ASoC: add and use asoc_dummy_dlc

Merge series from Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>:

Many ASoC drivers are using dummy DAI.
I have 2 concern about it. 1st one is there is no guarantee that local
strings ("snd-soc-dummy-dai",  "snd-soc-dummy") are kept until the card
was binded if it was added at subfunction.
2nd one is we can use common snd_soc_dai_link_component for it.
This patch-set adds common asoc_dummy_dlc, and use it.

include/sound/simple_card_utils.h

@@ -73,7 +73,6 @@ struct asoc_simple_priv {
 	struct snd_soc_dai_link *dai_link;
 	struct asoc_simple_dai *dais;
 	struct snd_soc_dai_link_component *dlcs;
-	struct snd_soc_dai_link_component dummy;
 	struct snd_soc_codec_conf *codec_conf;
 	struct gpio_desc *pa_gpio;
 	const struct snd_soc_ops *ops;

include/sound/soc.h

@@ -878,6 +878,7 @@ asoc_link_to_platform(struct snd_soc_dai_link *link, int n) {
 #define COMP_DUMMY()			{ .name = "snd-soc-dummy", .dai_name = "snd-soc-dummy-dai", }
 
 extern struct snd_soc_dai_link_component null_dailink_component[0];
+extern struct snd_soc_dai_link_component asoc_dummy_dlc;
 
 
 struct snd_soc_codec_conf {

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

@@ -795,13 +795,6 @@ SND_SOC_DAILINK_DEF(dmic_codec,
 		DAILINK_COMP_ARRAY(COMP_CODEC("dmic-codec", "dmic-hifi")));
 
 /* Declare ACP CPU components */
-static struct snd_soc_dai_link_component dummy_codec[] = {
-	{
-		.name = "snd-soc-dummy",
-		.dai_name = "snd-soc-dummy-dai",
-	}
-};
-
 static struct snd_soc_dai_link_component platform_component[] = {
 	{
 		 .name = "acp_asoc_renoir.0",
@@ -912,8 +905,8 @@ int acp_sofdsp_dai_links_create(struct snd_soc_card *card)
 		links[i].no_pcm = 1;
 		if (!drv_data->hs_codec_id) {
 			/* Use dummy codec if codec id not specified */
-			links[i].codecs = dummy_codec;
-			links[i].num_codecs = ARRAY_SIZE(dummy_codec);
+			links[i].codecs = &asoc_dummy_dlc;
+			links[i].num_codecs = 1;
 		}
 		if (drv_data->hs_codec_id == RT5682) {
 			links[i].codecs = rt5682;
@@ -943,8 +936,8 @@ int acp_sofdsp_dai_links_create(struct snd_soc_card *card)
 		links[i].no_pcm = 1;
 		if (!drv_data->hs_codec_id) {
 			/* Use dummy codec if codec id not specified */
-			links[i].codecs = dummy_codec;
-			links[i].num_codecs = ARRAY_SIZE(dummy_codec);
+			links[i].codecs = &asoc_dummy_dlc;
+			links[i].num_codecs = 1;
 		}
 		if (drv_data->hs_codec_id == NAU8825) {
 			links[i].codecs = nau8825;
@@ -973,8 +966,8 @@ int acp_sofdsp_dai_links_create(struct snd_soc_card *card)
 		links[i].no_pcm = 1;
 		if (!drv_data->amp_codec_id) {
 			/* Use dummy codec if codec id not specified */
-			links[i].codecs = dummy_codec;
-			links[i].num_codecs = ARRAY_SIZE(dummy_codec);
+			links[i].codecs = &asoc_dummy_dlc;
+			links[i].num_codecs = 1;
 		}
 		if (drv_data->amp_codec_id == RT1019) {
 			links[i].codecs = rt1019;
@@ -1005,8 +998,8 @@ int acp_sofdsp_dai_links_create(struct snd_soc_card *card)
 		links[i].no_pcm = 1;
 		if (!drv_data->amp_codec_id) {
 			/* Use dummy codec if codec id not specified */
-			links[i].codecs = dummy_codec;
-			links[i].num_codecs = ARRAY_SIZE(dummy_codec);
+			links[i].codecs = &asoc_dummy_dlc;
+			links[i].num_codecs = 1;
 		}
 		if (drv_data->amp_codec_id == MAX98360A) {
 			links[i].codecs = max98360a;
@@ -1076,8 +1069,8 @@ int acp_legacy_dai_links_create(struct snd_soc_card *card)
 		links[i].dpcm_capture = 1;
 		if (!drv_data->hs_codec_id) {
 			/* Use dummy codec if codec id not specified */
-			links[i].codecs = dummy_codec;
-			links[i].num_codecs = ARRAY_SIZE(dummy_codec);
+			links[i].codecs = &asoc_dummy_dlc;
+			links[i].num_codecs = 1;
 		}
 		if (drv_data->hs_codec_id == RT5682) {
 			links[i].codecs = rt5682;
@@ -1110,8 +1103,8 @@ int acp_legacy_dai_links_create(struct snd_soc_card *card)
 		links[i].dpcm_capture = 1;
 		if (!drv_data->hs_codec_id) {
 			/* Use dummy codec if codec id not specified */
-			links[i].codecs = dummy_codec;
-			links[i].num_codecs = ARRAY_SIZE(dummy_codec);
+			links[i].codecs = &asoc_dummy_dlc;
+			links[i].num_codecs = 1;
 		}
 		if (drv_data->hs_codec_id == NAU8825) {
 			links[i].codecs = nau8825;
@@ -1138,8 +1131,8 @@ int acp_legacy_dai_links_create(struct snd_soc_card *card)
 		links[i].dpcm_playback = 1;
 		if (!drv_data->amp_codec_id) {
 			/* Use dummy codec if codec id not specified */
-			links[i].codecs = dummy_codec;
-			links[i].num_codecs = ARRAY_SIZE(dummy_codec);
+			links[i].codecs = &asoc_dummy_dlc;
+			links[i].num_codecs = 1;
 		}
 		if (drv_data->amp_codec_id == RT1019) {
 			links[i].codecs = rt1019;
@@ -1173,8 +1166,8 @@ int acp_legacy_dai_links_create(struct snd_soc_card *card)
 		links[i].dpcm_playback = 1;
 		if (!drv_data->amp_codec_id) {
 			/* Use dummy codec if codec id not specified */
-			links[i].codecs = dummy_codec;
-			links[i].num_codecs = ARRAY_SIZE(dummy_codec);
+			links[i].codecs = &asoc_dummy_dlc;
+			links[i].num_codecs = 1;
 		}
 		if (drv_data->amp_codec_id == MAX98360A) {
 			links[i].codecs = max98360a;
@@ -1201,8 +1194,8 @@ int acp_legacy_dai_links_create(struct snd_soc_card *card)
 			links[i].num_codecs = ARRAY_SIZE(dmic_codec);
 		} else {
 			/* Use dummy codec if codec id not specified */
-			links[i].codecs = dummy_codec;
-			links[i].num_codecs = ARRAY_SIZE(dummy_codec);
+			links[i].codecs = &asoc_dummy_dlc;
+			links[i].num_codecs = 1;
 		}
 		links[i].cpus = pdm_dmic;
 		links[i].num_cpus = ARRAY_SIZE(pdm_dmic);

sound/soc/atmel/atmel-classd.c

@@ -473,21 +473,19 @@ static int atmel_classd_asoc_card_init(struct device *dev,
 	if (!dai_link)
 		return -ENOMEM;
 
-	comp = devm_kzalloc(dev, 2 * sizeof(*comp), GFP_KERNEL);
+	comp = devm_kzalloc(dev, sizeof(*comp), GFP_KERNEL);
 	if (!comp)
 		return -ENOMEM;
 
-	dai_link->cpus		= &comp[0];
-	dai_link->codecs	= &comp[1];
+	dai_link->cpus		= comp;
+	dai_link->codecs	= &asoc_dummy_dlc;
 
 	dai_link->num_cpus	= 1;
 	dai_link->num_codecs	= 1;
 
 	dai_link->name			= "CLASSD";
 	dai_link->stream_name		= "CLASSD PCM";
-	dai_link->codecs->dai_name	= "snd-soc-dummy-dai";
 	dai_link->cpus->dai_name	= dev_name(dev);
-	dai_link->codecs->name		= "snd-soc-dummy";
 
 	card->dai_link	= dai_link;
 	card->num_links	= 1;

sound/soc/atmel/atmel-pdmic.c

@@ -496,21 +496,19 @@ static int atmel_pdmic_asoc_card_init(struct device *dev,
 	if (!dai_link)
 		return -ENOMEM;
 
-	comp = devm_kzalloc(dev, 2 * sizeof(*comp), GFP_KERNEL);
+	comp = devm_kzalloc(dev, sizeof(*comp), GFP_KERNEL);
 	if (!comp)
 		return -ENOMEM;
 
-	dai_link->cpus		= &comp[0];
-	dai_link->codecs	= &comp[1];
+	dai_link->cpus		= comp;
+	dai_link->codecs	= &asoc_dummy_dlc;
 
 	dai_link->num_cpus	= 1;
 	dai_link->num_codecs	= 1;
 
 	dai_link->name			= "PDMIC";
 	dai_link->stream_name		= "PDMIC PCM";
-	dai_link->codecs->dai_name	= "snd-soc-dummy-dai";
 	dai_link->cpus->dai_name	= dev_name(dev);
-	dai_link->codecs->name		= "snd-soc-dummy";
 
 	card->dai_link	= dai_link;
 	card->num_links	= 1;

sound/soc/fsl/imx-audmix.c

@@ -207,8 +207,8 @@ static int imx_audmix_probe(struct platform_device *pdev)
 	for (i = 0; i < num_dai; i++) {
 		struct snd_soc_dai_link_component *dlc;
 
-		/* for CPU/Codec x 2 */
-		dlc = devm_kcalloc(&pdev->dev, 4, sizeof(*dlc), GFP_KERNEL);
+		/* for CPU x 2 */
+		dlc = devm_kcalloc(&pdev->dev, 2, sizeof(*dlc), GFP_KERNEL);
 		if (!dlc)
 			return -ENOMEM;
 
@@ -244,7 +244,7 @@ static int imx_audmix_probe(struct platform_device *pdev)
 		 */
 		priv->dai[i].cpus	=
 		priv->dai[i].platforms	= &dlc[0];
-		priv->dai[i].codecs	= &dlc[1];
+		priv->dai[i].codecs	= &asoc_dummy_dlc;
 
 		priv->dai[i].num_cpus = 1;
 		priv->dai[i].num_codecs = 1;
@@ -252,8 +252,6 @@ static int imx_audmix_probe(struct platform_device *pdev)
 
 		priv->dai[i].name = dai_name;
 		priv->dai[i].stream_name = "HiFi-AUDMIX-FE";
-		priv->dai[i].codecs->dai_name = "snd-soc-dummy-dai";
-		priv->dai[i].codecs->name = "snd-soc-dummy";
 		priv->dai[i].cpus->of_node = args.np;
 		priv->dai[i].cpus->dai_name = dev_name(&cpu_pdev->dev);
 		priv->dai[i].dynamic = 1;
@@ -270,15 +268,13 @@ static int imx_audmix_probe(struct platform_device *pdev)
 		be_cp = devm_kasprintf(&pdev->dev, GFP_KERNEL,
 				       "AUDMIX-Capture-%d", i);
 
-		priv->dai[num_dai + i].cpus	= &dlc[2];
-		priv->dai[num_dai + i].codecs	= &dlc[3];
+		priv->dai[num_dai + i].cpus	= &dlc[1];
+		priv->dai[num_dai + i].codecs	= &asoc_dummy_dlc;
 
 		priv->dai[num_dai + i].num_cpus = 1;
 		priv->dai[num_dai + i].num_codecs = 1;
 
 		priv->dai[num_dai + i].name = be_name;
-		priv->dai[num_dai + i].codecs->dai_name = "snd-soc-dummy-dai";
-		priv->dai[num_dai + i].codecs->name = "snd-soc-dummy";
 		priv->dai[num_dai + i].cpus->of_node = audmix_np;
 		priv->dai[num_dai + i].cpus->dai_name = be_name;
 		priv->dai[num_dai + i].no_pcm = 1;

sound/soc/fsl/imx-card.c

@@ -615,17 +615,8 @@ static int imx_card_parse_of(struct imx_card_data *data)
 				plat_data->type = CODEC_AK5552;
 
 		} else {
-			dlc = devm_kzalloc(dev, sizeof(*dlc), GFP_KERNEL);
-			if (!dlc) {
-				ret = -ENOMEM;
-				goto err;
-			}
-
-			link->codecs	 = dlc;
+			link->codecs	 = &asoc_dummy_dlc;
 			link->num_codecs = 1;
-
-			link->codecs->dai_name = "snd-soc-dummy-dai";
-			link->codecs->name = "snd-soc-dummy";
 		}
 
 		if (!strncmp(link->name, "HiFi-ASRC-FE", 12)) {

sound/soc/fsl/imx-rpmsg.c

@@ -92,8 +92,7 @@ static int imx_rpmsg_probe(struct platform_device *pdev)
 	/* Optional codec node */
 	ret = of_parse_phandle_with_fixed_args(np, "audio-codec", 0, 0, &args);
 	if (ret) {
-		data->dai.codecs->dai_name = "snd-soc-dummy-dai";
-		data->dai.codecs->name = "snd-soc-dummy";
+		*data->dai.codecs = asoc_dummy_dlc;
 	} else {
 		struct clk *clk;
 

sound/soc/fsl/imx-spdif.c

@@ -26,7 +26,7 @@ static int imx_spdif_audio_probe(struct platform_device *pdev)
 	}
 
 	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
-	comp = devm_kzalloc(&pdev->dev, 2 * sizeof(*comp), GFP_KERNEL);
+	comp = devm_kzalloc(&pdev->dev, sizeof(*comp), GFP_KERNEL);
 	if (!data || !comp) {
 		ret = -ENOMEM;
 		goto end;
@@ -37,8 +37,8 @@ static int imx_spdif_audio_probe(struct platform_device *pdev)
 	 * platform is using soc-generic-dmaengine-pcm
 	 */
 	data->dai.cpus		=
-	data->dai.platforms	= &comp[0];
-	data->dai.codecs	= &comp[1];
+	data->dai.platforms	= comp;
+	data->dai.codecs	= &asoc_dummy_dlc;
 
 	data->dai.num_cpus	= 1;
 	data->dai.num_codecs	= 1;
@@ -46,8 +46,6 @@ static int imx_spdif_audio_probe(struct platform_device *pdev)
 
 	data->dai.name = "S/PDIF PCM";
 	data->dai.stream_name = "S/PDIF PCM";
-	data->dai.codecs->dai_name = "snd-soc-dummy-dai";
-	data->dai.codecs->name = "snd-soc-dummy";
 	data->dai.cpus->of_node = spdif_np;
 	data->dai.playback_only = true;
 	data->dai.capture_only = true;

sound/soc/generic/simple-card-utils.c

@@ -889,11 +889,6 @@ int asoc_simple_init_priv(struct asoc_simple_priv *priv,
 	dev_dbg(dev, "link %d, dais %d, ccnf %d\n",
 		li->link, dai_num, cnf_num);
 
-	/* dummy CPU/Codec */
-	priv->dummy.of_node	= NULL;
-	priv->dummy.dai_name	= "snd-soc-dummy-dai";
-	priv->dummy.name	= "snd-soc-dummy";
-
 	priv->dai_props		= dai_props;
 	priv->dai_link		= dai_link;
 	priv->dais		= dais;
@@ -919,7 +914,7 @@ int asoc_simple_init_priv(struct asoc_simple_priv *priv,
 		} else {
 			/* DPCM Be's CPU = dummy */
 			dai_props[i].cpus	=
-			dai_link[i].cpus	= &priv->dummy;
+			dai_link[i].cpus	= &asoc_dummy_dlc;
 			dai_props[i].num.cpus	=
 			dai_link[i].num_cpus	= 1;
 		}
@@ -943,7 +938,7 @@ int asoc_simple_init_priv(struct asoc_simple_priv *priv,
 		} else {
 			/* DPCM Fe's Codec = dummy */
 			dai_props[i].codecs	=
-			dai_link[i].codecs	= &priv->dummy;
+			dai_link[i].codecs	= &asoc_dummy_dlc;
 			dai_props[i].num.codecs	=
 			dai_link[i].num_codecs	= 1;
 		}

sound/soc/intel/avs/boards/i2s_test.c

@@ -28,13 +28,11 @@ static int avs_create_dai_link(struct device *dev, const char *platform_name, in
 
 	dl->name = devm_kasprintf(dev, GFP_KERNEL, "SSP%d-Codec", ssp_port);
 	dl->cpus = devm_kzalloc(dev, sizeof(*dl->cpus), GFP_KERNEL);
-	dl->codecs = devm_kzalloc(dev, sizeof(*dl->codecs), GFP_KERNEL);
-	if (!dl->name || !dl->cpus || !dl->codecs)
+	if (!dl->name || !dl->cpus)
 		return -ENOMEM;
 
 	dl->cpus->dai_name = devm_kasprintf(dev, GFP_KERNEL, "SSP%d Pin", ssp_port);
-	dl->codecs->name = devm_kasprintf(dev, GFP_KERNEL, "snd-soc-dummy");
-	dl->codecs->dai_name = devm_kasprintf(dev, GFP_KERNEL, "snd-soc-dummy-dai");
+	dl->codecs = &asoc_dummy_dlc;
 	if (!dl->cpus->dai_name || !dl->codecs->name || !dl->codecs->dai_name)
 		return -ENOMEM;
 

sound/soc/intel/boards/ehl_rt5660.c

@@ -254,7 +254,6 @@ static void hdmi_link_init(struct snd_soc_card *card,
 			   struct sof_card_private *ctx,
 			   struct snd_soc_acpi_mach *mach)
 {
-	struct snd_soc_dai_link *link;
 	int i;
 
 	if (mach->mach_params.common_hdmi_codec_drv &&
@@ -267,11 +266,8 @@ static void hdmi_link_init(struct snd_soc_card *card,
 	 * if HDMI is not enabled in kernel config, or
 	 * hdmi codec is not supported
 	 */
-	for (i = HDMI_LINK_START; i <= HDMI_LINE_END; i++) {
-		link = &card->dai_link[i];
-		link->codecs[0].name = "snd-soc-dummy";
-		link->codecs[0].dai_name = "snd-soc-dummy-dai";
-	}
+	for (i = HDMI_LINK_START; i <= HDMI_LINE_END; i++)
+		card->dai_link[i].codecs[0] = asoc_dummy_dlc;
 }
 
 static int snd_ehl_rt5660_probe(struct platform_device *pdev)

sound/soc/intel/boards/skl_hda_dsp_generic.c

@@ -61,9 +61,6 @@ static const struct snd_soc_dapm_route skl_hda_map[] = {
 	{ "Alt Analog CPU Capture", NULL, "Alt Analog Codec Capture" },
 };
 
-SND_SOC_DAILINK_DEF(dummy_codec,
-	DAILINK_COMP_ARRAY(COMP_CODEC("snd-soc-dummy", "snd-soc-dummy-dai")));
-
 static int skl_hda_card_late_probe(struct snd_soc_card *card)
 {
 	return skl_hda_hdmi_jack_init(card);
@@ -158,9 +155,8 @@ static int skl_hda_fill_card_info(struct snd_soc_acpi_mach_params *mach_params)
 		card->num_dapm_widgets = ARRAY_SIZE(skl_hda_widgets);
 		if (!ctx->idisp_codec) {
 			for (i = 0; i < IDISP_DAI_COUNT; i++) {
-				skl_hda_be_dai_links[i].codecs = dummy_codec;
-				skl_hda_be_dai_links[i].num_codecs =
-					ARRAY_SIZE(dummy_codec);
+				skl_hda_be_dai_links[i].codecs = &asoc_dummy_dlc;
+				skl_hda_be_dai_links[i].num_codecs = 1;
 			}
 		}
 	}

sound/soc/intel/boards/sof_cs42l42.c

@@ -296,13 +296,6 @@ static struct snd_soc_dai_link_component dmic_component[] = {
 	}
 };
 
-static struct snd_soc_dai_link_component dummy_component[] = {
-	{
-		.name = "snd-soc-dummy",
-		.dai_name = "snd-soc-dummy-dai",
-	}
-};
-
 static int create_spk_amp_dai_links(struct device *dev,
 				    struct snd_soc_dai_link *links,
 				    struct snd_soc_dai_link_component *cpus,
@@ -510,8 +503,8 @@ static int create_bt_offload_dai_links(struct device *dev,
 		goto devm_err;
 
 	links[*id].id = *id;
-	links[*id].codecs = dummy_component;
-	links[*id].num_codecs = ARRAY_SIZE(dummy_component);
+	links[*id].codecs = &asoc_dummy_dlc;
+	links[*id].num_codecs = 1;
 	links[*id].platforms = platform_component;
 	links[*id].num_platforms = ARRAY_SIZE(platform_component);
 

sound/soc/intel/boards/sof_es8336.c

@@ -393,13 +393,6 @@ static struct snd_soc_dai_link_component dmic_component[] = {
 	}
 };
 
-static struct snd_soc_dai_link_component dummy_component[] = {
-	{
-		.name = "snd-soc-dummy",
-		.dai_name = "snd-soc-dummy-dai",
-	}
-};
-
 static int sof_es8336_late_probe(struct snd_soc_card *card)
 {
 	struct sof_es8336_private *priv = snd_soc_card_get_drvdata(card);
@@ -572,8 +565,8 @@ static struct snd_soc_dai_link *sof_card_dai_links_create(struct device *dev,
 			if (!links[id].name)
 				return NULL;
 			links[id].id = id + hdmi_id_offset;
-			links[id].codecs = dummy_component;
-			links[id].num_codecs = ARRAY_SIZE(dummy_component);
+			links[id].codecs = &asoc_dummy_dlc;
+			links[id].num_codecs = 1;
 			links[id].platforms = platform_component;
 			links[id].num_platforms = ARRAY_SIZE(platform_component);
 			links[id].dpcm_capture = 1;

sound/soc/intel/boards/sof_nau8825.c

@@ -346,13 +346,6 @@ static struct snd_soc_dai_link_component nau8318_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,
@@ -532,8 +525,8 @@ static struct snd_soc_dai_link *sof_card_dai_links_create(struct device *dev,
 		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].codecs = &asoc_dummy_dlc;
+		links[id].num_codecs = 1;
 		links[id].platforms = platform_component;
 		links[id].num_platforms = ARRAY_SIZE(platform_component);
 		links[id].dpcm_playback = 1;

sound/soc/intel/boards/sof_pcm512x.c

@@ -331,8 +331,7 @@ static struct snd_soc_dai_link *sof_card_dai_links_create(struct device *dev,
 				devm_kasprintf(dev, GFP_KERNEL,
 					       "intel-hdmi-hifi%d", i);
 		} else {
-			idisp_components[i - 1].name = "snd-soc-dummy";
-			idisp_components[i - 1].dai_name = "snd-soc-dummy-dai";
+			idisp_components[i - 1] = asoc_dummy_dlc;
 		}
 		if (!idisp_components[i - 1].dai_name)
 			goto devm_err;

sound/soc/intel/boards/sof_rt5682.c

@@ -607,13 +607,6 @@ static struct snd_soc_dai_link_component dmic_component[] = {
 	}
 };
 
-static struct snd_soc_dai_link_component dummy_component[] = {
-	{
-		.name = "snd-soc-dummy",
-		.dai_name = "snd-soc-dummy-dai",
-	}
-};
-
 #define IDISP_CODEC_MASK	0x4
 
 static struct snd_soc_dai_link *sof_card_dai_links_create(struct device *dev,
@@ -745,8 +738,7 @@ static struct snd_soc_dai_link *sof_card_dai_links_create(struct device *dev,
 			if (!idisp_components[i - 1].dai_name)
 				goto devm_err;
 		} else {
-			idisp_components[i - 1].name = "snd-soc-dummy";
-			idisp_components[i - 1].dai_name = "snd-soc-dummy-dai";
+			idisp_components[i - 1] = asoc_dummy_dlc;
 		}
 
 		links[id].codecs = &idisp_components[i - 1];
@@ -841,8 +833,8 @@ static struct snd_soc_dai_link *sof_card_dai_links_create(struct device *dev,
 		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].codecs = &asoc_dummy_dlc;
+		links[id].num_codecs = 1;
 		links[id].platforms = platform_component;
 		links[id].num_platforms = ARRAY_SIZE(platform_component);
 		links[id].dpcm_playback = 1;

sound/soc/intel/boards/sof_sdw.c

@@ -1488,8 +1488,7 @@ static int sof_card_dai_links_create(struct device *dev,
 			if (!idisp_components[i].dai_name)
 				return -ENOMEM;
 		} else {
-			idisp_components[i].name = "snd-soc-dummy";
-			idisp_components[i].dai_name = "snd-soc-dummy-dai";
+			idisp_components[i] = asoc_dummy_dlc;
 		}
 
 		cpu_name = devm_kasprintf(dev, GFP_KERNEL,
@@ -1514,21 +1513,13 @@ static int sof_card_dai_links_create(struct device *dev,
 		if (!name)
 			return -ENOMEM;
 
-		ssp_components = devm_kzalloc(dev, sizeof(*ssp_components),
-						GFP_KERNEL);
-		if (!ssp_components)
-			return -ENOMEM;
-
-		ssp_components->name = "snd-soc-dummy";
-		ssp_components->dai_name = "snd-soc-dummy-dai";
-
 		cpu_name = devm_kasprintf(dev, GFP_KERNEL, "SSP%d Pin", port);
 		if (!cpu_name)
 			return -ENOMEM;
 
 		cpus[cpu_id].dai_name = cpu_name;
 		init_dai_link(dev, links + link_index, be_id, name, 1, 1,
-				cpus + cpu_id, 1, ssp_components, 1, NULL, NULL);
+				cpus + cpu_id, 1, &asoc_dummy_dlc, 1, NULL, NULL);
 	}
 
 	card->dai_link = links;

sound/soc/intel/boards/sof_ssp_amp.c

@@ -167,13 +167,6 @@ static struct snd_soc_dai_link_component dmic_component[] = {
 	}
 };
 
-static struct snd_soc_dai_link_component dummy_component[] = {
-	{
-		.name = "snd-soc-dummy",
-		.dai_name = "snd-soc-dummy-dai",
-	}
-};
-
 static int sof_hdmi_init(struct snd_soc_pcm_runtime *rtd)
 {
 	struct sof_card_private *ctx = snd_soc_card_get_drvdata(rtd->card);
@@ -233,8 +226,8 @@ static struct snd_soc_dai_link *sof_card_dai_links_create(struct device *dev,
 			if (!links[id].name)
 				return NULL;
 			links[id].id = id;
-			links[id].codecs = dummy_component;
-			links[id].num_codecs = ARRAY_SIZE(dummy_component);
+			links[id].codecs = &asoc_dummy_dlc;
+			links[id].num_codecs = 1;
 			links[id].platforms = platform_component;
 			links[id].num_platforms = ARRAY_SIZE(platform_component);
 			links[id].dpcm_capture = 1;
@@ -331,8 +324,7 @@ static struct snd_soc_dai_link *sof_card_dai_links_create(struct device *dev,
 				if (!idisp_components[i - 1].dai_name)
 					goto devm_err;
 			} else {
-				idisp_components[i - 1].name = "snd-soc-dummy";
-				idisp_components[i - 1].dai_name = "snd-soc-dummy-dai";
+				idisp_components[i - 1] = asoc_dummy_dlc;
 			}
 
 			links[id].codecs = &idisp_components[i - 1];
@@ -360,8 +352,8 @@ static struct snd_soc_dai_link *sof_card_dai_links_create(struct device *dev,
 		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].codecs = &asoc_dummy_dlc;
+		links[id].num_codecs = 1;
 		links[id].platforms = platform_component;
 		links[id].num_platforms = ARRAY_SIZE(platform_component);
 		links[id].dpcm_playback = 1;

sound/soc/meson/axg-card.c

@@ -120,20 +120,18 @@ static int axg_card_add_tdm_loopback(struct snd_soc_card *card,
 	if (!lb->name)
 		return -ENOMEM;
 
-	dlc = devm_kzalloc(card->dev, 2 * sizeof(*dlc), GFP_KERNEL);
+	dlc = devm_kzalloc(card->dev, sizeof(*dlc), GFP_KERNEL);
 	if (!dlc)
 		return -ENOMEM;
 
-	lb->cpus = &dlc[0];
-	lb->codecs = &dlc[1];
+	lb->cpus = dlc;
+	lb->codecs = &asoc_dummy_dlc;
 	lb->num_cpus = 1;
 	lb->num_codecs = 1;
 
 	lb->stream_name = lb->name;
 	lb->cpus->of_node = pad->cpus->of_node;
 	lb->cpus->dai_name = "TDM Loopback";
-	lb->codecs->name = "snd-soc-dummy";
-	lb->codecs->dai_name = "snd-soc-dummy-dai";
 	lb->dpcm_capture = 1;
 	lb->no_pcm = 1;
 	lb->ops = &axg_card_tdm_be_ops;

sound/soc/meson/meson-card-utils.c

@@ -183,21 +183,13 @@ int meson_card_set_fe_link(struct snd_soc_card *card,
 			   struct device_node *node,
 			   bool is_playback)
 {
-	struct snd_soc_dai_link_component *codec;
-
-	codec = devm_kzalloc(card->dev, sizeof(*codec), GFP_KERNEL);
-	if (!codec)
-		return -ENOMEM;
-
-	link->codecs = codec;
+	link->codecs = &asoc_dummy_dlc;
 	link->num_codecs = 1;
 
 	link->dynamic = 1;
 	link->dpcm_merged_format = 1;
 	link->dpcm_merged_chan = 1;
 	link->dpcm_merged_rate = 1;
-	link->codecs->dai_name = "snd-soc-dummy-dai";
-	link->codecs->name = "snd-soc-dummy";
 
 	if (is_playback)
 		link->dpcm_playback = 1;

sound/soc/qcom/common.c

@@ -140,17 +140,8 @@ int qcom_snd_parse_of(struct snd_soc_card *card)
 			}
 		} else {
 			/* DPCM frontend */
-			dlc = devm_kzalloc(dev, sizeof(*dlc), GFP_KERNEL);
-			if (!dlc) {
-				ret = -ENOMEM;
-				goto err;
-			}
-
-			link->codecs	 = dlc;
+			link->codecs	 = &asoc_dummy_dlc;
 			link->num_codecs = 1;
-
-			link->codecs->dai_name = "snd-soc-dummy-dai";
-			link->codecs->name = "snd-soc-dummy";
 			link->dynamic = 1;
 		}
 

sound/soc/soc-topology.c

@@ -1693,10 +1693,7 @@ static int soc_tplg_fe_link_create(struct soc_tplg *tplg,
 	dlc = (struct snd_soc_dai_link_component *)(link + 1);
 
 	link->cpus	= &dlc[0];
-	link->codecs	= &dlc[1];
-
 	link->num_cpus	 = 1;
-	link->num_codecs = 1;
 
 	link->dobj.index = tplg->index;
 	link->dobj.type = SND_SOC_DOBJ_DAI_LINK;
@@ -1721,16 +1718,19 @@ static int soc_tplg_fe_link_create(struct soc_tplg *tplg,
 		}
 	}
 
-	link->codecs->name = "snd-soc-dummy";
-	link->codecs->dai_name = "snd-soc-dummy-dai";
-
 	/*
-	 * Many topology is assuming link has Platform.
-	 * This might be overwritten at soc_tplg_dai_link_load().
+	 * Many topology are assuming link has Codec / Platform, and
+	 * these might be overwritten at soc_tplg_dai_link_load().
+	 * Don't use &asoc_dummy_dlc here.
 	 */
-	link->platforms	= &dlc[2];
-	link->platforms->name = "snd-soc-dummy";
-	link->num_platforms = 1;
+	link->codecs		= &dlc[1];	/* Don't use &asoc_dummy_dlc here */
+	link->codecs->name	= "snd-soc-dummy";
+	link->codecs->dai_name	= "snd-soc-dummy-dai";
+	link->num_codecs	= 1;
+
+	link->platforms		= &dlc[2];	/* Don't use &asoc_dummy_dlc here */
+	link->platforms->name	= "snd-soc-dummy";
+	link->num_platforms	= 1;
 
 	/* enable DPCM */
 	link->dynamic = 1;

sound/soc/soc-utils.c

@@ -224,6 +224,13 @@ int snd_soc_component_is_dummy(struct snd_soc_component *component)
 		(component->driver == &dummy_codec));
 }
 
+struct snd_soc_dai_link_component asoc_dummy_dlc = {
+	.of_node	= NULL,
+	.dai_name	= "snd-soc-dummy-dai",
+	.name		= "snd-soc-dummy",
+};
+EXPORT_SYMBOL_GPL(asoc_dummy_dlc);
+
 static int snd_soc_dummy_probe(struct platform_device *pdev)
 {
 	int ret;

sound/soc/sof/nocodec.c

@@ -32,7 +32,7 @@ static int sof_nocodec_bes_setup(struct device *dev,
 
 	/* set up BE dai_links */
 	for (i = 0; i < link_num; i++) {
-		dlc = devm_kcalloc(dev, 3, sizeof(*dlc), GFP_KERNEL);
+		dlc = devm_kcalloc(dev, 2, sizeof(*dlc), GFP_KERNEL);
 		if (!dlc)
 			return -ENOMEM;
 
@@ -44,8 +44,8 @@ static int sof_nocodec_bes_setup(struct device *dev,
 		links[i].stream_name = links[i].name;
 
 		links[i].cpus = &dlc[0];
-		links[i].codecs = &dlc[1];
-		links[i].platforms = &dlc[2];
+		links[i].codecs = &asoc_dummy_dlc;
+		links[i].platforms = &dlc[1];
 
 		links[i].num_cpus = 1;
 		links[i].num_codecs = 1;
@@ -55,8 +55,6 @@ static int sof_nocodec_bes_setup(struct device *dev,
 		links[i].no_pcm = 1;
 		links[i].cpus->dai_name = drv[i].name;
 		links[i].platforms->name = dev_name(dev->parent);
-		links[i].codecs->dai_name = "snd-soc-dummy-dai";
-		links[i].codecs->name = "snd-soc-dummy";
 		if (drv[i].playback.channels_min)
 			links[i].dpcm_playback = 1;
 		if (drv[i].capture.channels_min)

sound/soc/ti/omap-hdmi.c

@@ -365,19 +365,17 @@ static int omap_hdmi_audio_probe(struct platform_device *pdev)
 	if (!card->dai_link)
 		return -ENOMEM;
 
-	compnent = devm_kzalloc(dev, 2 * sizeof(*compnent), GFP_KERNEL);
+	compnent = devm_kzalloc(dev, sizeof(*compnent), GFP_KERNEL);
 	if (!compnent)
 		return -ENOMEM;
-	card->dai_link->cpus		= &compnent[0];
+	card->dai_link->cpus		= compnent;
 	card->dai_link->num_cpus	= 1;
-	card->dai_link->codecs		= &compnent[1];
+	card->dai_link->codecs		= &asoc_dummy_dlc;
 	card->dai_link->num_codecs	= 1;
 
 	card->dai_link->name = card->name;
 	card->dai_link->stream_name = card->name;
 	card->dai_link->cpus->dai_name = dev_name(ad->dssdev);
-	card->dai_link->codecs->name = "snd-soc-dummy";
-	card->dai_link->codecs->dai_name = "snd-soc-dummy-dai";
 	card->num_links = 1;
 	card->dev = dev;