iio: dac: mcp4725: add devicetree support

Signed-off-by: Tomas Novotny <tomas@novotny.cz>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/drivers/iio/dac/mcp4725.c b/drivers/iio/dac/mcp4725.c
index 1e9d8f387e009f54b0991ae7e26fc624bdc7ebc2..fae80eb1a98a0a52a357447d87abd1282a82bab6 100644 (file)
--- a/drivers/iio/dac/mcp4725.c
+++ b/drivers/iio/dac/mcp4725.c
@@ -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>
@@ -364,22 +365,41 @@ 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)
 {
        struct mcp4725_data *data;
        struct iio_dev *indio_dev;
-       struct mcp4725_platform_data *pdata = dev_get_platdata(&client->dev);
+       struct mcp4725_platform_data *pdata, pdata_dt;
        u8 inbuf[4];
        u8 pd;
        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;
@@ -387,6 +407,17 @@ static int mcp4725_probe(struct i2c_client *client,
        i2c_set_clientdata(client, indio_dev);
        data->client = client;
        data->id = id->driver_data;
+       pdata = dev_get_platdata(&client->dev);
+
+       if (!pdata) {
+               err = mcp4725_probe_dt(&client->dev, &pdata_dt);
+               if (err) {
+                       dev_err(&client->dev,
+                               "invalid platform or devicetree data");
+                       return err;
+               }
+               pdata = &pdata_dt;
+       }
 
        if (data->id == MCP4725 && pdata->use_vref) {
                dev_err(&client->dev,