[PATCH] arm pxa: remove "direction input" forcing for IRQ GPIOs

[Eric Miao]

On Tue, Nov 17, 2009 at 6:05 AM, Rodolfo Giometti <giometti at enneenne.com> wrote:
> On Tue, Nov 17, 2009 at 12:44:29PM +0100, Daniel Mack wrote:
>> On Tue, Nov 17, 2009 at 12:21:46PM +0100, Rodolfo Giometti wrote:
>> > PXA CPUs may use their GPIOs as IRQ lines even if they are selected as
>> > outputs (see for example figure 24-1 into PXA27x Processor Family
>> > Developer's Manual). So forcing GPIOs IRQ lines as inputs is not
>> > correct.
>> >
>> > Programmers should set up GPIOs direction according to their usage and
>> > the function pxa_gpio_irq_type() should simply enable the IRQ
>> > detection.
>>
>> Interesting. Is this an academic issue or do you actually use that?
>> That would mean you externally drive the IO pin level to something else
>> than the output driver provides, which isn't healthy at all.
>
> It's a real configuration with no electrical drawbacks at all! Of
> course the driver's output must be passive (I use it to detect a CARD
> insert) but it's functional.

Well, that might be possible configuration but as long as there is no
real issue with this, I'd prefer the safe guard here remain intact atm.