ASoC: add ep93xx AC97 audio driver

Add support for AC97 controllers found in Cirrus Logic EP93xx family SoCs.
Signed-off-by: Mika Westerberg <mika.westerberg@iki.fi>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/ep93xx/Kconfig

@@ -3,11 +3,16 @@ config SND_EP93XX_SOC
 	depends on ARCH_EP93XX && SND_SOC
 	help
 	  Say Y or M if you want to add support for codecs attached to
-	  the EP93xx I2S interface.
+	  the EP93xx I2S or AC97 interfaces.
 
 config SND_EP93XX_SOC_I2S
 	tristate
 
+config SND_EP93XX_SOC_AC97
+	tristate
+	select AC97_BUS
+	select SND_SOC_AC97_BUS
+
 config SND_EP93XX_SOC_SNAPPERCL15
         tristate "SoC Audio support for Bluewater Systems Snapper CL15 module"
         depends on SND_EP93XX_SOC && MACH_SNAPPER_CL15

sound/soc/ep93xx/Makefile

 # EP93xx Platform Support
 snd-soc-ep93xx-objs				:= ep93xx-pcm.o
 snd-soc-ep93xx-i2s-objs	 			:= ep93xx-i2s.o
+snd-soc-ep93xx-ac97-objs 			:= ep93xx-ac97.o
 
 obj-$(CONFIG_SND_EP93XX_SOC)			+= snd-soc-ep93xx.o
 obj-$(CONFIG_SND_EP93XX_SOC_I2S)		+= snd-soc-ep93xx-i2s.o
+obj-$(CONFIG_SND_EP93XX_SOC_AC97)		+= snd-soc-ep93xx-ac97.o
 
 # EP93XX Machine Support
 snd-soc-snappercl15-objs			:= snappercl15.o