ASoC: arizona: Add signal activity output for DRC

When doing signal activity detection, the only output from the DRC will
often be a GPIO pin. This patch adds a signal activity output that is
activated when a GPIO is configured to output the DRC signal activity
detection.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
diff --git a/sound/soc/codecs/wm5102.c b/sound/soc/codecs/wm5102.c
index 282fd23..a6cbdb4 100644
--- a/sound/soc/codecs/wm5102.c
+++ b/sound/soc/codecs/wm5102.c
@@ -998,6 +998,8 @@
 SND_SOC_DAPM_INPUT("IN3L"),
 SND_SOC_DAPM_INPUT("IN3R"),
 
+SND_SOC_DAPM_OUTPUT("DRC1 Signal Activity"),
+
 SND_SOC_DAPM_PGA_E("IN1L PGA", ARIZONA_INPUT_ENABLES, ARIZONA_IN1L_ENA_SHIFT,
 		   0, NULL, 0, arizona_in_ev,
 		   SND_SOC_DAPM_PRE_PMD | SND_SOC_DAPM_POST_PMD |
@@ -1614,6 +1616,9 @@
 	{ "SPKDAT1R", NULL, "OUT5R" },
 
 	{ "MICSUPP", NULL, "SYSCLK" },
+
+	{ "DRC1 Signal Activity", NULL, "DRC1L" },
+	{ "DRC1 Signal Activity", NULL, "DRC1R" },
 };
 
 static int wm5102_set_fll(struct snd_soc_codec *codec, int fll_id, int source,
@@ -1781,6 +1786,7 @@
 		return ret;
 
 	arizona_init_spk(codec);
+	arizona_init_gpio(codec);
 
 	snd_soc_dapm_disable_pin(&codec->dapm, "HAPTICS");