regulator: s2mps11: refactor handling of external rail control

Refactor s2mps14_pmic_enable_ext_control() and s2mps11_of_parse_cb()
slightly as a preparation for adding S2MPG10 and S2MPG11 support, as
both of those PMICs also support control of rails via GPIOs.

This also includes the following to avoid further updates in follow-up
commits:
* On S2MPG10 and S2MPG11, external rail control can be via GPIO or via
  non-GPIO signals, hence passing a GPIO is allowed to be optional.
  This avoids inappropriate verbose driver messages.
* Prepare to allow use of standard DT property name 'enable-gpios' for
  newer platforms instead of vendor-specific 'samsung,ext-control'.

Signed-off-by: André Draszik <andre.draszik@linaro.org>
Link: https://patch.msgid.link/20260122-s2mpg1x-regulators-v7-15-3b1f9831fffd@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: andred

drivers/regulator/s2mps11.c

@@ -328,29 +328,15 @@ static int s2mps11_regulator_set_suspend_disable(struct regulator_dev *rdev)
 				  rdev->desc->enable_mask, state);
 }
 
-static int s2mps11_of_parse_cb(struct device_node *np,
-			       const struct regulator_desc *desc,
-			       struct regulator_config *config)
+static int s2mps11_of_parse_gpiod(struct device_node *np,
+				  const char *con_id, bool optional,
+				  const struct regulator_desc *desc,
+				  struct regulator_config *config)
 {
-	const struct s2mps11_info *s2mps11 = config->driver_data;
 	struct gpio_desc *ena_gpiod;
 	int ret;
 
-	if (s2mps11->dev_type == S2MPS14X)
-		switch (desc->id) {
-		case S2MPS14_LDO10:
-		case S2MPS14_LDO11:
-		case S2MPS14_LDO12:
-			break;
-
-		default:
-			return 0;
-		}
-	else
-		return 0;
-
-	ena_gpiod = fwnode_gpiod_get_index(of_fwnode_handle(np),
-					   "samsung,ext-control", 0,
+	ena_gpiod = fwnode_gpiod_get_index(of_fwnode_handle(np), con_id, 0,
 					   GPIOD_OUT_HIGH |
 					   GPIOD_FLAGS_BIT_NONEXCLUSIVE,
 					   "s2mps11-regulator");
@@ -361,14 +347,19 @@ static int s2mps11_of_parse_cb(struct device_node *np,
 		if (ret == -EPROBE_DEFER)
 			return ret;
 
-		if (ret == -ENOENT)
+		if (ret == -ENOENT) {
+			if (optional)
+				return 0;
+
 			dev_info(config->dev,
 				 "No entry for control GPIO for %d/%s in node %pOF\n",
 				 desc->id, desc->name, np);
-		else
+		} else {
 			dev_warn_probe(config->dev, ret,
 				       "Failed to get control GPIO for %d/%s in node %pOF\n",
 				       desc->id, desc->name, np);
+		}
+
 		return 0;
 	}
 
@@ -380,6 +371,29 @@ static int s2mps11_of_parse_cb(struct device_node *np,
 	return 0;
 }
 
+static int s2mps11_of_parse_cb(struct device_node *np,
+			       const struct regulator_desc *desc,
+			       struct regulator_config *config)
+{
+	const struct s2mps11_info *s2mps11 = config->driver_data;
+
+	if (s2mps11->dev_type == S2MPS14X)
+		switch (desc->id) {
+		case S2MPS14_LDO10:
+		case S2MPS14_LDO11:
+		case S2MPS14_LDO12:
+			break;
+
+		default:
+			return 0;
+		}
+	else
+		return 0;
+
+	return s2mps11_of_parse_gpiod(np, "samsung,ext-control", false, desc,
+				      config);
+}
+
 static const struct regulator_ops s2mps11_ldo_ops = {
 	.list_voltage		= regulator_list_voltage_linear,
 	.map_voltage		= regulator_map_voltage_linear,
@@ -903,10 +917,16 @@ static const struct regulator_desc s2mps15_regulators[] = {
 };
 
 static int s2mps14_pmic_enable_ext_control(struct s2mps11_info *s2mps11,
-		struct regulator_dev *rdev)
+					   struct regulator_dev *rdev)
 {
-	return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
-			rdev->desc->enable_mask, S2MPS14_ENABLE_EXT_CONTROL);
+	int ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
+				     rdev->desc->enable_mask,
+				     S2MPS14_ENABLE_EXT_CONTROL);
+	if (ret < 0)
+		return dev_err_probe(rdev_get_dev(rdev), ret,
+				     "failed to enable GPIO control over %d/%s\n",
+				     rdev->desc->id, rdev->desc->name);
+	return 0;
 }
 
 static int s2mpu02_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
@@ -1244,6 +1264,26 @@ static const struct regulator_desc s2mpu05_regulators[] = {
 	regulator_desc_s2mpu05_buck45(5),
 };
 
+static int s2mps11_handle_ext_control(struct s2mps11_info *s2mps11,
+				      struct regulator_dev *rdev)
+{
+	int ret;
+
+	switch (s2mps11->dev_type) {
+	case S2MPS14X:
+		if (!rdev->ena_pin)
+			return 0;
+
+		ret = s2mps14_pmic_enable_ext_control(s2mps11, rdev);
+		break;
+
+	default:
+		return 0;
+	}
+
+	return ret;
+}
+
 static int s2mps11_pmic_probe(struct platform_device *pdev)
 {
 	struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
@@ -1314,15 +1354,9 @@ static int s2mps11_pmic_probe(struct platform_device *pdev)
 					     regulators[i].id,
 					     regulators[i].name);
 
-		if (regulator->ena_pin) {
-			ret = s2mps14_pmic_enable_ext_control(s2mps11,
-							      regulator);
-			if (ret < 0)
-				return dev_err_probe(&pdev->dev, ret,
-						     "failed to enable GPIO control over %d/%s\n",
-						     regulator->desc->id,
-						     regulator->desc->name);
-		}
+		ret = s2mps11_handle_ext_control(s2mps11, regulator);
+		if (ret < 0)
+			return ret;
 	}
 
 	return 0;