ASoC: cros_ec_codec: Add codec driver for Cros EC

Add a codec driver to control ChromeOS EC codec.

Use EC Host command to enable/disable I2S recording and control other
configurations.
Signed-off-by: Cheng-Yi Chiang <cychiang@chromium.org>
Reviewed-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

MAINTAINERS

@@ -3693,6 +3693,7 @@ S:	Maintained
 R:	Enric Balletbo i Serra <enric.balletbo@collabora.com>
 R:	Guenter Roeck <groeck@chromium.org>
 F:	Documentation/devicetree/bindings/sound/google,cros-ec-codec.txt
+F:	sound/soc/codecs/cros_ec_codec.*
 
 CIRRUS LOGIC AUDIO CODEC DRIVERS
 M:	Brian Austin <brian.austin@cirrus.com>

sound/soc/codecs/Kconfig

@@ -50,6 +50,7 @@ config SND_SOC_ALL_CODECS
 	select SND_SOC_BT_SCO
 	select SND_SOC_BD28623
 	select SND_SOC_CQ0093VC
+	select SND_SOC_CROS_EC_CODEC if MFD_CROS_EC
 	select SND_SOC_CS35L32 if I2C
 	select SND_SOC_CS35L33 if I2C
 	select SND_SOC_CS35L34 if I2C
@@ -459,6 +460,13 @@ config SND_SOC_CPCAP
 config SND_SOC_CQ0093VC
 	tristate
 
+config SND_SOC_CROS_EC_CODEC
+	tristate "codec driver for ChromeOS EC"
+	depends on MFD_CROS_EC
+	help
+	  If you say yes here you will get support for the
+	  ChromeOS Embedded Controller's Audio Codec.
+
 config SND_SOC_CS35L32
 	tristate "Cirrus Logic CS35L32 CODEC"
 	depends on I2C

sound/soc/codecs/Makefile

@@ -42,6 +42,7 @@ snd-soc-bd28623-objs := bd28623.o
 snd-soc-bt-sco-objs := bt-sco.o
 snd-soc-cpcap-objs := cpcap.o
 snd-soc-cq93vc-objs := cq93vc.o
+snd-soc-cros-ec-codec-objs := cros_ec_codec.o
 snd-soc-cs35l32-objs := cs35l32.o
 snd-soc-cs35l33-objs := cs35l33.o
 snd-soc-cs35l34-objs := cs35l34.o
@@ -312,6 +313,7 @@ obj-$(CONFIG_SND_SOC_BD28623)	+= snd-soc-bd28623.o
 obj-$(CONFIG_SND_SOC_BT_SCO)	+= snd-soc-bt-sco.o
 obj-$(CONFIG_SND_SOC_CQ0093VC) += snd-soc-cq93vc.o
 obj-$(CONFIG_SND_SOC_CPCAP)	+= snd-soc-cpcap.o
+obj-$(CONFIG_SND_SOC_CROS_EC_CODEC)	+= snd-soc-cros-ec-codec.o
 obj-$(CONFIG_SND_SOC_CS35L32)	+= snd-soc-cs35l32.o
 obj-$(CONFIG_SND_SOC_CS35L33)	+= snd-soc-cs35l33.o
 obj-$(CONFIG_SND_SOC_CS35L34)	+= snd-soc-cs35l34.o