[PATCH v2 0/6] ASoC: dwc: Add device tree support to designware I2S

[PATCH v2 0/6] ASoC: dwc: Add device tree support to designware I2S

[Andrew Jackson]

From: Andrew Jackson <Andrew.Jackson@arm.com>

This patch set extends the DesignWare I2S driver to provide device
tree support and fixes a couple of small faults.

Changes v1->v2
  + Drop negative use count patch [Mark Brown]
  + Remove unnecessary debug print messages [Lars-Peter Clausen]
  + Rewrite iteration as for loop rather than do...while [Mark Brown]
  + Reorder patches to send fixes first [Mark Brown]
  + Simplify device tree code [Mark Brown]
  + Split device tree patch in two [Mark Brown]
  + Expand explanatory comment on channel configuration [Rajeev Kumar]

Arnd: I've not forgotten about updating the spear entries

Andrew Jackson (6):
  ASoC: dwc: Remove unnecessary debug messages and tests
  ASoC: dwc: Ensure FIFOs are flushed to prevent channel swap
  ASoC: dwc: Iterate over all channels
  ASoC: dwc: Reorder code in preparation for DT support
  ASoC: dwc: Add devicetree support for Designware I2S
  ASoC: dwc: Add documentation for I2S DT

 .../devicetree/bindings/sound/designware-i2s.txt   |   32 +++
 sound/soc/dwc/Kconfig                              |    1 +
 sound/soc/dwc/designware_i2s.c                     |  294 ++++++++++++++------
 3 files changed, 248 insertions(+), 79 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/sound/designware-i2s.txt

[PATCH v2 1/6] ASoC: dwc: Remove unnecessary debug messages and tests

[Andrew Jackson]

From: Andrew Jackson <Andrew.Jackson@arm.com>

The devm_XXX allocation functions print a message on failure,
so additional messages are not required.

Signed-off-by: Andrew Jackson <Andrew.Jackson@arm.com>
---
 sound/soc/dwc/designware_i2s.c |   13 ++-----------
 1 files changed, 2 insertions(+), 11 deletions(-)

diff --git a/sound/soc/dwc/designware_i2s.c b/sound/soc/dwc/designware_i2s.c
index d202c7c..ef771ea 100644
--- a/sound/soc/dwc/designware_i2s.c
+++ b/sound/soc/dwc/designware_i2s.c
@@ -345,26 +345,17 @@ static int dw_i2s_probe(struct platform_device *pdev)
 	}
 
 	dw_i2s_dai = devm_kzalloc(&pdev->dev, sizeof(*dw_i2s_dai), GFP_KERNEL);
-	if (!dw_i2s_dai) {
-		dev_err(&pdev->dev, "mem allocation failed for dai driver\n");
+	if (!dw_i2s_dai)
 		return -ENOMEM;
-	}
 
 	dw_i2s_dai->ops = &dw_i2s_dai_ops;
 	dw_i2s_dai->suspend = dw_i2s_suspend;
 	dw_i2s_dai->resume = dw_i2s_resume;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		dev_err(&pdev->dev, "no i2s resource defined\n");
-		return -ENODEV;
-	}
-
 	dev->i2s_base = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(dev->i2s_base)) {
-		dev_err(&pdev->dev, "ioremap fail for i2s_region\n");
+	if (IS_ERR(dev->i2s_base))
 		return PTR_ERR(dev->i2s_base);
-	}
 
 	cap = pdata->cap;
 	dev->capability = cap;
-- 
1.7.1

[PATCH v2 2/6] ASoC: dwc: Ensure FIFOs are flushed to prevent channel swap

[Andrew Jackson]

From: Andrew Jackson <Andrew.Jackson@arm.com>

If the FIFOs aren't flushed, the left/right channels may be swapped:
this may occur if the FIFOs are not empty when the streams start.

Signed-off-by: Andrew Jackson <Andrew.Jackson@arm.com>
---
 sound/soc/dwc/designware_i2s.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/sound/soc/dwc/designware_i2s.c b/sound/soc/dwc/designware_i2s.c
index ef771ea..b9d6a25 100644
--- a/sound/soc/dwc/designware_i2s.c
+++ b/sound/soc/dwc/designware_i2s.c
@@ -228,12 +228,14 @@ static int dw_i2s_hw_params(struct snd_pcm_substream *substream,
 	i2s_disable_channels(dev, substream->stream);
 
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+		i2s_write_reg(dev->i2s_base, TXFFR, 1);
 		i2s_write_reg(dev->i2s_base, TCR(ch_reg), xfer_resolution);
 		i2s_write_reg(dev->i2s_base, TFCR(ch_reg), 0x02);
 		irq = i2s_read_reg(dev->i2s_base, IMR(ch_reg));
 		i2s_write_reg(dev->i2s_base, IMR(ch_reg), irq & ~0x30);
 		i2s_write_reg(dev->i2s_base, TER(ch_reg), 1);
 	} else {
+		i2s_write_reg(dev->i2s_base, RXFFR, 1);
 		i2s_write_reg(dev->i2s_base, RCR(ch_reg), xfer_resolution);
 		i2s_write_reg(dev->i2s_base, RFCR(ch_reg), 0x07);
 		irq = i2s_read_reg(dev->i2s_base, IMR(ch_reg));
-- 
1.7.1

[PATCH v2 3/6] ASoC: dwc: Iterate over all channels

[Andrew Jackson]

From: Andrew Jackson <Andrew.Jackson@arm.com>

The Designware core can be configured with up to four stereo channels.
Each stereo channel is individually configured so, when the driver's
hw_params call is made, each requested stereo channel has to be
programmed.

Signed-off-by: Andrew Jackson <Andrew.Jackson@arm.com>
---
 sound/soc/dwc/designware_i2s.c |   39 ++++++++++++++++++---------------------
 1 files changed, 18 insertions(+), 21 deletions(-)

diff --git a/sound/soc/dwc/designware_i2s.c b/sound/soc/dwc/designware_i2s.c
index b9d6a25..1d26ded 100644
--- a/sound/soc/dwc/designware_i2s.c
+++ b/sound/soc/dwc/designware_i2s.c
@@ -209,16 +209,9 @@ static int dw_i2s_hw_params(struct snd_pcm_substream *substream,
 
 	switch (config->chan_nr) {
 	case EIGHT_CHANNEL_SUPPORT:
-		ch_reg = 3;
-		break;
 	case SIX_CHANNEL_SUPPORT:
-		ch_reg = 2;
-		break;
 	case FOUR_CHANNEL_SUPPORT:
-		ch_reg = 1;
-		break;
 	case TWO_CHANNEL_SUPPORT:
-		ch_reg = 0;
 		break;
 	default:
 		dev_err(dev->dev, "channel not supported\n");
@@ -227,20 +220,24 @@ static int dw_i2s_hw_params(struct snd_pcm_substream *substream,
 
 	i2s_disable_channels(dev, substream->stream);
 
-	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
-		i2s_write_reg(dev->i2s_base, TXFFR, 1);
-		i2s_write_reg(dev->i2s_base, TCR(ch_reg), xfer_resolution);
-		i2s_write_reg(dev->i2s_base, TFCR(ch_reg), 0x02);
-		irq = i2s_read_reg(dev->i2s_base, IMR(ch_reg));
-		i2s_write_reg(dev->i2s_base, IMR(ch_reg), irq & ~0x30);
-		i2s_write_reg(dev->i2s_base, TER(ch_reg), 1);
-	} else {
-		i2s_write_reg(dev->i2s_base, RXFFR, 1);
-		i2s_write_reg(dev->i2s_base, RCR(ch_reg), xfer_resolution);
-		i2s_write_reg(dev->i2s_base, RFCR(ch_reg), 0x07);
-		irq = i2s_read_reg(dev->i2s_base, IMR(ch_reg));
-		i2s_write_reg(dev->i2s_base, IMR(ch_reg), irq & ~0x03);
-		i2s_write_reg(dev->i2s_base, RER(ch_reg), 1);
+	for (ch_reg = 0; ch_reg < (config->chan_nr / 2); ch_reg++) {
+		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+			i2s_write_reg(dev->i2s_base, TXFFR, 1);
+			i2s_write_reg(dev->i2s_base, TCR(ch_reg),
+				      xfer_resolution);
+			i2s_write_reg(dev->i2s_base, TFCR(ch_reg), 0x02);
+			irq = i2s_read_reg(dev->i2s_base, IMR(ch_reg));
+			i2s_write_reg(dev->i2s_base, IMR(ch_reg), irq & ~0x30);
+			i2s_write_reg(dev->i2s_base, TER(ch_reg), 1);
+		} else {
+			i2s_write_reg(dev->i2s_base, RXFFR, 1);
+			i2s_write_reg(dev->i2s_base, RCR(ch_reg),
+				      xfer_resolution);
+			i2s_write_reg(dev->i2s_base, RFCR(ch_reg), 0x07);
+			irq = i2s_read_reg(dev->i2s_base, IMR(ch_reg));
+			i2s_write_reg(dev->i2s_base, IMR(ch_reg), irq & ~0x03);
+			i2s_write_reg(dev->i2s_base, RER(ch_reg), 1);
+		}
 	}
 
 	i2s_write_reg(dev->i2s_base, CCR, ccr);
-- 
1.7.1

[PATCH v2 4/6] ASoC: dwc: Reorder code in preparation for DT support

[Andrew Jackson]

From: Andrew Jackson <Andrew.Jackson@arm.com>

Move code that configures the DAI and DMA into a separate function.  This
reduces the size of the dw_i2s_probe function and will make it easier to
add support for device tree to the driver.

Signed-off-by: Andrew Jackson <Andrew.Jackson@arm.com>
---
 sound/soc/dwc/designware_i2s.c |   73 +++++++++++++++++++++------------------
 1 files changed, 39 insertions(+), 34 deletions(-)

diff --git a/sound/soc/dwc/designware_i2s.c b/sound/soc/dwc/designware_i2s.c
index 1d26ded..343f5e7 100644
--- a/sound/soc/dwc/designware_i2s.c
+++ b/sound/soc/dwc/designware_i2s.c
@@ -323,13 +323,47 @@ static int dw_i2s_resume(struct snd_soc_dai *dai)
 #define dw_i2s_resume	NULL
 #endif
 
+static void dw_configure_dai_by_pd(struct dw_i2s_dev *dev,
+				   struct snd_soc_dai_driver *dw_i2s_dai,
+				   struct resource *res,
+				   const struct i2s_platform_data *pdata)
+{
+	/* Set DMA slaves info */
+
+	dev->play_dma_data.data = pdata->play_dma_data;
+	dev->capture_dma_data.data = pdata->capture_dma_data;
+	dev->play_dma_data.addr = res->start + I2S_TXDMA;
+	dev->capture_dma_data.addr = res->start + I2S_RXDMA;
+	dev->play_dma_data.max_burst = 16;
+	dev->capture_dma_data.max_burst = 16;
+	dev->play_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
+	dev->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
+	dev->play_dma_data.filter = pdata->filter;
+	dev->capture_dma_data.filter = pdata->filter;
+
+	if (pdata->cap & DWC_I2S_PLAY) {
+		dev_dbg(dev->dev, " designware: play supported\n");
+		dw_i2s_dai->playback.channels_min = MIN_CHANNEL_NUM;
+		dw_i2s_dai->playback.channels_max = pdata->channel;
+		dw_i2s_dai->playback.formats = pdata->snd_fmts;
+		dw_i2s_dai->playback.rates = pdata->snd_rates;
+	}
+
+	if (pdata->cap & DWC_I2S_RECORD) {
+		dev_dbg(dev->dev, "designware: record supported\n");
+		dw_i2s_dai->capture.channels_min = MIN_CHANNEL_NUM;
+		dw_i2s_dai->capture.channels_max = pdata->channel;
+		dw_i2s_dai->capture.formats = pdata->snd_fmts;
+		dw_i2s_dai->capture.rates = pdata->snd_rates;
+	}
+}
+
 static int dw_i2s_probe(struct platform_device *pdev)
 {
 	const struct i2s_platform_data *pdata = pdev->dev.platform_data;
 	struct dw_i2s_dev *dev;
 	struct resource *res;
 	int ret;
-	unsigned int cap;
 	struct snd_soc_dai_driver *dw_i2s_dai;
 
 	if (!pdata) {
@@ -356,23 +390,11 @@ static int dw_i2s_probe(struct platform_device *pdev)
 	if (IS_ERR(dev->i2s_base))
 		return PTR_ERR(dev->i2s_base);
 
-	cap = pdata->cap;
-	dev->capability = cap;
-	dev->i2s_clk_cfg = pdata->i2s_clk_cfg;
-
-	/* Set DMA slaves info */
-
-	dev->play_dma_data.data = pdata->play_dma_data;
-	dev->capture_dma_data.data = pdata->capture_dma_data;
-	dev->play_dma_data.addr = res->start + I2S_TXDMA;
-	dev->capture_dma_data.addr = res->start + I2S_RXDMA;
-	dev->play_dma_data.max_burst = 16;
-	dev->capture_dma_data.max_burst = 16;
-	dev->play_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
-	dev->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
-	dev->play_dma_data.filter = pdata->filter;
-	dev->capture_dma_data.filter = pdata->filter;
+	dev->dev = &pdev->dev;
+	dw_configure_dai_by_pd(dev, dw_i2s_dai, res, pdata);
 
+	dev->capability = pdata->cap;
+	dev->i2s_clk_cfg = pdata->i2s_clk_cfg;
 	dev->clk = clk_get(&pdev->dev, NULL);
 	if (IS_ERR(dev->clk))
 		return  PTR_ERR(dev->clk);
@@ -381,23 +403,6 @@ static int dw_i2s_probe(struct platform_device *pdev)
 	if (ret < 0)
 		goto err_clk_put;
 
-	if (cap & DWC_I2S_PLAY) {
-		dev_dbg(&pdev->dev, " designware: play supported\n");
-		dw_i2s_dai->playback.channels_min = MIN_CHANNEL_NUM;
-		dw_i2s_dai->playback.channels_max = pdata->channel;
-		dw_i2s_dai->playback.formats = pdata->snd_fmts;
-		dw_i2s_dai->playback.rates = pdata->snd_rates;
-	}
-
-	if (cap & DWC_I2S_RECORD) {
-		dev_dbg(&pdev->dev, "designware: record supported\n");
-		dw_i2s_dai->capture.channels_min = MIN_CHANNEL_NUM;
-		dw_i2s_dai->capture.channels_max = pdata->channel;
-		dw_i2s_dai->capture.formats = pdata->snd_fmts;
-		dw_i2s_dai->capture.rates = pdata->snd_rates;
-	}
-
-	dev->dev = &pdev->dev;
 	dev_set_drvdata(&pdev->dev, dev);
 	ret = snd_soc_register_component(&pdev->dev, &dw_i2s_component,
 					 dw_i2s_dai, 1);
-- 
1.7.1

[PATCH v2 5/6] ASoC: dwc: Add devicetree support for Designware I2S

[Andrew Jackson]

From: Andrew Jackson <Andrew.Jackson@arm.com>

Allow the driver to be configured through a device tree rather than platform
data.  When using device-tree, read the I2S block's configuration from the
relevant registers: this reduces the amount of information required in
the device tree.

Signed-off-by: Andrew Jackson <Andrew.Jackson@arm.com>
---
 sound/soc/dwc/Kconfig          |    1 +
 sound/soc/dwc/designware_i2s.c |  199 ++++++++++++++++++++++++++++++++++------
 2 files changed, 171 insertions(+), 29 deletions(-)

diff --git a/sound/soc/dwc/Kconfig b/sound/soc/dwc/Kconfig
index e334900..d50e085 100644
--- a/sound/soc/dwc/Kconfig
+++ b/sound/soc/dwc/Kconfig
@@ -1,6 +1,7 @@
 config SND_DESIGNWARE_I2S
 	tristate "Synopsys I2S Device Driver"
 	depends on CLKDEV_LOOKUP
+	select SND_SOC_GENERIC_DMAENGINE_PCM
 	help
 	 Say Y or M if you want to add support for I2S driver for
 	 Synopsys desigwnware I2S device. The device supports upto
diff --git a/sound/soc/dwc/designware_i2s.c b/sound/soc/dwc/designware_i2s.c
index 343f5e7..9e1f547 100644
--- a/sound/soc/dwc/designware_i2s.c
+++ b/sound/soc/dwc/designware_i2s.c
@@ -22,6 +22,7 @@
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
+#include <sound/dmaengine_pcm.h>
 
 /* common register for all channel */
 #define IER		0x000
@@ -54,9 +55,35 @@
 #define I2S_COMP_VERSION	0x01F8
 #define I2S_COMP_TYPE		0x01FC
 
+/*
+ * Component parameter register fields - define the I2S block's
+ * configuration.
+ */
+#define	COMP1_TX_WORDSIZE_3(r)	(((r) & GENMASK(27, 25)) >> 25)
+#define	COMP1_TX_WORDSIZE_2(r)	(((r) & GENMASK(24, 22)) >> 22)
+#define	COMP1_TX_WORDSIZE_1(r)	(((r) & GENMASK(21, 19)) >> 19)
+#define	COMP1_TX_WORDSIZE_0(r)	(((r) & GENMASK(18, 16)) >> 16)
+#define	COMP1_TX_CHANNELS(r)	(((r) & GENMASK(10, 9)) >> 9)
+#define	COMP1_RX_CHANNELS(r)	(((r) & GENMASK(8, 7)) >> 7)
+#define	COMP1_RX_ENABLED(r)	(((r) & BIT(6)) >> 6)
+#define	COMP1_TX_ENABLED(r)	(((r) & BIT(5)) >> 5)
+#define	COMP1_MODE_EN(r)	(((r) & BIT(4)) >> 4)
+#define	COMP1_FIFO_DEPTH_GLOBAL(r)	(((r) & GENMASK(3, 2)) >> 2)
+#define	COMP1_APB_DATA_WIDTH(r)	(((r) & GENMASK(1, 0)) >> 0)
+
+#define	COMP2_RX_WORDSIZE_3(r)	(((r) & GENMASK(12, 10)) >> 10)
+#define	COMP2_RX_WORDSIZE_2(r)	(((r) & GENMASK(9, 7)) >> 7)
+#define	COMP2_RX_WORDSIZE_1(r)	(((r) & GENMASK(5, 3)) >> 3)
+#define	COMP2_RX_WORDSIZE_0(r)	(((r) & GENMASK(2, 0)) >> 0)
+
 #define MAX_CHANNEL_NUM		8
 #define MIN_CHANNEL_NUM		2
 
+union snd_dma_data {
+	struct i2s_dma_data pd;
+	struct snd_dmaengine_dai_dma_data dt;
+};
+
 struct dw_i2s_dev {
 	void __iomem *i2s_base;
 	struct clk *clk;
@@ -65,8 +92,8 @@ struct dw_i2s_dev {
 	struct device *dev;
 
 	/* data related to DMA transfers b/w i2s and DMAC */
-	struct i2s_dma_data play_dma_data;
-	struct i2s_dma_data capture_dma_data;
+	union snd_dma_data play_dma_data;
+	union snd_dma_data capture_dma_data;
 	struct i2s_clk_config_data config;
 	int (*i2s_clk_cfg)(struct i2s_clk_config_data *config);
 };
@@ -153,7 +180,7 @@ static int dw_i2s_startup(struct snd_pcm_substream *substream,
 		struct snd_soc_dai *cpu_dai)
 {
 	struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(cpu_dai);
-	struct i2s_dma_data *dma_data = NULL;
+	union snd_dma_data *dma_data = NULL;
 
 	if (!(dev->capability & DWC_I2S_RECORD) &&
 			(substream->stream == SNDRV_PCM_STREAM_CAPTURE))
@@ -244,13 +271,18 @@ static int dw_i2s_hw_params(struct snd_pcm_substream *substream,
 
 	config->sample_rate = params_rate(params);
 
-	if (!dev->i2s_clk_cfg)
-		return -EINVAL;
+	if (dev->i2s_clk_cfg) {
+		ret = dev->i2s_clk_cfg(config);
+		if (ret < 0) {
+			dev_err(dev->dev, "runtime audio clk config fail\n");
+			return ret;
+		}
+	} else {
+		u32	bitclk;
 
-	ret = dev->i2s_clk_cfg(config);
-	if (ret < 0) {
-		dev_err(dev->dev, "runtime audio clk config fail\n");
-		return ret;
+		/* TODO: Validate sample rate against permissible set */
+		bitclk = config->sample_rate * config->data_width * 2;
+		clk_set_rate(dev->clk, bitclk);
 	}
 
 	return 0;
@@ -323,6 +355,31 @@ static int dw_i2s_resume(struct snd_soc_dai *dai)
 #define dw_i2s_resume	NULL
 #endif
 
+/* Maximum resolution of a channel - not uniformly spaced */
+static const u32 fifo_width[] = {
+	12, 16, 20, 24, 32, 0, 0, 0
+};
+
+/* Width of (DMA) bus */
+static const u32 bus_widths[] = {
+	DMA_SLAVE_BUSWIDTH_1_BYTE,
+	DMA_SLAVE_BUSWIDTH_2_BYTES,
+	DMA_SLAVE_BUSWIDTH_4_BYTES,
+	DMA_SLAVE_BUSWIDTH_UNDEFINED
+};
+
+/* PCM format to support channel resolution */
+static const u32 formats[] = {
+	SNDRV_PCM_FMTBIT_S16_LE,
+	SNDRV_PCM_FMTBIT_S16_LE,
+	SNDRV_PCM_FMTBIT_S24_LE,
+	SNDRV_PCM_FMTBIT_S24_LE,
+	SNDRV_PCM_FMTBIT_S32_LE,
+	0,
+	0,
+	0
+};
+
 static void dw_configure_dai_by_pd(struct dw_i2s_dev *dev,
 				   struct snd_soc_dai_driver *dw_i2s_dai,
 				   struct resource *res,
@@ -330,16 +387,16 @@ static void dw_configure_dai_by_pd(struct dw_i2s_dev *dev,
 {
 	/* Set DMA slaves info */
 
-	dev->play_dma_data.data = pdata->play_dma_data;
-	dev->capture_dma_data.data = pdata->capture_dma_data;
-	dev->play_dma_data.addr = res->start + I2S_TXDMA;
-	dev->capture_dma_data.addr = res->start + I2S_RXDMA;
-	dev->play_dma_data.max_burst = 16;
-	dev->capture_dma_data.max_burst = 16;
-	dev->play_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
-	dev->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
-	dev->play_dma_data.filter = pdata->filter;
-	dev->capture_dma_data.filter = pdata->filter;
+	dev->play_dma_data.pd.data = pdata->play_dma_data;
+	dev->capture_dma_data.pd.data = pdata->capture_dma_data;
+	dev->play_dma_data.pd.addr = res->start + I2S_TXDMA;
+	dev->capture_dma_data.pd.addr = res->start + I2S_RXDMA;
+	dev->play_dma_data.pd.max_burst = 16;
+	dev->capture_dma_data.pd.max_burst = 16;
+	dev->play_dma_data.pd.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
+	dev->capture_dma_data.pd.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
+	dev->play_dma_data.pd.filter = pdata->filter;
+	dev->capture_dma_data.pd.filter = pdata->filter;
 
 	if (pdata->cap & DWC_I2S_PLAY) {
 		dev_dbg(dev->dev, " designware: play supported\n");
@@ -358,6 +415,59 @@ static void dw_configure_dai_by_pd(struct dw_i2s_dev *dev,
 	}
 }
 
+static void dw_configure_dai_by_dt(struct dw_i2s_dev *dev,
+				   struct snd_soc_dai_driver *dw_i2s_dai,
+				   struct resource *res)
+{
+	/*
+	 * Read component parameter registers to extract
+	 * the I2S block's configuration.
+	 */
+	u32 comp1 = i2s_read_reg(dev->i2s_base, I2S_COMP_PARAM_1);
+	u32 comp2 = i2s_read_reg(dev->i2s_base, I2S_COMP_PARAM_2);
+	u32 bus_width = bus_widths[COMP1_APB_DATA_WIDTH(comp1)];
+	u32 fifo_depth = 1 << (1 + COMP1_FIFO_DEPTH_GLOBAL(comp1));
+	u32 max_size;
+
+	/*
+	 * All channels' hardware configuration assumed to be the same.
+	 */
+	if (COMP1_TX_ENABLED(comp1)) {
+		dev_dbg(dev->dev, "playback capable\n");
+
+		dev->capability |= DWC_I2S_PLAY;
+		max_size = COMP1_TX_WORDSIZE_0(comp1);
+		dev->play_dma_data.dt.addr = res->start + I2S_TXDMA;
+		dev->play_dma_data.dt.addr_width = bus_width;
+		dev->play_dma_data.dt.chan_name = "TX";
+		dev->play_dma_data.dt.fifo_size = fifo_depth *
+			(fifo_width[max_size]) >> 8;
+		dev->play_dma_data.dt.maxburst = 16;
+		dw_i2s_dai->playback.channels_min = MIN_CHANNEL_NUM;
+		dw_i2s_dai->playback.channels_max =
+				1 << (COMP1_TX_CHANNELS(comp1) + 1);
+		dw_i2s_dai->playback.formats = formats[max_size];
+		dw_i2s_dai->playback.rates = SNDRV_PCM_RATE_8000_192000;
+	}
+	if (COMP1_RX_ENABLED(comp1)) {
+		dev_dbg(dev->dev, "record capable\n");
+
+		dev->capability |= DWC_I2S_RECORD;
+		max_size = COMP2_RX_WORDSIZE_0(comp2);
+		dev->capture_dma_data.dt.addr = res->start + I2S_RXDMA;
+		dev->capture_dma_data.dt.addr_width = bus_width;
+		dev->capture_dma_data.dt.chan_name = "RX";
+		dev->capture_dma_data.dt.fifo_size = fifo_depth *
+			(fifo_width[max_size] >> 8);
+		dev->capture_dma_data.dt.maxburst = 16;
+		dw_i2s_dai->capture.channels_min = MIN_CHANNEL_NUM;
+		dw_i2s_dai->capture.channels_max =
+				1 << (COMP1_RX_CHANNELS(comp1) + 1);
+		dw_i2s_dai->capture.formats = formats[max_size];
+		dw_i2s_dai->capture.rates = SNDRV_PCM_RATE_8000_192000;
+	}
+}
+
 static int dw_i2s_probe(struct platform_device *pdev)
 {
 	const struct i2s_platform_data *pdata = pdev->dev.platform_data;
@@ -366,11 +476,6 @@ static int dw_i2s_probe(struct platform_device *pdev)
 	int ret;
 	struct snd_soc_dai_driver *dw_i2s_dai;
 
-	if (!pdata) {
-		dev_err(&pdev->dev, "Invalid platform data\n");
-		return -EINVAL;
-	}
-
 	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
 	if (!dev) {
 		dev_warn(&pdev->dev, "kzalloc fail\n");
@@ -391,13 +496,28 @@ static int dw_i2s_probe(struct platform_device *pdev)
 		return PTR_ERR(dev->i2s_base);
 
 	dev->dev = &pdev->dev;
-	dw_configure_dai_by_pd(dev, dw_i2s_dai, res, pdata);
+	if (pdata) {
+		dw_configure_dai_by_pd(dev, dw_i2s_dai, res, pdata);
+
+		dev->capability = pdata->cap;
+		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->capability = pdata->cap;
-	dev->i2s_clk_cfg = pdata->i2s_clk_cfg;
-	dev->clk = clk_get(&pdev->dev, NULL);
+		dev->clk = clk_get(&pdev->dev, NULL);
+	} else {
+		dw_configure_dai_by_dt(dev, dw_i2s_dai, res);
+
+		dev->clk = devm_clk_get(&pdev->dev, "i2sclk");
+	}
 	if (IS_ERR(dev->clk))
-		return  PTR_ERR(dev->clk);
+		return PTR_ERR(dev->clk);
+
+	ret = clk_prepare(dev->clk);
+	if (ret < 0)
+		goto err_clk_put;
 
 	ret = clk_enable(dev->clk);
 	if (ret < 0)
@@ -411,6 +531,15 @@ static int dw_i2s_probe(struct platform_device *pdev)
 		goto err_clk_disable;
 	}
 
+	if (!pdata) {
+		ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
+		if (ret) {
+			dev_err(&pdev->dev,
+				"Could not register PCM: %d\n", ret);
+			return ret;
+		}
+	}
+
 	return 0;
 
 err_clk_disable:
@@ -431,12 +560,24 @@ static int dw_i2s_remove(struct platform_device *pdev)
 	return 0;
 }
 
+#ifdef CONFIG_OF
+static const struct of_device_id dw_i2s_of_match[] = {
+	{ .compatible = "snps,designware-i2s",	 },
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, dw_i2s_of_match);
+#endif
+
 static struct platform_driver dw_i2s_driver = {
 	.probe		= dw_i2s_probe,
 	.remove		= dw_i2s_remove,
 	.driver		= {
 		.name	= "designware-i2s",
 		.owner	= THIS_MODULE,
+#ifdef CONFIG_OF
+		.of_match_table = dw_i2s_of_match,
+#endif
 	},
 };
 
-- 
1.7.1

[PATCH v2 6/6] ASoC: dwc: Add documentation for I2S DT

[Andrew Jackson]

From: Andrew Jackson <Andrew.Jackson@arm.com>

Add documentation for Designware I2S hardware block.  The block requires
two clocks (one for audio sampling, the other for APB) and DMA channels
for receive and transmit.

Signed-off-by: Andrew Jackson <Andrew.Jackson@arm.com>
---
 .../devicetree/bindings/sound/designware-i2s.txt   |   32 ++++++++++++++++++++
 1 files changed, 32 insertions(+), 0 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/sound/designware-i2s.txt

diff --git a/Documentation/devicetree/bindings/sound/designware-i2s.txt b/Documentation/devicetree/bindings/sound/designware-i2s.txt
new file mode 100644
index 0000000..cdee591
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/designware-i2s.txt
@@ -0,0 +1,32 @@
+DesignWare I2S controller
+
+Required properties:
+ - compatible : Must be "snps,designware-i2s"
+ - reg : Must contain I2S core's registers location and length
+ - clocks : Pairs of phandle and specifier referencing the controller's clocks.
+   The controller expects two clocks, the clock used for the APB interface and
+   the clock used as the sampling rate reference clock sample.
+ - clock-names : "apb_plck" for the clock to the APB interface, "i2sclk" for the sample
+   rate reference clock.
+ - dmas: Pairs of phandle and specifier for the DMA channels that are used by
+   the core. The core expects one or two dma channels, one for transmit and one for
+   receive.
+ - dma-names : "tx" for the transmit channel, "rx" for the receive channel.
+
+For more details on the 'dma', 'dma-names', 'clock' and 'clock-names' properties
+please check:
+	* resource-names.txt
+	* clock/clock-bindings.txt
+	* dma/dma.txt
+
+Example:
+
+	soc_i2s: i2s at 7ff90000 {
+		compatible = "snps,designware-i2s";
+		reg = <0x0 0x7ff90000 0x0 0x1000>;
+		clocks = <&scpi_i2sclk 0>, <&soc_refclk100mhz>;
+		clock-names = "i2sclk", "apb_pclk";
+		#sound-dai-cells = <0>;
+		dmas = <&dma0 5>;
+		dma-names = "tx";
+	};
-- 
1.7.1

[PATCH v2 1/6] ASoC: dwc: Remove unnecessary debug messages and tests

[Joe Perches]

On Fri, 2014-12-12 at 09:25 +0000, Andrew Jackson wrote:
> The devm_XXX allocation functions print a message on failure,
> so additional messages are not required.
[]
> diff --git a/sound/soc/dwc/designware_i2s.c b/sound/soc/dwc/designware_i2s.c
[]
> @@ -345,26 +345,17 @@ static int dw_i2s_probe(struct platform_device *pdev)
>  	}
>  
>  	dw_i2s_dai = devm_kzalloc(&pdev->dev, sizeof(*dw_i2s_dai), GFP_KERNEL);
> -	if (!dw_i2s_dai) {
> -		dev_err(&pdev->dev, "mem allocation failed for dai driver\n");
> +	if (!dw_i2s_dai)
>  		return -ENOMEM;
> -	}

ok.
 
>  	dw_i2s_dai->ops = &dw_i2s_dai_ops;
>  	dw_i2s_dai->suspend = dw_i2s_suspend;
>  	dw_i2s_dai->resume = dw_i2s_resume;
>  
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -	if (!res) {
> -		dev_err(&pdev->dev, "no i2s resource defined\n");
> -		return -ENODEV;
> -	}
> -

Why delete this?

>  	dev->i2s_base = devm_ioremap_resource(&pdev->dev, res);
> -	if (IS_ERR(dev->i2s_base)) {
> -		dev_err(&pdev->dev, "ioremap fail for i2s_region\n");
> +	if (IS_ERR(dev->i2s_base))
>  		return PTR_ERR(dev->i2s_base);
> -	}

or this?

[PATCH v2 1/6] ASoC: dwc: Remove unnecessary debug messages and tests

[Lars-Peter Clausen]

On 12/12/2014 10:31 AM, Joe Perches wrote:
[...]
>>   	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> -	if (!res) {
>> -		dev_err(&pdev->dev, "no i2s resource defined\n");
>> -		return -ENODEV;
>> -	}
>> -
>
> Why delete this?
>
>>   	dev->i2s_base = devm_ioremap_resource(&pdev->dev, res);
>> -	if (IS_ERR(dev->i2s_base)) {
>> -		dev_err(&pdev->dev, "ioremap fail for i2s_region\n");
>> +	if (IS_ERR(dev->i2s_base))
>>   		return PTR_ERR(dev->i2s_base);
>> -	}
>
> or this?

devm_ioremap_resource both checks if res is NULL and does also its own error 
reporting. So the code in the driver is redundant.

[PATCH v2 2/6] ASoC: dwc: Ensure FIFOs are flushed to prevent channel swap

[Lars-Peter Clausen]

On 12/12/2014 10:25 AM, Andrew Jackson wrote:
> From: Andrew Jackson <Andrew.Jackson@arm.com>
>
> If the FIFOs aren't flushed, the left/right channels may be swapped:
> this may occur if the FIFOs are not empty when the streams start.
>
> Signed-off-by: Andrew Jackson <Andrew.Jackson@arm.com>
> ---
>   sound/soc/dwc/designware_i2s.c |    2 ++
>   1 files changed, 2 insertions(+), 0 deletions(-)
>
> diff --git a/sound/soc/dwc/designware_i2s.c b/sound/soc/dwc/designware_i2s.c
> index ef771ea..b9d6a25 100644
> --- a/sound/soc/dwc/designware_i2s.c
> +++ b/sound/soc/dwc/designware_i2s.c
> @@ -228,12 +228,14 @@ static int dw_i2s_hw_params(struct snd_pcm_substream *substream,
>   	i2s_disable_channels(dev, substream->stream);
>
>   	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
> +		i2s_write_reg(dev->i2s_base, TXFFR, 1);
>   		i2s_write_reg(dev->i2s_base, TCR(ch_reg), xfer_resolution);
>   		i2s_write_reg(dev->i2s_base, TFCR(ch_reg), 0x02);
>   		irq = i2s_read_reg(dev->i2s_base, IMR(ch_reg));
>   		i2s_write_reg(dev->i2s_base, IMR(ch_reg), irq & ~0x30);
>   		i2s_write_reg(dev->i2s_base, TER(ch_reg), 1);
>   	} else {
> +		i2s_write_reg(dev->i2s_base, RXFFR, 1);
>   		i2s_write_reg(dev->i2s_base, RCR(ch_reg), xfer_resolution);
>   		i2s_write_reg(dev->i2s_base, RFCR(ch_reg), 0x07);
>   		irq = i2s_read_reg(dev->i2s_base, IMR(ch_reg));
>

This should probably go into the prepare callback. prepare is for example 
also called when recovering from a underrun/overrun. Whereas hwparams is 
only called during initial setup of the stream.

[PATCH v2 1/6] ASoC: dwc: Remove unnecessary debug messages and tests

[Andrew Jackson]

On 12/12/14 09:31, Joe Perches wrote:
> On Fri, 2014-12-12 at 09:25 +0000, Andrew Jackson wrote:
>> The devm_XXX allocation functions print a message on failure,
>> so additional messages are not required.
> []
>> diff --git a/sound/soc/dwc/designware_i2s.c b/sound/soc/dwc/designware_i2s.c
> []
>> @@ -345,26 +345,17 @@ static int dw_i2s_probe(struct platform_device *pdev)
>>  	}
>>  
>>  	dw_i2s_dai = devm_kzalloc(&pdev->dev, sizeof(*dw_i2s_dai), GFP_KERNEL);
>> -	if (!dw_i2s_dai) {
>> -		dev_err(&pdev->dev, "mem allocation failed for dai driver\n");
>> +	if (!dw_i2s_dai)
>>  		return -ENOMEM;
>> -	}
> 
> ok.
>  
>>  	dw_i2s_dai->ops = &dw_i2s_dai_ops;
>>  	dw_i2s_dai->suspend = dw_i2s_suspend;
>>  	dw_i2s_dai->resume = dw_i2s_resume;
>>  
>>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> -	if (!res) {
>> -		dev_err(&pdev->dev, "no i2s resource defined\n");
>> -		return -ENODEV;
>> -	}
>> -
> 
> Why delete this?

Lars-Peter said that it was unnecessary: see <http://lists.infradead.org/pipermail/linux-arm-kernel/2014-December/308416.html>.
> 
>>  	dev->i2s_base = devm_ioremap_resource(&pdev->dev, res);
>> -	if (IS_ERR(dev->i2s_base)) {
>> -		dev_err(&pdev->dev, "ioremap fail for i2s_region\n");
>> +	if (IS_ERR(dev->i2s_base))
>>  		return PTR_ERR(dev->i2s_base);
>> -	}
> 
> or this?

Ditto

	Andrew

[PATCH v2 1/6] ASoC: dwc: Remove unnecessary debug messages and tests

[Joe Perches]

On Fri, 2014-12-12 at 09:39 +0000, Andrew Jackson wrote:
> On 12/12/14 09:31, Joe Perches wrote:
> > On Fri, 2014-12-12 at 09:25 +0000, Andrew Jackson wrote:
> >> The devm_XXX allocation functions print a message on failure,
> >> so additional messages are not required.
> > []
> >> diff --git a/sound/soc/dwc/designware_i2s.c b/sound/soc/dwc/designware_i2s.c
> > []
> >> @@ -345,26 +345,17 @@ static int dw_i2s_probe(struct platform_device *pdev)
> >>  	}
> >>  
> >>  	dw_i2s_dai = devm_kzalloc(&pdev->dev, sizeof(*dw_i2s_dai), GFP_KERNEL);
> >> -	if (!dw_i2s_dai) {
> >> -		dev_err(&pdev->dev, "mem allocation failed for dai driver\n");
> >> +	if (!dw_i2s_dai)
> >>  		return -ENOMEM;
> >> -	}
> > 
> > ok.
> >  
> >>  	dw_i2s_dai->ops = &dw_i2s_dai_ops;
> >>  	dw_i2s_dai->suspend = dw_i2s_suspend;
> >>  	dw_i2s_dai->resume = dw_i2s_resume;
> >>  
> >>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> >> -	if (!res) {
> >> -		dev_err(&pdev->dev, "no i2s resource defined\n");
> >> -		return -ENODEV;
> >> -	}
> >> -
> > 
> > Why delete this?
> 
> Lars-Peter said that it was unnecessary: see <http://lists.infradead.org/pipermail/linux-arm-kernel/2014-December/308416.html>.
> > 
> >>  	dev->i2s_base = devm_ioremap_resource(&pdev->dev, res);
> >> -	if (IS_ERR(dev->i2s_base)) {
> >> -		dev_err(&pdev->dev, "ioremap fail for i2s_region\n");
> >> +	if (IS_ERR(dev->i2s_base))
> >>  		return PTR_ERR(dev->i2s_base);
> >> -	}
> > 
> > or this?
> 
> Ditto

OK, but your commit message doesn't match the changes.

These messages are redundant not what most consider
debugging messages (ie: emitted at KERN_DEBUG).

The 2nd one isn't a devm_<foo> function and the last
one isn't an allocation.

[PATCH v2 2/6] ASoC: dwc: Ensure FIFOs are flushed to prevent channel swap

[Mark Brown]

On Fri, Dec 12, 2014 at 10:37:34AM +0100, Lars-Peter Clausen wrote:

> This should probably go into the prepare callback. prepare is for example
> also called when recovering from a underrun/overrun. Whereas hwparams is
> only called during initial setup of the stream.

Indeed, that's a better place.
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[PATCH v2 1/6] ASoC: dwc: Remove unnecessary debug messages and tests

[Mark Brown]

On Fri, Dec 12, 2014 at 09:25:00AM +0000, Andrew Jackson wrote:
> From: Andrew Jackson <Andrew.Jackson@arm.com>
> 
> The devm_XXX allocation functions print a message on failure,
> so additional messages are not required.

Applied, thanks.
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[PATCH v2 2/6] ASoC: dwc: Ensure FIFOs are flushed to prevent channel swap

[Andrew Jackson]

On 12/12/14 09:37, Lars-Peter Clausen wrote:
> On 12/12/2014 10:25 AM, Andrew Jackson wrote:
>> From: Andrew Jackson <Andrew.Jackson@arm.com>
>>
>> If the FIFOs aren't flushed, the left/right channels may be swapped:
>> this may occur if the FIFOs are not empty when the streams start.
>>
>> Signed-off-by: Andrew Jackson <Andrew.Jackson@arm.com>
>> ---
>>   sound/soc/dwc/designware_i2s.c |    2 ++
>>   1 files changed, 2 insertions(+), 0 deletions(-)
>>
>> diff --git a/sound/soc/dwc/designware_i2s.c b/sound/soc/dwc/designware_i2s.c
>> index ef771ea..b9d6a25 100644
>> --- a/sound/soc/dwc/designware_i2s.c
>> +++ b/sound/soc/dwc/designware_i2s.c
>> @@ -228,12 +228,14 @@ static int dw_i2s_hw_params(struct snd_pcm_substream *substream,
>>   	i2s_disable_channels(dev, substream->stream);
>>
>>   	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
>> +		i2s_write_reg(dev->i2s_base, TXFFR, 1);
>>   		i2s_write_reg(dev->i2s_base, TCR(ch_reg), xfer_resolution);
>>   		i2s_write_reg(dev->i2s_base, TFCR(ch_reg), 0x02);
>>   		irq = i2s_read_reg(dev->i2s_base, IMR(ch_reg));
>>   		i2s_write_reg(dev->i2s_base, IMR(ch_reg), irq & ~0x30);
>>   		i2s_write_reg(dev->i2s_base, TER(ch_reg), 1);
>>   	} else {
>> +		i2s_write_reg(dev->i2s_base, RXFFR, 1);
>>   		i2s_write_reg(dev->i2s_base, RCR(ch_reg), xfer_resolution);
>>   		i2s_write_reg(dev->i2s_base, RFCR(ch_reg), 0x07);
>>   		irq = i2s_read_reg(dev->i2s_base, IMR(ch_reg));
>>
> 
> This should probably go into the prepare callback. prepare is for example 
> also called when recovering from a underrun/overrun. Whereas hwparams is 
> only called during initial setup of the stream.

That's a good idea: thank you.  I'll rework the patch with this in mind.

	Andrew