[PATCH 2/4] ASoC: audio-graph-card2: add CPU:Codec = N:M support

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

Now ASoC is supporting CPU:Codec = N:M support.
This patch enables it on Audio Graph Card2.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>
---
 sound/soc/generic/audio-graph-card2.c | 29 +++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/sound/soc/generic/audio-graph-card2.c b/sound/soc/generic/audio-graph-card2.c
index 5d856942bcaee..009fef88d443a 100644
--- a/sound/soc/generic/audio-graph-card2.c
+++ b/sound/soc/generic/audio-graph-card2.c
@@ -515,7 +515,10 @@ static int graph_parse_node(struct simple_util_priv *priv,
 	int ret = 0;
 
 	if (graph_lnk_is_multi(port)) {
+		struct device_node *ports = of_get_parent(port);
 		int idx;
+		int num;
+		char *props = "ch_maps";
 
 		of_node_get(port);
 
@@ -530,6 +533,32 @@ static int graph_parse_node(struct simple_util_priv *priv,
 			if (ret < 0)
 				break;
 		}
+
+		/* read nm_ch_maps if exist */
+		num = of_property_count_elems_of_size(ports, props, sizeof(u32));
+		if (num > 0) {
+			struct snd_soc_dai_link *dai_link = simple_priv_to_link(priv, li->link);
+			struct device *dev = simple_priv_to_dev(priv);
+			struct snd_soc_dai_link_ch_map *ch_maps = devm_kcalloc(dev, num, sizeof(*ch_maps), GFP_KERNEL);
+			int *temp = devm_kcalloc(dev, num, sizeof(int), GFP_KERNEL);
+			int i;
+
+			if (!ch_maps || !temp) {
+				ret = -ENOMEM;
+				goto multi_end;
+			}
+
+			ret = of_property_read_u32_array(ports, props, temp, num);
+			if (ret < 0)
+				goto multi_end;
+
+			dai_link->ch_maps = ch_maps;
+			for (i = 0; i < num; i++)
+				dai_link->ch_maps[i].connected_node = temp[i];
+multi_end:
+			devm_kfree(dev, temp);
+		}
+		of_node_put(ports);
 	} else {
 		/* Single CPU / Codec */
 		ep = port_to_endpoint(port);
-- 
2.25.1