staging: goldfish: audio: add devicetree bindings

Introduce devicetree bindings to the Goldfish staging audio driver.
Signed-off-by: Greg Hackmann <ghackmann@google.com>
Signed-off-by: Jin Qian <jinqian@android.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/goldfish/audio.txt

+Android Goldfish Audio
+
+Android goldfish audio device generated by android emulator.
+
+Required properties:
+
+- compatible : should contain "google,goldfish-audio" to match emulator
+- reg        : <registers mapping>
+- interrupts : <interrupt mapping>
+
+Example:
+
+	goldfish_audio@9030000 {
+		compatible = "google,goldfish-audio";
+		reg = <0x9030000 0x100>;
+		interrupts = <0x4>;
+	};

drivers/staging/goldfish/goldfish_audio.c

@@ -344,11 +344,18 @@ static int goldfish_audio_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static const struct of_device_id goldfish_audio_of_match[] = {
+	{ .compatible = "google,goldfish-audio", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, goldfish_audio_of_match);
+
 static struct platform_driver goldfish_audio_driver = {
 	.probe		= goldfish_audio_probe,
 	.remove		= goldfish_audio_remove,
 	.driver = {
-		.name = "goldfish_audio"
+		.name = "goldfish_audio",
+		.of_match_table = goldfish_audio_of_match,
 	}
 };