[alsa-devel] [PATCH v2] ASoC: simple-card: cpu_dai_name creates confusion when DT case

Kuninori Morimoto kuninori.morimoto.gx at gmail.com
Fri Feb 28 03:25:24 CET 2014

From: Kuninori Morimoto <kuninori.morimoto.gx at renesas.com>

Basically, soc_bind_dai_link() checks
cpu_dai->dev->of_node and dai_link->cpu_of_node in DT case.
But after that it will check
cpu_dai->name and dai_link->cpu_dai_name too.

On the other hand, snd_soc_dai :: name is created by
fmt_single_name() or fmt_multiple_name().

There is no confusion if dai name is created by fmt_multiple_name(),
since cpu_dai->name is same as dai_link->cpu_dai_name.
but, if dai name is created by fmt_single_name(), CPU DAI never match.

Thus, simple-card not set dai_link->cpu_dai_name if DT case
to skip naming match on soc_bind_dai_link()

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx at renesas.com>
v1 -> v2

 - for latest mark/topic/simple branch

 sound/soc/generic/simple-card.c |   11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/sound/soc/generic/simple-card.c b/sound/soc/generic/simple-card.c
index bdd176d..034a2b7 100644
--- a/sound/soc/generic/simple-card.c
+++ b/sound/soc/generic/simple-card.c
@@ -234,6 +234,17 @@ static int asoc_simple_card_parse_of(struct device_node *node,
+	/*
+	 * 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 to escape name matching.
+	 * see
+	 *	fmt_single_name()
+	 *	fmt_multiple_name()
+	 */
+	dai_link->cpu_dai_name = NULL;
 	return 0;

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