mfd: Add device-tree support for da9502 i2c driver

This patch adds device-tree support for dialog MFD and the binding
documentations.

Signed-off-by: Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>
Cc: Samuel Ortiz <sameo@linux.intel.com>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: Shawn Guo <shawn.guo@linaro.org>
Cc: Ashish Jangam <ashish.jangam@kpitcummins.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

2 files changed, 102 insertions, 8 deletions

diff --git a/Documentation/devicetree/bindings/mfd/da9052-i2c.txt b/Documentation/devicetree/bindings/mfd/da9052-i2c.txt
new file mode 100644
index 000000000000..1857f4a6b9a9
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/da9052-i2c.txt
@@ -0,0 +1,60 @@
+* Dialog DA9052/53 Power Management Integrated Circuit (PMIC)
+
+Required properties:
+- compatible : Should be "dlg,da9052", "dlg,da9053-aa",
+                         "dlg,da9053-ab", or "dlg,da9053-bb"
+
+Sub-nodes:
+- regulators : Contain the regulator nodes. The DA9052/53 regulators are
+  bound using their names as listed below:
+
+    buck0     : regulator BUCK0
+    buck1     : regulator BUCK1
+    buck2     : regulator BUCK2
+    buck3     : regulator BUCK3
+    ldo4      : regulator LDO4
+    ldo5      : regulator LDO5
+    ldo6      : regulator LDO6
+    ldo7      : regulator LDO7
+    ldo8      : regulator LDO8
+    ldo9      : regulator LDO9
+    ldo10     : regulator LDO10
+    ldo11     : regulator LDO11
+    ldo12     : regulator LDO12
+    ldo13     : regulator LDO13
+
+  The bindings details of individual regulator device can be found in:
+  Documentation/devicetree/bindings/regulator/regulator.txt
+
+Examples:
+
+i2c@63fc8000 { /* I2C1 */
+        status = "okay";
+
+        pmic: dialog@48 {
+                compatible = "dlg,da9053-aa";
+                reg = <0x48>;
+
+                regulators {
+                        buck0 {
+                                regulator-min-microvolt = <500000>;
+                                regulator-max-microvolt = <2075000>;
+                        };
+
+                        buck1 {
+                                regulator-min-microvolt = <500000>;
+                                regulator-max-microvolt = <2075000>;
+                        };
+
+                        buck2 {
+                                regulator-min-microvolt = <925000>;
+                                regulator-max-microvolt = <2500000>;
+                        };
+
+                        buck3 {
+                                regulator-min-microvolt = <925000>;
+                                regulator-max-microvolt = <2500000>;
+                        };
+                };
+        };
+};
diff --git a/drivers/mfd/da9052-i2c.c b/drivers/mfd/da9052-i2c.c
index 36b88e395499..d8abdb35161e 100644
--- a/drivers/mfd/da9052-i2c.c
+++ b/drivers/mfd/da9052-i2c.c
@@ -22,6 +22,11 @@
 #include <linux/mfd/da9052/da9052.h>
 #include <linux/mfd/da9052/reg.h>
 
+#ifdef CONFIG_OF
+#include <linux/of.h>
+#include <linux/of_device.h>
+#endif
+
 static int da9052_i2c_enable_multiwrite(struct da9052 *da9052)
 {
         int reg_val, ret;
@@ -41,6 +46,24 @@ static int da9052_i2c_enable_multiwrite(struct da9052 *da9052)
         return 0;
 }
 
+static struct i2c_device_id da9052_i2c_id[] = {
+        {"da9052", DA9052},
+        {"da9053-aa", DA9053_AA},
+        {"da9053-ba", DA9053_BA},
+        {"da9053-bb", DA9053_BB},
+        {}
+};
+
+#ifdef CONFIG_OF
+static const struct of_device_id dialog_dt_ids[] = {
+        { .compatible = "dlg,da9052", .data = &da9052_i2c_id[0] },
+        { .compatible = "dlg,da9053-aa", .data = &da9052_i2c_id[1] },
+        { .compatible = "dlg,da9053-ab", .data = &da9052_i2c_id[2] },
+        { .compatible = "dlg,da9053-bb", .data = &da9052_i2c_id[3] },
+        { /* sentinel */ }
+};
+#endif
+
 static int __devinit da9052_i2c_probe(struct i2c_client *client,
                                        const struct i2c_device_id *id)
 {
@@ -76,6 +99,22 @@ static int __devinit da9052_i2c_probe(struct i2c_client *client,
         if (ret < 0)
                 goto err_regmap;
 
+#ifdef CONFIG_OF
+        if (!id) {
+                struct device_node *np = client->dev.of_node;
+                const struct of_device_id *deviceid;
+
+                deviceid = of_match_node(np, dialog_dt_ids);
+                id = (const struct i2c_device_id *)deviceid->data;
+        }
+#endif
+
+        if (!id) {
+                ret = -ENODEV;
+                dev_err(&client->dev, "id is null.\n");
+                goto err_regmap;
+        }
+
         ret = da9052_device_init(da9052, id->driver_data);
         if (ret != 0)
                 goto err_regmap;
@@ -100,14 +139,6 @@ static int __devexit da9052_i2c_remove(struct i2c_client *client)
         return 0;
 }
 
-static struct i2c_device_id da9052_i2c_id[] = {
-        {"da9052", DA9052},
-        {"da9053-aa", DA9053_AA},
-        {"da9053-ba", DA9053_BA},
-        {"da9053-bb", DA9053_BB},
-        {}
-};
-
 static struct i2c_driver da9052_i2c_driver = {
         .probe = da9052_i2c_probe,
         .remove = __devexit_p(da9052_i2c_remove),
@@ -115,6 +146,9 @@ static struct i2c_driver da9052_i2c_driver = {
         .driver = {
                 .name = "da9052",
                 .owner = THIS_MODULE,
+#ifdef CONFIG_OF
+                .of_match_table = dialog_dt_ids,
+#endif
         },
 };