linux-kernel - Re: How about a gpio_get(device *, char *) function?

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Date:	Thu, 29 Nov 2012 17:34:07 +0000
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Alex Courbot <acourbot@...dia.com>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	Stephen Warren <swarren@...dotorg.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: How about a gpio_get(device *, char *) function?

On Wed, 28 Nov 2012 12:38:38 +0900, Alex Courbot <acourbot@...dia.com> wrote:
> On Monday 26 November 2012 19:14:31 Grant Likely wrote:
> > I don't have any problem with a gpio_get function, but I do agree that
> > making it return an opaque handle is how it should be written with a new
> > set of accessors. The handle should probably be simply the pointer to
> > the &gpio_desc[number] which is a private table in gpiolib.c. The
> > definition of it isn't available outside of gpiolib.c
> 
> That looks like a reasonable approach, but this would make the new API 
> available only to systems that use GPIOlib. Shouldn't we be concerned about 
> making this available to all GPIO implementations? Or is GPIOlib so widely 
> used that we don't care?

I'm tempted to say non-gpiolib is not supported. However, there isn't
anything that would prevent non-gpiolib users from implementing the api
themselves, but they'd need to provide their own handle..

g.
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