Re: [PATCH 1/2] pinctrl: sunxi: Remove non existing irq's
From: Maxime Ripard
Date: Mon Feb 29 2016 - 23:43:37 EST
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
> Signed-off-by: Henry Paulissen <henry@xxxxxxxxxxxxxxxx>
Acked-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx>
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
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