ASoc: amd: Add DMIC switch capability to machine driver

Switch between DMIC0 and DMIC1 based on recording device selected.
This is done by toggling the dmic select gpio.
Signed-off-by: NAkshu Agrawal <akshu.agrawal@amd.com>
Link: https://lore.kernel.org/r/20200302082443.51587-1-akshu.agrawal@amd.comSigned-off-by: NMark Brown <broonie@kernel.org>

sound/soc/amd/acp3x-rt5682-max9836.c

@@ -12,6 +12,7 @@
 #include <sound/jack.h>
 #include <linux/clk.h>
 #include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/module.h>
 #include <linux/i2c.h>
 #include <linux/input.h>
@@ -27,6 +28,7 @@
 static struct snd_soc_jack pco_jack;
 static struct clk *rt5682_dai_wclk;
 static struct clk *rt5682_dai_bclk;
+static struct gpio_desc *dmic_sel;
 
 static int acp3x_5682_init(struct snd_soc_pcm_runtime *rtd)
 {
@@ -176,7 +178,7 @@ static int acp3x_max_startup(struct snd_pcm_substream *substream)
 	return rt5682_clk_enable(substream);
 }
 
-static int acp3x_ec_startup(struct snd_pcm_substream *substream)
+static int acp3x_ec_dmic0_startup(struct snd_pcm_substream *substream)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct snd_soc_card *card = rtd->card;
@@ -185,6 +187,23 @@ static int acp3x_ec_startup(struct snd_pcm_substream *substream)
 
 	machine->cap_i2s_instance = I2S_BT_INSTANCE;
 	snd_soc_dai_set_bclk_ratio(codec_dai, 64);
+	if (dmic_sel)
+		gpiod_set_value(dmic_sel, 0);
+
+	return rt5682_clk_enable(substream);
+}
+
+static int acp3x_ec_dmic1_startup(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_card *card = rtd->card;
+	struct snd_soc_dai *codec_dai = rtd->codec_dai;
+	struct acp3x_platform_info *machine = snd_soc_card_get_drvdata(card);
+
+	machine->cap_i2s_instance = I2S_BT_INSTANCE;
+	snd_soc_dai_set_bclk_ratio(codec_dai, 64);
+	if (dmic_sel)
+		gpiod_set_value(dmic_sel, 1);
 
 	return rt5682_clk_enable(substream);
 }
@@ -204,8 +223,13 @@ static const struct snd_soc_ops acp3x_max_play_ops = {
 	.shutdown = rt5682_shutdown,
 };
 
-static const struct snd_soc_ops acp3x_ec_cap_ops = {
-	.startup = acp3x_ec_startup,
+static const struct snd_soc_ops acp3x_ec_cap0_ops = {
+	.startup = acp3x_ec_dmic0_startup,
+	.shutdown = rt5682_shutdown,
+};
+
+static const struct snd_soc_ops acp3x_ec_cap1_ops = {
+	.startup = acp3x_ec_dmic1_startup,
 	.shutdown = rt5682_shutdown,
 };
 
@@ -246,12 +270,21 @@ static struct snd_soc_dai_link acp3x_dai_5682_98357[] = {
 		SND_SOC_DAILINK_REG(acp3x_bt, max, platform),
 	},
 	{
-		.name = "acp3x-ec-capture",
-		.stream_name = "Capture",
+		.name = "acp3x-ec-dmic0-capture",
+		.stream_name = "Capture DMIC0",
+		.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF
+				| SND_SOC_DAIFMT_CBS_CFS,
+		.dpcm_capture = 1,
+		.ops = &acp3x_ec_cap0_ops,
+		SND_SOC_DAILINK_REG(acp3x_bt, cros_ec, platform),
+	},
+	{
+		.name = "acp3x-ec-dmic1-capture",
+		.stream_name = "Capture DMIC1",
 		.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF
 				| SND_SOC_DAIFMT_CBS_CFS,
 		.dpcm_capture = 1,
-		.ops = &acp3x_ec_cap_ops,
+		.ops = &acp3x_ec_cap1_ops,
 		SND_SOC_DAILINK_REG(acp3x_bt, cros_ec, platform),
 	},
 };
@@ -302,6 +335,14 @@ static int acp3x_probe(struct platform_device *pdev)
 	acp3x_card.dev = &pdev->dev;
 	platform_set_drvdata(pdev, card);
 	snd_soc_card_set_drvdata(card, machine);
+
+	dmic_sel = devm_gpiod_get(&pdev->dev, "dmic", GPIOD_OUT_LOW);
+	if (IS_ERR(dmic_sel)) {
+		dev_err(&pdev->dev, "DMIC gpio failed err=%d\n",
+			PTR_ERR(dmic_sel));
+		return PTR_ERR(dmic_sel);
+	}
+
 	ret = devm_snd_soc_register_card(&pdev->dev, &acp3x_card);
 	if (ret) {
 		dev_err(&pdev->dev,