I am developing an application under Zephyr RTOS that has a few similar illuminance sensors. I have added a few child nodes to the I²C node like this:

&i2c21 {
    status = "okay";
    pinctrl-names = "default", "sleep";

    opt3001_0: opt3001_0@46 {
        compatible = "ti,opt3001";
        reg = <0x46>;
        status = "okay";
    };
    opt3001_1: opt3001_1@47 {
        compatible = "ti,opt3001";
        reg = <0x47>;
        status = "okay";
    };
};

I can access the sensors in my code using the DEVICE_DT_GET() and DT_NODELABEL() macros. But now I want to do it in a more "high level" way, using aliases. So my code will use the illuminance-sensor alias instead of opt3001_0 and opt3001_1 node labels. So in the future, I would be able to change the senor (or a number of sensors) without changing the code. I want the alias to do something like this:

/ {
    aliases {
        illuminance-sensor = &opt3001_0, &opt3001_1;
    };
};

But the problem is that the devicetree compiler throws the error:

"All properties in aliases must be singular".

What is the best way to reference a few nodes through a single alias?

I am expecting to use a single alias to use one or multiple sensors in code without using node labels.

I am developing an application under Zephyr RTOS that has a few similar illuminance sensors. I have added a few child nodes to the I²C node like this:

&i2c21 {
    status = "okay";
    pinctrl-names = "default", "sleep";

    opt3001_0: opt3001_0@46 {
        compatible = "ti,opt3001";
        reg = <0x46>;
        status = "okay";
    };
    opt3001_1: opt3001_1@47 {
        compatible = "ti,opt3001";
        reg = <0x47>;
        status = "okay";
    };
};

I can access the sensors in my code using the DEVICE_DT_GET() and DT_NODELABEL() macros. But now I want to do it in a more "high level" way, using aliases. So my code will use the illuminance-sensor alias instead of opt3001_0 and opt3001_1 node labels. So in the future, I would be able to change the senor (or a number of sensors) without changing the code. I want the alias to do something like this:

/ {
    aliases {
        illuminance-sensor = &opt3001_0, &opt3001_1;
    };
};

But the problem is that the devicetree compiler throws the error:

"All properties in aliases must be singular".

What is the best way to reference a few nodes through a single alias?

I am expecting to use a single alias to use one or multiple sensors in code without using node labels.

• device-tree
• zephyr-rtos
• nrf-connect

• "What is the best way to reference a few nodes through a single alias?" - There's no "best way" simply because there is no way possible. The alias can refer to only one node. This is an XY problem that has no solution for Y. – sawdust Commented Jan 31 at 0:18
• You are right. Alias was not suitable for my needs. I was experimenting with it and the best I could do was creating an alias to a node, that has a property with phandles. – Dmitry Ses Commented Jan 31 at 15:12

1 Answer 1

You can do this with the zephyr,user devicetree node. See:

Devices