regulator: da9210: addition of device tree support

Addition of device tree support for DA9210.
Two files are modified, the driver source file and the binding document.

Updates for the regulator source file include an .of_match_table entry and
node match checking in the probe() function for a compatible da9210 string.

Minor binding documentation changes have been made to the title and the
example.

Tested-by: Steve Twiss <stwiss.opensource@diasemi.com>
Signed-off-by: Steve Twiss <stwiss.opensource@diasemi.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/regulator/da9210.txt

@@ -1,4 +1,4 @@
-* Dialog Semiconductor DA9210 Voltage Regulator
+* Dialog Semiconductor DA9210 Multi-phase 12A DCDC BUCK Converter
 
 Required properties:
 
@@ -18,8 +18,12 @@ Example:
 		compatible = "dlg,da9210";
 		reg = <0x68>;
 
-		regulator-min-microvolt = <900000>;
-		regulator-max-microvolt = <1000000>;
+		interrupt-parent = <...>;
+		interrupts = <...>;
+
+		regulator-min-microvolt = <300000>;
+		regulator-max-microvolt = <1570000>;
+		regulator-min-microamp = <1600000>;
+		regulator-max-microamp = <4600000>;
 		regulator-boot-on;
-		regulator-always-on;
 	};

drivers/regulator/da9210-regulator.c

@@ -21,12 +21,11 @@
 #include <linux/err.h>
 #include <linux/i2c.h>
 #include <linux/module.h>
-#include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
-#include <linux/slab.h>
 #include <linux/regulator/driver.h>
 #include <linux/regulator/machine.h>
+#include <linux/of_device.h>
 #include <linux/regulator/of_regulator.h>
 #include <linux/regmap.h>
 
@@ -179,6 +178,13 @@ error_i2c:
 /*
  * I2C driver interface functions
  */
+
+static const struct of_device_id da9210_dt_ids[] = {
+	{ .compatible = "dlg,da9210", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, da9210_dt_ids);
+
 static int da9210_i2c_probe(struct i2c_client *i2c,
 			    const struct i2c_device_id *id)
 {
@@ -188,6 +194,16 @@ static int da9210_i2c_probe(struct i2c_client *i2c,
 	struct regulator_dev *rdev = NULL;
 	struct regulator_config config = { };
 	int error;
+	const struct of_device_id *match;
+
+	if (i2c->dev.of_node && !pdata) {
+		match = of_match_device(of_match_ptr(da9210_dt_ids),
+						&i2c->dev);
+		if (!match) {
+			dev_err(&i2c->dev, "Error: No device match found\n");
+			return -ENODEV;
+		}
+	}
 
 	chip = devm_kzalloc(&i2c->dev, sizeof(struct da9210), GFP_KERNEL);
 	if (!chip)
@@ -264,6 +280,7 @@ MODULE_DEVICE_TABLE(i2c, da9210_i2c_id);
 static struct i2c_driver da9210_regulator_driver = {
 	.driver = {
 		.name = "da9210",
+		.of_match_table = of_match_ptr(da9210_dt_ids),
 	},
 	.probe = da9210_i2c_probe,
 	.id_table = da9210_i2c_id,