Squashed 'dts/upstream/' content from commit aaba2d45dc2a

git-subtree-dir: dts/upstream
git-subtree-split: aaba2d45dc2a1b3bbb710f2a3808ee1c9f340abe
diff --git a/Bindings/rtc/rtc-opal.txt b/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>;
+	};