Question about GPIO as interrupt source

[Stefan Wahren]

Hi Noralf,

Am 13.01.2015 um 21:13 schrieb Noralf Tronnes:
> Den 13.01.2015 20:14, skrev Stefan Wahren:
>> Hi,
>>
>> i want to define a GPIO (GPIO23 in my example) as an interrupt source
>> for a SPI device node. I've looked at [1], but after all i still do
>> not known how to define the interrupts property. I know the property
>> must have 2 cells.
>>
>> I don't have a clue, how the mapping between interrupt and GPIO work
>> on the Raspberry Pi.
>>
> Here are two examples of SPI connected touch controllers using gpio irq's:
> https://github.com/notro/fbtft/blob/master/dts/overlays/rpi/rpi-display-overlay.dts#L61
>
> https://github.com/notro/fbtft/blob/master/dts/overlays/rpi/pitft-overlay.dts#L60
>
>
> The files are DT overlays used with the recent support added to the
> VideoCore bootloader:
> http://www.raspberrypi.org/forums/viewtopic.php?f=29&t=93015
> For the curious, this DT kernel is still using ARCH_BCM2708, but
> ARCH_BCM2835 is now finally within view.
>

thanks. I forgot the interrupt parent and now it's working.

Stefan

>
> Regards,
> Noralf Trønnes
>