iio: adc: ti-ads1015: Make use of device property API

Make use of device property API in this driver so that both OF based
system and ACPI based system can use this driver.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/adc/ti-ads1015.c

@@ -12,10 +12,10 @@
  */
 
 #include <linux/module.h>
-#include <linux/of_device.h>
 #include <linux/init.h>
 #include <linux/irq.h>
 #include <linux/i2c.h>
+#include <linux/property.h>
 #include <linux/regmap.h>
 #include <linux/pm_runtime.h>
 #include <linux/mutex.h>
@@ -77,6 +77,7 @@
 #define ADS1015_DEFAULT_CHAN		0
 
 enum chip_ids {
+	ADSXXXX = 0,
 	ADS1015,
 	ADS1115,
 };
@@ -843,65 +844,58 @@ static const struct iio_info ads1115_info = {
 	.attrs          = &ads1115_attribute_group,
 };
 
-#ifdef CONFIG_OF
-static int ads1015_get_channels_config_of(struct i2c_client *client)
+static int ads1015_client_get_channels_config(struct i2c_client *client)
 {
 	struct iio_dev *indio_dev = i2c_get_clientdata(client);
 	struct ads1015_data *data = iio_priv(indio_dev);
-	struct device_node *node;
+	struct device *dev = &client->dev;
+	struct fwnode_handle *node;
+	int i = -1;
 
-	if (!client->dev.of_node ||
-	    !of_get_next_child(client->dev.of_node, NULL))
-		return -EINVAL;
-
-	for_each_child_of_node(client->dev.of_node, node) {
+	device_for_each_child_node(dev, node) {
 		u32 pval;
 		unsigned int channel;
 		unsigned int pga = ADS1015_DEFAULT_PGA;
 		unsigned int data_rate = ADS1015_DEFAULT_DATA_RATE;
 
-		if (of_property_read_u32(node, "reg", &pval)) {
-			dev_err(&client->dev, "invalid reg on %pOF\n",
-				node);
+		if (fwnode_property_read_u32(node, "reg", &pval)) {
+			dev_err(dev, "invalid reg on %pfw\n", node);
 			continue;
 		}
 
 		channel = pval;
 		if (channel >= ADS1015_CHANNELS) {
-			dev_err(&client->dev,
-				"invalid channel index %d on %pOF\n",
+			dev_err(dev, "invalid channel index %d on %pfw\n",
 				channel, node);
 			continue;
 		}
 
-		if (!of_property_read_u32(node, "ti,gain", &pval)) {
+		if (!fwnode_property_read_u32(node, "ti,gain", &pval)) {
 			pga = pval;
 			if (pga > 6) {
-				dev_err(&client->dev, "invalid gain on %pOF\n",
-					node);
-				of_node_put(node);
+				dev_err(dev, "invalid gain on %pfw\n", node);
+				fwnode_handle_put(node);
 				return -EINVAL;
 			}
 		}
 
-		if (!of_property_read_u32(node, "ti,datarate", &pval)) {
+		if (!fwnode_property_read_u32(node, "ti,datarate", &pval)) {
 			data_rate = pval;
 			if (data_rate > 7) {
-				dev_err(&client->dev,
-					"invalid data_rate on %pOF\n",
-					node);
-				of_node_put(node);
+				dev_err(dev, "invalid data_rate on %pfw\n", node);
+				fwnode_handle_put(node);
 				return -EINVAL;
 			}
 		}
 
 		data->channel_data[channel].pga = pga;
 		data->channel_data[channel].data_rate = data_rate;
+
+		i++;
 	}
 
-	return 0;
+	return i < 0 ? -EINVAL : 0;
 }
-#endif
 
 static void ads1015_get_channels_config(struct i2c_client *client)
 {
@@ -910,10 +904,9 @@ static void ads1015_get_channels_config(struct i2c_client *client)
 	struct iio_dev *indio_dev = i2c_get_clientdata(client);
 	struct ads1015_data *data = iio_priv(indio_dev);
 
-#ifdef CONFIG_OF
-	if (!ads1015_get_channels_config_of(client))
+	if (!ads1015_client_get_channels_config(client))
 		return;
-#endif
+
 	/* fallback on default configuration */
 	for (k = 0; k < ADS1015_CHANNELS; ++k) {
 		data->channel_data[k].pga = ADS1015_DEFAULT_PGA;
@@ -951,9 +944,8 @@ static int ads1015_probe(struct i2c_client *client,
 	indio_dev->name = ADS1015_DRV_NAME;
 	indio_dev->modes = INDIO_DIRECT_MODE;
 
-	if (client->dev.of_node)
-		chip = (enum chip_ids)of_device_get_match_data(&client->dev);
-	else
+	chip = (enum chip_ids)device_get_match_data(&client->dev);
+	if (chip == ADSXXXX)
 		chip = id->driver_data;
 	switch (chip) {
 	case ADS1015:
@@ -968,6 +960,9 @@ static int ads1015_probe(struct i2c_client *client,
 		indio_dev->info = &ads1115_info;
 		data->data_rate = (unsigned int *) &ads1115_data_rate;
 		break;
+	default:
+		dev_err(&client->dev, "Unknown chip %d\n", chip);
+		return -EINVAL;
 	}
 
 	data->event_channel = ADS1015_CHANNELS;