ASoC: soc-core: enable "dai-format" on snd_soc_of_parse_daifmt()

Current snd_soc_of_parse_daifmt() detects [prefix]format, but
"format" was unclear in some case. This patch checks "dai-format"
first, and try to check "[prefix]format" if "dai-format" was not
exist.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/soc-core.c

@@ -3960,11 +3960,15 @@ unsigned int snd_soc_of_parse_daifmt(struct device_node *np,
 		prefix = "";
 
 	/*
-	 * check "[prefix]format = xxx"
+	 * check "dai-format = xxx"
+	 * or    "[prefix]format = xxx"
 	 * SND_SOC_DAIFMT_FORMAT_MASK area
 	 */
+	ret = of_property_read_string(np, "dai-format", &str);
+	if (ret < 0) {
 		snprintf(prop, sizeof(prop), "%sformat", prefix);
 		ret = of_property_read_string(np, prop, &str);
+	}
 	if (ret == 0) {
 		for (i = 0; i < ARRAY_SIZE(of_fmt_table); i++) {
 			if (strcmp(str, of_fmt_table[i].name) == 0) {