AM5708: Linux: McASP5 audio not working

/*
 * ASoC simple sound card support
 *
 * Copyright (C) 2012 Renesas Solutions Corp.
 * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/clk.h>
#include <linux/device.h>
#include <linux/gpio.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/platform_device.h>
#include <linux/string.h>
#include <sound/jack.h>
#include <sound/simple_card.h>
#include <sound/soc-dai.h>
#include <sound/soc.h>

struct asoc_simple_jack {
	struct snd_soc_jack jack;
	struct snd_soc_jack_pin pin;
	struct snd_soc_jack_gpio gpio;
};

struct simple_card_data {
	struct snd_soc_card snd_card;
	struct simple_dai_props {
		struct asoc_simple_dai cpu_dai;
		struct asoc_simple_dai codec_dai;
		unsigned int mclk_fs;
	} *dai_props;
	unsigned int mclk_fs;
	struct asoc_simple_jack hp_jack;
	struct asoc_simple_jack mic_jack;
	struct snd_soc_dai_link *dai_link;
};

#define simple_priv_to_card(priv) (&(priv)->snd_card)
#define simple_priv_to_props(priv, i) ((priv)->dai_props + (i))
#define simple_priv_to_dev(priv) (simple_priv_to_card(priv)->dev)
#define simple_priv_to_link(priv, i) (simple_priv_to_card(priv)->dai_link + (i))

#define DAI	"sound-dai"
#define CELL	"#sound-dai-cells"
#define PREFIX	"simple-audio-card,"

#define asoc_simple_card_init_hp(card, sjack, prefix)\
	asoc_simple_card_init_jack(card, sjack, 1, prefix)
#define asoc_simple_card_init_mic(card, sjack, prefix)\
	asoc_simple_card_init_jack(card, sjack, 0, prefix)
static int asoc_simple_card_init_jack(struct snd_soc_card *card,
				      struct asoc_simple_jack *sjack,
				      int is_hp, char *prefix)
{
	struct device *dev = card->dev;
	enum of_gpio_flags flags;
	char prop[128];
	char *pin_name;
	char *gpio_name;
	int mask;
	int det;

	sjack->gpio.gpio = -ENOENT;

	if (is_hp) {
		snprintf(prop, sizeof(prop), "%shp-det-gpio", prefix);
		pin_name	= "Headphones";
		gpio_name	= "Headphone detection";
		mask		= SND_JACK_HEADPHONE;
	} else {
		snprintf(prop, sizeof(prop), "%smic-det-gpio", prefix);
		pin_name	= "Mic Jack";
		gpio_name	= "Mic detection";
		mask		= SND_JACK_MICROPHONE;
	}

	det = of_get_named_gpio_flags(dev->of_node, prop, 0, &flags);
	if (det == -EPROBE_DEFER)
		return -EPROBE_DEFER;

	if (gpio_is_valid(det)) {
		sjack->pin.pin		= pin_name;
		sjack->pin.mask		= mask;

		sjack->gpio.name	= gpio_name;
		sjack->gpio.report	= mask;
		sjack->gpio.gpio	= det;
		sjack->gpio.invert	= !!(flags & OF_GPIO_ACTIVE_LOW);
		sjack->gpio.debounce_time = 150;

		snd_soc_card_jack_new(card, pin_name, mask,
				      &sjack->jack,
				      &sjack->pin, 1);

		snd_soc_jack_add_gpios(&sjack->jack, 1,
				       &sjack->gpio);
	}

	return 0;
}

static int asoc_simple_card_startup(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct simple_card_data *priv =	snd_soc_card_get_drvdata(rtd->card);
	struct simple_dai_props *dai_props =
		simple_priv_to_props(priv, rtd->num);
	int ret;

	ret = asoc_simple_card_clk_enable(&dai_props->cpu_dai);
	if (ret)
		return ret;

	ret = asoc_simple_card_clk_enable(&dai_props->codec_dai);
	if (ret)
		asoc_simple_card_clk_disable(&dai_props->cpu_dai);

	return ret;
}

static void asoc_simple_card_shutdown(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct simple_card_data *priv =	snd_soc_card_get_drvdata(rtd->card);
	struct simple_dai_props *dai_props =
		simple_priv_to_props(priv, rtd->num);

	asoc_simple_card_clk_disable(&dai_props->cpu_dai);

	asoc_simple_card_clk_disable(&dai_props->codec_dai);
}

static int asoc_simple_card_hw_params(struct snd_pcm_substream *substream,
				      struct snd_pcm_hw_params *params)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *codec_dai = rtd->codec_dai;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	struct simple_card_data *priv = snd_soc_card_get_drvdata(rtd->card);
	struct simple_dai_props *dai_props =
		simple_priv_to_props(priv, rtd->num);
	unsigned int mclk, mclk_fs = 0;
	int ret = 0;

	if (priv->mclk_fs)
		mclk_fs = priv->mclk_fs;
	else if (dai_props->mclk_fs)
		mclk_fs = dai_props->mclk_fs;

	printk("===>>> mclk fs is %d params rate is %d\n", mclk_fs, params_rate(params));
	if (mclk_fs) {
		mclk = params_rate(params) * mclk_fs;
		ret = snd_soc_dai_set_sysclk(codec_dai, 0, mclk,
					     SND_SOC_CLOCK_IN);
		if (ret && ret != -ENOTSUPP)
			goto err;

		ret = snd_soc_dai_set_sysclk(cpu_dai, 0, mclk,
					     SND_SOC_CLOCK_OUT);
		if (ret && ret != -ENOTSUPP)
			goto err;
	}
	return 0;
err:
	return ret;
}

static const struct snd_soc_ops asoc_simple_card_ops = {
	.startup = asoc_simple_card_startup,
	.shutdown = asoc_simple_card_shutdown,
	.hw_params = asoc_simple_card_hw_params,
};

static int asoc_simple_card_dai_init(struct snd_soc_pcm_runtime *rtd)
{
	struct simple_card_data *priv =	snd_soc_card_get_drvdata(rtd->card);
	struct snd_soc_dai *codec = rtd->codec_dai;
	struct snd_soc_dai *cpu = rtd->cpu_dai;
	struct simple_dai_props *dai_props =
		simple_priv_to_props(priv, rtd->num);
	int ret;

	ret = asoc_simple_card_init_dai(codec, &dai_props->codec_dai);
	if (ret < 0)
		return ret;

	ret = asoc_simple_card_init_dai(cpu, &dai_props->cpu_dai);
	if (ret < 0)
		return ret;

	ret = asoc_simple_card_init_hp(rtd->card, &priv->hp_jack, PREFIX);
	if (ret < 0)
		return ret;

	ret = asoc_simple_card_init_mic(rtd->card, &priv->mic_jack, PREFIX);
	if (ret < 0)
		return ret;

	return 0;
}

static int asoc_simple_card_dai_link_of(struct device_node *node,
					struct simple_card_data *priv,
					int idx,
					bool is_top_level_node)
{
	struct device *dev = simple_priv_to_dev(priv);
	struct snd_soc_dai_link *dai_link = simple_priv_to_link(priv, idx);
	struct simple_dai_props *dai_props = simple_priv_to_props(priv, idx);
	struct asoc_simple_dai *cpu_dai = &dai_props->cpu_dai;
	struct asoc_simple_dai *codec_dai = &dai_props->codec_dai;
	struct device_node *cpu = NULL;
	struct device_node *plat = NULL;
	struct device_node *codec = NULL;
	char prop[128];
	char *prefix = "";
	int ret, single_cpu;

	/* For single DAI link & old style of DT node */
	if (is_top_level_node)
		prefix = PREFIX;

	snprintf(prop, sizeof(prop), "%scpu", prefix);
	cpu = of_get_child_by_name(node, prop);

	if (!cpu) {
		ret = -EINVAL;
		dev_err(dev, "%s: Can't find %s DT node\n", __func__, prop);
		goto dai_link_of_err;
	}

	snprintf(prop, sizeof(prop), "%splat", prefix);
	plat = of_get_child_by_name(node, prop);

	snprintf(prop, sizeof(prop), "%scodec", prefix);
	codec = of_get_child_by_name(node, prop);

	if (!codec) {
		ret = -EINVAL;
		dev_err(dev, "%s: Can't find %s DT node\n", __func__, prop);
		goto dai_link_of_err;
	}

	ret = asoc_simple_card_parse_daifmt(dev, node, codec,
					    prefix, &dai_link->dai_fmt);
	if (ret < 0)
		goto dai_link_of_err;

	of_property_read_u32(node, "mclk-fs", &dai_props->mclk_fs);

	ret = asoc_simple_card_parse_cpu(cpu, dai_link,
					 DAI, CELL, &single_cpu);
	if (ret < 0)
		goto dai_link_of_err;

	ret = asoc_simple_card_parse_codec(codec, dai_link, DAI, CELL);
	if (ret < 0)
		goto dai_link_of_err;

	ret = asoc_simple_card_parse_platform(plat, dai_link, DAI, CELL);
	if (ret < 0)
		goto dai_link_of_err;

	ret = asoc_simple_card_of_parse_tdm(cpu, cpu_dai);
	if (ret < 0)
		goto dai_link_of_err;

	ret = asoc_simple_card_of_parse_tdm(codec, codec_dai);
	if (ret < 0)
		goto dai_link_of_err;

	ret = asoc_simple_card_parse_clk_cpu(dev, cpu, dai_link, cpu_dai);
	if (ret < 0)
		goto dai_link_of_err;

	ret = asoc_simple_card_parse_clk_codec(dev, codec, dai_link, codec_dai);
	if (ret < 0)
		goto dai_link_of_err;

	ret = asoc_simple_card_canonicalize_dailink(dai_link);
	if (ret < 0)
		goto dai_link_of_err;

	ret = asoc_simple_card_set_dailink_name(dev, dai_link,
						"%s-%s",
						dai_link->cpu_dai_name,
						dai_link->codec_dai_name);
	if (ret < 0)
		goto dai_link_of_err;

	dai_link->ops = &asoc_simple_card_ops;
	dai_link->init = asoc_simple_card_dai_init;

	asoc_simple_card_canonicalize_cpu(dai_link, single_cpu);

dai_link_of_err:
	of_node_put(cpu);
	of_node_put(codec);

	return ret;
}

static int asoc_simple_card_parse_aux_devs(struct device_node *node,
					   struct simple_card_data *priv)
{
	struct device *dev = simple_priv_to_dev(priv);
	struct device_node *aux_node;
	struct snd_soc_card *card = simple_priv_to_card(priv);
	int i, n, len;

	if (!of_find_property(node, PREFIX "aux-devs", &len))
		return 0;		/* Ok to have no aux-devs */

	n = len / sizeof(__be32);
	if (n <= 0)
		return -EINVAL;

	card->aux_dev = devm_kzalloc(dev,
			n * sizeof(*card->aux_dev), GFP_KERNEL);
	if (!card->aux_dev)
		return -ENOMEM;

	for (i = 0; i < n; i++) {
		aux_node = of_parse_phandle(node, PREFIX "aux-devs", i);
		if (!aux_node)
			return -EINVAL;
		card->aux_dev[i].codec_of_node = aux_node;
	}

	card->num_aux_devs = n;
	return 0;
}

static int asoc_simple_card_parse_of(struct simple_card_data *priv)
{
	struct device *dev = simple_priv_to_dev(priv);
	struct snd_soc_card *card = simple_priv_to_card(priv);
	struct device_node *dai_link;
	struct device_node *node = dev->of_node;
	int ret;

	if (!node)
		return -EINVAL;

	dai_link = of_get_child_by_name(node, PREFIX "dai-link");

	ret = asoc_simple_card_of_parse_widgets(card, PREFIX);
	if (ret < 0)
		goto card_parse_end;

	ret = asoc_simple_card_of_parse_routing(card, PREFIX, 1);
	if (ret < 0)
		goto card_parse_end;

	/* Factor to mclk, used in hw_params() */
	of_property_read_u32(node, PREFIX "mclk-fs", &priv->mclk_fs);

	/* Single/Muti DAI link(s) & New style of DT node */
	if (dai_link) {
		struct device_node *np = NULL;
		int i = 0;

		for_each_child_of_node(node, np) {
			dev_dbg(dev, "\tlink %d:\n", i);
			ret = asoc_simple_card_dai_link_of(np, priv,
							   i, false);
			if (ret < 0) {
				of_node_put(np);
				goto card_parse_end;
			}
			i++;
		}
	} else {
		/* For single DAI link & old style of DT node */
		ret = asoc_simple_card_dai_link_of(node, priv, 0, true);
		if (ret < 0)
			goto card_parse_end;
	}

	ret = asoc_simple_card_parse_card_name(card, PREFIX);
	if (ret < 0)
		goto card_parse_end;

	ret = asoc_simple_card_parse_aux_devs(node, priv);

card_parse_end:
	of_node_put(dai_link);

	return ret;
}

static int asoc_simple_card_probe(struct platform_device *pdev)
{
	struct simple_card_data *priv;
	struct snd_soc_dai_link *dai_link;
	struct simple_dai_props *dai_props;
	struct device *dev = &pdev->dev;
	struct device_node *np = dev->of_node;
	struct snd_soc_card *card;
	int num, ret;

	/* Get the number of DAI links */
	if (np && of_get_child_by_name(np, PREFIX "dai-link"))
		num = of_get_child_count(np);
	else
		num = 1;

	/* Allocate the private data and the DAI link array */
	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	dai_props = devm_kzalloc(dev, sizeof(*dai_props) * num, GFP_KERNEL);
	dai_link  = devm_kzalloc(dev, sizeof(*dai_link)  * num, GFP_KERNEL);
	if (!dai_props || !dai_link)
		return -ENOMEM;

	priv->dai_props			= dai_props;
	priv->dai_link			= dai_link;

	/* Init snd_soc_card */
	card = simple_priv_to_card(priv);
	card->owner		= THIS_MODULE;
	card->dev		= dev;
	card->dai_link		= priv->dai_link;
	card->num_links		= num;

	if (np && of_device_is_available(np)) {

		ret = asoc_simple_card_parse_of(priv);
		if (ret < 0) {
			if (ret != -EPROBE_DEFER)
				dev_err(dev, "parse error %d\n", ret);
			goto err;
		}

	} else {
		struct asoc_simple_card_info *cinfo;

		cinfo = dev->platform_data;
		if (!cinfo) {
			dev_err(dev, "no info for asoc-simple-card\n");
			return -EINVAL;
		}

		if (!cinfo->name ||
		    !cinfo->codec_dai.name ||
		    !cinfo->codec ||
		    !cinfo->platform ||
		    !cinfo->cpu_dai.name) {
			dev_err(dev, "insufficient asoc_simple_card_info settings\n");
			return -EINVAL;
		}

		card->name		= (cinfo->card) ? cinfo->card : cinfo->name;
		dai_link->name		= cinfo->name;
		dai_link->stream_name	= cinfo->name;
		dai_link->platform_name	= cinfo->platform;
		dai_link->codec_name	= cinfo->codec;
		dai_link->cpu_dai_name	= cinfo->cpu_dai.name;
		dai_link->codec_dai_name = cinfo->codec_dai.name;
		dai_link->dai_fmt	= cinfo->daifmt;
		dai_link->init		= asoc_simple_card_dai_init;
		memcpy(&priv->dai_props->cpu_dai, &cinfo->cpu_dai,
					sizeof(priv->dai_props->cpu_dai));
		memcpy(&priv->dai_props->codec_dai, &cinfo->codec_dai,
					sizeof(priv->dai_props->codec_dai));
	}

	snd_soc_card_set_drvdata(card, priv);

	ret = devm_snd_soc_register_card(dev, card);
	if (ret < 0)
		goto err;

	return 0;
err:
	asoc_simple_card_clean_reference(card);

	return ret;
}

static int asoc_simple_card_remove(struct platform_device *pdev)
{
	struct snd_soc_card *card = platform_get_drvdata(pdev);

	return asoc_simple_card_clean_reference(card);
}

static const struct of_device_id asoc_simple_of_match[] = {
	{ .compatible = "simple-audio-card", },
	{},
};
MODULE_DEVICE_TABLE(of, asoc_simple_of_match);

static struct platform_driver asoc_simple_card = {
	.driver = {
		.name = "asoc-simple-card",
		.pm = &snd_soc_pm_ops,
		.of_match_table = asoc_simple_of_match,
	},
	.probe = asoc_simple_card_probe,
	.remove = asoc_simple_card_remove,
};

module_platform_driver(asoc_simple_card);

MODULE_ALIAS("platform:asoc-simple-card");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("ASoC Simple Sound Card");
MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");

/*
 * simple-card-utils.c
 *
 * Copyright (c) 2016 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_graph.h>
#include <sound/simple_card_utils.h>

void asoc_simple_card_convert_fixup(struct asoc_simple_card_data *data,
				    struct snd_pcm_hw_params *params)
{
	struct snd_interval *rate = hw_param_interval(params,
						SNDRV_PCM_HW_PARAM_RATE);
	struct snd_interval *channels = hw_param_interval(params,
						SNDRV_PCM_HW_PARAM_CHANNELS);

	if (data->convert_rate)
		rate->min =
		rate->max = data->convert_rate;

	if (data->convert_channels)
		channels->min =
		channels->max = data->convert_channels;
}
EXPORT_SYMBOL_GPL(asoc_simple_card_convert_fixup);

void asoc_simple_card_parse_convert(struct device *dev, char *prefix,
				    struct asoc_simple_card_data *data)
{
	struct device_node *np = dev->of_node;
	char prop[128];

	if (!prefix)
		prefix = "";

	/* sampling rate convert */
	snprintf(prop, sizeof(prop), "%s%s", prefix, "convert-rate");
	of_property_read_u32(np, prop, &data->convert_rate);

	/* channels transfer */
	snprintf(prop, sizeof(prop), "%s%s", prefix, "convert-channels");
	of_property_read_u32(np, prop, &data->convert_channels);

	dev_dbg(dev, "convert_rate     %d\n", data->convert_rate);
	dev_dbg(dev, "convert_channels %d\n", data->convert_channels);
}
EXPORT_SYMBOL_GPL(asoc_simple_card_parse_convert);

int asoc_simple_card_parse_daifmt(struct device *dev,
				  struct device_node *node,
				  struct device_node *codec,
				  char *prefix,
				  unsigned int *retfmt)
{
	struct device_node *bitclkmaster = NULL;
	struct device_node *framemaster = NULL;
	unsigned int daifmt;

	daifmt = snd_soc_of_parse_daifmt(node, prefix,
					 &bitclkmaster, &framemaster);
	daifmt &= ~SND_SOC_DAIFMT_MASTER_MASK;

	if (!bitclkmaster && !framemaster) {
		/*
		 * No dai-link level and master setting was not found from
		 * sound node level, revert back to legacy DT parsing and
		 * take the settings from codec node.
		 */
		dev_dbg(dev, "Revert to legacy daifmt parsing\n");

		daifmt = snd_soc_of_parse_daifmt(codec, NULL, NULL, NULL) |
			(daifmt & ~SND_SOC_DAIFMT_CLOCK_MASK);
	} else {
		if (codec == bitclkmaster)
			daifmt |= (codec == framemaster) ?
				SND_SOC_DAIFMT_CBM_CFM : SND_SOC_DAIFMT_CBM_CFS;
		else
			daifmt |= (codec == framemaster) ?
				SND_SOC_DAIFMT_CBS_CFM : SND_SOC_DAIFMT_CBS_CFS;
	}

	of_node_put(bitclkmaster);
	of_node_put(framemaster);

	*retfmt = daifmt;

	dev_dbg(dev, "format : %04x\n", daifmt);

	return 0;
}
EXPORT_SYMBOL_GPL(asoc_simple_card_parse_daifmt);

int asoc_simple_card_set_dailink_name(struct device *dev,
				      struct snd_soc_dai_link *dai_link,
				      const char *fmt, ...)
{
	va_list ap;
	char *name = NULL;
	int ret = -ENOMEM;

	va_start(ap, fmt);
	name = devm_kvasprintf(dev, GFP_KERNEL, fmt, ap);
	va_end(ap);

	if (name) {
		ret = 0;

		dai_link->name		= name;
		dai_link->stream_name	= name;

		dev_dbg(dev, "name : %s\n", name);
	}

	return ret;
}
EXPORT_SYMBOL_GPL(asoc_simple_card_set_dailink_name);

int asoc_simple_card_parse_card_name(struct snd_soc_card *card,
				     char *prefix)
{
	int ret;

	if (!prefix)
		prefix = "";

	/* Parse the card name from DT */
	ret = snd_soc_of_parse_card_name(card, "label");
	if (ret < 0 || !card->name) {
		char prop[128];

		snprintf(prop, sizeof(prop), "%sname", prefix);
		ret = snd_soc_of_parse_card_name(card, prop);
		if (ret < 0)
			return ret;
	}

	if (!card->name && card->dai_link)
		card->name = card->dai_link->name;

	dev_dbg(card->dev, "Card Name: %s\n", card->name ? card->name : "");

	return 0;
}
EXPORT_SYMBOL_GPL(asoc_simple_card_parse_card_name);

static void asoc_simple_card_clk_register(struct asoc_simple_dai *dai,
					  struct clk *clk)
{
	dai->clk = clk;
}

int asoc_simple_card_clk_enable(struct asoc_simple_dai *dai)
{
	return clk_prepare_enable(dai->clk);
}
EXPORT_SYMBOL_GPL(asoc_simple_card_clk_enable);

void asoc_simple_card_clk_disable(struct asoc_simple_dai *dai)
{
	clk_disable_unprepare(dai->clk);
}
EXPORT_SYMBOL_GPL(asoc_simple_card_clk_disable);

int asoc_simple_card_parse_clk(struct device *dev,
			       struct device_node *node,
			       struct device_node *dai_of_node,
			       struct asoc_simple_dai *simple_dai,
			       const char *name)
{
	struct clk *clk;
	u32 val;

	/*
	 * Parse dai->sysclk come from "clocks = <&xxx>"
	 * (if system has common clock)
	 *  or "system-clock-frequency = <xxx>"
	 *  or device's module clock.
	 */
	clk = devm_get_clk_from_child(dev, node, NULL);
	if (!IS_ERR(clk)) {
		simple_dai->sysclk = clk_get_rate(clk);
		printk("===>>> Clock name is %s\n",__clk_get_name(clk));
		asoc_simple_card_clk_register(simple_dai, clk);
	} else if (!of_property_read_u32(node, "system-clock-frequency", &val)) {
		simple_dai->sysclk = val;
	} else {
		clk = devm_get_clk_from_child(dev, dai_of_node, NULL);
		if (!IS_ERR(clk)) {
			simple_dai->sysclk = clk_get_rate(clk);
			printk("===>>> child: Clock name is %s\n",__clk_get_name(clk));
		}
	}

	if (of_property_read_bool(node, "system-clock-direction-out"))
		simple_dai->clk_direction = SND_SOC_CLOCK_OUT;

	if (!of_property_read_u32(node, "system-clock-id", &val))
		simple_dai->sysclk_id = val;

	dev_dbg(dev, "%s : sysclk-%d-%s = %d\n", name, simple_dai->sysclk_id,
		simple_dai->clk_direction == SND_SOC_CLOCK_IN ? "in" : "out",
		simple_dai->sysclk);

	printk("===>>> %s : sysclk-%d = %d, direction %d\n", name, simple_dai->sysclk_id, simple_dai->sysclk, simple_dai->clk_direction);
	return 0;
}
EXPORT_SYMBOL_GPL(asoc_simple_card_parse_clk);

int asoc_simple_card_parse_dai(struct device_node *node,
				    struct device_node **dai_of_node,
				    const char **dai_name,
				    const char *list_name,
				    const char *cells_name,
				    int *is_single_link)
{
	struct of_phandle_args args;
	int ret;

	if (!node)
		return 0;

	/*
	 * Get node via "sound-dai = <&phandle port>"
	 * it will be used as xxx_of_node on soc_bind_dai_link()
	 */
	ret = of_parse_phandle_with_args(node, list_name, cells_name, 0, &args);
	if (ret)
		return ret;

	/* Get dai->name */
	if (dai_name) {
		ret = snd_soc_of_get_dai_name(node, dai_name);
		if (ret < 0)
			return ret;
	}

	*dai_of_node = args.np;

	if (is_single_link)
		*is_single_link = !args.args_count;

	return 0;
}
EXPORT_SYMBOL_GPL(asoc_simple_card_parse_dai);

static int asoc_simple_card_get_dai_id(struct device_node *ep)
{
	struct device_node *node;
	struct device_node *endpoint;
	int i, id;
	int ret;

	ret = snd_soc_get_dai_id(ep);
	if (ret != -ENOTSUPP)
		return ret;

	node = of_graph_get_port_parent(ep);

	/*
	 * Non HDMI sound case, counting port/endpoint on its DT
	 * is enough. Let's count it.
	 */
	i = 0;
	id = -1;
	for_each_endpoint_of_node(node, endpoint) {
		if (endpoint == ep)
			id = i;
		i++;
	}

	of_node_put(node);

	if (id < 0)
		return -ENODEV;

	return id;
}

int asoc_simple_card_parse_graph_dai(struct device_node *ep,
				     struct device_node **dai_of_node,
				     const char **dai_name)
{
	struct device_node *node;
	struct of_phandle_args args;
	int ret;

	if (!ep)
		return 0;
	if (!dai_name)
		return 0;

	node = of_graph_get_port_parent(ep);

	/* Get dai->name */
	args.np		= node;
	args.args[0]	= asoc_simple_card_get_dai_id(ep);
	args.args_count	= (of_graph_get_endpoint_count(node) > 1);

	ret = snd_soc_get_dai_name(&args, dai_name);
	if (ret < 0)
		return ret;

	*dai_of_node = node;

	return 0;
}
EXPORT_SYMBOL_GPL(asoc_simple_card_parse_graph_dai);

int asoc_simple_card_init_dai(struct snd_soc_dai *dai,
			      struct asoc_simple_dai *simple_dai)
{
	int ret;

	if (simple_dai->sysclk) {
		ret = snd_soc_dai_set_sysclk(dai, simple_dai->sysclk_id,
					     simple_dai->sysclk,
					     simple_dai->clk_direction);
		if (ret && ret != -ENOTSUPP) {
			dev_err(dai->dev, "simple-card: set_sysclk error\n");
			return ret;
		}
	}

	if (simple_dai->slots) {
		ret = snd_soc_dai_set_tdm_slot(dai,
					       simple_dai->tx_slot_mask,
					       simple_dai->rx_slot_mask,
					       simple_dai->slots,
					       simple_dai->slot_width);
		if (ret && ret != -ENOTSUPP) {
			dev_err(dai->dev, "simple-card: set_tdm_slot error\n");
			return ret;
		}
	}

	return 0;
}
EXPORT_SYMBOL_GPL(asoc_simple_card_init_dai);

int asoc_simple_card_canonicalize_dailink(struct snd_soc_dai_link *dai_link)
{
	/* Assumes platform == cpu */
	if (!dai_link->platform_of_node)
		dai_link->platform_of_node = dai_link->cpu_of_node;

	return 0;
}
EXPORT_SYMBOL_GPL(asoc_simple_card_canonicalize_dailink);

void asoc_simple_card_canonicalize_cpu(struct snd_soc_dai_link *dai_link,
				       int is_single_links)
{
	/*
	 * In soc_bind_dai_link() will check cpu name after
	 * of_node matching if dai_link has cpu_dai_name.
	 * but, it will never match if name was created by
	 * fmt_single_name() remove cpu_dai_name if cpu_args
	 * was 0. See:
	 *	fmt_single_name()
	 *	fmt_multiple_name()
	 */
	if (is_single_links)
		dai_link->cpu_dai_name = NULL;
}
EXPORT_SYMBOL_GPL(asoc_simple_card_canonicalize_cpu);

int asoc_simple_card_clean_reference(struct snd_soc_card *card)
{
	struct snd_soc_dai_link *dai_link;
	int num_links;

	for (num_links = 0, dai_link = card->dai_link;
	     num_links < card->num_links;
	     num_links++, dai_link++) {
		of_node_put(dai_link->cpu_of_node);
		of_node_put(dai_link->codec_of_node);
	}
	return 0;
}
EXPORT_SYMBOL_GPL(asoc_simple_card_clean_reference);

int asoc_simple_card_of_parse_routing(struct snd_soc_card *card,
				      char *prefix,
				      int optional)
{
	struct device_node *node = card->dev->of_node;
	char prop[128];

	if (!prefix)
		prefix = "";

	snprintf(prop, sizeof(prop), "%s%s", prefix, "routing");

	if (!of_property_read_bool(node, prop)) {
		if (optional)
			return 0;
		return -EINVAL;
	}

	return snd_soc_of_parse_audio_routing(card, prop);
}
EXPORT_SYMBOL_GPL(asoc_simple_card_of_parse_routing);

int asoc_simple_card_of_parse_widgets(struct snd_soc_card *card,
				      char *prefix)
{
	struct device_node *node = card->dev->of_node;
	char prop[128];

	if (!prefix)
		prefix = "";

	snprintf(prop, sizeof(prop), "%s%s", prefix, "widgets");

	if (of_property_read_bool(node, prop))
		return snd_soc_of_parse_audio_simple_widgets(card, prop);

	/* no widgets is not error */
	return 0;
}
EXPORT_SYMBOL_GPL(asoc_simple_card_of_parse_widgets);

/* Module information */
MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
MODULE_DESCRIPTION("ALSA SoC Simple Card Utils");
MODULE_LICENSE("GPL v2");