How to enable kernel IRQ?

[dzhou]

Hi Robert,

I have two questions:

1. under /sys/kernel/irq, there are many numbers exported. For example, 20
   I tried to enable wakeup, I got permission denied:

2. For GPIO_20, is that related to /sys/kernel/irq/20? But under ./irq/20, the hwirq number is 12.
   If there is a relationship between them, how are they associated with between the numbers?

Thank You,

David

[RobertCNelson]

@dzhou

For GPIO_20, is that related to /sys/kernel/irq/20? But under ./irq/20, the hwirq number is 12.
If there is a relationship between them, how are they associated with between the numbers?

In Linux, IRQ’s are dynamically allocated… Use /proc/interrupts to map number to peripheral…

Regards,

[dzhou]

Thank you.
David