ASoC: rsnd: enable multi Component support for Audio Graph Card/Card2

+-- Basic Board ---------+
	|+--------+      +------+|
	|| CPU ch0| <--> |CodecA||
	||     ch1| <-+  +------+|
	|+--------+   |          |
	+-------------|----------+
	+-- expansion board -----+
	|             |  +------+|
	|             +->|CodecB||
	|                +------+|
	+------------------------+

In above HW connection case, we intuitively think we want to handle these
as "2 Sound Cards".

	card0,0: CPU-ch0 - CodecA
	card1,0: CPU-ch1 - CodecB

But, we needed to handle it as "1 big Sound Card", because of
Component vs Card limitation.

	card0,0: CPU-ch0 - CodecA
	card0,1: CPU-ch1 - CodecB

This patch enables multi Component to handle multi Cards.
To support it, it needs

	- Fill dai_args for each DAI on snd_soc_dai_driver
	- Parse DT for each Component (Simple Card/Audio Graph Card)

Ex) Simple Card

	rcar_sound {
		...

		/* Component0 */
		rcar_sound,dai@0 {
			...
		};

		/* Component1 */
		rcar_sound,dai@1 {
			...
		};
	};

Ex) Audio Graph Card/Card2

	rcar_sound {
		/* Component0 */
		ports@0 {
			...
		};

		/* Component1 */
		ports@1 {
			...
		};
	};

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87tttub1m4.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sh/rcar/core.c

@@ -1260,13 +1260,13 @@ int rsnd_node_count(struct rsnd_priv *priv, struct device_node *node, char *name
 	return i;
 }
 
-static struct device_node *rsnd_dai_of_node(struct rsnd_priv *priv,
+static int rsnd_dai_of_node(struct rsnd_priv *priv, int *is_graph)
-					    int *nr, int *is_graph)
 {
 	struct device *dev = rsnd_priv_to_dev(priv);
 	struct device_node *np = dev->of_node;
-	struct device_node *dai_node;
+	struct device_node *ports, *node;
-	struct device_node *ret;
+	int nr = 0;
+	int i = 0;
 
 	*is_graph = 0;
 
@@ -1278,30 +1278,47 @@ static struct device_node *rsnd_dai_of_node(struct rsnd_priv *priv,
 	/*
 	 * Simple-Card
 	 */
-	dai_node = of_get_child_by_name(np, RSND_NODE_DAI);
+	node = of_get_child_by_name(np, RSND_NODE_DAI);
-	if (dai_node) {
+	if (!node)
-		*nr = of_get_child_count(dai_node);
+		goto audio_graph;
-		ret = dai_node;
+
-		goto of_node_compatible;
+	of_node_put(node);
+
+	for_each_child_of_node(np, node) {
+		if (!of_node_name_eq(node, RSND_NODE_DAI))
+			continue;
+
+		priv->component_dais[i] = of_get_child_count(node);
+		nr += priv->component_dais[i];
+		i++;
+		if (i >= RSND_MAX_COMPONENT) {
+			dev_info(dev, "reach to max component\n");
+			break;
+		}
 	}
 
+	return nr;
+
+audio_graph:
 	/*
 	 * Audio-Graph-Card
 	 */
-	dai_node = of_graph_get_next_endpoint(np, NULL);
+	for_each_child_of_node(np, ports) {
-	if (dai_node) {
+		if (!of_node_name_eq(ports, "ports") &&
-		*nr = of_graph_get_endpoint_count(np);
+		    !of_node_name_eq(ports, "port"))
-		*is_graph = 1;
+			continue;
-		ret = np;
+		priv->component_dais[i] = of_graph_get_endpoint_count(ports);
-		goto of_node_compatible;
+		nr += priv->component_dais[i];
+		i++;
+		if (i >= RSND_MAX_COMPONENT) {
+			dev_info(dev, "reach to max component\n");
+			break;
+		}
 	}
 
-	return NULL;
+	*is_graph = 1;
 
-of_node_compatible:
+	return nr;
-	of_node_put(dai_node);
-
-	return ret;
 }
 
 
@@ -1365,6 +1382,8 @@ static int rsnd_pcm_new(struct snd_soc_pcm_runtime *rtd,
 
 static void __rsnd_dai_probe(struct rsnd_priv *priv,
 			     struct device_node *dai_np,
+			     struct device_node *node_np,
+			     uint32_t node_arg,
 			     int dai_i)
 {
 	struct rsnd_dai_stream *io_playback;
@@ -1382,11 +1401,17 @@ static void __rsnd_dai_probe(struct rsnd_priv *priv,
 
 	snprintf(rdai->name, RSND_DAI_NAME_SIZE, "rsnd-dai.%d", dai_i);
 
+	/* for multi Component */
+	rdai->dai_args.np		= node_np;
+	rdai->dai_args.args_count	= 1;
+	rdai->dai_args.args[0]		= node_arg;
+
 	rdai->priv	= priv;
 	drv->name	= rdai->name;
 	drv->ops	= &rsnd_soc_dai_ops;
 	drv->pcm_new	= rsnd_pcm_new;
 	drv->id		= dai_i;
+	drv->dai_args	= &rdai->dai_args;
 
 	io_playback->rdai		= rdai;
 	io_capture->rdai		= rdai;
@@ -1450,16 +1475,15 @@ static void __rsnd_dai_probe(struct rsnd_priv *priv,
 
 static int rsnd_dai_probe(struct rsnd_priv *priv)
 {
-	struct device_node *dai_node;
-	struct device_node *dai_np;
 	struct snd_soc_dai_driver *rdrv;
 	struct device *dev = rsnd_priv_to_dev(priv);
+	struct device_node *np = dev->of_node;
 	struct rsnd_dai *rdai;
 	int nr = 0;
 	int is_graph;
 	int dai_i;
 
-	dai_node = rsnd_dai_of_node(priv, &nr, &is_graph);
+	nr = rsnd_dai_of_node(priv, &is_graph);
 	if (!nr)
 		return -EINVAL;
 
@@ -1477,8 +1501,15 @@ static int rsnd_dai_probe(struct rsnd_priv *priv)
 	 */
 	dai_i = 0;
 	if (is_graph) {
-		for_each_endpoint_of_node(dai_node, dai_np) {
+		struct device_node *ports;
-			__rsnd_dai_probe(priv, dai_np, dai_i);
+		struct device_node *dai_np;
+
+		for_each_child_of_node(np, ports) {
+			if (!of_node_name_eq(ports, "ports") &&
+			    !of_node_name_eq(ports, "port"))
+				continue;
+			for_each_endpoint_of_node(ports, dai_np) {
+				__rsnd_dai_probe(priv, dai_np, dai_np, 0, dai_i);
 				if (rsnd_is_gen3(priv) || rsnd_is_gen4(priv)) {
 					rdai = rsnd_rdai_get(priv, dai_i);
 
@@ -1487,9 +1518,17 @@ static int rsnd_dai_probe(struct rsnd_priv *priv)
 				}
 				dai_i++;
 			}
+		}
 	} else {
-		for_each_child_of_node(dai_node, dai_np) {
+		struct device_node *node;
-			__rsnd_dai_probe(priv, dai_np, dai_i);
+		struct device_node *dai_np;
+
+		for_each_child_of_node(np, node) {
+			if (!of_node_name_eq(node, RSND_NODE_DAI))
+				continue;
+
+			for_each_child_of_node(node, dai_np) {
+				__rsnd_dai_probe(priv, dai_np, np, dai_i, dai_i);
 				if (rsnd_is_gen3(priv) || rsnd_is_gen4(priv)) {
 					rdai = rsnd_rdai_get(priv, dai_i);
 
@@ -1499,6 +1538,7 @@ static int rsnd_dai_probe(struct rsnd_priv *priv)
 				dai_i++;
 			}
 		}
+	}
 
 	return 0;
 }
@@ -1926,6 +1966,7 @@ static int rsnd_probe(struct platform_device *pdev)
 		rsnd_dai_probe,
 	};
 	int ret, i;
+	int ci;
 
 	/*
 	 *	init priv data
@@ -1962,13 +2003,20 @@ static int rsnd_probe(struct platform_device *pdev)
 	/*
 	 *	asoc register
 	 */
+	ci = 0;
+	for (i = 0; priv->component_dais[i] > 0; i++) {
+		int nr = priv->component_dais[i];
+
 		ret = devm_snd_soc_register_component(dev, &rsnd_soc_component,
-					 priv->daidrv, rsnd_rdai_nr(priv));
+						      priv->daidrv + ci, nr);
 		if (ret < 0) {
-		dev_err(dev, "cannot snd dai register\n");
+			dev_err(dev, "cannot snd component register\n");
 			goto exit_snd_probe;
 		}
 
+		ci += nr;
+	}
+
 	pm_runtime_enable(dev);
 
 	dev_info(dev, "probed\n");

sound/soc/sh/rcar/rsnd.h

@@ -545,6 +545,7 @@ struct rsnd_dai {
 	struct rsnd_dai_stream capture;
 	struct rsnd_priv *priv;
 	struct snd_pcm_hw_constraint_list constraint;
+	struct of_phandle_args dai_args;
 
 	int max_channels;	/* 2ch - 16ch */
 	int ssi_lane;		/* 1lane - 4lane */
@@ -702,6 +703,9 @@ struct rsnd_priv {
 	struct snd_soc_dai_driver *daidrv;
 	struct rsnd_dai *rdai;
 	int rdai_nr;
+
+#define RSND_MAX_COMPONENT 3
+	int component_dais[RSND_MAX_COMPONENT];
 };
 
 #define rsnd_priv_to_pdev(priv)	((priv)->pdev)