[PATCH v2 4/4] iio: dac: mcp4725: add devicetree support

@@ -19,6 +19,7 @@
 #include <linux/err.h>
 #include <linux/delay.h>
 #include <linux/regulator/consumer.h>
+#include <linux/of.h>
 
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>

@@ -364,6 +365,30 @@ static const struct iio_info mcp4725_info = {
 	.driver_module = THIS_MODULE,
 };
 
+#ifdef CONFIG_OF
+static int mcp4725_probe_dt(struct device *dev,
+			    struct mcp4725_platform_data *pdata)
+{
+	struct device_node *np = dev->of_node;
+
+	if (!np)
+		return -ENODEV;
+
+	/* check if is the vref-supply defined */
+	pdata->use_vref = of_property_read_bool(np, "vref-supply");
+	pdata->vref_buffered =
+		of_property_read_bool(np, "microchip,vref-buffered");
+
+	return 0;
+}
+#else
+static int mcp4725_probe_dt(struct device *dev,
+			    struct mcp4725_platform_data *platform_data)
+{
+	return -ENODEV;
+}
+#endif
+
 static int mcp4725_probe(struct i2c_client *client,
 			 const struct i2c_device_id *id)
 {

@@ -375,11 +400,6 @@ static int mcp4725_probe(struct i2c_client *client,
 	u8 ref;
 	int err;
 
-	if (!pdata) {
-		dev_err(&client->dev, "invalid platform data");
-		return -EINVAL;
-	}
-
 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
 	if (indio_dev == NULL)
 		return -ENOMEM;

@@ -388,6 +408,19 @@ static int mcp4725_probe(struct i2c_client *client,
 	data->client = client;
 	data->id = id->driver_data;
 
+	if (!pdata) {
+		pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
+		if (!pdata)
+			return -ENOMEM;
+
+		err = mcp4725_probe_dt(&client->dev, pdata);
+		if (err) {
+			dev_err(&client->dev,
+				"invalid platform or devicetree data");
+			return err;
+		}
+	}
+
 	if (data->id == MCP4725 && pdata->use_vref) {
 		dev_warn(&client->dev,
 			"ignoring unavailable external reference on MCP4725");

@@ -460,6 +493,9 @@ static int mcp4725_probe(struct i2c_client *client,
 	if (err)
 		goto err_disable_vref_reg;
 
+	if (!dev_get_platdata(&client->dev))
+		devm_kfree(&client->dev, pdata);
+
 	return 0;
 
 err_disable_vref_reg: