Custom DTS child node unknown node type

[Nick_RA]

I want to add custom outputs to my custom board dts: this thread mirrors exactly what I'm doing:

https://devzone.nordicsemi.com/f/nordic-q-a/92813/how-to-declare-a-single-gpio-pin-which-is-not-an-led-in-boards-dts-file/419238

The advice was as below. So after creating the bindings file I try to add a "compatible=" line to my child node in my DTS file and I get "unknown node type gpio-outputs". If I use the helper in VCS (CTRL-Space) then my node doesn't appear in the list.

Tried saving in my board or board/bindings directories but It will only work if I save my yaml file in my NCS directoty C:\ncs\v2.9.0\zephyr\dts\bindings\gpio which I don't want to do.

Do I have to add an explicit path when I want to use it? That would seem a bit odd.

zsn said:

I would create a yaml file call, for example, gpio-outputs.yaml. and copy gpio-leds.yaml context into it and modify and you can copy this file either into your project/boards/bindings or zephyr/dts/bindings/gpio. Both will work.

# 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.

[Vidar Berg]

Hello,

It is explained here where the build system will look for bindings: https://docs.zephyrproject.org/latest/build/dts/bindings-intro.html#where-bindings-are-located.  

in my board or board/bindings directories

I haven't tried placing it in the boards directory, but I believe it should still be boards/dts/bindings/gpio/<your binding>.yaml 

If you just need to control some pins directly from the application without using a driver that follows the zephyr driver model, you may also consider just using the /zephyr,user node. Then you will not have to define a custom binding.

Best regards,

Vidar

Example applications including custom DT bindings:

- https://github.com/nrfconnect/ncs-example-application 

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