Configure custom I/O in the devicetree

[john.liu]

Hi:

I want to configure an IO, but I don't find the label.

[rbmarcus]

The labels used for the LEDs are properties. 

The text view of the DeviceTree resolves some of the ambiguity:

/ {
	model = "Nordic nRF52840 DK NRF52840";
	compatible = "nordic,nrf52840-dk-nrf52840";
...
	leds {
		compatible = "gpio-leds";
		led0: led_0 {
			gpios = <&gpio0 13 GPIO_ACTIVE_LOW>;
			label = "Green LED 0";
		};
		led1: led_1 {
			gpios = <&gpio0 14 GPIO_ACTIVE_LOW>;
			label = "Green LED 1";
		};
		led2: led_2 {
			gpios = <&gpio0 15 GPIO_ACTIVE_LOW>;
			label = "Green LED 2";
		};
		led3: led_3 {
			gpios = <&gpio0 16 GPIO_ACTIVE_LOW>;
			label = "Green LED 3";
		};
	};
...

Although, I'm pretty sure you don't need either type of label to configure a GPIO.

[john.liu]

Hi:

After I configure it like this:

    sim: sim-pin {

        gpios = <&gpio0 10 0>;

        label = "sim pin";      

    };

But after this configuration, I can't see sim pin.

[Einar Thorsrud]

Hi,

Thank you for the feedback. I have forwarded it internally so that we can look at how labels are supported on generic GPIO pins.