ASoC: audio-graph: Expose helpers from audio graph

This commit exposes following functions which can be used by a sound
card driver based on audio graph driver. Idea is vendors can have a
thin driver and re-use common stuff from audio graph driver.

 - graph_card_probe()
 - graph_get_dais_count()
 - graph_parse_of()

In doing so a new header file is added for audio graph which can be
included by vendor drivers.

Signed-off-by: Sameer Pujar <spujar@nvidia.com>
Cc: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>

include/sound/graph_card.h

@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0
+ *
+ * ASoC audio graph card support
+ *
+ */
+
+#ifndef __GRAPH_CARD_H
+#define __GRAPH_CARD_H
+
+#include <sound/simple_card_utils.h>
+
+int graph_card_probe(struct snd_soc_card *card);
+
+void graph_get_dais_count(struct asoc_simple_priv *priv,
+			  struct link_info *li);
+
+int graph_parse_of(struct asoc_simple_priv *priv);
+
+#endif /* __GRAPH_CARD_H */

sound/soc/generic/audio-graph-card.c

@@ -529,7 +529,7 @@ static int graph_for_each_link(struct asoc_simple_priv *priv,
 	return 0;
 }
 
-static int graph_parse_of(struct asoc_simple_priv *priv)
+int graph_parse_of(struct asoc_simple_priv *priv)
 {
 	struct snd_soc_card *card = simple_priv_to_card(priv);
 	struct link_info li;
@@ -566,6 +566,7 @@ static int graph_parse_of(struct asoc_simple_priv *priv)
 
 	return asoc_simple_parse_card_name(card, NULL);
 }
+EXPORT_SYMBOL_GPL(graph_parse_of);
 
 static int graph_count_noml(struct asoc_simple_priv *priv,
 			    struct device_node *cpu_ep,
@@ -604,8 +605,8 @@ static int graph_count_dpcm(struct asoc_simple_priv *priv,
 	return 0;
 }
 
-static void graph_get_dais_count(struct asoc_simple_priv *priv,
-				 struct link_info *li)
+void graph_get_dais_count(struct asoc_simple_priv *priv,
+			  struct link_info *li)
 {
 	struct device *dev = simple_priv_to_dev(priv);
 
@@ -661,8 +662,9 @@ static void graph_get_dais_count(struct asoc_simple_priv *priv,
 	dev_dbg(dev, "link %d, dais %d, ccnf %d\n",
 		li->link, li->dais, li->conf);
 }
+EXPORT_SYMBOL_GPL(graph_get_dais_count);
 
-static int graph_card_probe(struct snd_soc_card *card)
+int graph_card_probe(struct snd_soc_card *card)
 {
 	struct asoc_simple_priv *priv = snd_soc_card_get_drvdata(card);
 	int ret;
@@ -677,6 +679,7 @@ static int graph_card_probe(struct snd_soc_card *card)
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(graph_card_probe);
 
 static int graph_probe(struct platform_device *pdev)
 {