1 files changed, 30 insertions, 9 deletions

diff --git a/drivers/regulator/gpio-regulator.c b/drivers/regulator/gpio-regulator.c
index 110ee6fe76c4..6351ceefdb3e 100644
--- a/drivers/regulator/gpio-regulator.c
+++ b/drivers/regulator/gpio-regulator.c
@@ -148,6 +148,13 @@ of_get_gpio_regulator_config(struct device *dev, struct device_node *np,
 
 	config->supply_name = config->init_data->constraints.name;
 
+	if (config->init_data->constraints.boot_on)
+		config->enabled_at_boot = true;
+
+	/*
+	 * Do not use: undocumented device tree property.
+	 * This is kept around solely for device tree ABI stability.
+	 */
 	if (of_property_read_bool(np, "enable-at-boot"))
 		config->enabled_at_boot = true;
 
@@ -213,6 +220,9 @@ of_get_gpio_regulator_config(struct device *dev, struct device_node *np,
 				 regtype);
 	}
 
+	if (of_property_present(np, "vin-supply"))
+		config->input_supply = "vin";
+
 	return config;
 }
 
@@ -230,7 +240,7 @@ static int gpio_regulator_probe(struct platform_device *pdev)
 	struct regulator_config cfg = { };
 	struct regulator_dev *rdev;
 	enum gpiod_flags gflags;
-	int ptr, ret, state, i;
+	int ptr, state, i;
 
 	drvdata = devm_kzalloc(dev, sizeof(struct gpio_regulator_data),
 			       GFP_KERNEL);
@@ -250,10 +260,22 @@ static int gpio_regulator_probe(struct platform_device *pdev)
 		return -ENOMEM;
 	}
 
-	drvdata->gpiods = devm_kzalloc(dev, sizeof(struct gpio_desc *),
-				       GFP_KERNEL);
+	drvdata->gpiods = devm_kcalloc(dev, config->ngpios,
+				       sizeof(struct gpio_desc *), GFP_KERNEL);
 	if (!drvdata->gpiods)
 		return -ENOMEM;
+
+	if (config->input_supply) {
+		drvdata->desc.supply_name = devm_kstrdup(&pdev->dev,
+							 config->input_supply,
+							 GFP_KERNEL);
+		if (!drvdata->desc.supply_name) {
+			dev_err(&pdev->dev,
+				"Failed to allocate input supply\n");
+			return -ENOMEM;
+		}
+	}
+
 	for (i = 0; i < config->ngpios; i++) {
 		drvdata->gpiods[i] = devm_gpiod_get_index(dev,
 							  NULL,
@@ -311,7 +333,7 @@ static int gpio_regulator_probe(struct platform_device *pdev)
 
 	/*
 	 * The signal will be inverted by the GPIO core if flagged so in the
-	 * decriptor.
+	 * descriptor.
 	 */
 	if (config->enabled_at_boot)
 		gflags = GPIOD_OUT_HIGH | GPIOD_FLAGS_BIT_NONEXCLUSIVE;
@@ -323,11 +345,9 @@ static int gpio_regulator_probe(struct platform_device *pdev)
 		return PTR_ERR(cfg.ena_gpiod);
 
 	rdev = devm_regulator_register(dev, &drvdata->desc, &cfg);
-	if (IS_ERR(rdev)) {
-		ret = PTR_ERR(rdev);
-		dev_err(dev, "Failed to register regulator: %d\n", ret);
-		return ret;
-	}
+	if (IS_ERR(rdev))
+		return dev_err_probe(dev, PTR_ERR(rdev),
+				     "Failed to register regulator\n");
 
 	platform_set_drvdata(pdev, drvdata);
 
@@ -346,6 +366,7 @@ static struct platform_driver gpio_regulator_driver = {
 	.probe		= gpio_regulator_probe,
 	.driver		= {
 		.name		= "gpio-regulator",
+		.probe_type	= PROBE_PREFER_ASYNCHRONOUS,
 		.of_match_table = of_match_ptr(regulator_gpio_of_match),
 	},
 };