How to declare a single GPIO-Pin which is not an LED in boards dts file?

[xmoex]

We have a few GPIO Outputs we'd like to configure via device tree. However in all the examples found the output GPIOs are compatible="gpio-leds".

Those pins are necessary to communicate with another Chip so we'd rather not use the gpio-leds interface.

This is what we have so far:

pins {
      // Todo don't use gpio-leds
      compatible = "gpio-leds";
      pin0: pin0 {
          gpios = <&gpio0 13 GPIO_ACTIVE_LOW>;
          label = "Signal pin";
      };
};

This is what we had in mind:

pins {
      compatible = "gpio"; // sort of
      pin0: pin0 {
          gpios = <&gpio0 13 GPIO_ACTIVE_LOW>;
          label = "Signal pin";
      };
};

[Øivind]

Hi,

You should be able to control a gpio with gpio-leds by using the gpio API.

Look at how the led is handled in zephyr/samples/basic/button. It is just an output GPIO that happens to be connected to an LED.

Are you having any issues replicating that with the gpio-leds node you posted?

[xmoex]

No issue here, controlling the pins works fine. I just wasn't sure if accessing the Pins via gpio-leds was the "right" way to do it...

[longo92]

I resuming this post in order to know if someone know a method. I get bored seeing that I have to use something led-retaled to control a mosfet.

[zsn]

I would create a yaml file call, for example, gpio-outputs.yaml. and copy gpio-leds.yaml context into it and modify

# Copyright (c) 2018, Linaro Limited
# SPDX-License-Identifier: Apache-2.0

compatible: "gpio-outputs"

child-binding:
    description: GPIO output child node
    properties:
       gpios:
          type: phandle-array
          required: true
       label:
          required: false
          type: string
          description: |
            Human readable string describing the pin. It can be used by an
            application to identify this pin or to retrieve its number/index
            (i.e. child node number) on the parent device.

and you can copy this file either into your project/boards/bindings or zephyr/dts/bindings/gpio. Both will work.

if you copy into your project it will be valid for only that project, but if you copy into zephyr/dts then you can use it for all your project