Hello, I'm trying to use a GPIO as an interrupt on an mt7620 (using OpenWRT drivers) and I can't seem to figure out how to glue my two-celled interrupt description (including the trigger) to the device tree code. This is the gpio driver I'm using: https://github.com/openwrt/openwrt/blob/master/target/linux/ramips/patches-4.14/0027-GPIO-MIPS-ralink-add-gpio-driver-for-ralink-SoC.patch And this is the gpio chip in the device tree: gpio0: gpio@600 { compatible = "ralink,mt7620a-gpio", "ralink,rt2880-gpio"; reg = <0x600 0x34>; resets = <&rstctrl 13>; reset-names = "pio"; interrupt-parent = <&intc>; interrupts = <6>; interrupt-controller; #interrupt-cells = <2>; gpio-controller; #gpio-cells = <2>; ralink,gpio-base = <0>; ralink,num-gpios = <24>; ralink,register-map = [ 00 04 08 0c 20 24 28 2c 30 34 ]; }; I've added the "interrupt-controller;" and "#interrupt-cells" myself. This is my i2c device: &i2c { status = "okay"; imu: lsm6ds3@6b { compatible = "st,lsm6ds3"; reg = <0x6b>; interrupt-parent = <&gpio0>; interrupts = <14 IRQ_TYPE_EDGE_FALLING>; }; }; The problem is that when the driver probes and asks what the trigger for the irq is, it returns zero instead of 2 (IRQ_TYPE_EDGE_FALLING). I presume this is because the two-celled interrupts aren't implemented by the gpio driver? Documentation/devicetree/bindings/interrupt-controller/interrupts.txt says: A device is marked as an interrupt controller with the "interrupt-controller" property. This is a empty, boolean property. An additional "#interrupt-cells" property defines the number of cells needed to specify a single interrupt. It is the responsibility of the interrupt controller's binding to define the length and format of the interrupt specifier. The following two variants are commonly used: ... However, I'm having great trouble finding documentation on how to write these bindings. Can anybody give me a pointer please? Thanks, Daniel
