2 files changed, 48 insertions, 0 deletions

diff --git a/include/sound/soc-dapm.h b/include/sound/soc-dapm.h
index e3833d9f1914..05559e571d44 100644
--- a/include/sound/soc-dapm.h
+++ b/include/sound/soc-dapm.h
@@ -229,6 +229,10 @@ struct device;
 {       .id = snd_soc_dapm_adc, .name = wname, .sname = stname, .reg = wreg, \
         .shift = wshift, .invert = winvert, \
         .event = wevent, .event_flags = wflags}
+#define SND_SOC_DAPM_CLOCK_SUPPLY(wname) \
+{       .id = snd_soc_dapm_clock_supply, .name = wname, \
+        .reg = SND_SOC_NOPM, .event = dapm_clock_event, \
+        .event_flags = SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD }
 
 /* generic widgets */
 #define SND_SOC_DAPM_REG(wid, wname, wreg, wshift, wmask, won_val, woff_val) \
@@ -245,6 +249,7 @@ struct device;
         .reg = SND_SOC_NOPM, .shift = wdelay, .event = dapm_regulator_event, \
         .event_flags = SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD }
 
+
 /* dapm kcontrol types */
 #define SOC_DAPM_SINGLE(xname, reg, shift, max, invert) \
 {       .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
@@ -327,6 +332,8 @@ int dapm_reg_event(struct snd_soc_dapm_widget *w,
                    struct snd_kcontrol *kcontrol, int event);
 int dapm_regulator_event(struct snd_soc_dapm_widget *w,
                          struct snd_kcontrol *kcontrol, int event);
+int dapm_clock_event(struct snd_soc_dapm_widget *w,
+                         struct snd_kcontrol *kcontrol, int event);
 
 /* dapm controls */
 int snd_soc_dapm_put_volsw(struct snd_kcontrol *kcontrol,
@@ -432,6 +439,7 @@ enum snd_soc_dapm_type {
         snd_soc_dapm_post,                      /* machine specific post widget - exec last */
         snd_soc_dapm_supply,            /* power/clock supply */
         snd_soc_dapm_regulator_supply,  /* external regulator */
+        snd_soc_dapm_clock_supply,      /* external clock */
         snd_soc_dapm_aif_in,            /* audio interface input */
         snd_soc_dapm_aif_out,           /* audio interface output */
         snd_soc_dapm_siggen,            /* signal generator */
@@ -537,6 +545,8 @@ struct snd_soc_dapm_widget {
         struct list_head dirty;
         int inputs;
         int outputs;
+
+        struct clk *clk;
 };
 
 struct snd_soc_dapm_update {
diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index 90ee77d2409d..3bb7a6f058d0 100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -35,6 +35,7 @@
 #include <linux/debugfs.h>
 #include <linux/pm_runtime.h>
 #include <linux/regulator/consumer.h>
+#include <linux/clk.h>
 #include <linux/slab.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
@@ -51,6 +52,7 @@ static int dapm_up_seq[] = {
         [snd_soc_dapm_pre] = 0,
         [snd_soc_dapm_supply] = 1,
         [snd_soc_dapm_regulator_supply] = 1,
+        [snd_soc_dapm_clock_supply] = 1,
         [snd_soc_dapm_micbias] = 2,
         [snd_soc_dapm_dai_link] = 2,
         [snd_soc_dapm_dai] = 3,
@@ -92,6 +94,7 @@ static int dapm_down_seq[] = {
         [snd_soc_dapm_aif_out] = 10,
         [snd_soc_dapm_dai] = 10,
         [snd_soc_dapm_dai_link] = 11,
+        [snd_soc_dapm_clock_supply] = 12,
         [snd_soc_dapm_regulator_supply] = 12,
         [snd_soc_dapm_supply] = 12,
         [snd_soc_dapm_post] = 13,
@@ -391,6 +394,7 @@ static void dapm_set_path_status(struct snd_soc_dapm_widget *w,
         case snd_soc_dapm_vmid:
         case snd_soc_dapm_supply:
         case snd_soc_dapm_regulator_supply:
+        case snd_soc_dapm_clock_supply:
         case snd_soc_dapm_aif_in:
         case snd_soc_dapm_aif_out:
         case snd_soc_dapm_dai:
@@ -764,6 +768,7 @@ static int is_connected_output_ep(struct snd_soc_dapm_widget *widget,
         switch (widget->id) {
         case snd_soc_dapm_supply:
         case snd_soc_dapm_regulator_supply:
+        case snd_soc_dapm_clock_supply:
                 return 0;
         default:
                 break;
@@ -850,6 +855,7 @@ static int is_connected_input_ep(struct snd_soc_dapm_widget *widget,
         switch (widget->id) {
         case snd_soc_dapm_supply:
         case snd_soc_dapm_regulator_supply:
+        case snd_soc_dapm_clock_supply:
                 return 0;
         default:
                 break;
@@ -996,6 +1002,24 @@ int dapm_regulator_event(struct snd_soc_dapm_widget *w,
 }
 EXPORT_SYMBOL_GPL(dapm_regulator_event);
 
+/*
+ * Handler for clock supply widget.
+ */
+int dapm_clock_event(struct snd_soc_dapm_widget *w,
+                   struct snd_kcontrol *kcontrol, int event)
+{
+        if (!w->clk)
+                return -EIO;
+
+        if (SND_SOC_DAPM_EVENT_ON(event)) {
+                return clk_enable(w->clk);
+        } else {
+                clk_disable(w->clk);
+                return 0;
+        }
+}
+EXPORT_SYMBOL_GPL(dapm_clock_event);
+
 static int dapm_widget_power_check(struct snd_soc_dapm_widget *w)
 {
         if (w->power_checked)
@@ -1487,6 +1511,7 @@ static void dapm_widget_set_power(struct snd_soc_dapm_widget *w, bool power,
         switch (w->id) {
         case snd_soc_dapm_supply:
         case snd_soc_dapm_regulator_supply:
+        case snd_soc_dapm_clock_supply:
                 /* Supplies can't affect their outputs, only their inputs */
                 break;
         default:
@@ -1587,6 +1612,7 @@ static int dapm_power_widgets(struct snd_soc_dapm_context *dapm, int event)
                                 break;
                         case snd_soc_dapm_supply:
                         case snd_soc_dapm_regulator_supply:
+                        case snd_soc_dapm_clock_supply:
                         case snd_soc_dapm_micbias:
                                 if (d->target_bias_level < SND_SOC_BIAS_STANDBY)
                                         d->target_bias_level = SND_SOC_BIAS_STANDBY;
@@ -1941,6 +1967,7 @@ static ssize_t dapm_widget_show(struct device *dev,
                 case snd_soc_dapm_mixer_named_ctl:
                 case snd_soc_dapm_supply:
                 case snd_soc_dapm_regulator_supply:
+                case snd_soc_dapm_clock_supply:
                         if (w->name)
                                 count += sprintf(buf + count, "%s: %s\n",
                                         w->name, w->power ? "On":"Off");
@@ -2187,6 +2214,7 @@ static int snd_soc_dapm_add_route(struct snd_soc_dapm_context *dapm,
         case snd_soc_dapm_post:
         case snd_soc_dapm_supply:
         case snd_soc_dapm_regulator_supply:
+        case snd_soc_dapm_clock_supply:
         case snd_soc_dapm_aif_in:
         case snd_soc_dapm_aif_out:
         case snd_soc_dapm_dai:
@@ -2873,6 +2901,15 @@ snd_soc_dapm_new_control(struct snd_soc_dapm_context *dapm,
                         return NULL;
                 }
                 break;
+        case snd_soc_dapm_clock_supply:
+                w->clk = clk_get(dapm->dev, w->name);
+                if (IS_ERR(w->clk)) {
+                        ret = PTR_ERR(w->clk);
+                        dev_err(dapm->dev, "Failed to request %s: %d\n",
+                                w->name, ret);
+                        return NULL;
+                }
+                break;
         default:
                 break;
         }
@@ -2924,6 +2961,7 @@ snd_soc_dapm_new_control(struct snd_soc_dapm_context *dapm,
                 break;
         case snd_soc_dapm_supply:
         case snd_soc_dapm_regulator_supply:
+        case snd_soc_dapm_clock_supply:
                 w->power_check = dapm_supply_check_power;
                 break;
         case snd_soc_dapm_dai: