I've an am335x-based board with tca6416. OS: Linux with kernel 3.14. The
interrupt output of the
tca6416 is connected to GPIO0_20 on my SoC. How should I configure this
wiring in a device tree file?
I've already managed to hook it on I2C and it is working so far:
tca6416: gpio@20 {
compatible = "ti,tca6416";
reg = <0x20>;
gpio-controller;
#gpio-cells = <2>;
};
Documentation/devicetree/bindings/gpio/gpio-pcf857x.txt describes
following properties:
- interrupt-controller: Identifies the node as an interrupt controller.
- #interrupt-cells: Number of cells to encode an interrupt source, shall
be 2.
- interrupt-parent: phandle of the parent interrupt controller.
- interrupts: Interrupt specifier for the controllers interrupt.
and following example:
pcf8575: gpio@20 {
compatible = "nxp,pcf8575";
reg = <0x20>;
interrupt-parent = <&irqpin2>;
interrupts = <3 0>;
gpio-controller;
#gpio-cells = <2>;
interrupt-controller;
#interrupt-cells = <2>;
};
Where does irqpin2 come from? How to specify GPIO0_20 in "interrupts"
context?
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