diff --git a/sound/soc/generic/audio-graph-card2.c b/sound/soc/generic/audio-graph-card2.c
index 0202ed0ee78e..6894bb936cfd 100644
--- a/sound/soc/generic/audio-graph-card2.c
+++ b/sound/soc/generic/audio-graph-card2.c
@@ -778,6 +778,18 @@ static void graph_link_init(struct simple_util_priv *priv,
 	graph_parse_daifmt(ports_cpu,	&daifmt);
 	graph_parse_daifmt(ports_codec,	&daifmt);
 	graph_parse_daifmt(lnk,		&daifmt);
+	if (daifmt) {
+		struct device *dev = simple_priv_to_dev(priv);
+
+		/*
+		 * Recommend to use Auto Select by using .auto_selectable_formats.
+		 * linux/sound/soc/renesas/rcar/core.c can be good sample for it.
+		 *
+		 * One note is that Audio Graph Card2 still keeps compatible to set
+		 * DAI format via DT.
+		 */
+		dev_warn_once(dev, "use .auto_selectable_formats on each corresponding CPU/Codec driver");
+	}
 
 	graph_util_parse_link_direction(lnk,		&playback_only, &capture_only);
 	graph_util_parse_link_direction(ports_cpu,	&playback_only, &capture_only);