ASoC: TWL4030: Add supply for audio serial interface control

The serial interface (TDM/I2S) for the audio block have been
constantly enabled.
Introduce a new DAPM_SUPPLY for handling the AIF_EN bit, so
the interface is only enabled, when there is a need for it.
For example when only the analog loopback is enabled, there
is no need to keep the serial interface active.

I have added the persons who contributed to the Voice path
of twl4030 codec driver, so they might have the ability
to test this patch, and send an update for the Voice path,
if it is necessary

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@nokia.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/twl4030.c

@@ -55,7 +55,7 @@ static const u8 twl4030_reg[TWL4030_CACHEREGNUM] = {
 	0x0c, /* REG_ATXR1PGA		(0xB)	*/
 	0x00, /* REG_AVTXL2PGA		(0xC)	*/
 	0x00, /* REG_AVTXR2PGA		(0xD)	*/
-	0x01, /* REG_AUDIO_IF		(0xE)	*/
+	0x00, /* REG_AUDIO_IF		(0xE)	*/
 	0x00, /* REG_VOICE_IF		(0xF)	*/
 	0x00, /* REG_ARXR1PGA		(0x10)	*/
 	0x00, /* REG_ARXL1PGA		(0x11)	*/
@@ -1203,6 +1203,8 @@ static const struct snd_soc_dapm_widget twl4030_dapm_widgets[] = {
 	SND_SOC_DAPM_SUPPLY("APLL Enable", SND_SOC_NOPM, 0, 0, apll_event,
 			    SND_SOC_DAPM_PRE_PMU|SND_SOC_DAPM_POST_PMD),
 
+	SND_SOC_DAPM_SUPPLY("AIF Enable", TWL4030_REG_AUDIO_IF, 0, 0, NULL, 0),
+
 	/* Output MIXER controls */
 	/* Earpiece */
 	SND_SOC_DAPM_MIXER("Earpiece Mixer", SND_SOC_NOPM, 0, 0,
@@ -1337,6 +1339,11 @@ static const struct snd_soc_dapm_route intercon[] = {
 	{"Digital L2 Playback Mixer", NULL, "APLL Enable"},
 	{"Digital Voice Playback Mixer", NULL, "APLL Enable"},
 
+	{"Digital R1 Playback Mixer", NULL, "AIF Enable"},
+	{"Digital L1 Playback Mixer", NULL, "AIF Enable"},
+	{"Digital R2 Playback Mixer", NULL, "AIF Enable"},
+	{"Digital L2 Playback Mixer", NULL, "AIF Enable"},
+
 	{"Analog L1 Playback Mixer", NULL, "Digital L1 Playback Mixer"},
 	{"Analog R1 Playback Mixer", NULL, "Digital R1 Playback Mixer"},
 	{"Analog L2 Playback Mixer", NULL, "Digital L2 Playback Mixer"},
@@ -1455,6 +1462,11 @@ static const struct snd_soc_dapm_route intercon[] = {
 	{"ADC Virtual Left2", NULL, "APLL Enable"},
 	{"ADC Virtual Right2", NULL, "APLL Enable"},
 
+	{"ADC Virtual Left1", NULL, "AIF Enable"},
+	{"ADC Virtual Right1", NULL, "AIF Enable"},
+	{"ADC Virtual Left2", NULL, "AIF Enable"},
+	{"ADC Virtual Right2", NULL, "AIF Enable"},
+
 	/* Analog bypass routes */
 	{"Right1 Analog Loopback", "Switch", "Analog Right"},
 	{"Left1 Analog Loopback", "Switch", "Analog Left"},