ASoC: Intel: skl_hda_dsp_generic: add DMIC support

Add dmic dai links using naming conventions used in
previous machine drivers.

Tested on whiskylake & icelake with SOF driver. Due
to a missing topology file, the DMIC functionality
could not be tested with the Skylake driver but was
tested for non-regressions on a GeminiLake platform
without DMICs.
Signed-off-by: Rander Wang <rander.wang@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/boards/skl_hda_dsp_common.c

@@ -78,7 +78,6 @@ struct snd_soc_dai_link skl_hda_be_dai_links[HDA_DSP_MAX_BE_DAI_LINKS] = {
 		.platform_name = "0000:00:1f.3",
 		.dpcm_playback = 1,
 		.dpcm_capture = 1,
-		.init = NULL,
 		.no_pcm = 1,
 	},
 	{
@@ -90,7 +89,26 @@ struct snd_soc_dai_link skl_hda_be_dai_links[HDA_DSP_MAX_BE_DAI_LINKS] = {
 		.platform_name = "0000:00:1f.3",
 		.dpcm_playback = 1,
 		.dpcm_capture = 1,
-		.init = NULL,
+		.no_pcm = 1,
+	},
+	{
+		.name = "dmic01",
+		.id = 6,
+		.cpu_dai_name = "DMIC01 Pin",
+		.codec_name = "dmic-codec",
+		.codec_dai_name = "dmic-hifi",
+		.platform_name = "0000:00:1f.3",
+		.dpcm_capture = 1,
+		.no_pcm = 1,
+	},
+	{
+		.name = "dmic16k",
+		.id = 7,
+		.cpu_dai_name = "DMIC16k Pin",
+		.codec_name = "dmic-codec",
+		.codec_dai_name = "dmic-hifi",
+		.platform_name = "0000:00:1f.3",
+		.dpcm_capture = 1,
 		.no_pcm = 1,
 	},
 };

sound/soc/intel/boards/skl_hda_dsp_common.h

@@ -15,7 +15,7 @@
 #include <sound/core.h>
 #include <sound/jack.h>
 
-#define HDA_DSP_MAX_BE_DAI_LINKS 5
+#define HDA_DSP_MAX_BE_DAI_LINKS 7
 
 struct skl_hda_hdmi_pcm {
 	struct list_head head;

sound/soc/intel/boards/skl_hda_dsp_generic.c

@@ -97,6 +97,9 @@ static struct snd_soc_card hda_soc_card = {
 };
 
 #define IDISP_DAI_COUNT		3
+#define HDAC_DAI_COUNT		2
+#define DMIC_DAI_COUNT		2
+
 /* there are two routes per iDisp output */
 #define IDISP_ROUTE_COUNT	(IDISP_DAI_COUNT * 2)
 #define IDISP_CODEC_MASK	0x4
@@ -112,8 +115,20 @@ static int skl_hda_fill_card_info(struct snd_soc_acpi_mach_params *mach_params)
 	codec_count = hweight_long(codec_mask);
 
 	if (codec_count == 1 && codec_mask & IDISP_CODEC_MASK) {
-		num_links = IDISP_DAI_COUNT;
+		num_links = IDISP_DAI_COUNT + DMIC_DAI_COUNT;
 		num_route = IDISP_ROUTE_COUNT;
+
+		/*
+		 * rearrange the dai link array and make the
+		 * dmic dai links follow idsp dai links for only
+		 * num_links of dai links need to be registered
+		 * to ASoC.
+		 */
+		for (i = 0; i < DMIC_DAI_COUNT; i++) {
+			skl_hda_be_dai_links[IDISP_DAI_COUNT + i] =
+				skl_hda_be_dai_links[IDISP_DAI_COUNT +
+					HDAC_DAI_COUNT + i];
+		}
 	} else if (codec_count == 2 && codec_mask & IDISP_CODEC_MASK) {
 		num_links = ARRAY_SIZE(skl_hda_be_dai_links);
 		num_route = ARRAY_SIZE(skl_hda_map),