linux-kernel - Re: [PATCH 1/3] gpiolib: add gpio_set

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Message-Id: <201002270824.14889.david-b@pacbell.net>
Date:	Sat, 27 Feb 2010 08:24:14 -0800
From:	David Brownell <david-b@...bell.net>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	Ben Gardner <gardner.ben@...il.com>, linux-kernel@...r.kernel.org,
	Andres Salomon <dilinger@...labora.co.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jani Nikula <ext-jani.1.nikula@...ia.com>
Subject: Re: [PATCH 1/3] gpiolib: add gpio_set_direction()

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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