devicetree error: ... /library_sdk/boards/arm/nrf52840_custom/nrf52840_custom.dts:152 (column 14): parse error: malformed value

[nRF5xFanboy]

Hello Community / Nordic

How can I have a boolean property in my mp2723 device driver  devicetree dts or overlay.

I am using NCS v2.2.0 in MS Windows 11 with VSCode  1.17.2

Zephyr says:

Get a devicetree property value.

For properties whose bindings have the following types, this macro expands to:

- string: a string literal
- boolean: 0 if the property is false, or 1 if it is true
- int: the property's value as an integer literal
- array, uint8-array, string-array: an initializer expression in braces, whose elements are integer or string literals (like {0, 1, 2}, {"hello", "world"}, etc.)
- phandle: a node identifier for the node with that phandle

my mp,mp2723.yaml file:
the boolean property

  NTC_type:
    type: boolean
    required: false
    description: Select standard (false) and JEITA (true) battery temperature monitoring (in false|true)

I did try the following (but each time I got a compiler error)

NTCtype = false;
NTCtype = "false";
NTCtype = <0>;

Any advise or tips on how to handle the boolean property for the custom device driver
and/or the correct format is most welcome.

[Øivind]

Hi,

You set a boolean property to true by including it in the devicetree node. For example:

mp2723: mp2723@0 {
    compatible = "mp,mp2723";
    reg = <0>;
    
    NTC_type;
};

If the boolean is set to true in a board file and you would like to set it to false in an overlay, you can delete the property in the overlay:

&mp2723 {
    /delete-property/ NTC_type;
};

[nRF5xFanboy]

Hi Øivind,

Thanks, I did discovered the same while browsing through some examples
The zephyr website was not very clear on this.

Thanks