linux-kernel - Re: GPIO support for HTC Dream

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Date:	Tue, 15 Dec 2009 21:47:48 +0100
From:	Pavel Machek <pavel@....cz>
To:	H Hartley Sweeten <hartleys@...ionengravers.com>
Cc:	Ryan Mallon <ryan@...ewatersys.com>,
	Daniel Walker <dwalker@...eaurora.org>,
	Iliyan Malchev <malchev@...gle.com>,
	Brian Swetland <swetland@...gle.com>,
	kernel list <linux-kernel@...r.kernel.org>,
	Arve Hj?nnev?g <arve@...roid.com>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: GPIO support for HTC Dream

Hi!

> >> For completeness you should probably also add:
> >> 
> >> static inline int irq_to_gpio(unsigned irq)
> >> {
> >> 	return -EINVAL;
> >> }
> >
> > I'd say that would be overdoing it.
> 
> I only mentioned that one because it is one of the functions listed in
> Documentation/gpio.txt.  I'm not sure if that means it's "required".  You
> make the call...

Aha, sorry, I misparsed that. There's gpio_to_irq and irq_to_gpio. One
does not seem to be required; as I'm stubbing the other one, I'd
prefer to leave it alone.

> >> Otherwise, looks good to me.  Just test it to make sure it works :-).
> >> 
> >> Since I have no way of compiling or testing this...
> >> 
> >> Reviewed-by: H Hartley Sweeten <hsweeten@...ionengravers.com>
> >
> > I believe inlining that function would be bad change. Can I still use
> > reviewed-by tag?
> 
> The reason I suggest making it an inline in the header is you might
> eventually want to change both gpio_to_irq and irq_to_gpio into macros
> so that they can be used for static initializers.  For right now both
> are simple return -EINVAL but when gpio irq's are supported you might
> find a need to use one or the other in a platform init...

According to gpio.txt, those are functions, not macros... and I
actually prefer functions, as they are harder to misuse.

> Regardless, yes you can still use my reviesed-by tag.

Thanks.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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