ASoC: mediatek: address dai link array entries by enum

This should be more robust to future changes than adressing
array entries by index number.
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: NMark Brown <broonie@kernel.org>

sound/soc/mediatek/mt8173-rt5650-rt5676.c

@@ -131,10 +131,17 @@ static struct snd_soc_dai_link_component mt8173_rt5650_rt5676_codecs[] = {
 	},
 };
 
+enum {
+	DAI_LINK_PLAYBACK,
+	DAI_LINK_CAPTURE,
+	DAI_LINK_CODEC_I2S,
+	DAI_LINK_INTERCODEC
+};
+
 /* Digital audio interface glue - connects codec <---> CPU */
 static struct snd_soc_dai_link mt8173_rt5650_rt5676_dais[] = {
 	/* Front End DAI links */
-	{
+	[DAI_LINK_PLAYBACK] = {
 		.name = "rt5650_rt5676 Playback",
 		.stream_name = "rt5650_rt5676 Playback",
 		.cpu_dai_name = "DL1",
@@ -144,7 +151,7 @@ static struct snd_soc_dai_link mt8173_rt5650_rt5676_dais[] = {
 		.dynamic = 1,
 		.dpcm_playback = 1,
 	},
-	{
+	[DAI_LINK_CAPTURE] = {
 		.name = "rt5650_rt5676 Capture",
 		.stream_name = "rt5650_rt5676 Capture",
 		.cpu_dai_name = "VUL",
@@ -156,7 +163,7 @@ static struct snd_soc_dai_link mt8173_rt5650_rt5676_dais[] = {
 	},
 
 	/* Back End DAI links */
-	{
+	[DAI_LINK_CODEC_I2S] = {
 		.name = "Codec",
 		.cpu_dai_name = "I2S",
 		.no_pcm = 1,
@@ -170,7 +177,8 @@ static struct snd_soc_dai_link mt8173_rt5650_rt5676_dais[] = {
 		.dpcm_playback = 1,
 		.dpcm_capture = 1,
 	},
-	{ /* rt5676 <-> rt5650 intercodec link: Sets rt5676 I2S2 as master */
+	/* rt5676 <-> rt5650 intercodec link: Sets rt5676 I2S2 as master */
+	[DAI_LINK_INTERCODEC] = {
 		.name = "rt5650_rt5676 intercodec",
 		.stream_name = "rt5650_rt5676 intercodec",
 		.cpu_dai_name = "snd-soc-dummy-dai",
@@ -240,7 +248,7 @@ static int mt8173_rt5650_rt5676_dev_probe(struct platform_device *pdev)
 	mt8173_rt5650_rt5676_codec_conf[0].of_node =
 		mt8173_rt5650_rt5676_codecs[1].of_node;
 
-	mt8173_rt5650_rt5676_dais[3].codec_of_node =
+	mt8173_rt5650_rt5676_dais[DAI_LINK_INTERCODEC].codec_of_node =
 		mt8173_rt5650_rt5676_codecs[1].of_node;
 
 	card->dev = &pdev->dev;