ASoC: imx: add an explicit Kconfig option for imx-ssi driver

Currently ASoC:imx uses menuconfig option SND_IMX_SOC selects imx-ssi
driver, and it works because all the machine driver covered by the
menuconfig need to build imx-ssi driver in.  However, it will not work
any more if we have a imx based machine driver going into the menuconfig
while working with fsl_ssi driver (sound/soc/fsl/fsl_ssi.c) rather than
imx-ssi one.

The patch adds an explicit Kconfig option SND_SOC_IMX_SSI for imx-ssi
driver, so that it can be selected independently from the menuconfig
option SND_IMX_SOC.
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/imx/Kconfig

@@ -8,6 +8,9 @@ menuconfig SND_IMX_SOC
 
 if SND_IMX_SOC
 
+config SND_SOC_IMX_SSI
+	tristate
+
 config SND_SOC_IMX_PCM
 	tristate
 
@@ -30,6 +33,7 @@ config SND_MXC_SOC_WM1133_EV1
 	select SND_SOC_WM8350
 	select SND_MXC_SOC_FIQ
 	select SND_SOC_IMX_AUDMUX
+	select SND_SOC_IMX_SSI
 	help
 	  Enable support for audio on the i.MX31ADS with the WM1133-EV1
 	  PMIC board with WM8835x fitted.
@@ -40,6 +44,7 @@ config SND_SOC_MX27VIS_AIC32X4
 	select SND_SOC_TLV320AIC32X4
 	select SND_MXC_SOC_MX2
 	select SND_SOC_IMX_AUDMUX
+	select SND_SOC_IMX_SSI
 	help
 	  Say Y if you want to add support for SoC audio on Visstrim SM10
 	  board with TLV320AIC32X4 codec.
@@ -51,6 +56,7 @@ config SND_SOC_PHYCORE_AC97
 	select SND_SOC_WM9712
 	select SND_MXC_SOC_FIQ
 	select SND_SOC_IMX_AUDMUX
+	select SND_SOC_IMX_SSI
 	help
 	  Say Y if you want to add support for SoC audio on Phytec phyCORE
 	  and phyCARD boards in AC97 mode
@@ -65,6 +71,7 @@ config SND_SOC_EUKREA_TLV320
 	select SND_SOC_TLV320AIC23
 	select SND_MXC_SOC_FIQ
 	select SND_SOC_IMX_AUDMUX
+	select SND_SOC_IMX_SSI
 	help
 	  Enable I2S based access to the TLV320AIC23B codec attached
 	  to the SSI interface

sound/soc/imx/Makefile

 # i.MX Platform Support
-snd-soc-imx-objs := imx-ssi.o
+snd-soc-imx-ssi-objs := imx-ssi.o
 snd-soc-imx-audmux-objs := imx-audmux.o
 
-obj-$(CONFIG_SND_IMX_SOC) += snd-soc-imx.o
+obj-$(CONFIG_SND_SOC_IMX_SSI) += snd-soc-imx-ssi.o
 obj-$(CONFIG_SND_SOC_IMX_AUDMUX) += snd-soc-imx-audmux.o
 
 obj-$(CONFIG_SND_SOC_IMX_PCM) += snd-soc-imx-pcm.o