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

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Date:	Sat, 27 Feb 2010 17:20:58 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	David Brownell <david-b@...bell.net>
Cc:	Ben Gardner <gardner.ben@...il.com>,
	"linux-kernel@...r.kernel.org" <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 27 Feb 2010, at 16:24, David Brownell <david-b@...bell.net> wrote:

> 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.

Indeed, but some devices do implement a distinct tristate state for  
input mode pins (disabling interrupt generation logic and so on for  
example).
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