regulator: max597x: Align for simple_mfd_i2c driver

Use regmap provided by simple_mfd_i2c driver and remove unused variable.
Identify device variant by checking compatible property in DT.

Signed-off-by: Naresh Solanki <Naresh.Solanki@9elements.com>
Link: https://lore.kernel.org/r/20230216075302.68935-1-Naresh.Solanki@9elements.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: nsolanki22

drivers/regulator/max597x-regulator.c

@@ -425,54 +425,72 @@ static int max597x_setup_irq(struct device *dev,
 
 static int max597x_regulator_probe(struct platform_device *pdev)
 {
-
-
-	struct max597x_data *max597x = dev_get_drvdata(pdev->dev.parent);
+	struct max597x_data *max597x;
+	struct regmap *regmap = dev_get_regmap(pdev->dev.parent, NULL);
 	struct max597x_regulator *data;
-
+	struct i2c_client *i2c = to_i2c_client(pdev->dev.parent);
 	struct regulator_config config = { };
 	struct regulator_dev *rdev;
 	struct regulator_dev *rdevs[MAX5970_NUM_SWITCHES];
-	int num_switches = max597x->num_switches;
+	int num_switches;
 	int ret, i;
 
+	if (!regmap)
+		return -EPROBE_DEFER;
+
+	max597x = devm_kzalloc(&i2c->dev, sizeof(struct max597x_data), GFP_KERNEL);
+	if (!max597x)
+		return -ENOMEM;
+
+	i2c_set_clientdata(i2c, max597x);
+
+	if (of_device_is_compatible(i2c->dev.of_node, "maxim,max5978"))
+		max597x->num_switches = MAX597x_TYPE_MAX5978;
+	else if (of_device_is_compatible(i2c->dev.of_node, "maxim,max5970"))
+		max597x->num_switches = MAX597x_TYPE_MAX5970;
+	else
+		return -ENODEV;
+
+	i2c_set_clientdata(i2c, max597x);
+	num_switches = max597x->num_switches;
+
 	for (i = 0; i < num_switches; i++) {
 		data =
-		    devm_kzalloc(max597x->dev, sizeof(struct max597x_regulator),
+		    devm_kzalloc(&i2c->dev, sizeof(struct max597x_regulator),
 				 GFP_KERNEL);
 		if (!data)
 			return -ENOMEM;
 
 		data->num_switches = num_switches;
-		data->regmap = max597x->regmap;
+		data->regmap = regmap;
 
-		ret = max597x_adc_range(data->regmap, i, &max597x->irng[i], &max597x->mon_rng[i]);
+		ret = max597x_adc_range(regmap, i, &max597x->irng[i], &max597x->mon_rng[i]);
 		if (ret < 0)
 			return ret;
 
 		data->irng = max597x->irng[i];
 		data->mon_rng = max597x->mon_rng[i];
 
-		config.dev = max597x->dev;
+		config.dev = &i2c->dev;
 		config.driver_data = (void *)data;
 		config.regmap = data->regmap;
-		rdev = devm_regulator_register(max597x->dev,
+		rdev = devm_regulator_register(&i2c->dev,
 					       &regulators[i], &config);
 		if (IS_ERR(rdev)) {
-			dev_err(max597x->dev, "failed to register regulator %s\n",
+			dev_err(&i2c->dev, "failed to register regulator %s\n",
 				regulators[i].name);
 			return PTR_ERR(rdev);
 		}
 		rdevs[i] = rdev;
 		max597x->shunt_micro_ohms[i] = data->shunt_micro_ohms;
 	}
 
-	if (max597x->irq) {
+	if (i2c->irq) {
 		ret =
-		    max597x_setup_irq(max597x->dev, max597x->irq, rdevs, num_switches,
+		    max597x_setup_irq(&i2c->dev, i2c->irq, rdevs, num_switches,
 				      data);
 		if (ret) {
-			dev_err(max597x->dev, "IRQ setup failed");
+			dev_err(&i2c->dev, "IRQ setup failed");
 			return ret;
 		}
 	}