Squashed 'dts/upstream/' content from commit aaba2d45dc2a

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diff --git a/Bindings/sound/spdif-receiver.txt b/Bindings/sound/spdif-receiver.txt
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+Device-Tree bindings for dummy spdif receiver
+
+Required properties:
+	- compatible: should be "linux,spdif-dir".
+
+Example node:
+
+	codec: spdif-receiver {
+		compatible = "linux,spdif-dir";
+	};