ASoC: tegra-alt: remove Mystique support from DMIC

As part of support to Mystique platform DMIC enable/disable and a callback
helpers were provided (bug 200404157 and bug 200391366). Following commits
were pushed related to this.
 commit b48f5902966a ("ASoC: tegra_alt: add DMIC enable/disable functions")
 commit aac60cf54481 ("tegra-alt: dmic: add start callback support")

This patch removes references to above for following reasons,
 * Mystqiue support is dropped
 * Cleanup is required as part of DMIC upstream work

Bug 200520821
Bug 200503387

Change-Id: I626f65b06fce0d1cec916eb8d4a495d864256f62
Signed-off-by: Sameer Pujar <spujar@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2143613
GVS: Gerrit_Virtual_Submit
Reviewed-by: Mohan Kumar D <mkumard@nvidia.com>
Reviewed-by: Dara Ramesh <dramesh@nvidia.com>
Reviewed-by: Viraj Karandikar <vkarandikar@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

sound/soc/tegra-alt/include/tegra210_dmic_alt.h

@@ -132,11 +132,6 @@ struct tegra210_dmic {
 	bool is_shutdown;
 	int format_out;
 	bool set_parent_rate;
-	void (*start_capture_cb)(void);
 };
 
-/* exported functions to enable DMIC from other driver */
-int tegra210_dmic_enable(int id);
-int tegra210_dmic_disable(int id);
-
 #endif

sound/soc/tegra-alt/tegra210_dmic_alt.c

@@ -40,8 +40,6 @@
 
 #define DRV_NAME "tegra210-dmic"
 
-static struct platform_device *pdev_bkp[5];
-
 static const struct reg_default tegra210_dmic_reg_defaults[] = {
 	{ TEGRA210_DMIC_TX_INT_MASK, 0x00000001},
 	{ TEGRA210_DMIC_TX_CIF_CTRL, 0x00007700},
@@ -118,95 +116,6 @@ static const int tegra210_dmic_fmt_values[] = {
 	TEGRA210_AUDIOCIF_BITS_32,
 };
 
-int tegra210_dmic_enable(int id)
-{
-	struct tegra210_dmic *dmic;
-	struct platform_device *pdev = pdev_bkp[id];
-	int ret = 0;
-	int dmic_clk;
-
-	if (!pdev) {
-		pr_err("No dmic registered for id %d\n", id);
-		return -EINVAL;
-	}
-
-	dmic = dev_get_drvdata(&pdev->dev);
-	if (!dmic)
-		return -EINVAL;
-
-	dmic_clk = (1 << (6 + dmic->osr_val)) * 48000;
-
-	if (dmic->set_parent_rate) {
-		ret = clk_set_rate(dmic->clk_pll_a_out0, dmic_clk);
-		if (ret) {
-			dev_err(&pdev->dev,
-			"Can't set dmic parent clock rate: %d\n", ret);
-			return ret;
-		}
-	}
-
-	ret = clk_set_rate(dmic->clk_dmic, dmic_clk);
-	if (ret) {
-		dev_err(&pdev->dev, "Can't set dmic clock rate: %d\n", ret);
-		return ret;
-	}
-
-	pm_runtime_get_sync(&pdev->dev);
-
-	ret = clk_prepare_enable(dmic->clk_dmic);
-	if (ret) {
-		dev_err(&pdev->dev, "clk_enable failed: %d\n", ret);
-		return ret;
-	}
-
-	regmap_write(dmic->regmap, TEGRA210_DMIC_ENABLE, 1);
-	return ret;
-}
-EXPORT_SYMBOL_GPL(tegra210_dmic_enable);
-
-int tegra210_dmic_disable(int id)
-{
-	struct tegra210_dmic *dmic;
-	struct platform_device *pdev = pdev_bkp[id];
-	int ret = 0;
-
-	if (!pdev) {
-		pr_err("No dmic registered for id %d\n", id);
-		return -EINVAL;
-	}
-
-	dmic = dev_get_drvdata(&pdev->dev);
-	if (!dmic)
-		return -EINVAL;
-
-	clk_disable_unprepare(dmic->clk_dmic);
-
-	regmap_write(dmic->regmap, TEGRA210_DMIC_ENABLE, 0);
-
-	pm_runtime_put(&pdev->dev);
-	return ret;
-}
-EXPORT_SYMBOL_GPL(tegra210_dmic_disable);
-
-int tegra210_dmic_set_start_callback(int id, void (*callback)(void))
-{
-	struct tegra210_dmic *dmic;
-	struct platform_device *pdev = pdev_bkp[id];
-
-	if (!pdev) {
-		pr_err("No dmic registered for id %d\n", id);
-		return -EINVAL;
-	}
-
-	if (!callback)
-		return -EINVAL;
-
-	dmic = dev_get_drvdata(&pdev->dev);
-	dmic->start_capture_cb = callback;
-	return 0;
-}
-EXPORT_SYMBOL_GPL(tegra210_dmic_set_start_callback);
-
 static int tegra210_dmic_startup(struct snd_pcm_substream *substream,
 				 struct snd_soc_dai *dai)
 {
@@ -267,9 +176,6 @@ static int tegra210_dmic_hw_params(struct snd_pcm_substream *substream,
 
 	memset(&cif_conf, 0, sizeof(struct tegra210_xbar_cif_conf));
 
-	if (dmic->start_capture_cb && !strcmp(dai->name, "DAP"))
-		dmic->start_capture_cb();
-
 	srate = params_rate(params);
 	if (dmic->sample_rate_via_control)
 		srate = dmic->sample_rate_via_control;
@@ -813,8 +719,6 @@ static int tegra210_dmic_platform_probe(struct platform_device *pdev)
 	}
 
 err_dap:
-	pdev_bkp[pdev->dev.id] = pdev;
-
 	return 0;
 
 err_suspend: