ASoC: audio-graph-card: support snd_soc_dai_link_component style for codec

Current ASoC is supporting snd_soc_dai_link_component for binding,
it is more useful than current legacy style.
Currently only codec is supporting it as multicodec (= codecs).
CPU will support multi style in the future.
We want to have it on Platform too in the future.

If all Codec/CPU/Platform are replaced into snd_soc_dai_link_component
style, we can remove legacy complex style.
This patch supports snd_soc_dai_link_component style
for audio-graph-card for codec.

[current]
struct snd_soc_dai_link {
	...
	*cpu_name;
	*cpu_of_node;
	*cpu_dai_name;

	*codec_name;
	*codec_of_node;
	*codec_dai_name;
	*codecs;
	num_codecs;

	*platform_name;
	*platform_of_node;
	...
}

[in the future]
struct snd_soc_dai_link {
	...
	*cpus
	num_cpus;

	*codecs;
	num_codecs;

	*platform;
	...
}

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

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

@@ -25,6 +25,7 @@ struct graph_card_data {
 	struct graph_dai_props {
 		struct asoc_simple_dai cpu_dai;
 		struct asoc_simple_dai codec_dai;
+		struct snd_soc_dai_link_component codecs; /* single codec */
 		unsigned int mclk_fs;
 	} *dai_props;
 	unsigned int mclk_fs;
@@ -213,7 +214,7 @@ static int asoc_graph_card_dai_link_of(struct device_node *cpu_port,
 	ret = asoc_simple_card_set_dailink_name(dev, dai_link,
 						"%s-%s",
 						dai_link->cpu_dai_name,
-						dai_link->codec_dai_name);
+						dai_link->codecs->dai_name);
 	if (ret < 0)
 		goto dai_link_of_err;
 
@@ -299,7 +300,7 @@ static int asoc_graph_card_probe(struct platform_device *pdev)
 	struct graph_dai_props *dai_props;
 	struct device *dev = &pdev->dev;
 	struct snd_soc_card *card;
-	int num, ret;
+	int num, ret, i;
 
 	/* Allocate the private data and the DAI link array */
 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
@@ -315,6 +316,17 @@ static int asoc_graph_card_probe(struct platform_device *pdev)
 	if (!dai_props || !dai_link)
 		return -ENOMEM;
 
+	/*
+	 * Use snd_soc_dai_link_component instead of legacy style
+	 * It is codec only. but cpu/platform will be supported in the future.
+	 * see
+	 *	soc-core.c :: snd_soc_init_multicodec()
+	 */
+	for (i = 0; i < num; i++) {
+		dai_link[i].codecs	= &dai_props[i].codecs;
+		dai_link[i].num_codecs	= 1;
+	}
+
 	priv->pa_gpio = devm_gpiod_get_optional(dev, "pa", GPIOD_OUT_LOW);
 	if (IS_ERR(priv->pa_gpio)) {
 		ret = PTR_ERR(priv->pa_gpio);