ASoC: amd: acp: Add DMIC machine driver ops

Add dmic ops and startup callback to add snd_pcm_hw_constraint for
pdm related device node.
Signed-off-by: NAjit Kumar Pandey <AjitKumar.Pandey@amd.com>
Link: https://lore.kernel.org/r/20220222124213.721224-4-AjitKumar.Pandey@amd.comSigned-off-by: NMark Brown <broonie@kernel.org>

sound/soc/amd/acp/acp-mach-common.c

@@ -291,6 +291,32 @@ static const struct snd_soc_ops acp_card_rt5682s_ops = {
 	.shutdown = acp_card_shutdown,
 };
 
+static const unsigned int dmic_channels[] = {
+	DUAL_CHANNEL, FOUR_CHANNEL,
+};
+
+static const struct snd_pcm_hw_constraint_list dmic_constraints_channels = {
+	.count = ARRAY_SIZE(dmic_channels),
+	.list = dmic_channels,
+	.mask = 0,
+};
+
+static int acp_card_dmic_startup(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+
+	snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
+				   &dmic_constraints_channels);
+	snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
+				   &constraints_rates);
+
+	return 0;
+}
+
+static const struct snd_soc_ops acp_card_dmic_ops = {
+	.startup = acp_card_dmic_startup,
+};
+
 /* Declare RT1019 codec components */
 SND_SOC_DAILINK_DEF(rt1019,
 	DAILINK_COMP_ARRAY(COMP_CODEC("i2c-10EC1019:00", "rt1019-aif"),
@@ -633,6 +659,7 @@ int acp_legacy_dai_links_create(struct snd_soc_card *card)
 		links[i].num_cpus = ARRAY_SIZE(pdm_dmic);
 		links[i].platforms = platform_component;
 		links[i].num_platforms = ARRAY_SIZE(platform_component);
+		links[i].ops = &acp_card_dmic_ops;
 		links[i].dpcm_capture = 1;
 	}