Hi, I have an ODYSSEY X86J4105, my use case is, I need to enable a PPS signal connected on a GPIO pin (phys pin 13 in the example), and for this I need to use GPIO IRQs.
I’ve run onto a dead end, I wrote a kernel module to enable a pps-gpio device using a GPIO as IRQ, which in turn is probed and detected by module pps-gpio pps client, and in turn registers it as a PPS source.
All of this works fine in other hardware, like raspberry PI (note that I’m avoiding the device tree to avoid incompatibilities).
I’m running Ubuntu 20.04, after trying to find out what was wrong with my code, I decided to give it a go using gpio tools, and tried with gpiomon which also binds a GPIO to an IRQ to monitor… and I got the same results.
As I said, in this example I’m using pin 13, but have tried other GPIOs. Same result.
Command:
$ gpiomon -f 1 60
gpiomon: error waiting for events: Operation not permitted
And this is logged:
==> /var/log/kern.log <==
Jun 17 02:46:45 tywin kernel: [ 8802.486251] geminilake-pinctrl INT3453:01: pin 60 cannot be used as IRQ
Jun 17 02:46:45 tywin kernel: [ 8802.486262] genirq: Setting trigger mode 2 for irq 153 failed (intel_gpio_irq_type+0x0/0x130 [pinctrl_intel])
The exact same effect/result as my code.
My conclusion is that there’s no IRQ support for GPIOs in the BIOS for interrupt requests (I saw the example labelled IRQ in https://wiki.seeedstudio.com/ODYSSEY-X86J4105-GPIO/#interrupts but that’s not using IRQs, it’s actually polling sysfs).
Is there any BIOS updates, or anyway to enable IRQs in this board?
I’ve found nothing useful or related in current BIOS settings.
Appreciate any help!
Regards,
GM
