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

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Date:	Fri, 21 Oct 2011 14:28:25 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
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 Thu, Oct 20, 2011 at 5:42 PM, Mark Brown
<broonie@...nsource.wolfsonmicro.com> wrote:
> 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:
http://upload.wikimedia.org/wikipedia/commons/c/c0/Tristate_buffer.svg

In which case:
PIN_CONFIG_DRIVE_PUSH_PULL
PIN_CONFIG_DRIVE_OFF
or PIN_CONFIG_BIAS_HIGH_IMPEDANCE

Is a config pair which most often correspond to
exactly what you're doing here, albeit with a different
terminology.

However, if it is an *analog* pin....
Then it's something else.

Yours,
Linus Walleij
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