On 27 November 2012 14:10, Lee Jones [off-list ref] wrote:

On Tue, 27 Nov 2012, Viresh Kumar wrote:

quoted

Problem is with invert polarity, which the interrupt controller is not aware of.
For example, suppose interrupt controller needs Rising edge interrupt, but
the board has inverted the line between stmpe and IC. So, we will get
Rising high from the routine you mentioned, but we need to generate
opposite of that to make it rising high.

Surely that would be a hardware design error/quirk?

Yes.

Can you give an example where this has happened?

I haven't seen this in any of SPEAr boards i have worked on. Maybe Rabin
would have, that's why he added that part of code :)

@Rabin/Linus: Do you remember why have you added this in stmpe driver:

+       if (stmpe->pdata->irq_invert_polarity)
+               icr ^= STMPE_ICR_LSB_HIGH;
+

Does somebody actually need it?

--
viresh