ASoC: audio-graph-card2: use better image for Multi connection

1st port on Multi ports is for paired CPU/Codec, and the 2nd or later
port are for Multi Elements. This patch indicates its image to easy to
understand.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87sf5a4f1i.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

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

@@ -83,32 +83,32 @@
 	Multi-CPU/Codec
  ************************************
 
-It has connection part (= X) and list part (= y).
-links indicates connection part of CPU side (= A).
+It has link connection part (= X,x) and list part (= A,B,a,b).
+"links" is connection part of CPU side (= @).
 
-	    +-+   (A)	     +-+
- CPU1 --(y) | | <-(X)--(X)-> | | (y)-- Codec1
- CPU2 --(y) | |		     | | (y)-- Codec2
-	    +-+		     +-+
+	+----+		+---+
+ CPU1 --|A  X| <-@----> |x a|-- Codec1
+ CPU2 --|B   |		|  b|-- Codec2
+	+----+		+---+
 
-	sound {
-		compatible = "audio-graph-card2";
+ sound {
+	compatible = "audio-graph-card2";
 
-(A)		links = <&mcpu>;
+(@)	links = <&mcpu>;
 
-		multi {
-			ports@0 {
-(X) (A)			mcpu:	port@0 { mcpu0_ep: endpoint { remote-endpoint = <&mcodec0_ep>; }; };
-(y)				port@1 { mcpu1_ep: endpoint { remote-endpoint = <&cpu1_ep>; }; };
-(y)				port@2 { mcpu2_ep: endpoint { remote-endpoint = <&cpu2_ep>; }; };
-			};
-			ports@1 {
-(X)				port@0 { mcodec0_ep: endpoint { remote-endpoint = <&mcpu0_ep>; }; };
-(y)				port@1 { mcodec1_ep: endpoint { remote-endpoint = <&codec1_ep>; }; };
-(y)				port@2 { mcodec2_ep: endpoint { remote-endpoint = <&codec2_ep>; }; };
-			};
+	multi {
+		ports@0 {
+(@)		mcpu:	port@0 { mcpu0_ep: endpoint { remote-endpoint = <&mcodec0_ep>;	}; };	// (X) to pair
+			port@1 { mcpu1_ep: endpoint { remote-endpoint = <&cpu1_ep>;	}; };	// (A) Multi Element
+			port@2 { mcpu2_ep: endpoint { remote-endpoint = <&cpu2_ep>;	}; };	// (B) Multi Element
+		};
+		ports@1 {
+			port@0 { mcodec0_ep: endpoint { remote-endpoint = <&mcpu0_ep>;	}; };	// (x) to pair
+			port@1 { mcodec1_ep: endpoint { remote-endpoint = <&codec1_ep>;	}; };	// (a) Multi Element
+			port@2 { mcodec2_ep: endpoint { remote-endpoint = <&codec2_ep>;	}; };	// (b) Multi Element
 		};
 	};
+ };
 
  CPU {
 	ports {
@@ -328,9 +328,9 @@ static struct device_node *graph_get_next_multi_ep(struct device_node **port)
 	/*
 	 * multi {
 	 *	ports {
-	 * =>	lnk:	port@0 { ... };
-	 *		port@1 { ep { ... = rep0 } };
-	 *		port@2 { ep { ... = rep1 } };
+	 * =>	lnk:	port@0 { ...		   }; // to pair
+	 *		port@1 { ep { ... = rep0 } }; // Multi Element
+	 *		port@2 { ep { ... = rep1 } }; // Multi Element
 	 *		...
 	 *	};
 	 * };
@@ -920,9 +920,9 @@ static int graph_counter(struct device_node *lnk)
 	 *
 	 * multi {
 	 *	ports {
-	 * =>		lnk:	port@0 { ... };
-	 *			port@1 { ... };
-	 *			port@2 { ... };
+	 * =>		lnk:	port@0 { ... }; // to pair
+	 *			port@1 { ... }; // Multi Element
+	 *			port@2 { ... }; // Multi Element
 	 *			...
 	 *	};
 	 * };