linux-kernel - Re: [PATCH v2 1/4] gpiolib: Add "unknown" direction support

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Message-ID: <20110221091916.GA2616@pengutronix.de>
Date:	Mon, 21 Feb 2011 10:19:16 +0100
From:	Wolfram Sang <w.sang@...gutronix.de>
To:	Alexander Stein <alexander.stein@...tec-electronic.com>
Cc:	Lars-Peter Clausen <lars@...afoo.de>,
	Eric Miao <eric.y.miao@...il.com>,
	Peter Tyser <ptyser@...-inc.com>, linux-kernel@...r.kernel.org,
	Alek Du <alek.du@...el.com>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	Uwe Kleine-K?nig <u.kleine-koenig@...gutronix.de>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Joe Perches <joe@...ches.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Grant Likely <grant.likely@...retlab.ca>
Subject: Re: [PATCH v2 1/4] gpiolib: Add "unknown" direction support


> > Sharing GPIOs in read-only mode, is indeed something that is not covered by
> > the GPIO API. It might be worth adding a gpio_request_shared, which would
> > only permit setting the direction to input. Futher gpio_request_shared
> > calls would be allowed but gpio_request calls would fail.
> 
> gpio_request_shared sounds interesting, but in this case an implicit 

Can you name a use-case? One reason is that we won't need to implement
it if there is no user, another one is that it could potentially weaken
abstractions?

Regards,

   Wolfram

-- 
Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

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