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

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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";
};
...
...
};