Hi,
Bill Gatliff writes:
> Odd odd odd. :^)
>
> The only combination which seems to work for me is this:
>
> static struct isp116x_platform_data csb625_isp116x_platform_data = {
> .sel15Kres = 1,
> .int_act_high = 0,
> .int_edge_triggered = 0,
> .no_power_switching = 1,
> };
> ...
> set_irq_type(IRQ_GPIO(22), IRQT_FALLING);
>
> I haven't tracked down why yet, but it seems like if I set
> int_edge_triggered or change the polarity of anything around, the PXA
> stops responding to interrupts from the isp1161.
>
> I notice that INT is high on the isp1161 after coming out of reset, so
> that might help explain some of it. But I can't quite tell why the
> edge-sensitivity in set_irq_type isn't working. Could be in the pxa
> code, or could be in the init code for the isp116x.
>
The PXA requires a minimum pulse width of 1 microsecond (Chapter 4-12
of the PXA255 Developers Manual) on a GPIO pin for proper edge
detection. The ISP116x generates a pulse of 167ns in edge triggered
mode. Thus you cannot use the edge triggered mode of the ISP116x with
a PXA processor.
Lothar Wassmann
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