ASoC: Add ssm2518 support

This patch adds a ASoC CODEC driver for the SSM2516. The SSM2516 is a stereo
Class-D audio amplifier with an I2S interface for audio in and a built-in
dynamic range control processor.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/codecs/ssm2518.h b/sound/soc/codecs/ssm2518.h
new file mode 100644
index 0000000..62511d8
--- /dev/null
+++ b/sound/soc/codecs/ssm2518.h
@@ -0,0 +1,20 @@
+/*
+ * SSM2518 amplifier audio driver
+ *
+ * Copyright 2013 Analog Devices Inc.
+ *  Author: Lars-Peter Clausen <lars@metafoo.de>
+ *
+ * Licensed under the GPL-2.
+ */
+
+#ifndef __SND_SOC_CODECS_SSM2518_H__
+#define __SND_SOC_CODECS_SSM2518_H__
+
+#define SSM2518_SYSCLK 0
+
+enum ssm2518_sysclk_src {
+	SSM2518_SYSCLK_SRC_MCLK = 0,
+	SSM2518_SYSCLK_SRC_BCLK = 1,
+};
+
+#endif