[PATCH v3 5/8] thermal: exynos: simplify regulator (de)initialization

[Mateusz Majewski <m.majewski2@samsung.com>]

We rewrite the initialization to enable the regulator as part of devm,
which allows us to not handle the struct instance manually. We also
remove the error message in case the regulator is unavailable, as this
is expected behaviour.

Signed-off-by: Mateusz Majewski <m.majewski2@samsung.com>
---
v2 -> v3: fixed error handling of devm_regulator_get_optional to handle
  the case in which the regulator is available, but enabling it fails.
  Also removed the error message, split into two commits and reworded
  the commit message.

 drivers/thermal/samsung/exynos_tmu.c | 49 +++++++++-------------------
 1 file changed, 15 insertions(+), 34 deletions(-)

diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
index 6070b03cff9d..a0a1f7e1e63f 100644
--- a/drivers/thermal/samsung/exynos_tmu.c
+++ b/drivers/thermal/samsung/exynos_tmu.c
@@ -157,7 +157,6 @@ enum soc_type {
  * @reference_voltage: reference voltage of amplifier
  *	in the positive-TC generator block
  *	0 < reference_voltage <= 31
- * @regulator: pointer to the TMU regulator structure.
  * @tzd: pointer to thermal_zone_device structure
  * @ntrip: number of supported trip points.
  * @enabled: current status of TMU device
@@ -183,7 +182,6 @@ struct exynos_tmu_data {
 	u16 temp_error1, temp_error2;
 	u8 gain;
 	u8 reference_voltage;
-	struct regulator *regulator;
 	struct thermal_zone_device *tzd;
 	unsigned int ntrip;
 	bool enabled;
@@ -994,50 +992,40 @@ static int exynos_tmu_probe(struct platform_device *pdev)
 	 * TODO: Add regulator as an SOC feature, so that regulator enable
 	 * is a compulsory call.
 	 */
-	data->regulator = devm_regulator_get_optional(&pdev->dev, "vtmu");
-	if (!IS_ERR(data->regulator)) {
-		ret = regulator_enable(data->regulator);
-		if (ret) {
-			dev_err(&pdev->dev, "failed to enable vtmu\n");
-			return ret;
-		}
-	} else {
-		ret = PTR_ERR(data->regulator);
-		switch (ret) {
-		case -ENODEV:
-			break;
-		case -EPROBE_DEFER:
-			return -EPROBE_DEFER;
-		default:
-			dev_err(&pdev->dev, "Failed to get regulator: %d\n",
-				ret);
-			return ret;
-		}
+	ret = devm_regulator_get_enable_optional(&pdev->dev, "vtmu");
+	switch (ret) {
+	case 0:
+	case -ENODEV:
+		break;
+	case -EPROBE_DEFER:
+		return -EPROBE_DEFER;
+	default:
+		dev_err(&pdev->dev, "Failed to get enabled regulator: %d\n",
+			ret);
+		return ret;
 	}
 
 	ret = exynos_map_dt_data(pdev);
 	if (ret)
-		goto err_sensor;
+		return ret;
 
 	data->clk = devm_clk_get(&pdev->dev, "tmu_apbif");
 	if (IS_ERR(data->clk)) {
 		dev_err(&pdev->dev, "Failed to get clock\n");
-		ret = PTR_ERR(data->clk);
-		goto err_sensor;
+		return PTR_ERR(data->clk);
 	}
 
 	data->clk_sec = devm_clk_get(&pdev->dev, "tmu_triminfo_apbif");
 	if (IS_ERR(data->clk_sec)) {
 		if (data->soc == SOC_ARCH_EXYNOS5420_TRIMINFO) {
 			dev_err(&pdev->dev, "Failed to get triminfo clock\n");
-			ret = PTR_ERR(data->clk_sec);
-			goto err_sensor;
+			return PTR_ERR(data->clk_sec);
 		}
 	} else {
 		ret = clk_prepare(data->clk_sec);
 		if (ret) {
 			dev_err(&pdev->dev, "Failed to get clock\n");
-			goto err_sensor;
+			return ret;
 		}
 	}
 
@@ -1107,10 +1095,6 @@ static int exynos_tmu_probe(struct platform_device *pdev)
 err_clk_sec:
 	if (!IS_ERR(data->clk_sec))
 		clk_unprepare(data->clk_sec);
-err_sensor:
-	if (!IS_ERR(data->regulator))
-		regulator_disable(data->regulator);
-
 	return ret;
 }
 
@@ -1125,9 +1109,6 @@ static int exynos_tmu_remove(struct platform_device *pdev)
 	if (!IS_ERR(data->clk_sec))
 		clk_unprepare(data->clk_sec);
 
-	if (!IS_ERR(data->regulator))
-		regulator_disable(data->regulator);
-
 	return 0;
 }
 
-- 
2.42.0