[PATCH v2] hwmon: (nct7802) hwmon: (nct7802) Add device tree support

[Constantine Shulyupin <const@MakeLinux.com>]

Introduced properties sensorX-type with string values
"disabled", "thermal diode", "thermistor" and "voltage".

Signed-off-by: Constantine Shulyupin <const@MakeLinux.com>
---
Changed in v2:
- removed tempX_type
- introduced nuvoton,sensorX-type with string values

Changed in v1:
- Introduced tempX_type with numerical values
---
 drivers/hwmon/nct7802.c | 43 ++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 40 insertions(+), 3 deletions(-)

diff --git a/drivers/hwmon/nct7802.c b/drivers/hwmon/nct7802.c
index 3ce33d2..edd9063 100644
--- a/drivers/hwmon/nct7802.c
+++ b/drivers/hwmon/nct7802.c
@@ -1077,9 +1077,11 @@ static const struct regmap_config nct7802_regmap_config = {
 	.volatile_reg = nct7802_regmap_is_volatile,
 };
 
-static int nct7802_init_chip(struct nct7802_data *data)
+static int nct7802_init_chip(struct device_node *node,
+			     struct nct7802_data *data)
 {
 	int err;
+	int i;
 
 	/* Enable ADC */
 	err = regmap_update_bits(data->regmap, REG_START, 0x01, 0x01);
@@ -1092,7 +1094,34 @@ static int nct7802_init_chip(struct nct7802_data *data)
 		return err;
 
 	/* Enable Vcore and VCC voltage monitoring */
-	return regmap_update_bits(data->regmap, REG_VMON_ENABLE, 0x03, 0x03);
+	err =  regmap_update_bits(data->regmap, REG_VMON_ENABLE, 0x03, 0x03);
+	if (err)
+		return err;
+
+	for (i = 0; i < 3; i++) {
+		char propname[30];
+		const char *val;
+		int senor_type;
+
+		snprintf(propname, sizeof(propname), "nuvoton,sensor%d-type",
+			 i + 1);
+		err = of_property_read_string(node, propname, &val);
+		if (err < 0)
+			break;
+		if (!strcmp(val, "disabled"))
+			senor_type = 0;
+		else if (!strcmp(val, "thermal diode"))
+			senor_type = 1;
+		else if (!strcmp(val, "thermistor"))
+			senor_type = 2;
+		else if (!strcmp(val, "voltage"))
+			senor_type = 3;
+		else
+			return -EINVAL;
+		err = regmap_update_bits(data->regmap, REG_MODE,
+					 3 << 2 * i, senor_type << 2 * i);
+	}
+	return 0;
 }
 
 static int nct7802_probe(struct i2c_client *client,
@@ -1113,7 +1142,7 @@ static int nct7802_probe(struct i2c_client *client,
 
 	mutex_init(&data->access_lock);
 
-	ret = nct7802_init_chip(data);
+	ret = nct7802_init_chip(client->dev.of_node, data);
 	if (ret < 0)
 		return ret;
 
@@ -1133,10 +1162,18 @@ static const struct i2c_device_id nct7802_idtable[] = {
 };
 MODULE_DEVICE_TABLE(i2c, nct7802_idtable);
 
+#ifdef CONFIG_OF
+static const struct of_device_id nct7802_dt_match[] = {
+	{ .compatible = "nuvoton,nct7802" },
+	{ },
+};
+#endif
+
 static struct i2c_driver nct7802_driver = {
 	.class = I2C_CLASS_HWMON,
 	.driver = {
 		.name = DRVNAME,
+		.of_match_table = of_match_ptr(nct7802_dt_match),
 	},
 	.detect = nct7802_detect,
 	.probe = nct7802_probe,
-- 
1.9.1