linux-nv-oot/sound/soc/tegra-alt/tegra210_i2s_alt.c

/*
 * tegra210_i2s.c - Tegra210 I2S driver
 *
 * Copyright (c) 2014 NVIDIA CORPORATION.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#include <linux/clk.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <linux/pinctrl/consumer.h>
#include <linux/of_device.h>
#include <linux/debugfs.h>

#include "tegra210_xbar_alt.h"
#include "tegra210_i2s_alt.h"

#define DRV_NAME "tegra210-i2s"

static int tegra210_i2s_set_clock_rate(struct device *dev, int clock_rate)
{
#ifndef CONFIG_MACH_GRENADA
	unsigned int val;
	struct tegra210_i2s *i2s = dev_get_drvdata(dev);
	int ret;

	regmap_read(i2s->regmap, TEGRA210_I2S_CTRL, &val);

	if ((val & TEGRA210_I2S_CTRL_MASTER_EN_MASK) ==
			TEGRA210_I2S_CTRL_MASTER_EN) {
		ret = clk_set_parent(i2s->clk_i2s, i2s->clk_pll_a_out0);
		if (ret) {
			dev_err(dev, "Can't set parent of I2S clock\n");
			return ret;
		}

		ret = clk_set_rate(i2s->clk_i2s, clock_rate);
		if (ret) {
			dev_err(dev, "Can't set I2S clock rate: %d\n", ret);
			return ret;
		}
	} else {
		ret = clk_set_rate(i2s->clk_i2s_sync, clock_rate);
		if (ret) {
			dev_err(dev, "Can't set I2S sync clock rate\n");
			return ret;
		}

		ret = clk_set_parent(i2s->clk_i2s, i2s->clk_i2s_sync);
		if (ret) {
			dev_err(dev, "Can't set parent of i2s clock\n");
			return ret;
		}
	}

	return ret;
#else
	return 0;
#endif
}

static int tegra210_i2s_runtime_suspend(struct device *dev)
{
	struct tegra210_i2s *i2s = dev_get_drvdata(dev);
	int ret;

	if (!IS_ERR(i2s->pin_idle_state)) {
		ret = pinctrl_select_state(i2s->pinctrl, i2s->pin_idle_state);
		if (ret < 0)
			dev_err(dev, "setting dap pinctrl idle state failed\n");
	}

	regcache_cache_only(i2s->regmap, true);
	clk_disable_unprepare(i2s->clk_i2s);

	return 0;
}

static int tegra210_i2s_runtime_resume(struct device *dev)
{
	struct tegra210_i2s *i2s = dev_get_drvdata(dev);
	int ret;

	if (!IS_ERR(i2s->pin_default_state)) {
		ret = pinctrl_select_state(i2s->pinctrl,
					i2s->pin_default_state);
		if (ret < 0)
			dev_err(dev, "setting dap pinctrl default state failed\n");
	}

	ret = clk_prepare_enable(i2s->clk_i2s);
	if (ret) {
		dev_err(dev, "clk_enable failed: %d\n", ret);
		return ret;
	}
	regcache_cache_only(i2s->regmap, false);

	return 0;
}

static int tegra210_i2s_set_fmt(struct snd_soc_dai *dai,
				unsigned int fmt)
{
	struct tegra210_i2s *i2s = snd_soc_dai_get_drvdata(dai);
	unsigned int mask, val;

	mask = TEGRA210_I2S_CTRL_EDGE_CTRL_MASK;
	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_NB_NF:
		val = TEGRA210_I2S_CTRL_EDGE_CTRL_POS_EDGE;
		break;
	case SND_SOC_DAIFMT_IB_NF:
		val = TEGRA210_I2S_CTRL_EDGE_CTRL_NEG_EDGE;
		break;
	default:
		return -EINVAL;
	}

	mask |= TEGRA210_I2S_CTRL_MASTER_EN_MASK;
	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBS_CFS:
		val &= ~(TEGRA210_I2S_CTRL_MASTER_EN);
		break;
	case SND_SOC_DAIFMT_CBM_CFM:
		val |= TEGRA210_I2S_CTRL_MASTER_EN;
		break;
	default:
		return -EINVAL;
	}

	mask |= TEGRA210_I2S_CTRL_FRAME_FORMAT_MASK |
		TEGRA210_I2S_CTRL_LRCK_POLARITY_MASK;
	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_DSP_A:
		val |= TEGRA210_I2S_CTRL_FRAME_FORMAT_FSYNC_MODE;
		val |= TEGRA210_I2S_CTRL_LRCK_POLARITY_LOW;
		break;
	case SND_SOC_DAIFMT_DSP_B:
		val |= TEGRA210_I2S_CTRL_FRAME_FORMAT_FSYNC_MODE;
		val |= TEGRA210_I2S_CTRL_LRCK_POLARITY_HIGH;
		break;
	case SND_SOC_DAIFMT_I2S:
		val |= TEGRA210_I2S_CTRL_FRAME_FORMAT_LRCK_MODE;
		val |= TEGRA210_I2S_CTRL_LRCK_POLARITY_LOW;
		break;
	case SND_SOC_DAIFMT_RIGHT_J:
		val |= TEGRA210_I2S_CTRL_FRAME_FORMAT_LRCK_MODE;
		val |= TEGRA210_I2S_CTRL_LRCK_POLARITY_LOW;
		break;
	case SND_SOC_DAIFMT_LEFT_J:
		val |= TEGRA210_I2S_CTRL_FRAME_FORMAT_LRCK_MODE;
		val |= TEGRA210_I2S_CTRL_LRCK_POLARITY_LOW;
		break;
	default:
		return -EINVAL;
	}

	pm_runtime_get_sync(dai->dev);
	regmap_update_bits(i2s->regmap, TEGRA210_I2S_CTRL, mask, val);
	/* FIXME: global enabling */
	regmap_update_bits(i2s->regmap, TEGRA210_I2S_ENABLE,
					TEGRA210_I2S_EN_MASK, TEGRA210_I2S_EN);

	pm_runtime_put(dai->dev);

	return 0;
}

static int tegra210_i2s_set_dai_sysclk(struct snd_soc_dai *dai,
		int clk_id, unsigned int freq, int dir)
{
	struct tegra210_i2s *i2s = snd_soc_dai_get_drvdata(dai);

	i2s->srate = freq;

	return 0;
}

static int tegra210_i2s_hw_params(struct snd_pcm_substream *substream,
				 struct snd_pcm_hw_params *params,
				 struct snd_soc_dai *dai)
{
	struct device *dev = dai->dev;
	struct tegra210_i2s *i2s = snd_soc_dai_get_drvdata(dai);
	unsigned int mask, val, reg, frame_format;
	int ret, sample_size, channels, srate, i2sclock, bitcnt;
	struct tegra210_xbar_cif_conf cif_conf;

	channels = params_channels(params);
	if (channels < 1) {
		dev_err(dev, "Doesn't support %d channels\n", channels);
		return -EINVAL;
	}

	mask = TEGRA210_I2S_CTRL_BIT_SIZE_MASK;
	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
		val = TEGRA210_I2S_CTRL_BIT_SIZE_16;
		sample_size = 16;
		break;
	case SNDRV_PCM_FORMAT_S24_LE:
		val = TEGRA210_I2S_CTRL_BIT_SIZE_24;
		sample_size = 24;
		break;
	case SNDRV_PCM_FORMAT_S32_LE:
		val = TEGRA210_I2S_CTRL_BIT_SIZE_32;
		sample_size = 32;
		break;
	default:
		dev_err(dev, "Wrong format!\n");
		return -EINVAL;
	}

	regmap_update_bits(i2s->regmap, TEGRA210_I2S_CTRL, mask, val);

	srate = i2s->srate;

	regmap_read(i2s->regmap, TEGRA210_I2S_CTRL, &val);

	frame_format = val & TEGRA210_I2S_CTRL_FRAME_FORMAT_MASK;

	if (frame_format == TEGRA210_I2S_CTRL_FRAME_FORMAT_FSYNC_MODE) {
		i2sclock = srate * channels * sample_size;
		regmap_write(i2s->regmap, TEGRA210_I2S_SLOT_CTRL, channels - 1);
		regmap_write(i2s->regmap, TEGRA210_I2S_AXBAR_TX_SLOT_CTRL,
						((1 << channels) - 1));
		regmap_write(i2s->regmap, TEGRA210_I2S_AXBAR_RX_SLOT_CTRL,
						((1 << channels) - 1));
	} else
		i2sclock = srate * channels * sample_size * 2;

	bitcnt = (i2sclock / srate) - 1;
	if ((bitcnt < 0) ||
		(bitcnt > TEGRA210_I2S_TIMING_CHANNEL_BIT_CNT_MASK)) {
		dev_err(dev, "Can't set channel bit count\n");
		return -EINVAL;
	}

	ret = tegra210_i2s_set_clock_rate(dev, i2sclock);
	if (ret) {
		dev_err(dev, "Can't set I2S clock rate: %d\n", ret);
		return ret;
	}

	if ((frame_format == TEGRA210_I2S_FRAME_FORMAT_LRCK) && (channels > 1)) {
		val = (bitcnt >> 1) <<
			TEGRA210_I2S_TIMING_CHANNEL_BIT_CNT_SHIFT;
	} else
		val = bitcnt << TEGRA210_I2S_TIMING_CHANNEL_BIT_CNT_SHIFT;

	if (i2sclock % (2 * srate))
		val |= TEGRA210_I2S_TIMING_NON_SYM_EN;

	regmap_write(i2s->regmap, TEGRA210_I2S_TIMING, val);

	regmap_update_bits(i2s->regmap, TEGRA210_I2S_CTRL,
		TEGRA210_I2S_CTRL_FSYNC_WIDTH_MASK,
		31 << TEGRA210_I2S_CTRL_FSYNC_WIDTH_SHIFT);

	cif_conf.threshold = 0;
	cif_conf.audio_channels = channels;
	cif_conf.client_channels = channels;
	cif_conf.audio_bits = (sample_size == 16 ? TEGRA210_AUDIOCIF_BITS_16 :
						TEGRA210_AUDIOCIF_BITS_32);

	cif_conf.client_bits = (sample_size == 16 ? TEGRA210_AUDIOCIF_BITS_16 :
						TEGRA210_AUDIOCIF_BITS_32);
	cif_conf.expand = 0;
	cif_conf.stereo_conv = 0;
	cif_conf.replicate = 0;
	cif_conf.truncate = 0;
	cif_conf.mono_conv = 0;

	/* As a COCEC DAI, CAPTURE is transmit */
	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
		regmap_update_bits(i2s->regmap, TEGRA210_I2S_AXBAR_RX_CTRL,
			TEGRA210_I2S_AXBAR_RX_CTRL_DATA_OFFSET_MASK,
			(1 << TEGRA210_I2S_AXBAR_RX_CTRL_DATA_OFFSET_SHIFT));

		reg = TEGRA210_I2S_AXBAR_RX_CIF_CTRL;
	} else {
		regmap_update_bits(i2s->regmap, TEGRA210_I2S_AXBAR_TX_CTRL,
			TEGRA210_I2S_AXBAR_TX_CTRL_DATA_OFFSET_MASK,
			(1 << TEGRA210_I2S_AXBAR_TX_CTRL_DATA_OFFSET_SHIFT));

		reg = TEGRA210_I2S_AXBAR_TX_CIF_CTRL;
	}

	i2s->soc_data->set_audio_cif(i2s->regmap, reg, &cif_conf);

	return 0;
}

static int tegra210_i2s_codec_probe(struct snd_soc_codec *codec)
{
	struct tegra210_i2s *i2s = snd_soc_codec_get_drvdata(codec);
	int ret;

	codec->control_data = i2s->regmap;
	ret = snd_soc_codec_set_cache_io(codec, 64, 32, SND_SOC_REGMAP);
	if (ret != 0) {
		dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
		return ret;
	}

	return 0;
}

static struct snd_soc_dai_ops tegra210_i2s_dai_ops = {
	.set_fmt	= tegra210_i2s_set_fmt,
	.hw_params	= tegra210_i2s_hw_params,
	.set_sysclk	= tegra210_i2s_set_dai_sysclk,
};

static struct snd_soc_dai_driver tegra210_i2s_dais[] = {
	{
		.name = "CIF",
		.playback = {
			.stream_name = "CIF Receive",
			.channels_min = 1,
			.channels_max = 16,
			.rates = SNDRV_PCM_RATE_8000_96000,
			.formats = SNDRV_PCM_FMTBIT_S16_LE,
		},
		.capture = {
			.stream_name = "CIF Transmit",
			.channels_min = 1,
			.channels_max = 16,
			.rates = SNDRV_PCM_RATE_8000_96000,
			.formats = SNDRV_PCM_FMTBIT_S16_LE,
		},
	},
	{
		.name = "DAP",
		.playback = {
			.stream_name = "DAP Receive",
			.channels_min = 1,
			.channels_max = 16,
			.rates = SNDRV_PCM_RATE_8000_96000,
			.formats = SNDRV_PCM_FMTBIT_S16_LE,
		},
		.capture = {
			.stream_name = "DAP Transmit",
			.channels_min = 1,
			.channels_max = 16,
			.rates = SNDRV_PCM_RATE_8000_96000,
			.formats = SNDRV_PCM_FMTBIT_S16_LE,
		},
		.ops = &tegra210_i2s_dai_ops,
		.symmetric_rates = 1,
	}
};

static const struct snd_kcontrol_new tegra210_i2s_controls[] = {
	SOC_SINGLE("Loopback", TEGRA210_I2S_CTRL, 8, 1, 0),
};

static const struct snd_soc_dapm_widget tegra210_i2s_widgets[] = {
	SND_SOC_DAPM_AIF_IN("CIF RX", NULL, 0, SND_SOC_NOPM,
				0, 0),
	SND_SOC_DAPM_AIF_OUT("CIF TX", NULL, 0, SND_SOC_NOPM,
				0, 0),
	SND_SOC_DAPM_AIF_IN("DAP RX", NULL, 0, TEGRA210_I2S_AXBAR_TX_ENABLE,
				TEGRA210_I2S_AXBAR_TX_EN_SHIFT, 0),
	SND_SOC_DAPM_AIF_OUT("DAP TX", NULL, 0, TEGRA210_I2S_AXBAR_RX_ENABLE,
				TEGRA210_I2S_AXBAR_RX_EN_SHIFT, 0),
};

static const struct snd_soc_dapm_route tegra210_i2s_routes[] = {
	{ "CIF RX",       NULL, "CIF Receive" },
	{ "DAP TX",       NULL, "CIF RX" },
	{ "DAP Transmit", NULL, "DAP TX" },

	{ "DAP RX",       NULL, "DAP Receive" },
	{ "CIF TX",       NULL, "DAP RX" },
	{ "CIF Transmit", NULL, "CIF TX" },
};

static struct snd_soc_codec_driver tegra210_i2s_codec = {
	.probe = tegra210_i2s_codec_probe,
	.dapm_widgets = tegra210_i2s_widgets,
	.num_dapm_widgets = ARRAY_SIZE(tegra210_i2s_widgets),
	.dapm_routes = tegra210_i2s_routes,
	.num_dapm_routes = ARRAY_SIZE(tegra210_i2s_routes),
	.controls = tegra210_i2s_controls,
	.num_controls = ARRAY_SIZE(tegra210_i2s_controls),
};

static bool tegra210_i2s_wr_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case TEGRA210_I2S_AXBAR_RX_ENABLE:
	case TEGRA210_I2S_AXBAR_RX_INT_MASK:
	case TEGRA210_I2S_AXBAR_RX_INT_SET:
	case TEGRA210_I2S_AXBAR_RX_INT_CLEAR:
	case TEGRA210_I2S_AXBAR_RX_CIF_CTRL:
	case TEGRA210_I2S_AXBAR_RX_CTRL:
	case TEGRA210_I2S_AXBAR_RX_SLOT_CTRL:
	case TEGRA210_I2S_AXBAR_RX_CLK_TRIM:
	case TEGRA210_I2S_AXBAR_TX_ENABLE:
	case TEGRA210_I2S_AXBAR_TX_INT_MASK:
	case TEGRA210_I2S_AXBAR_TX_INT_SET:
	case TEGRA210_I2S_AXBAR_TX_INT_CLEAR:
	case TEGRA210_I2S_AXBAR_TX_CIF_CTRL:
	case TEGRA210_I2S_AXBAR_TX_CTRL:
	case TEGRA210_I2S_AXBAR_TX_SLOT_CTRL:
	case TEGRA210_I2S_AXBAR_TX_CLK_TRIM:
	case TEGRA210_I2S_ENABLE:
	case TEGRA210_I2S_SOFT_RESET:
	case TEGRA210_I2S_CG:
	case TEGRA210_I2S_CTRL:
	case TEGRA210_I2S_TIMING:
	case TEGRA210_I2S_SLOT_CTRL:
	case TEGRA210_I2S_CLK_TRIM:
		return true;
	default:
		return false;
	};
}

static bool tegra210_i2s_rd_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case TEGRA210_I2S_AXBAR_RX_STATUS:
	case TEGRA210_I2S_AXBAR_RX_CIF_FIFO_STATUS:
	case TEGRA210_I2S_AXBAR_RX_ENABLE:
	case TEGRA210_I2S_AXBAR_RX_INT_MASK:
	case TEGRA210_I2S_AXBAR_RX_INT_SET:
	case TEGRA210_I2S_AXBAR_RX_INT_CLEAR:
	case TEGRA210_I2S_AXBAR_RX_CIF_CTRL:
	case TEGRA210_I2S_AXBAR_RX_CTRL:
	case TEGRA210_I2S_AXBAR_RX_SLOT_CTRL:
	case TEGRA210_I2S_AXBAR_RX_CLK_TRIM:
	case TEGRA210_I2S_AXBAR_RX_INT_STATUS:
	case TEGRA210_I2S_AXBAR_RX_SOFT_RESET:
	case TEGRA210_I2S_AXBAR_TX_STATUS:
	case TEGRA210_I2S_AXBAR_TX_CIF_FIFO_STATUS:
	case TEGRA210_I2S_AXBAR_TX_ENABLE:
	case TEGRA210_I2S_AXBAR_TX_INT_MASK:
	case TEGRA210_I2S_AXBAR_TX_INT_SET:
	case TEGRA210_I2S_AXBAR_TX_INT_CLEAR:
	case TEGRA210_I2S_AXBAR_TX_CIF_CTRL:
	case TEGRA210_I2S_AXBAR_TX_CTRL:
	case TEGRA210_I2S_AXBAR_TX_SLOT_CTRL:
	case TEGRA210_I2S_AXBAR_TX_CLK_TRIM:
	case TEGRA210_I2S_AXBAR_TX_INT_STATUS:
	case TEGRA210_I2S_AXBAR_TX_SOFT_RESET:
	case TEGRA210_I2S_ENABLE:
	case TEGRA210_I2S_STATUS:
	case TEGRA210_I2S_SOFT_RESET:
	case TEGRA210_I2S_CG:
	case TEGRA210_I2S_CTRL:
	case TEGRA210_I2S_TIMING:
	case TEGRA210_I2S_SLOT_CTRL:
	case TEGRA210_I2S_CLK_TRIM:
	case TEGRA210_I2S_INT_STATUS:
		return true;
	default:
		return false;
	};
}

static bool tegra210_i2s_volatile_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case TEGRA210_I2S_AXBAR_RX_INT_STATUS:
	case TEGRA210_I2S_AXBAR_TX_INT_STATUS:
	case TEGRA210_I2S_INT_STATUS:
	case TEGRA210_I2S_AXBAR_RX_SOFT_RESET:
	case TEGRA210_I2S_AXBAR_TX_SOFT_RESET:
		return true;
	default:
		return false;
	};
}

static const struct regmap_config tegra210_i2s_regmap_config = {
	.reg_bits = 32,
	.reg_stride = 4,
	.val_bits = 32,
	.max_register = TEGRA210_I2S_CLK_TRIM,
	.writeable_reg = tegra210_i2s_wr_reg,
	.readable_reg = tegra210_i2s_rd_reg,
	.volatile_reg = tegra210_i2s_volatile_reg,
	.cache_type = REGCACHE_RBTREE,
};

static const struct tegra210_i2s_soc_data soc_data_tegra210 = {
	.set_audio_cif = tegra210_xbar_set_cif,
};

static const struct of_device_id tegra210_i2s_of_match[] = {
	{ .compatible = "nvidia,tegra210-i2s", .data = &soc_data_tegra210 },
	{},
};

static int tegra210_i2s_platform_probe(struct platform_device *pdev)
{
	struct tegra210_i2s *i2s;
	struct resource *mem, *memregion;
	void __iomem *regs;
	int ret = 0;
	const struct of_device_id *match;
	struct tegra210_i2s_soc_data *soc_data;

	match = of_match_device(tegra210_i2s_of_match, &pdev->dev);
	if (!match) {
		dev_err(&pdev->dev, "Error: No device match found\n");
		ret = -ENODEV;
		goto err;
	}
	soc_data = (struct tegra210_i2s_soc_data *)match->data;

	i2s = devm_kzalloc(&pdev->dev, sizeof(struct tegra210_i2s), GFP_KERNEL);
	if (!i2s) {
		dev_err(&pdev->dev, "Can't allocate i2s\n");
		ret = -ENOMEM;
		goto err;
	}
	dev_set_drvdata(&pdev->dev, i2s);

	i2s->soc_data = soc_data;

	/* initialize srate with default sampling rate */
	i2s->srate = 48000;

	i2s->clk_i2s = devm_clk_get(&pdev->dev, NULL);
	if (IS_ERR(i2s->clk_i2s)) {
		dev_err(&pdev->dev, "Can't retrieve i2s clock\n");
		ret = PTR_ERR(i2s->clk_i2s);
		goto err;
	}

	i2s->clk_i2s_sync = devm_clk_get(&pdev->dev, "ext_audio_sync");
	if (IS_ERR(i2s->clk_i2s_sync)) {
		dev_err(&pdev->dev, "Can't retrieve i2s_sync clock\n");
		ret = PTR_ERR(i2s->clk_i2s_sync);
		goto err_clk_put;
	}

	i2s->clk_pll_a_out0 = clk_get_sys(NULL, "pll_a_out0");
	if (IS_ERR(i2s->clk_pll_a_out0)) {
		dev_err(&pdev->dev, "Can't retrieve pll_a_out0 clock\n");
		ret = PTR_ERR(i2s->clk_pll_a_out0);
		goto err_i2s_sync_clk_put;
	}

	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!mem) {
		dev_err(&pdev->dev, "No memory resource\n");
		ret = -ENODEV;
		goto err_pll_a_out0_clk_put;
	}

	memregion = devm_request_mem_region(&pdev->dev, mem->start,
					    resource_size(mem), pdev->name);
	if (!memregion) {
		dev_err(&pdev->dev, "Memory region already claimed\n");
		ret = -EBUSY;
		goto err_pll_a_out0_clk_put;
	}

	regs = devm_ioremap(&pdev->dev, mem->start, resource_size(mem));
	if (!regs) {
		dev_err(&pdev->dev, "ioremap failed\n");
		ret = -ENOMEM;
		goto err_pll_a_out0_clk_put;
	}

	i2s->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
					    &tegra210_i2s_regmap_config);
	if (IS_ERR(i2s->regmap)) {
		dev_err(&pdev->dev, "regmap init failed\n");
		ret = PTR_ERR(i2s->regmap);
		goto err_pll_a_out0_clk_put;
	}
	regcache_cache_only(i2s->regmap, true);

	if (of_property_read_u32(pdev->dev.of_node,
				"nvidia,ahub-i2s-id",
				&pdev->dev.id) < 0) {
		dev_err(&pdev->dev,
			"Missing property nvidia,ahub-i2s-id\n");
		ret = -ENODEV;
		goto err_pll_a_out0_clk_put;
	}

	i2s->pinctrl = devm_pinctrl_get(&pdev->dev);
	if (IS_ERR(i2s->pinctrl)) {
		dev_warn(&pdev->dev, "Missing pinctrl device\n");
		goto err_dap;
	}

	i2s->pin_default_state = pinctrl_lookup_state(i2s->pinctrl,
								"dap_active");
	if (IS_ERR(i2s->pin_default_state)) {
		dev_warn(&pdev->dev, "Missing dap-active state\n");
		goto err_dap;
	}

	i2s->pin_idle_state = pinctrl_lookup_state(i2s->pinctrl,
							"dap_inactive");
	if (IS_ERR(i2s->pin_idle_state)) {
		dev_warn(&pdev->dev, "Missing dap-inactive state\n");
		goto err_dap;
	}

	ret = pinctrl_select_state(i2s->pinctrl, i2s->pin_idle_state);
	if (ret < 0) {
		dev_err(&pdev->dev, "setting state failed\n");
		goto err_dap;
	}

err_dap:
	pm_runtime_enable(&pdev->dev);
	if (!pm_runtime_enabled(&pdev->dev)) {
		ret = tegra210_i2s_runtime_resume(&pdev->dev);
		if (ret)
			goto err_pm_disable;
	}

	ret = snd_soc_register_codec(&pdev->dev, &tegra210_i2s_codec,
				     tegra210_i2s_dais,
				     ARRAY_SIZE(tegra210_i2s_dais));
	if (ret != 0) {
		dev_err(&pdev->dev, "Could not register CODEC: %d\n", ret);
		goto err_suspend;
	}

	return 0;

err_suspend:
	if (!pm_runtime_status_suspended(&pdev->dev))
		tegra210_i2s_runtime_suspend(&pdev->dev);
err_pm_disable:
	pm_runtime_disable(&pdev->dev);
err_pll_a_out0_clk_put:
	clk_put(i2s->clk_pll_a_out0);
err_i2s_sync_clk_put:
	devm_clk_put(&pdev->dev, i2s->clk_i2s_sync);
err_clk_put:
	devm_clk_put(&pdev->dev, i2s->clk_i2s);
err:
	return ret;
}

static int tegra210_i2s_platform_remove(struct platform_device *pdev)
{
	struct tegra210_i2s *i2s = dev_get_drvdata(&pdev->dev);

	snd_soc_unregister_codec(&pdev->dev);

	pm_runtime_disable(&pdev->dev);
	if (!pm_runtime_status_suspended(&pdev->dev))
		tegra210_i2s_runtime_suspend(&pdev->dev);

	devm_clk_put(&pdev->dev, i2s->clk_i2s);
	devm_clk_put(&pdev->dev, i2s->clk_i2s_sync);
	clk_put(i2s->clk_pll_a_out0);

	return 0;
}

static const struct dev_pm_ops tegra210_i2s_pm_ops = {
	SET_RUNTIME_PM_OPS(tegra210_i2s_runtime_suspend,
			   tegra210_i2s_runtime_resume, NULL)
};

static struct platform_driver tegra210_i2s_driver = {
	.driver = {
		.name = DRV_NAME,
		.owner = THIS_MODULE,
		.of_match_table = tegra210_i2s_of_match,
		.pm = &tegra210_i2s_pm_ops,
	},
	.probe = tegra210_i2s_platform_probe,
	.remove = tegra210_i2s_platform_remove,
};
module_platform_driver(tegra210_i2s_driver)

MODULE_AUTHOR("Songhee Baek <sbaek@nvidia.com>");
MODULE_DESCRIPTION("Tegra210 I2S ASoC driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRV_NAME);
MODULE_DEVICE_TABLE(of, tegra210_i2s_of_match);