2 files changed, 43 insertions, 0 deletions

diff --git a/include/sound/soc.h b/include/sound/soc.h
index 9a81e2e7d661..1dd7dc5f7d52 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -13,6 +13,7 @@
 #ifndef __LINUX_SND_SOC_H
 #define __LINUX_SND_SOC_H
 
+#include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/types.h>
 #include <linux/notifier.h>
@@ -673,6 +674,11 @@ struct snd_soc_cache_ops {
 /* component interface */
 struct snd_soc_component_driver {
         const char *name;
+
+        /* DT */
+        int (*of_xlate_dai_name)(struct snd_soc_component *component,
+                                 struct of_phandle_args *args,
+                                 const char **dai_name);
 };
 
 struct snd_soc_component {
@@ -1206,6 +1212,8 @@ int snd_soc_of_parse_audio_routing(struct snd_soc_card *card,
                                    const char *propname);
 unsigned int snd_soc_of_parse_daifmt(struct device_node *np,
                                      const char *prefix);
+int snd_soc_of_get_dai_name(struct device_node *of_node,
+                            const char **dai_name);
 
 #include <sound/soc-dai.h>
 
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 014ac10267da..711bd362028d 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -4590,6 +4590,41 @@ unsigned int snd_soc_of_parse_daifmt(struct device_node *np,
 }
 EXPORT_SYMBOL_GPL(snd_soc_of_parse_daifmt);
 
+int snd_soc_of_get_dai_name(struct device_node *of_node,
+                            const char **dai_name)
+{
+        struct snd_soc_component *pos;
+        struct of_phandle_args args;
+        int ret;
+
+        ret = of_parse_phandle_with_args(of_node, "sound-dai",
+                                         "#sound-dai-cells", 0, &args);
+        if (ret)
+                return ret;
+
+        ret = -EPROBE_DEFER;
+
+        mutex_lock(&client_mutex);
+        list_for_each_entry(pos, &component_list, list) {
+                if (pos->dev->of_node != args.np)
+                        continue;
+
+                if (!pos->driver->of_xlate_dai_name) {
+                        ret = -ENOSYS;
+                        break;
+                }
+
+                ret = pos->driver->of_xlate_dai_name(pos, &args, dai_name);
+                break;
+        }
+        mutex_unlock(&client_mutex);
+
+        of_node_put(args.np);
+
+        return ret;
+}
+EXPORT_SYMBOL_GPL(snd_soc_of_get_dai_name);
+
 static int __init snd_soc_init(void)
 {
 #ifdef CONFIG_DEBUG_FS