ASoC: Intel: Boards: tgl_max98373: Add BT offload support

BT audio offload is internally configured with virtual GPIOs,
the port assignment is fixed on SSP2 for TGL/ADL platforms.
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Signed-off-by: Yong Zhi <yong.zhi@intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20210505163705.305616-2-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/boards/sof_rt5682.c

@@ -50,6 +50,13 @@
 #define SOF_MAX98373_SPEAKER_AMP_PRESENT	BIT(17)
 #define SOF_MAX98360A_SPEAKER_AMP_PRESENT	BIT(18)
 
+/* BT audio offload: reserve 3 bits for future */
+#define SOF_BT_OFFLOAD_SSP_SHIFT		19
+#define SOF_BT_OFFLOAD_SSP_MASK		(GENMASK(21, 19))
+#define SOF_BT_OFFLOAD_SSP(quirk)	\
+	(((quirk) << SOF_BT_OFFLOAD_SSP_SHIFT) & SOF_BT_OFFLOAD_SSP_MASK)
+#define SOF_SSP_BT_OFFLOAD_PRESENT		BIT(22)
+
 /* Default: MCLK on, MCLK 19.2M, SSP0  */
 static unsigned long sof_rt5682_quirk = SOF_RT5682_MCLK_EN |
 					SOF_RT5682_SSP_CODEC(0);
@@ -591,6 +598,13 @@ static struct snd_soc_dai_link_component rt1015_components[] = {
 	},
 };
 
+static struct snd_soc_dai_link_component dummy_component[] = {
+	{
+		.name = "snd-soc-dummy",
+		.dai_name = "snd-soc-dummy-dai",
+	}
+};
+
 static struct snd_soc_dai_link *sof_card_dai_links_create(struct device *dev,
 							  int ssp_codec,
 							  int ssp_amp,
@@ -780,6 +794,31 @@ static struct snd_soc_dai_link *sof_card_dai_links_create(struct device *dev,
 			if (!links[id].cpus->dai_name)
 				goto devm_err;
 		}
+		id++;
+	}
+
+	/* BT audio offload */
+	if (sof_rt5682_quirk & SOF_SSP_BT_OFFLOAD_PRESENT) {
+		int port = (sof_rt5682_quirk & SOF_BT_OFFLOAD_SSP_MASK) >>
+				SOF_BT_OFFLOAD_SSP_SHIFT;
+
+		links[id].id = id;
+		links[id].cpus = &cpus[id];
+		links[id].cpus->dai_name = devm_kasprintf(dev, GFP_KERNEL,
+							  "SSP%d Pin", port);
+		if (!links[id].cpus->dai_name)
+			goto devm_err;
+		links[id].name = devm_kasprintf(dev, GFP_KERNEL, "SSP%d-BT", port);
+		if (!links[id].name)
+			goto devm_err;
+		links[id].codecs = dummy_component;
+		links[id].num_codecs = ARRAY_SIZE(dummy_component);
+		links[id].platforms = platform_component;
+		links[id].num_platforms = ARRAY_SIZE(platform_component);
+		links[id].dpcm_playback = 1;
+		links[id].dpcm_capture = 1;
+		links[id].no_pcm = 1;
+		links[id].num_cpus = 1;
 	}
 
 	return links;
@@ -869,6 +908,9 @@ static int sof_audio_probe(struct platform_device *pdev)
 	else if (sof_rt5682_quirk & SOF_RT1015P_SPEAKER_AMP_PRESENT)
 		sof_rt1015p_codec_conf(&sof_audio_card_rt5682);
 
+	if (sof_rt5682_quirk & SOF_SSP_BT_OFFLOAD_PRESENT)
+		sof_audio_card_rt5682.num_links++;
+
 	dai_links = sof_card_dai_links_create(&pdev->dev, ssp_codec, ssp_amp,
 					      dmic_be_num, hdmi_num);
 	if (!dai_links)