ASoC: tegra: tegra20_das: Get rid of global pointer for driver data

This enables the driver (at least theoretically) to bind to more than one
device.

The remove function has nothing to do now, so it is dropped.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20220629194224.175607-3-u.kleine-koenig@pengutronix.deSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/tegra/tegra20_das.c

@@ -97,14 +97,12 @@ struct tegra20_das {
  * configuration is programmed.
  */
 
-static struct tegra20_das *das;
-
-static inline void tegra20_das_write(u32 reg, u32 val)
+static inline void tegra20_das_write(struct tegra20_das *das, u32 reg, u32 val)
 {
 	regmap_write(das->regmap, reg, val);
 }
 
-static int tegra20_das_connect_dap_to_dac(int dap, int dac)
+static int tegra20_das_connect_dap_to_dac(struct tegra20_das *das, int dap, int dac)
 {
 	u32 addr;
 	u32 reg;
@@ -116,12 +114,12 @@ static int tegra20_das_connect_dap_to_dac(int dap, int dac)
 		(dap * TEGRA20_DAS_DAP_CTRL_SEL_STRIDE);
 	reg = dac << TEGRA20_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_P;
 
-	tegra20_das_write(addr, reg);
+	tegra20_das_write(das, addr, reg);
 
 	return 0;
 }
 
-static int tegra20_das_connect_dac_to_dap(int dac, int dap)
+static int tegra20_das_connect_dac_to_dap(struct tegra20_das *das, int dac, int dap)
 {
 	u32 addr;
 	u32 reg;
@@ -135,7 +133,7 @@ static int tegra20_das_connect_dac_to_dap(int dac, int dap)
 		dap << TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA1_SEL_P |
 		dap << TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA2_SEL_P;
 
-	tegra20_das_write(addr, reg);
+	tegra20_das_write(das, addr, reg);
 
 	return 0;
 }
@@ -168,74 +166,51 @@ static const struct regmap_config tegra20_das_regmap_config = {
 static int tegra20_das_probe(struct platform_device *pdev)
 {
 	void __iomem *regs;
+	struct tegra20_das *das;
 	int ret = 0;
 
-	if (das)
-		return -ENODEV;
-
 	das = devm_kzalloc(&pdev->dev, sizeof(struct tegra20_das), GFP_KERNEL);
-	if (!das) {
-		ret = -ENOMEM;
-		goto err;
-	}
+	if (!das)
+		return -ENOMEM;
+
 	das->dev = &pdev->dev;
 
 	regs = devm_platform_ioremap_resource(pdev, 0);
-	if (IS_ERR(regs)) {
-		ret = PTR_ERR(regs);
-		goto err;
-	}
+	if (IS_ERR(regs))
+		return PTR_ERR(regs);
 
 	das->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
 					    &tegra20_das_regmap_config);
 	if (IS_ERR(das->regmap)) {
 		dev_err(&pdev->dev, "regmap init failed\n");
-		ret = PTR_ERR(das->regmap);
-		goto err;
+		return PTR_ERR(das->regmap);
 	}
 
-	ret = tegra20_das_connect_dap_to_dac(TEGRA20_DAS_DAP_ID_1,
+	ret = tegra20_das_connect_dap_to_dac(das, TEGRA20_DAS_DAP_ID_1,
 					     TEGRA20_DAS_DAP_SEL_DAC1);
 	if (ret) {
 		dev_err(&pdev->dev, "Can't set up DAS DAP connection\n");
-		goto err;
+		return ret;
 	}
-	ret = tegra20_das_connect_dac_to_dap(TEGRA20_DAS_DAC_ID_1,
+	ret = tegra20_das_connect_dac_to_dap(das, TEGRA20_DAS_DAC_ID_1,
 					     TEGRA20_DAS_DAC_SEL_DAP1);
 	if (ret) {
 		dev_err(&pdev->dev, "Can't set up DAS DAC connection\n");
-		goto err;
+		return ret;
 	}
-
-	ret = tegra20_das_connect_dap_to_dac(TEGRA20_DAS_DAP_ID_3,
+	ret = tegra20_das_connect_dap_to_dac(das, TEGRA20_DAS_DAP_ID_3,
 					     TEGRA20_DAS_DAP_SEL_DAC3);
 	if (ret) {
 		dev_err(&pdev->dev, "Can't set up DAS DAP connection\n");
-		goto err;
+		return ret;
 	}
-	ret = tegra20_das_connect_dac_to_dap(TEGRA20_DAS_DAC_ID_3,
+	ret = tegra20_das_connect_dac_to_dap(das, TEGRA20_DAS_DAC_ID_3,
 					     TEGRA20_DAS_DAC_SEL_DAP3);
 	if (ret) {
 		dev_err(&pdev->dev, "Can't set up DAS DAC connection\n");
-		goto err;
+		return ret;
 	}
 
-	platform_set_drvdata(pdev, das);
-
-	return 0;
-
-err:
-	das = NULL;
-	return ret;
-}
-
-static int tegra20_das_remove(struct platform_device *pdev)
-{
-	if (!das)
-		return -ENODEV;
-
-	das = NULL;
-
 	return 0;
 }
 
@@ -246,7 +221,6 @@ static const struct of_device_id tegra20_das_of_match[] = {
 
 static struct platform_driver tegra20_das_driver = {
 	.probe = tegra20_das_probe,
-	.remove = tegra20_das_remove,
 	.driver = {
 		.name = DRV_NAME,
 		.of_match_table = tegra20_das_of_match,