ASoC: Intel: boards: Add IV feedback route for nau88l25_ssm4567 machine

SSM4567 supports IV feedback for feedback to the speaker
protection algorithm
Signed-off-by: Sathya Prakash M R <sathya.prakash.m.r@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/boards/skl_nau88l25_ssm4567.c

@@ -133,6 +133,9 @@ static const struct snd_soc_dapm_route skylake_map[] = {
 	{ "Right Playback", NULL, "ssp0 Tx"},
 	{ "ssp0 Tx", NULL, "codec0_out"},
 
+	/* IV feedback path */
+	{ "codec0_lp_in", NULL, "ssp0 Rx"},
+
 	{ "Playback", NULL, "ssp1 Tx"},
 	{ "ssp1 Tx", NULL, "codec1_out"},
 
@@ -154,6 +157,14 @@ static const struct snd_soc_dapm_route skylake_map[] = {
 	{ "Headset Mic", NULL, "Platform Clock" },
 };
 
+static const struct snd_soc_pcm_stream skl_ssm4567_loop_params = {
+	.formats = SNDRV_PCM_FMTBIT_S24_LE,
+	.rate_min = 48000,
+	.rate_max = 48000,
+	.channels_min = 4,
+	.channels_max = 4,
+};
+
 static struct snd_soc_codec_conf ssm4567_codec_conf[] = {
 	{
 		.dev_name = "i2c-INT343B:00",
@@ -499,6 +510,16 @@ static struct snd_soc_dai_link skylake_dais[] = {
 		.nonatomic = 1,
 		.dynamic = 1,
 	},
+	/* Codec-codec link */
+	{
+		.name = "Skylake IV loop",
+		.stream_name = "SKL IV Loop",
+		.cpu_dai_name = "SSP0 Pin",
+		.platform_name = "0000:00:1f.3",
+		.codecs = ssm4567_codec_components,
+		.num_codecs = ARRAY_SIZE(ssm4567_codec_components),
+		.params = &skl_ssm4567_loop_params,
+	},
 
 	/* Back End DAI links */
 	{