linux-kernel - Re: [PATCH 2/2] pinctrl: add a generic control interface

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Message-ID: <20111021123041.GE4080@opensource.wolfsonmicro.com>
Date:	Fri, 21 Oct 2011 13:30:41 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Barry Song <21cnbao@...il.com>,
	Shawn Guo <shawn.guo@...escale.com>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	linux-kernel@...r.kernel.org, Stephen Warren <swarren@...dia.com>,
	Linaro Dev <linaro-dev@...ts.linaro.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	David Brown <davidb@...eaurora.org>,
	Grant Likely <grant.likely@...retlab.ca>
Subject: Re: [PATCH 2/2] pinctrl: add a generic control interface

On Fri, Oct 21, 2011 at 02:28:25PM +0200, Linus Walleij wrote:
> On Thu, Oct 20, 2011 at 5:42 PM, Mark Brown
> > On Thu, Oct 20, 2011 at 04:43:30PM +0200, Linus Walleij wrote:

> >> In Ux500 we model our power domain switches as regulators,
> >> does such a property even belong in pin control? Is there
> >> one power domain switch per pin you mean, or a power switch
> >> for a whole group of pins?

> > This isn't an on/off control and in this cae it's per pin.

> If this is a binary output pin, I suspect that
> I suspect that what you call "off" is actually implemeted as
> in this figure:

To repeat once more: this is *not* an on/off control, this is a control
selecting the voltage domain a pin is referenced to.

> http://upload.wikimedia.org/wikipedia/commons/c/c0/Tristate_buffer.svg

No, this is completely orthogonal to voltage domain selection.
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