Is it possible to reference a devicetree alias elsewhere in the devicetree?

[jeremyherbert]

Hi,

I have a custom device driver that I initialise like this:

/ {
  my_device: my_device {
    compatible = "someone,something";
    label = "My Device";
    base-uart = < &uart0 >
  }
};

This works fine. I'd like to change base-uart phandle to refer to an alias rather than a device directly. Is this possible? Currently I have tried:

/ {
  alias {
    my_uart = &uart0;
  };

  my_device: my_device {
    compatible = "someone,something";
    label = "My Device";
    base-uart = < &my_uart >
  }
};

But I get a devicetree error: undefined node label 'my_uart'.

Any help would be appreciated!

[jeremyherbert]

I found my answer: https://elinux.org/Device_Tree_Mysteries#Label_vs_aliases_node_property

The working way to do this is:

my_uart: &uart0 {};

/ {
  my_device: my_device {
    compatible = "someone,something";
    label = "My Device";
    base-uart = < &my_uart >
  }
};