ASoC: arizona: Add noise gate hold time enumeration

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/codecs/arizona.c b/sound/soc/codecs/arizona.c
index adf397b..819920d 100644
--- a/sound/soc/codecs/arizona.c
+++ b/sound/soc/codecs/arizona.c
@@ -275,6 +275,15 @@
 			arizona_lhpf_mode_text);
 EXPORT_SYMBOL_GPL(arizona_lhpf4_mode);
 
+static const char *arizona_ng_hold_text[] = {
+	"30ms", "120ms", "250ms", "500ms",
+};
+
+const struct soc_enum arizona_ng_hold =
+	SOC_ENUM_SINGLE(ARIZONA_NOISE_GATE_CONTROL, ARIZONA_NGATE_HOLD_SHIFT,
+			4, arizona_ng_hold_text);
+EXPORT_SYMBOL_GPL(arizona_ng_hold);
+
 int arizona_in_ev(struct snd_soc_dapm_widget *w, struct snd_kcontrol *kcontrol,
 		  int event)
 {
diff --git a/sound/soc/codecs/arizona.h b/sound/soc/codecs/arizona.h
index 41dae1e..3d083d0 100644
--- a/sound/soc/codecs/arizona.h
+++ b/sound/soc/codecs/arizona.h
@@ -176,6 +176,8 @@
 extern const struct soc_enum arizona_lhpf3_mode;
 extern const struct soc_enum arizona_lhpf4_mode;
 
+extern const struct soc_enum arizona_ng_hold;
+
 extern int arizona_in_ev(struct snd_soc_dapm_widget *w,
 			 struct snd_kcontrol *kcontrol,
 			 int event);