ASoC: audio-graph-card2.c: make Codec2Codec settings optional

Current audio-graph-card2 can use Codec2Codec, and having its
original parameter (= rate) on DT is mandatory for now.

But simple-card-utils.c has asoc_simple_init_for_codec2codec() to
setup *default* Codec2Codec settings.

This patch makes Audio Graph Card2 Codec2Codec rate settings
optional.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87fsjls95u.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/generic/audio-graph-card2-custom-sample.dtsi

@@ -154,11 +154,12 @@ ports@1 {
 
 		codec2codec {
 			ports@0 {
-				rate = <48000>;
+				/* use default settings */
 			c2c:	port@0 { c2cf_ep: endpoint { remote-endpoint = <&codec6_ep>; }; };
 				port@1 { c2cb_ep: endpoint { remote-endpoint = <&codec7_ep>; }; };
 			};
 			ports@1 {
+				/* use original settings */
 				rate = <48000>;
 			c2c_m:	port@0 { c2cmf_ep: endpoint { remote-endpoint = <&mc2c0_ep>; }; };
 				port@1 { c2cmb_ep: endpoint { remote-endpoint = <&mc2c1_ep>; }; };

sound/soc/generic/audio-graph-card2.c

@@ -851,8 +851,6 @@ int audio_graph2_link_c2c(struct asoc_simple_priv *priv,
 			  struct link_info *li)
 {
 	struct snd_soc_dai_link *dai_link = simple_priv_to_link(priv, li->link);
-	struct simple_dai_props *dai_props = simple_priv_to_props(priv, li->link);
-	struct snd_soc_pcm_stream *c2c_conf = dai_props->c2c_conf;
 	struct device_node *port0, *port1, *ports;
 	struct device_node *codec0_port, *codec1_port;
 	struct device_node *ep0, *ep1;
@@ -880,21 +878,30 @@ int audio_graph2_link_c2c(struct asoc_simple_priv *priv,
 	ports = of_get_parent(port0);
 	port1 = of_get_next_child(ports, lnk);
 
+	/*
+	 * Card2 can use original Codec2Codec settings if DT has.
+	 * It will use default settings if no settings on DT.
+	 * see
+	 *	asoc_simple_init_for_codec2codec()
+	 *
+	 * Add more settings here if needed
+	 */
 	of_property_read_u32(ports, "rate", &val);
-	if (!val) {
-		struct device *dev = simple_priv_to_dev(priv);
-
-		dev_err(dev, "Codec2Codec needs rate settings\n");
-		goto err1;
+	if (val) {
+		struct simple_dai_props *dai_props = simple_priv_to_props(priv, li->link);
+		struct snd_soc_pcm_stream *c2c_conf = dai_props->c2c_conf;
+
+		c2c_conf->formats	= SNDRV_PCM_FMTBIT_S32_LE; /* update ME */
+		c2c_conf->rates		= SNDRV_PCM_RATE_8000_384000;
+		c2c_conf->rate_min	=
+		c2c_conf->rate_max	= val;
+		c2c_conf->channels_min	=
+		c2c_conf->channels_max	= 2; /* update ME */
+
+		dai_link->params	= c2c_conf;
+		dai_link->num_params	= 1;
 	}
 
-	c2c_conf->formats	= SNDRV_PCM_FMTBIT_S32_LE; /* update ME */
-	c2c_conf->rate_min	=
-	c2c_conf->rate_max	= val;
-	c2c_conf->channels_min	=
-	c2c_conf->channels_max	= 2; /* update ME */
-	dai_link->params	= c2c_conf;
-
 	ep0 = port_to_endpoint(port0);
 	ep1 = port_to_endpoint(port1);
 
@@ -923,7 +930,6 @@ int audio_graph2_link_c2c(struct asoc_simple_priv *priv,
 	of_node_put(ep1);
 	of_node_put(codec0_port);
 	of_node_put(codec1_port);
-err1:
 	of_node_put(ports);
 	of_node_put(port0);
 	of_node_put(port1);