TX2 TCA9539 GPIO Interrupt

Robotics & Edge Computing Jetson & Embedded Systems Jetson TX2
1

Hi, kind NVIDIA and everyone!
Please tell me how could I process the GPIO input interrupt from TCA9539(U28 of Jetson-TX2 kit)'s P01 input pin at my custom .so program.

Q1: I think that I have to make DTB as below:

//gen7_i2c: i2c@31c0000
i2c@31c0000 {
	gpio_i2c_6_74: gpio@74 {
		compatible = "ti,tca9539";
		reg = <0x74>;
		gpio-controller;
		#gpio-cells = <2>;
		vcc-supply = <&battery_reg>;
			
		interrupt-parent = <&gpio0>;
		interrupts = <99 IRQ_TYPE_EDGE_BOTH>;
		#interrupt-cells = <2>;
		interrupt-controller;
	};

But, I don’t know how write the “interrupt-parent” and “interrupts”
Q2: As above without “interrupt”, I could test GPIO input using gpio-fs.
But at this time, the “gpio240/edge” file was not generated.
Please tell me the reason and my mistake.
Q3: After I make DTB successfully, how can I get the interrupt signal at my .so program?

Thanks,
Regards, aither.

2

hello 3273977271,

please refer to Tegra Linux Driver Package TX1 Adaptation Guide, check page.12 for the GPIO interrupt reference.
thanks