On Sat, Mar 27, 2010 at 08:01:41AM +0100, Ulf Samuelsson wrote:

quoted

I assume that, since I request interrupt on falling edge
the interrupt will not be activated until the target
provides a new falling edge on the interrupt line.

Does your interrupt controller support falling edge IRQs on the I2C
controller?  Most SoCs provide you with only one fixed triggering
method for on-board devices, which is normally only level sensitive.

It is not the I2C interrupt, it is a GPIO interrupt used by the external 
device
indicating it needs service

The problem only occurs when the request_irq is executed in the probe.
I have written a sysfs routine which will do the request_irq, later when I 
get a shell.
With this, rather cumbesome, method, everything seems to work OK.

Best Regards
Ulf Samuelsson