Merge tag 'sound-6.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound

Pull sound updates from Takashi Iwai:
 "This one became bigger than usual, not in the total size but rather
  containing lots of small changes all over the places.

  The majority of changes are about ASoC, especially SOF / Intel stuff,
  and we see an interesting work for ASoC DAPM graph visualization,
  while there are many other code cleanup and refactoring, too.

  Core:
   - A deadlock fix at device disconnection
   - A new tool dapm-graph for visualising the DAPM state

  ASoC:
   - Large updates throughout the Intel audio drivers
   - Fixes and clarifications for the DAPM documentation
   - Cleanups of accessors for driver data, module labelling, and for
     constification
   - Modernsation and cleanup work in the Mediatek drivers
   - Several fixes and features for the DaVinci I2S driver
   - New drivers for several AMD and Intel platforms, Nuvoton NAU8325,
     Rockchip RK3308 and Texas Instruments PCM6240

  HD-audio:
   - Cleanup for CONFIG_PM dependencies
   - Cirrus HD-audio codec fixes and quirks

  Others:
   - Series of tree-wide fixes in Makefiles to use *-y
   - Additions of missing module descriptions
   - Scarlett2 USB mixer enhancements
   - A series of legacy emu10k1 fixes and improvements"

* tag 'sound-6.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound: (603 commits)
  ALSA: hda/realtek: Drop doubly quirk entry for 103c:8a2e
  ALSA: hda/realtek - fixed headset Mic not show
  ASoC: SOF: amd: Fix build error with built-in config
  ALSA: scarlett2: Increase mixer range to +12dB
  ALSA: scarlett2: Add S/PDIF source selection controls
  ALSA: core: Remove superfluous CONFIG_PM
  ALSA: Fix deadlocks with kctl removals at disconnection
  ASoC: audio-graph-card2: call of_node_get() before of_get_next_child()
  ASoC: SOF: amd: Correct spaces in Makefile
  ASoC: rt715-sdca-sdw: Fix wrong complete waiting in rt715_dev_resume()
  ASoC: Intel: sof_sdw_rt_amp: use dai parameter
  ASoC: Intel: sof_sdw: add dai parameter to rtd_init callback
  ASoC: Intel: sof_sdw: use .controls/.widgets to add controls/widgets
  ASoC: Intel: sof_sdw: add controls and dapm widgets in codec_info
  ASoC: Intel: sof_sdw: use generic name for controls/widgets
  ASoC: Intel: sof_sdw_cs_amp: rename Speakers to Speaker
  ASoC: Intel: maxim-common: change max98373 data to static
  ASoC: Intel: sof_sdw: add max98373 dapm routes
  ASoC: Intel: sof_rt5682: use max_98373_dai_link function
  ASoC: Intel: sof_nau8825: use max_98373_dai_link function
  ...

1 files changed, 220 insertions, 58 deletions

diff --git a/sound/soc/ti/davinci-i2s.c b/sound/soc/ti/davinci-i2s.c
index 07c8b2259208..0f15a743c798 100644
--- a/sound/soc/ti/davinci-i2s.c
+++ b/sound/soc/ti/davinci-i2s.c
@@ -19,7 +19,6 @@
 #include <linux/delay.h>
 #include <linux/io.h>
 #include <linux/clk.h>
-#include <linux/platform_data/davinci_asp.h>
 
 #include <sound/core.h>
 #include <sound/pcm.h>
@@ -62,6 +61,9 @@
 
 #define DAVINCI_MCBSP_SPCR_RRST		(1 << 0)
 #define DAVINCI_MCBSP_SPCR_RINTM(v)	((v) << 4)
+#define DAVINCI_MCBSP_SPCR_RJUST(v)	((v) << 13)
+#define DAVINCI_MCBSP_SPCR_RJUST_Z_LE	DAVINCI_MCBSP_SPCR_RJUST(0)
+#define DAVINCI_MCBSP_SPCR_RJUST_S_LE	DAVINCI_MCBSP_SPCR_RJUST(1)
 #define DAVINCI_MCBSP_SPCR_XRST		(1 << 16)
 #define DAVINCI_MCBSP_SPCR_XINTM(v)	((v) << 20)
 #define DAVINCI_MCBSP_SPCR_GRST		(1 << 22)
@@ -108,15 +110,10 @@ enum {
 	DAVINCI_MCBSP_WORD_32,
 };
 
-static const unsigned char data_type[SNDRV_PCM_FORMAT_S32_LE + 1] = {
-	[SNDRV_PCM_FORMAT_S8]		= 1,
-	[SNDRV_PCM_FORMAT_S16_LE]	= 2,
-	[SNDRV_PCM_FORMAT_S32_LE]	= 4,
-};
-
 static const unsigned char asp_word_length[SNDRV_PCM_FORMAT_S32_LE + 1] = {
 	[SNDRV_PCM_FORMAT_S8]		= DAVINCI_MCBSP_WORD_8,
 	[SNDRV_PCM_FORMAT_S16_LE]	= DAVINCI_MCBSP_WORD_16,
+	[SNDRV_PCM_FORMAT_S24_LE]	= DAVINCI_MCBSP_WORD_24,
 	[SNDRV_PCM_FORMAT_S32_LE]	= DAVINCI_MCBSP_WORD_32,
 };
 
@@ -135,6 +132,7 @@ struct davinci_mcbsp_dev {
 	int				mode;
 	u32				pcr;
 	struct clk			*clk;
+	struct clk			*ext_clk;
 	/*
 	 * Combining both channels into 1 element will at least double the
 	 * amount of time between servicing the dma channel, increase
@@ -159,8 +157,13 @@ struct davinci_mcbsp_dev {
 
 	unsigned int fmt;
 	int clk_div;
-	int clk_input_pin;
 	bool i2s_accurate_sck;
+
+	int tdm_slots;
+	int slot_width;
+
+	bool tx_framing_bit;
+	bool rx_framing_bit;
 };
 
 static inline void davinci_mcbsp_write_reg(struct davinci_mcbsp_dev *dev,
@@ -214,6 +217,63 @@ static void davinci_mcbsp_stop(struct davinci_mcbsp_dev *dev, int playback)
 	toggle_clock(dev, playback);
 }
 
+static int davinci_i2s_tdm_word_length(int tdm_slot_width)
+{
+	switch (tdm_slot_width) {
+	case 8:
+		return DAVINCI_MCBSP_WORD_8;
+	case 12:
+		return DAVINCI_MCBSP_WORD_12;
+	case 16:
+		return DAVINCI_MCBSP_WORD_16;
+	case 20:
+		return DAVINCI_MCBSP_WORD_20;
+	case 24:
+		return DAVINCI_MCBSP_WORD_24;
+	case 32:
+		return DAVINCI_MCBSP_WORD_32;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int davinci_i2s_set_tdm_slot(struct snd_soc_dai *cpu_dai,
+				    unsigned int tx_mask,
+				    unsigned int rx_mask,
+				    int slots, int slot_width)
+{
+	struct davinci_mcbsp_dev *dev = snd_soc_dai_get_drvdata(cpu_dai);
+
+	dev_dbg(dev->dev, "slots %d, slot_width %d\n", slots, slot_width);
+
+	if (slots > 128 || !slots) {
+		dev_err(dev->dev, "Invalid number of slots\n");
+		return -EINVAL;
+	}
+
+	if (rx_mask != (1 << slots) - 1) {
+		dev_err(dev->dev, "Invalid RX mask (0x%08x) : all slots must be used by McBSP\n",
+			rx_mask);
+		return -EINVAL;
+	}
+
+	if (tx_mask != (1 << slots) - 1) {
+		dev_err(dev->dev, "Invalid TX mask (0x%08x) : all slots must be used by McBSP\n",
+			tx_mask);
+		return -EINVAL;
+	}
+
+	if (davinci_i2s_tdm_word_length(slot_width) < 0) {
+		dev_err(dev->dev, "%s: Unsupported slot_width %d\n", __func__, slot_width);
+		return -EINVAL;
+	}
+
+	dev->tdm_slots = slots;
+	dev->slot_width = slot_width;
+
+	return 0;
+}
+
 #define DEFAULT_BITPERSAMPLE	16
 
 static int davinci_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
@@ -221,6 +281,7 @@ static int davinci_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
 {
 	struct davinci_mcbsp_dev *dev = snd_soc_dai_get_drvdata(cpu_dai);
 	unsigned int pcr;
+	unsigned int spcr;
 	unsigned int srgr;
 	bool inv_fs = false;
 	/* Attention srgr is updated by hw_params! */
@@ -229,6 +290,23 @@ static int davinci_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
 		DAVINCI_MCBSP_SRGR_FWID(DEFAULT_BITPERSAMPLE - 1);
 
 	dev->fmt = fmt;
+
+	spcr = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
+	switch (fmt & SND_SOC_DAIFMT_CLOCK_MASK) {
+	case SND_SOC_DAIFMT_CONT:
+		spcr |= DAVINCI_MCBSP_SPCR_FREE;
+		dev_dbg(dev->dev, "Free-running mode ON\n");
+		break;
+	case SND_SOC_DAIFMT_GATED:
+		spcr &= ~DAVINCI_MCBSP_SPCR_FREE;
+		dev_dbg(dev->dev, "Free-running mode OFF\n");
+		break;
+	default:
+		dev_err(dev->dev, "Invalid clock gating\n");
+		return -EINVAL;
+	}
+	davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr);
+
 	/* set master/slave audio interface */
 	switch (fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) {
 	case SND_SOC_DAIFMT_BP_FP:
@@ -239,28 +317,30 @@ static int davinci_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
 			DAVINCI_MCBSP_PCR_CLKRM;
 		break;
 	case SND_SOC_DAIFMT_BC_FP:
-		pcr = DAVINCI_MCBSP_PCR_FSRM | DAVINCI_MCBSP_PCR_FSXM;
-		/*
-		 * Selection of the clock input pin that is the
-		 * input for the Sample Rate Generator.
-		 * McBSP FSR and FSX are driven by the Sample Rate
-		 * Generator.
-		 */
-		switch (dev->clk_input_pin) {
-		case MCBSP_CLKS:
-			pcr |= DAVINCI_MCBSP_PCR_CLKXM |
-				DAVINCI_MCBSP_PCR_CLKRM;
-			break;
-		case MCBSP_CLKR:
-			pcr |= DAVINCI_MCBSP_PCR_SCLKME;
-			break;
-		default:
-			dev_err(dev->dev, "bad clk_input_pin\n");
+		if (dev->tdm_slots || dev->slot_width) {
+			dev_err(dev->dev, "TDM is not supported for BC_FP format\n");
 			return -EINVAL;
 		}
 
+		/*
+		 * McBSP CLKR pin is the input for the Sample Rate Generator.
+		 * McBSP FSR and FSX are driven by the Sample Rate Generator.
+		 */
+		pcr = DAVINCI_MCBSP_PCR_FSRM | DAVINCI_MCBSP_PCR_FSXM;
+		pcr |= DAVINCI_MCBSP_PCR_SCLKME;
+		break;
+	case SND_SOC_DAIFMT_BP_FC:
+		/* cpu is bitclock provider */
+		pcr = DAVINCI_MCBSP_PCR_CLKXM |
+			DAVINCI_MCBSP_PCR_CLKRM;
 		break;
+
 	case SND_SOC_DAIFMT_BC_FC:
+		if (dev->tdm_slots || dev->slot_width) {
+			dev_err(dev->dev, "TDM is not supported for BC_FC format\n");
+			return -EINVAL;
+		}
+
 		/* codec is master */
 		pcr = 0;
 		break;
@@ -380,30 +460,58 @@ static int davinci_i2s_hw_params(struct snd_pcm_substream *substream,
 	struct davinci_mcbsp_dev *dev = snd_soc_dai_get_drvdata(dai);
 	struct snd_interval *i = NULL;
 	int mcbsp_word_length, master;
-	unsigned int rcr, xcr, srgr, clk_div, freq, framesize;
+	unsigned int clk_div, freq, framesize;
+	unsigned int srgr = 0;
+	unsigned int rcr = 0;
+	unsigned int xcr = 0;
 	u32 spcr;
 	snd_pcm_format_t fmt;
 	unsigned element_cnt = 1;
 
-	/* general line settings */
 	spcr = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
+
+	/* Determine xfer data type */
+	fmt = params_format(params);
+	switch (fmt) {
+	case SNDRV_PCM_FORMAT_S16_LE:
+	case SNDRV_PCM_FORMAT_S32_LE:
+		break;
+	case SNDRV_PCM_FORMAT_S24_LE:
+		spcr |= DAVINCI_MCBSP_SPCR_RJUST_S_LE;
+		break;
+	default:
+		dev_warn(dev->dev, "davinci-i2s: unsupported PCM format\n");
+		return -EINVAL;
+	}
+
+	/* general line settings */
 	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
-		spcr |= DAVINCI_MCBSP_SPCR_RINTM(3) | DAVINCI_MCBSP_SPCR_FREE;
+		spcr |= DAVINCI_MCBSP_SPCR_RINTM(3);
 		davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr);
 	} else {
-		spcr |= DAVINCI_MCBSP_SPCR_XINTM(3) | DAVINCI_MCBSP_SPCR_FREE;
+		spcr |= DAVINCI_MCBSP_SPCR_XINTM(3);
 		davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr);
 	}
 
 	master = dev->fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK;
 	fmt = params_format(params);
-	mcbsp_word_length = asp_word_length[fmt];
+	if (dev->slot_width)
+		mcbsp_word_length = davinci_i2s_tdm_word_length(dev->slot_width);
+	else
+		mcbsp_word_length = asp_word_length[fmt];
+
+	if (mcbsp_word_length < 0)
+		return mcbsp_word_length;
 
 	switch (master) {
 	case SND_SOC_DAIFMT_BP_FP:
-		freq = clk_get_rate(dev->clk);
-		srgr = DAVINCI_MCBSP_SRGR_FSGM |
-		       DAVINCI_MCBSP_SRGR_CLKSM;
+		if (dev->ext_clk) {
+			freq = clk_get_rate(dev->ext_clk);
+		} else {
+			freq = clk_get_rate(dev->clk);
+			srgr = DAVINCI_MCBSP_SRGR_CLKSM;
+		}
+		srgr |= DAVINCI_MCBSP_SRGR_FSGM;
 		srgr |= DAVINCI_MCBSP_SRGR_FWID(mcbsp_word_length *
 						8 - 1);
 		if (dev->i2s_accurate_sck) {
@@ -434,6 +542,23 @@ static int davinci_i2s_hw_params(struct snd_pcm_substream *substream,
 		clk_div &= 0xFF;
 		srgr |= clk_div;
 		break;
+	case SND_SOC_DAIFMT_BP_FC:
+		if (dev->ext_clk) {
+			freq = clk_get_rate(dev->ext_clk);
+		} else {
+			freq = clk_get_rate(dev->clk);
+			srgr = DAVINCI_MCBSP_SRGR_CLKSM;
+		}
+		if (dev->tdm_slots && dev->slot_width) {
+			clk_div = freq / (params->rate_num * params->rate_den)
+				 / (dev->tdm_slots * dev->slot_width) - 1;
+		} else {
+			clk_div = freq / (mcbsp_word_length * 16) /
+				  params->rate_num * params->rate_den;
+		}
+		clk_div &= 0xFF;
+		srgr |= clk_div;
+		break;
 	case SND_SOC_DAIFMT_BC_FC:
 		/* Clock and frame sync given from external sources */
 		i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
@@ -450,8 +575,6 @@ static int davinci_i2s_hw_params(struct snd_pcm_substream *substream,
 	}
 	davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SRGR_REG, srgr);
 
-	rcr = DAVINCI_MCBSP_RCR_RFIG;
-	xcr = DAVINCI_MCBSP_XCR_XFIG;
 	if (dev->mode == MOD_DSP_B) {
 		rcr |= DAVINCI_MCBSP_RCR_RDATDLY(0);
 		xcr |= DAVINCI_MCBSP_XCR_XDATDLY(0);
@@ -459,11 +582,14 @@ static int davinci_i2s_hw_params(struct snd_pcm_substream *substream,
 		rcr |= DAVINCI_MCBSP_RCR_RDATDLY(1);
 		xcr |= DAVINCI_MCBSP_XCR_XDATDLY(1);
 	}
-	/* Determine xfer data type */
-	fmt = params_format(params);
-	if ((fmt > SNDRV_PCM_FORMAT_S32_LE) || !data_type[fmt]) {
-		printk(KERN_WARNING "davinci-i2s: unsupported PCM format\n");
-		return -EINVAL;
+
+	if (dev->tx_framing_bit) {
+		xcr &= ~DAVINCI_MCBSP_XCR_XDATDLY(1);
+		xcr |= DAVINCI_MCBSP_XCR_XDATDLY(2);
+	}
+	if (dev->rx_framing_bit) {
+		rcr &= ~DAVINCI_MCBSP_RCR_RDATDLY(1);
+		rcr |= DAVINCI_MCBSP_RCR_RDATDLY(2);
 	}
 
 	if (params_channels(params) == 2) {
@@ -489,13 +615,17 @@ static int davinci_i2s_hw_params(struct snd_pcm_substream *substream,
 			return -EINVAL;
 		}
 	}
-	mcbsp_word_length = asp_word_length[fmt];
 
 	switch (master) {
 	case SND_SOC_DAIFMT_BP_FP:
 	case SND_SOC_DAIFMT_BP_FC:
-		rcr |= DAVINCI_MCBSP_RCR_RFRLEN1(0);
-		xcr |= DAVINCI_MCBSP_XCR_XFRLEN1(0);
+		if (dev->tdm_slots > 0) {
+			rcr |= DAVINCI_MCBSP_RCR_RFRLEN1(dev->tdm_slots - 1);
+			xcr |= DAVINCI_MCBSP_XCR_XFRLEN1(dev->tdm_slots - 1);
+		} else {
+			rcr |= DAVINCI_MCBSP_RCR_RFRLEN1(0);
+			xcr |= DAVINCI_MCBSP_XCR_XFRLEN1(0);
+		}
 		break;
 	case SND_SOC_DAIFMT_BC_FC:
 	case SND_SOC_DAIFMT_BC_FP:
@@ -599,6 +729,7 @@ static void davinci_i2s_shutdown(struct snd_pcm_substream *substream,
 
 #define DAVINCI_I2S_RATES	SNDRV_PCM_RATE_8000_96000
 #define DAVINCI_I2S_FORMATS	(SNDRV_PCM_FMTBIT_S16_LE | \
+				 SNDRV_PCM_FMTBIT_S24_LE | \
 				 SNDRV_PCM_FMTBIT_S32_LE)
 
 static int davinci_i2s_dai_probe(struct snd_soc_dai *dai)
@@ -620,19 +751,20 @@ static const struct snd_soc_dai_ops davinci_i2s_dai_ops = {
 	.hw_params	= davinci_i2s_hw_params,
 	.set_fmt	= davinci_i2s_set_dai_fmt,
 	.set_clkdiv	= davinci_i2s_dai_set_clkdiv,
+	.set_tdm_slot   = davinci_i2s_set_tdm_slot,
 
 };
 
 static struct snd_soc_dai_driver davinci_i2s_dai = {
 	.playback = {
 		.channels_min = 2,
-		.channels_max = 2,
+		.channels_max = 128,
 		.rates = DAVINCI_I2S_RATES,
 		.formats = DAVINCI_I2S_FORMATS,
 	},
 	.capture = {
 		.channels_min = 2,
-		.channels_max = 2,
+		.channels_max = 128,
 		.rates = DAVINCI_I2S_RATES,
 		.formats = DAVINCI_I2S_FORMATS,
 	},
@@ -676,6 +808,9 @@ static int davinci_i2s_probe(struct platform_device *pdev)
 
 	dev->base = io_base;
 
+	dev->tx_framing_bit = of_property_read_bool(pdev->dev.of_node, "ti,T1-framing-tx");
+	dev->rx_framing_bit = of_property_read_bool(pdev->dev.of_node, "ti,T1-framing-rx");
+
 	/* setup DMA, first TX, then RX */
 	dma_data = &dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK];
 	dma_data->addr = (dma_addr_t)(mem->start + DAVINCI_MCBSP_DXR_REG);
@@ -707,12 +842,36 @@ static int davinci_i2s_probe(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
-	dev->clk = clk_get(&pdev->dev, NULL);
+	/*
+	 * The optional is there for backward compatibility.
+	 * If 'fck' is not present, the clk_get(dev, NULL) that follows may find something
+	 */
+	dev->clk = devm_clk_get_optional(&pdev->dev, "fck");
 	if (IS_ERR(dev->clk))
-		return -ENODEV;
-	ret = clk_enable(dev->clk);
+		return dev_err_probe(&pdev->dev, PTR_ERR(dev->clk), "Invalid functional clock\n");
+	if (!dev->clk) {
+		dev->clk = devm_clk_get(&pdev->dev, NULL);
+		if (IS_ERR(dev->clk))
+			return dev_err_probe(&pdev->dev, PTR_ERR(dev->clk),
+					     "Missing functional clock\n");
+	}
+
+	dev->ext_clk = devm_clk_get_optional(&pdev->dev, "clks");
+	if (IS_ERR(dev->ext_clk))
+		return dev_err_probe(&pdev->dev, PTR_ERR(dev->ext_clk), "Invalid external clock\n");
+
+	ret = clk_prepare_enable(dev->clk);
 	if (ret)
-		goto err_put_clk;
+		return ret;
+
+	if (dev->ext_clk) {
+		dev_dbg(&pdev->dev, "External clock used for sample rate generator\n");
+		ret = clk_prepare_enable(dev->ext_clk);
+		if (ret) {
+			dev_err_probe(&pdev->dev, ret, "Failed to enable external clock\n");
+			goto err_disable_clk;
+		}
+	}
 
 	dev->dev = &pdev->dev;
 	dev_set_drvdata(&pdev->dev, dev);
@@ -720,11 +879,11 @@ static int davinci_i2s_probe(struct platform_device *pdev)
 	ret = snd_soc_register_component(&pdev->dev, &davinci_i2s_component,
 					 &davinci_i2s_dai, 1);
 	if (ret != 0)
-		goto err_release_clk;
+		goto err_disable_ext_clk;
 
 	ret = edma_pcm_platform_register(&pdev->dev);
 	if (ret) {
-		dev_err(&pdev->dev, "register PCM failed: %d\n", ret);
+		dev_err_probe(&pdev->dev, ret, "register PCM failed\n");
 		goto err_unregister_component;
 	}
 
@@ -732,10 +891,12 @@ static int davinci_i2s_probe(struct platform_device *pdev)
 
 err_unregister_component:
 	snd_soc_unregister_component(&pdev->dev);
-err_release_clk:
-	clk_disable(dev->clk);
-err_put_clk:
-	clk_put(dev->clk);
+err_disable_ext_clk:
+	if (dev->ext_clk)
+		clk_disable_unprepare(dev->ext_clk);
+err_disable_clk:
+	clk_disable_unprepare(dev->clk);
+
 	return ret;
 }
 
@@ -745,9 +906,10 @@ static void davinci_i2s_remove(struct platform_device *pdev)
 
 	snd_soc_unregister_component(&pdev->dev);
 
-	clk_disable(dev->clk);
-	clk_put(dev->clk);
-	dev->clk = NULL;
+	clk_disable_unprepare(dev->clk);
+
+	if (dev->ext_clk)
+		clk_disable_unprepare(dev->ext_clk);
 }
 
 static const struct of_device_id davinci_i2s_match[] __maybe_unused = {