBGiXQ@mail.gmail.com>
Date:	Sun, 16 Jun 2013 13:11:23 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Christian Ruppert <christian.ruppert@...lis.com>
Cc:	Stephen Warren <swarren@...dotorg.org>,
	Haojian Zhuang <haojian.zhuang@...aro.org>,
	Shiraz HASHIM <shiraz.hashim@...com>,
	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 Tue, Jun 11, 2013 at 9:27 AM, Christian Ruppert
<christian.ruppert@...lis.com> wrote:
> On Fri, Jun 07, 2013 at 01:18:35PM -0600, Stephen Warren wrote:

>> However, then the correlation between these pretend pins (i.e. really
>> the groups) and GPIOs won't work, because each "pin" is really 4 pins,
>> and hence 4 GPIOs, and hence you won't be able to gpio_get() more than 1
>> GPIO per pin group, I think.
>
> I agree: Unluckily, pinctrl-single doesn't seem to be what we are looking
> for.

I agree on this conclusion.

> We already have a draft for a native pinctrl driver (see original post)
> but there was some disagreement about exposing kernel internal pin
> numbering to device tree users.

But that is an orthogonal issue I believe.

Yours,
Linus Walleij
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