ASoC: new ad1938 codec driver based on asoc

Signed-off-by: Barry Song <21cnbao@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index 4219a41..57f5b73 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -12,6 +12,7 @@
 	tristate "Build all ASoC CODEC drivers"
 	select SND_SOC_L3
 	select SND_SOC_AC97_CODEC if SND_SOC_AC97_BUS
+	select SND_SOC_AD1938 if SPI_MASTER
 	select SND_SOC_AD1980 if SND_SOC_AC97_BUS
 	select SND_SOC_AD73311 if I2C
 	select SND_SOC_AK4104 if SPI_MASTER
@@ -66,6 +67,9 @@
 	tristate
 	select SND_AC97_CODEC
 
+config SND_SOC_AD1938
+	tristate
+
 config SND_SOC_AD1980
 	tristate