linux-libre/Documentation/devicetree/bindings/leds/leds-powernv.txt

Device Tree binding for LEDs on IBM Power Systems
-------------------------------------------------

Required properties:
- compatible : Should be "ibm,opal-v3-led".
- led-mode   : Should be "lightpath" or "guidinglight".

Each location code of FRU/Enclosure must be expressed in the
form of a sub-node.

Required properties for the sub nodes:
- led-types : Supported LED types (attention/identify/fault) provided
              in the form of string array.

Example:

leds {
	compatible = "ibm,opal-v3-led";
	led-mode = "lightpath";

	U78C9.001.RST0027-P1-C1 {
		led-types = "identify", "fault";
	};
	...
	...
};