ASoC: dwc: support dw i2s in slave mode

dw i2s controller can work in slave mode, codec being master.
dw i2s is made to support master/slave operation, by reading dwc
register.
Signed-off-by: Maruthi Bayyavarapu <maruthi.bayyavarapu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

include/sound/designware_i2s.h

@@ -38,6 +38,8 @@ struct i2s_clk_config_data {
 struct i2s_platform_data {
 	#define DWC_I2S_PLAY	(1 << 0)
 	#define DWC_I2S_RECORD	(1 << 1)
+	#define DW_I2S_SLAVE	(1 << 2)
+	#define DW_I2S_MASTER	(1 << 3)
 	unsigned int cap;
 	int channel;
 	u32 snd_fmts;

sound/soc/dwc/designware_i2s.c

@@ -273,6 +273,7 @@ static int dw_i2s_hw_params(struct snd_pcm_substream *substream,
 
 	config->sample_rate = params_rate(params);
 
+	if (dev->capability & DW_I2S_MASTER) {
 		if (dev->i2s_clk_cfg) {
 			ret = dev->i2s_clk_cfg(config);
 			if (ret < 0) {
@@ -280,7 +281,8 @@ static int dw_i2s_hw_params(struct snd_pcm_substream *substream,
 				return ret;
 			}
 		} else {
-		u32 bitclk = config->sample_rate * config->data_width * 2;
+			u32 bitclk = config->sample_rate *
+					config->data_width * 2;
 
 			ret = clk_set_rate(dev->clk, bitclk);
 			if (ret) {
@@ -289,7 +291,7 @@ static int dw_i2s_hw_params(struct snd_pcm_substream *substream,
 				return ret;
 			}
 		}
-
+	}
 	return 0;
 }
 
@@ -357,6 +359,7 @@ static int dw_i2s_suspend(struct snd_soc_dai *dai)
 {
 	struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
 
+	if (dev->capability & DW_I2S_MASTER)
 		clk_disable(dev->clk);
 	return 0;
 }
@@ -365,6 +368,7 @@ static int dw_i2s_resume(struct snd_soc_dai *dai)
 {
 	struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
 
+	if (dev->capability & DW_I2S_MASTER)
 		clk_enable(dev->clk);
 	return 0;
 }
@@ -443,6 +447,14 @@ static int dw_configure_dai(struct dw_i2s_dev *dev,
 		dw_i2s_dai->capture.rates = rates;
 	}
 
+	if (COMP1_MODE_EN(comp1)) {
+		dev_dbg(dev->dev, "designware: i2s master mode supported\n");
+		dev->capability |= DW_I2S_MASTER;
+	} else {
+		dev_dbg(dev->dev, "designware: i2s slave mode supported\n");
+		dev->capability |= DW_I2S_SLAVE;
+	}
+
 	return 0;
 }
 
@@ -529,6 +541,7 @@ static int dw_i2s_probe(struct platform_device *pdev)
 	struct resource *res;
 	int ret;
 	struct snd_soc_dai_driver *dw_i2s_dai;
+	const char *clk_id;
 
 	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
 	if (!dev) {
@@ -550,32 +563,35 @@ static int dw_i2s_probe(struct platform_device *pdev)
 		return PTR_ERR(dev->i2s_base);
 
 	dev->dev = &pdev->dev;
+
 	if (pdata) {
+		dev->capability = pdata->cap;
+		clk_id = NULL;
 		ret = dw_configure_dai_by_pd(dev, dw_i2s_dai, res, pdata);
+	} else {
+		clk_id = "i2sclk";
+		ret = dw_configure_dai_by_dt(dev, dw_i2s_dai, res);
+	}
 	if (ret < 0)
 		return ret;
 
-		dev->capability = pdata->cap;
+	if (dev->capability & DW_I2S_MASTER) {
+		if (pdata) {
 			dev->i2s_clk_cfg = pdata->i2s_clk_cfg;
 			if (!dev->i2s_clk_cfg) {
 				dev_err(&pdev->dev, "no clock configure method\n");
 				return -ENODEV;
 			}
-
-		dev->clk = devm_clk_get(&pdev->dev, NULL);
-	} else {
-		ret = dw_configure_dai_by_dt(dev, dw_i2s_dai, res);
-		if (ret < 0)
-			return ret;
-
-		dev->clk = devm_clk_get(&pdev->dev, "i2sclk");
 		}
+		dev->clk = devm_clk_get(&pdev->dev, clk_id);
+
 		if (IS_ERR(dev->clk))
 			return PTR_ERR(dev->clk);
 
 		ret = clk_prepare_enable(dev->clk);
 		if (ret < 0)
 			return ret;
+	}
 
 	dev_set_drvdata(&pdev->dev, dev);
 	ret = devm_snd_soc_register_component(&pdev->dev, &dw_i2s_component,
@@ -597,6 +613,7 @@ static int dw_i2s_probe(struct platform_device *pdev)
 	return 0;
 
 err_clk_disable:
+	if (dev->capability & DW_I2S_MASTER)
 		clk_disable_unprepare(dev->clk);
 	return ret;
 }
@@ -605,6 +622,7 @@ static int dw_i2s_remove(struct platform_device *pdev)
 {
 	struct dw_i2s_dev *dev = dev_get_drvdata(&pdev->dev);
 
+	if (dev->capability & DW_I2S_MASTER)
 		clk_disable_unprepare(dev->clk);
 
 	return 0;