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Commit d4a2eca7 authored by Stephen Warren's avatar Stephen Warren Committed by Mark Brown
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ASoC: Tegra I2S: Remove dependency on pdev->id 



When devices are instantiated from device-tree, pdev->id is set to -1.
Rework the driver so it doesn't depend on the ID.

Tegra I2S instantiated from board files are configured with pdev
name "tegra-i2s" and ID 0 or 1. The driver core then names the
device "tegra-i2s.0" or "tegra-i2s.1". This is not changing.

When a device is instantiated from device-tree, it will have
pdev->name="" and pdev->id=-1. For this reason, the pdev->id value is
not something we can rely on.

This patch doesn't actually change any names though:

When a device is instantiated from device-tree, the overall device name
will be "${unit_address}.${node_name}". This causes issues such as
clk_get() failures due to lack of a device-name match. To solve that,
AUXDATA was invented, to force a specific device name, thus allowing
dev_name() to return the same as the non-device-tree case. Tegra
currently uses AUXDATA for the I2S controllers. Eventually, AUXDATA will
go away, most likely replaced by phandle-based references within the
device tree.

Signed-off-by: default avatarStephen Warren <swarren@nvidia.com>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent 16c88583

sound/soc/tegra/tegra_i2s.c

+23 −49
Original line number Diff line number Diff line
@@ -98,13 +98,11 @@ static const struct file_operations tegra_i2s_debug_fops = { 
	.release = single_release,

};



static void tegra_i2s_debug_add(struct tegra_i2s *i2s, int id)

static void tegra_i2s_debug_add(struct tegra_i2s *i2s)

{

	char name[] = DRV_NAME ".0";



	snprintf(name, sizeof(name), DRV_NAME".%1d", id);

	i2s->debug = debugfs_create_file(name, S_IRUGO, snd_soc_debugfs_root,

						i2s, &tegra_i2s_debug_fops);

	i2s->debug = debugfs_create_file(i2s->dai.name, S_IRUGO,

					 snd_soc_debugfs_root, i2s,

					 &tegra_i2s_debug_fops);

}



static void tegra_i2s_debug_remove(struct tegra_i2s *i2s)
@@ -311,27 +309,7 @@ static const struct snd_soc_dai_ops tegra_i2s_dai_ops = { 
	.trigger	= tegra_i2s_trigger,

};



static struct snd_soc_dai_driver tegra_i2s_dai[] = {

	{

		.name = DRV_NAME ".0",

		.probe = tegra_i2s_probe,

		.playback = {

			.channels_min = 2,

			.channels_max = 2,

			.rates = SNDRV_PCM_RATE_8000_96000,

			.formats = SNDRV_PCM_FMTBIT_S16_LE,

		},

		.capture = {

			.channels_min = 2,

			.channels_max = 2,

			.rates = SNDRV_PCM_RATE_8000_96000,

			.formats = SNDRV_PCM_FMTBIT_S16_LE,

		},

		.ops = &tegra_i2s_dai_ops,

		.symmetric_rates = 1,

	},

	{

		.name = DRV_NAME ".1",

static const struct snd_soc_dai_driver tegra_i2s_dai_template = {

	.probe = tegra_i2s_probe,

	.playback = {

		.channels_min = 2,
@@ -347,7 +325,6 @@ static struct snd_soc_dai_driver tegra_i2s_dai[] = { 
	},

	.ops = &tegra_i2s_dai_ops,

	.symmetric_rates = 1,

	},

};



static __devinit int tegra_i2s_platform_probe(struct platform_device *pdev)
@@ -356,12 +333,6 @@ static __devinit int tegra_i2s_platform_probe(struct platform_device *pdev) 
	struct resource *mem, *memregion, *dmareq;

	int ret;



	if ((pdev->id < 0) ||

		(pdev->id >= ARRAY_SIZE(tegra_i2s_dai))) {

		dev_err(&pdev->dev, "ID %d out of range\n", pdev->id);

		return -EINVAL;

	}



	i2s = devm_kzalloc(&pdev->dev, sizeof(struct tegra_i2s), GFP_KERNEL);

	if (!i2s) {

		dev_err(&pdev->dev, "Can't allocate tegra_i2s\n");
@@ -370,6 +341,9 @@ static __devinit int tegra_i2s_platform_probe(struct platform_device *pdev) 
	}

	dev_set_drvdata(&pdev->dev, i2s);



	i2s->dai = tegra_i2s_dai_template;

	i2s->dai.name = dev_name(&pdev->dev);



	i2s->clk_i2s = clk_get(&pdev->dev, NULL);

	if (IS_ERR(i2s->clk_i2s)) {

		dev_err(&pdev->dev, "Can't retrieve i2s clock\n");
@@ -418,14 +392,14 @@ static __devinit int tegra_i2s_platform_probe(struct platform_device *pdev) 


	i2s->reg_ctrl = TEGRA_I2S_CTRL_FIFO_FORMAT_PACKED;



	ret = snd_soc_register_dai(&pdev->dev, &tegra_i2s_dai[pdev->id]);

	ret = snd_soc_register_dai(&pdev->dev, &i2s->dai);

	if (ret) {

		dev_err(&pdev->dev, "Could not register DAI: %d\n", ret);

		ret = -ENOMEM;

		goto err_clk_put;

	}



	tegra_i2s_debug_add(i2s, pdev->id);

	tegra_i2s_debug_add(i2s);



	return 0;

sound/soc/tegra/tegra_i2s.h

+1 −0
Original line number Diff line number Diff line
@@ -153,6 +153,7 @@ 
#define TEGRA_I2S_FIFO_SCR_FIFO1_ATN_LVL_TWELVE_SLOTS	(TEGRA_I2S_FIFO_ATN_LVL_TWELVE_SLOTS << TEGRA_I2S_FIFO_SCR_FIFO1_ATN_LVL_SHIFT)



struct tegra_i2s {

	struct snd_soc_dai_driver dai;

	struct clk *clk_i2s;

	int clk_refs;

	struct tegra_pcm_dma_params capture_dma_data;