ubuntu-linux-kernel/Documentation/devicetree/bindings/rtc/rtc-opal.txt

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IBM OPAL real-time clock
------------------------
Required properties:
- compatible: Should be "ibm,opal-rtc"
Optional properties:
- wakeup-source: Decides if the wakeup is supported or not
(Legacy property supported: "has-tpo")
Example:
rtc {
compatible = "ibm,opal-rtc";
wakeup-source;
phandle = <0x10000029>;
linux,phandle = <0x10000029>;
};