RE: TWL4030 keypad timeout interrupt

["Girish" <girishsg@ti.com>]

 
>
>
>On Tue, 13 May 2008 16:54:17 +0300, Felipe Balbi 
><felipe.balbi@nokia.com>
>wrote:
>> Hi all,
>> 
>> I noted whenever we release a key in omap-twl4030.c driver it 
>> generates two interrupts: one for release event and one for 
>a timeout event.
>> 
>> Is that expected or is that a bug somewhere in the driver ?
>> 
>> It's easily noted by cat /proc/interrupts ;-)
>
>Replying to myself as I found some more clues.
>
>By checking the code I could see that only rising edge of 
>timeout interrupt is being enabled. Also timeout register is 
>at 0xd6, but code is writing 0x04...
>

No, the code is writing to 0x00D2 + 0x04 (the t2keypad base address: 0x00D2). 

>So if i read it correctly, we might have 0 set as our timeout.
>
>which might explain why we only see the timeout interrupt when 
>releasing the key.
>
>Am I right ?

Well, the timeout is here to help the controller come out of hangs, if any. 

>
>I might be completely wrong here, but that extra interrupt 
>happening all the time is just bugging me :-p




Regards,
Girish