linux-kernel - Re: [PATCH 1/3] gpiolib: make gpio_to

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Message-Id: <200808141645.56418.laurentp@cse-semaphore.com>
Date:	Thu, 14 Aug 2008 16:45:52 +0200
From:	Laurent Pinchart <laurentp@...-semaphore.com>
To:	avorontsov@...mvista.com
Cc:	linuxppc-dev@...abs.org, "Greg Kroah-Hartman" <greg@...ah.com>,
	linux-usb@...r.kernel.org,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	Li Yang <leoli@...escale.com>, linux-kernel@...r.kernel.org,
	Timur Tabi <timur@...escale.com>
Subject: Re: [PATCH 1/3] gpiolib: make gpio_to_chip() public

On Thursday 14 August 2008, Anton Vorontsov wrote:
> On Thu, Aug 14, 2008 at 04:04:18PM +0200, Laurent Pinchart wrote:
> > On Friday 08 August 2008, Anton Vorontsov wrote:
> > > We'll need this function to write platform-specific hooks to deal
> > > with pin's dedicated functions. Quite obviously this will work only
> > > for the platforms with 1-to-1 GPIO to PIN mapping.
> > > 
> > > This is stopgap solution till we think out and implement a proper
> > > api (pinlib?).
> > 
> > How do you support reverting the GPIO mode to non-dedicated ?
> 
> As we always do with the GPIO API: gpio_direction_*() calls.

So the proper sequence to configure a pin in dedicated mode is to set the direction first (which will unset the dedicated mode bit) and then set dedicated mode (which will not touch the direction bit) ?

-- 
Laurent Pinchart
CSE Semaphore Belgium

Chaussee de Bruxelles, 732A
B-1410 Waterloo
Belgium

T +32 (2) 387 42 59
F +32 (2) 387 42 75

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