ASoC: hisilicon: Add hi6210 i2s audio driver

Add driver for hi6210 i2s controller found on hi6220 boards.
Signed-off-by: Andy Green <andy.green@linaro.org>
[jstultz: Forward ported to mainline, fairly major rework
 based on suggestions from Mark Brown]
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/Kconfig

@@ -47,6 +47,7 @@ source "sound/soc/cirrus/Kconfig"
 source "sound/soc/davinci/Kconfig"
 source "sound/soc/dwc/Kconfig"
 source "sound/soc/fsl/Kconfig"
+source "sound/soc/hisilicon/Kconfig"
 source "sound/soc/jz4740/Kconfig"
 source "sound/soc/nuc900/Kconfig"
 source "sound/soc/omap/Kconfig"

sound/soc/Makefile

@@ -27,6 +27,7 @@ obj-$(CONFIG_SND_SOC)	+= cirrus/
 obj-$(CONFIG_SND_SOC)	+= davinci/
 obj-$(CONFIG_SND_SOC)	+= dwc/
 obj-$(CONFIG_SND_SOC)	+= fsl/
+obj-$(CONFIG_SND_SOC)	+= hisilicon/
 obj-$(CONFIG_SND_SOC)	+= jz4740/
 obj-$(CONFIG_SND_SOC)	+= img/
 obj-$(CONFIG_SND_SOC)	+= intel/

sound/soc/hisilicon/Kconfig

+config SND_I2S_HI6210_I2S
+	tristate "Hisilicon I2S controller"
+	select SND_SOC_GENERIC_DMAENGINE_PCM
+	help
+	  Hisilicon I2S

sound/soc/hisilicon/Makefile

+obj-$(CONFIG_SND_I2S_HI6210_I2S) += hi6210-i2s.o