ASoC: Export debugfs root dentry

A couple Tegra ASoC drivers will create debugfs entries. Mark requested
these by under debugfs/asoc/ not just debugfs/. To enable this, export
the dentry representing debugfs/asoc/.

Also, rename debugfs_root -> asoc_debugfs_root now it's exported to
prevent potential symbol name clashes.
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

include/sound/soc.h

@@ -756,4 +756,8 @@ static inline void *snd_soc_pcm_get_drvdata(struct snd_soc_pcm_runtime *rtd)
 
 #include <sound/soc-dai.h>
 
+#ifdef CONFIG_DEBUG_FS
+extern struct dentry *asoc_debugfs_root;
+#endif
+
 #endif

sound/soc/soc-core.c

@@ -48,7 +48,8 @@ static DEFINE_MUTEX(pcm_mutex);
 static DECLARE_WAIT_QUEUE_HEAD(soc_pm_waitq);
 
 #ifdef CONFIG_DEBUG_FS
-static struct dentry *debugfs_root;
+struct dentry *asoc_debugfs_root;
+EXPORT_SYMBOL_GPL(asoc_debugfs_root);
 #endif
 
 static DEFINE_MUTEX(client_mutex);
@@ -360,7 +361,7 @@ static const struct file_operations platform_list_fops = {
 static void soc_init_card_debugfs(struct snd_soc_card *card)
 {
 	card->debugfs_card_root = debugfs_create_dir(card->name,
-						     debugfs_root);
+						     asoc_debugfs_root);
 	if (!card->debugfs_card_root) {
 		dev_warn(card->dev,
 			 "ASoC: Failed to create codec debugfs directory\n");
@@ -3583,22 +3584,22 @@ EXPORT_SYMBOL_GPL(snd_soc_unregister_codec);
 static int __init snd_soc_init(void)
 {
 #ifdef CONFIG_DEBUG_FS
-	debugfs_root = debugfs_create_dir("asoc", NULL);
-	if (IS_ERR(debugfs_root) || !debugfs_root) {
+	asoc_debugfs_root = debugfs_create_dir("asoc", NULL);
+	if (IS_ERR(asoc_debugfs_root) || !asoc_debugfs_root) {
 		printk(KERN_WARNING
 		       "ASoC: Failed to create debugfs directory\n");
-		debugfs_root = NULL;
+		asoc_debugfs_root = NULL;
 	}
 
-	if (!debugfs_create_file("codecs", 0444, debugfs_root, NULL,
+	if (!debugfs_create_file("codecs", 0444, asoc_debugfs_root, NULL,
 				 &codec_list_fops))
 		pr_warn("ASoC: Failed to create CODEC list debugfs file\n");
 
-	if (!debugfs_create_file("dais", 0444, debugfs_root, NULL,
+	if (!debugfs_create_file("dais", 0444, asoc_debugfs_root, NULL,
 				 &dai_list_fops))
 		pr_warn("ASoC: Failed to create DAI list debugfs file\n");
 
-	if (!debugfs_create_file("platforms", 0444, debugfs_root, NULL,
+	if (!debugfs_create_file("platforms", 0444, asoc_debugfs_root, NULL,
 				 &platform_list_fops))
 		pr_warn("ASoC: Failed to create platform list debugfs file\n");
 #endif
@@ -3610,7 +3611,7 @@ module_init(snd_soc_init);
 static void __exit snd_soc_exit(void)
 {
 #ifdef CONFIG_DEBUG_FS
-	debugfs_remove_recursive(debugfs_root);
+	debugfs_remove_recursive(asoc_debugfs_root);
 #endif
 	platform_driver_unregister(&soc_driver);
 }