ASoC: mediatek: mt8192-mt6359: support audio over DP

If the DTS property is specified, the DP bridge should populate a
"hdmi-codec" platform device (sound/soc/codecs/hdmi-codec.c).

The "hdmi-codec" device is the communication relayer between the ASoC
machine driver and the DP bridge.  For example:
- Notifies DP bridge when setting hw_param.
- Notifies ASoC when jack detection events.

Signed-off-by: Tzung-Bi Shih <tzungbi@google.com>
Link: https://lore.kernel.org/r/20210120080850.699354-6-tzungbi@google.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/mediatek/mt8192/mt8192-mt6359-rt1015-rt5682.c

@@ -33,6 +33,7 @@
 
 struct mt8192_mt6359_priv {
 	struct snd_soc_jack headset_jack;
+	struct snd_soc_jack hdmi_jack;
 };
 
 static int mt8192_rt1015_i2s_hw_params(struct snd_pcm_substream *substream,
@@ -329,6 +330,23 @@ static int mt8192_rt5682_init(struct snd_soc_pcm_runtime *rtd)
 	return snd_soc_component_set_jack(cmpnt_codec, jack, NULL);
 };
 
+static int mt8192_mt6359_hdmi_init(struct snd_soc_pcm_runtime *rtd)
+{
+	struct snd_soc_component *cmpnt_codec =
+		asoc_rtd_to_codec(rtd, 0)->component;
+	struct mt8192_mt6359_priv *priv = snd_soc_card_get_drvdata(rtd->card);
+	int ret;
+
+	ret = snd_soc_card_jack_new(rtd->card, "HDMI Jack", SND_JACK_LINEOUT,
+				    &priv->hdmi_jack, NULL, 0);
+	if (ret) {
+		dev_err(rtd->dev, "HDMI Jack creation failed: %d\n", ret);
+		return ret;
+	}
+
+	return snd_soc_component_set_jack(cmpnt_codec, &priv->hdmi_jack, NULL);
+}
+
 static int mt8192_i2s_hw_params_fixup(struct snd_soc_pcm_runtime *rtd,
 				      struct snd_pcm_hw_params *params)
 {
@@ -600,7 +618,7 @@ SND_SOC_DAILINK_DEFS(pcm2,
 
 SND_SOC_DAILINK_DEFS(tdm,
 		     DAILINK_COMP_ARRAY(COMP_CPU("TDM")),
-		     DAILINK_COMP_ARRAY(COMP_DUMMY()),
+		     DAILINK_COMP_ARRAY(COMP_CODEC(NULL, "i2s-hifi")),
 		     DAILINK_COMP_ARRAY(COMP_EMPTY()));
 
 static struct snd_soc_dai_link mt8192_mt6359_dai_links[] = {
@@ -936,8 +954,14 @@ static struct snd_soc_dai_link mt8192_mt6359_dai_links[] = {
 	{
 		.name = "TDM",
 		.no_pcm = 1,
+		.dai_fmt = SND_SOC_DAIFMT_DSP_A |
+			   SND_SOC_DAIFMT_IB_NF |
+			   SND_SOC_DAIFMT_CBM_CFM,
 		.dpcm_playback = 1,
 		.ignore_suspend = 1,
+		.be_hw_params_fixup = mt8192_i2s_hw_params_fixup,
+		.ignore = 1,
+		.init = mt8192_mt6359_hdmi_init,
 		SND_SOC_DAILINK_REG(tdm),
 	},
 };
@@ -948,6 +972,7 @@ mt8192_mt6359_rt1015_rt5682_widgets[] = {
 	SND_SOC_DAPM_SPK("Right Spk", NULL),
 	SND_SOC_DAPM_HP("Headphone Jack", NULL),
 	SND_SOC_DAPM_MIC("Headset Mic", NULL),
+	SND_SOC_DAPM_OUTPUT("TDM Out"),
 };
 
 static const struct snd_soc_dapm_route mt8192_mt6359_rt1015_rt5682_routes[] = {
@@ -958,6 +983,8 @@ static const struct snd_soc_dapm_route mt8192_mt6359_rt1015_rt5682_routes[] = {
 	{ "Headphone Jack", NULL, "HPOL" },
 	{ "Headphone Jack", NULL, "HPOR" },
 	{ "IN1P", NULL, "Headset Mic" },
+	/* TDM */
+	{ "TDM Out", NULL, "TDM" },
 };
 
 static const struct snd_kcontrol_new mt8192_mt6359_rt1015_rt5682_controls[] = {
@@ -1031,7 +1058,7 @@ static struct snd_soc_card mt8192_mt6359_rt1015p_rt5682_card = {
 static int mt8192_mt6359_dev_probe(struct platform_device *pdev)
 {
 	struct snd_soc_card *card;
-	struct device_node *platform_node;
+	struct device_node *platform_node, *hdmi_codec;
 	int ret, i;
 	struct snd_soc_dai_link *dai_link;
 	const struct of_device_id *match;
@@ -1051,6 +1078,9 @@ static int mt8192_mt6359_dev_probe(struct platform_device *pdev)
 	card = (struct snd_soc_card *)match->data;
 	card->dev = &pdev->dev;
 
+	hdmi_codec = of_parse_phandle(pdev->dev.of_node,
+				      "mediatek,hdmi-codec", 0);
+
 	for_each_card_prelinks(card, i, dai_link) {
 		if (strcmp(dai_link->name, "I2S3") == 0) {
 			if (card == &mt8192_mt6359_rt1015_rt5682_card) {
@@ -1077,6 +1107,11 @@ static int mt8192_mt6359_dev_probe(struct platform_device *pdev)
 			}
 		}
 
+		if (hdmi_codec && strcmp(dai_link->name, "TDM") == 0) {
+			dai_link->codecs->of_node = hdmi_codec;
+			dai_link->ignore = 0;
+		}
+
 		if (!dai_link->platforms->name)
 			dai_link->platforms->of_node = platform_node;
 	}