How-to: Uniquely identify a DT node in the driver?

[Lina Iyer <lina.iyer-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>]

Hello,

I am looking to find a way to uniquely identify a device in the driver.
Here is an example -

	big: power-controller@1 {
		compatible = "soc,foo";
		...
	};

	little: power-controller@2 {
		compatible = "soc,foo";
		...
	};


In the driver for the power-controller foo.c, would like to do -

	struct xyz {
		const char *name;
		...
	};

	static struct xyz a = {
		.name = "big"; // To be associated with big device
		...
	};

	static struct xyz b = {
		.name = "little"; // To be associated with little device
		...
	};

What would be the best way to associate the power-controller devices 'big'
and 'little' with 'a' and 'b' respectively? A string comparison would be
ideal but possibly can work with other ways.

I could think of adding compatibles to achieve this, but was hoping to
find something more elegant and appropriate. Or, is compatible the
recommended way to uniquely identify devices by the driver?

Thanks,
Lina
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