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