linux-kernel - Re: GPIO support for HTC Dream

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Date:	Wed, 16 Dec 2009 09:24:21 +1300
From:	Ryan Mallon <ryan@...ewatersys.com>
To:	Pavel Machek <pavel@....cz>
CC:	H Hartley Sweeten <hartleys@...ionengravers.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

Pavel Machek wrote:
> Hi!
> 
>>> +int gpio_to_irq(unsigned gpio)
>>> +{
>>> +	return -EINVAL;
>>> +}
>> This should probably just be an inline function in
>> arch/arm/mach-msm/include/mach/gpio.h
> 
> Well, it is not performance critical in any way and it is likely to
> change in future. I'd leave it here.

If this function eventually does do something interesting, it would be
useful to have it as a macro in arch/arm/mach-msm/include/mach/gpio.h
since it can be used for static/define declarations, ie:

#define SOME_GPIO_IRQ gpio_to_irq(SOME_GPIO)

>>> +extern int gpio_to_irq(unsigned gpio);
>> This should probably be an inline as mentioned above.
>>
>> 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.

You should implement this if you have gpio_to_irq because it is part of
the API, see include/linux/gpio.h

~Ryan

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