the second encodes the triger flags encoded as described in
Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
- interrupt-parent : The parent interrupt controller.
-- interrupts : The interrupt to the parent controller raised when GPIOs
- generate the interrupts.
+- interrupts : The interrupts to the parent controller raised when GPIOs
+ generate the interrupts. If the controller provides one combined interrupt
+ for all GPIOs, specify a single interrupt. If the controller provides one
+ interrupt for each GPIO, provide a list of interrupts that correspond to each
+ of the GPIO pins. When specifying multiple interrupts, if any are unconnected,
+ use the interrupts-extended property to specify the interrupts and set the
+ interrupt controller handle for unused interrupts to 0.
- snps,nr-gpios : The number of pins in the port, a single cell.
- resets : Reset line for the controller.