[PATCH 1/3] ASoC: simple-card-utils: add asoc_simple_card_of_canonicalize_cpu()

[Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>]

From: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>

snd_soc_find_dai() will check dai_name after of_node matching
if dai_link has it. but, it will never match if name was
created by fmt_single_name(). Thus, we need to remove cpu_dai_name
if cpu was single.

Before, simple-card assumed that CPU was single if Card has single
link. It is no problem in below case

/* Card uses 1 link */
card {
	compatible = "audio-graph-card";
	...
	dais = <&cpu_port0>;
};

/* CPU has single endpoints */
cpu {
	...
	cpu_port0: port@0 {
		endpoint { ... };
	};
};

But it can't handle correctly below case.
This patch adds new asoc_simple_card_of_canonicalize_cpu() and
confirm it was single or not by counting endpoint.

/* Card uses only 1 link */
card {
	compatible = "audio-graph-card";
	...
	dais = <&cpu_port0>;
};

/* CPU has many endpoints */
cpu {
	...
	ports {
		cpu_port0: port@0 {
			endpoint { ... };
		};
		cpu_port1: port@1 {
			endpoint { ... };
		};
		...
	};
};

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>
---
 include/sound/simple_card_utils.h     |  1 +
 sound/soc/generic/simple-card-utils.c | 20 ++++++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/include/sound/simple_card_utils.h b/include/sound/simple_card_utils.h
index 42c6a6a..bfb3dca 100644
--- a/include/sound/simple_card_utils.h
+++ b/include/sound/simple_card_utils.h
@@ -90,6 +90,7 @@ int asoc_simple_card_init_dai(struct snd_soc_dai *dai,
 			      struct asoc_simple_dai *simple_dai);
 
 int asoc_simple_card_canonicalize_dailink(struct snd_soc_dai_link *dai_link);
+void asoc_simple_card_of_canonicalize_cpu(struct snd_soc_dai_link *dai_link);
 void asoc_simple_card_canonicalize_cpu(struct snd_soc_dai_link *dai_link,
 				      int is_single_links);
 
diff --git a/sound/soc/generic/simple-card-utils.c b/sound/soc/generic/simple-card-utils.c
index 26d64fa..bc2e9a2 100644
--- a/sound/soc/generic/simple-card-utils.c
+++ b/sound/soc/generic/simple-card-utils.c
@@ -343,6 +343,26 @@ int asoc_simple_card_canonicalize_dailink(struct snd_soc_dai_link *dai_link)
 }
 EXPORT_SYMBOL_GPL(asoc_simple_card_canonicalize_dailink);
 
+void asoc_simple_card_of_canonicalize_cpu(struct snd_soc_dai_link *dai_link)
+{
+	/*
+	 * soc_bind_dai_link() will check cpu name after
+	 * of_node matching if dai_link has cpu_dai_name.
+	 * but, it will never match if name was created by
+	 * fmt_single_name(). remove cpu_dai_name if cpu_args
+	 * was 0. See:
+	 *	fmt_single_name()
+	 *	fmt_multiple_name()
+	 *
+	 * simple card utils assumes if driver has many endpoint,
+	 * it is using fmt_multiple_name()
+	 */
+
+	if (of_graph_get_endpoint_count(dai_link->cpu_of_node) == 1)
+		dai_link->cpu_dai_name = NULL;
+}
+EXPORT_SYMBOL_GPL(asoc_simple_card_of_canonicalize_cpu);
+
 void asoc_simple_card_canonicalize_cpu(struct snd_soc_dai_link *dai_link,
 				       int is_single_links)
 {
-- 
1.9.1