ASoC: soc-dai: add snd_soc_dai_probe()

Current ALSA SoC is directly using dai->driver->xxx,
thus, it has deep nested bracket, and it makes code unreadable.
This patch adds new snd_soc_dai_probe() and use it.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87k1cahn26.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

include/sound/soc-dai.h

@@ -164,6 +164,7 @@ snd_pcm_sframes_t snd_soc_dai_delay(struct snd_soc_dai *dai,
 				    struct snd_pcm_substream *substream);
 void snd_soc_dai_suspend(struct snd_soc_dai *dai);
 void snd_soc_dai_resume(struct snd_soc_dai *dai);
+int snd_soc_dai_probe(struct snd_soc_dai *dai);
 
 struct snd_soc_dai_ops {
 	/*

sound/soc/soc-core.c

@@ -1434,18 +1434,17 @@ static int soc_probe_link_components(struct snd_soc_card *card,
 
 static int soc_probe_dai(struct snd_soc_dai *dai, int order)
 {
+	int ret;
+
 	if (dai->probed ||
 	    dai->driver->probe_order != order)
 		return 0;
 
-	if (dai->driver->probe) {
-		int ret = dai->driver->probe(dai);
-
-		if (ret < 0) {
-			dev_err(dai->dev, "ASoC: failed to probe DAI %s: %d\n",
-				dai->name, ret);
-			return ret;
-		}
+	ret = snd_soc_dai_probe(dai);
+	if (ret < 0) {
+		dev_err(dai->dev, "ASoC: failed to probe DAI %s: %d\n",
+			dai->name, ret);
+		return ret;
 	}
 
 	dai->probed = 1;

sound/soc/soc-dai.c

@@ -365,3 +365,10 @@ void snd_soc_dai_resume(struct snd_soc_dai *dai)
 	if (dai->driver->resume)
 		dai->driver->resume(dai);
 }
+
+int snd_soc_dai_probe(struct snd_soc_dai *dai)
+{
+	if (dai->driver->probe)
+		return dai->driver->probe(dai);
+	return 0;
+}