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From: David Brownell <david-b@pacbell.net>
To: Mark Brown <broonie@opensource.wolfsonmicro.com>
Subject: Re: [PATCH 1/3] gpiolib: add gpio_set_direction()
Date: Sat, 27 Feb 2010 08:24:14 -0800
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Cc: Ben Gardner <gardner.ben@gmail.com>, linux-kernel@vger.kernel.org,
       Andres Salomon <dilinger@collabora.co.uk>,
       Andrew Morton <akpm@linux-foundation.org>,
       Jani Nikula <ext-jani.1.nikula@nokia.com>
References: <cover.1267225701.git.gardner.ben@gmail.com> <201002262302.18890.david-b@pacbell.net> <20100227102609.GA2994@sirena.org.uk>
In-Reply-To: <20100227102609.GA2994@sirena.org.uk>
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On Saturday 27 February 2010, Mark Brown wrote:
> > ?"none" ... since it's not even a GPIO, why would it show
> > ??????up through the GPIO subsystem???
> 
> I suspect this is intended to be tristated, which might be useful to add.

That's what "input" means, as a rule:  no output driver
is active with a GPIO configured as "iput".  "Tristate"
is an option that's relevant for outputs ... low, high,
or not-driven.

- Dave


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