On Mon, Feb 29, 2016 at 12:13:26AM +0100, Henry Paulissen wrote: > While I was testing irq's on the cubietruck I found a couple of > not working irq pins. Further diving into the problem it opened > up a mess called "manual". > > This so called manual (A20 user manual v1.3 dated 2014-10-10) says: > > Pin overview: > Page 233: EINT12 is on pin PC19 mux6. > Page 236: EINT12 is on pin PH12 mux6. > > Now, it is a bit strange to have the same IRQ on 2 different pins, > but I guess this could still be possible hardware wise. But then: > > Pin registers: > Page 253: EINT12 is *not* on pin PC19. > Page 281: EINT12 is on pin PH12. > > The manual is so contradicting that further tests had to be made > to see which of the 2 statements where correct. > > This patch is based on actual outcome of these tests and not what > the manual says. > > Test procedure used: > > Connect a 1 pulse per second (GPS) line to the pin. > > echo pin### > /sys/class/gpio/export > echo in > /sys/class/gpio/gpio###/direction > echo rising > /sys/class/gpio/gpio###/edge > > Check /proc/interrupts if a irq was attached and if irq's where > received. > > Signed-off-by: Henry Paulissen <henry@xxxxxxxxxxxxxxxx> Acked-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx> Thanks! Maxime -- Maxime Ripard, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com
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