I want to make the GPIO pin assigned to my RTC a falling edge interrupt.
This is what I have done so far:
Defined the pin node
Defined I2C node for the RTC and designated interrupt info
Compile new .dtb and scp the file to the board
Finally, when I execute a ' cat /proc/interrupts' the interrupt always shows up as a level interrupt and never and edge like I defined it to be.
Looking at the datasheet, it appears each pin can be assigned as a high or low level as well as falling or rising edge interrupt.
When I test the interrupt functionality this is what I see:
- Line pulled high no interrupts generated
- Line pulled low, continuous interrupts generated
Can someone point me in the right direction to identify what I am doing wrong or missing here?
Thanks,
Dan
I think I figured out what's going on. I believe the device tree interrupt configuration be overwritten by the device driver.
I am fairly new to embedded Linux applications, but I assume a device driver can overwrite the info the device tree is telling the kernel. Can you confirm?
