5 files changed, 366 insertions, 3 deletions

diff --git a/Documentation/devicetree/bindings/regulator/max8997-regulator.txt b/Documentation/devicetree/bindings/regulator/max8997-regulator.txt
new file mode 100644
index 000000000000..9fd69a18b0ba
--- /dev/null
+++ b/Documentation/devicetree/bindings/regulator/max8997-regulator.txt
@@ -0,0 +1,146 @@
+* Maxim MAX8997 Voltage and Current Regulator
+
+The Maxim MAX8997 is a multi-function device which includes volatage and
+current regulators, rtc, charger controller and other sub-blocks. It is
+interfaced to the host controller using a i2c interface. Each sub-block is
+addressed by the host system using different i2c slave address. This document
+describes the bindings for 'pmic' sub-block of max8997.
+
+Required properties:
+- compatible: Should be "maxim,max8997-pmic".
+- reg: Specifies the i2c slave address of the pmic block. It should be 0x66.
+
+- max8997,pmic-buck1-dvs-voltage: A set of 8 voltage values in micro-volt (uV)
+  units for buck1 when changing voltage using gpio dvs. Refer to [1] below
+  for additional information.
+
+- max8997,pmic-buck2-dvs-voltage: A set of 8 voltage values in micro-volt (uV)
+  units for buck2 when changing voltage using gpio dvs. Refer to [1] below
+  for additional information.
+
+- max8997,pmic-buck5-dvs-voltage: A set of 8 voltage values in micro-volt (uV)
+  units for buck5 when changing voltage using gpio dvs. Refer to [1] below
+  for additional information.
+
+[1] If none of the 'max8997,pmic-buck[1/2/5]-uses-gpio-dvs' optional
+    property is specified, the 'max8997,pmic-buck[1/2/5]-dvs-voltage'
+    property should specify atleast one voltage level (which would be a
+    safe operating voltage).
+
+    If either of the 'max8997,pmic-buck[1/2/5]-uses-gpio-dvs' optional
+    property is specified, then all the eigth voltage values for the
+    'max8997,pmic-buck[1/2/5]-dvs-voltage' should be specified.
+
+Optional properties:
+- interrupt-parent: Specifies the phandle of the interrupt controller to which
+  the interrupts from max8997 are delivered to.
+- interrupts: Interrupt specifiers for two interrupt sources.
+  - First interrupt specifier is for 'irq1' interrupt.
+  - Second interrupt specifier is for 'alert' interrupt.
+- max8997,pmic-buck1-uses-gpio-dvs: 'buck1' can be controlled by gpio dvs.
+- max8997,pmic-buck2-uses-gpio-dvs: 'buck2' can be controlled by gpio dvs.
+- max8997,pmic-buck5-uses-gpio-dvs: 'buck5' can be controlled by gpio dvs.
+
+Additional properties required if either of the optional properties are used:
+- max8997,pmic-ignore-gpiodvs-side-effect: When GPIO-DVS mode is used for
+  multiple bucks, changing the voltage value of one of the bucks may affect
+  that of another buck, which is the side effect of the change (set_voltage).
+  Use this property to ignore such side effects and change the voltage.
+
+- max8997,pmic-buck125-default-dvs-idx: Default voltage setting selected from
+  the possible 8 options selectable by the dvs gpios. The value of this
+  property should be between 0 and 7. If not specified or if out of range, the
+  default value of this property is set to 0.
+
+- max8997,pmic-buck125-dvs-gpios: GPIO specifiers for three host gpio's used
+  for dvs. The format of the gpio specifier depends in the gpio controller.
+
+Regulators: The regulators of max8997 that have to be instantiated should be
+included in a sub-node named 'regulators'. Regulator nodes included in this
+sub-node should be of the format as listed below.
+
+        regulator_name {
+                standard regulator bindings here
+        };
+
+The following are the names of the regulators that the max8997 pmic block
+supports. Note: The 'n' in LDOn and BUCKn represents the LDO or BUCK number
+as per the datasheet of max8997.
+
+        - LDOn
+                  - valid values for n are 1 to 18 and 21
+                  - Example: LDO0, LD01, LDO2, LDO21
+        - BUCKn
+                  - valid values for n are 1 to 7.
+                  - Example: BUCK1, BUCK2, BUCK3, BUCK7
+
+        - ENVICHG: Battery Charging Current Monitor Output. This is a fixed
+                   voltage type regulator
+
+        - ESAFEOUT1: (ldo19)
+        - ESAFEOUT2: (ld020)
+
+        - CHARGER_CV: main battery charger voltage control
+        - CHARGER: main battery charger current control
+        - CHARGER_TOPOFF: end of charge current threshold level
+
+The bindings inside the regulator nodes use the standard regulator bindings
+which are documented elsewhere.
+
+Example:
+
+        max8997_pmic@66 {
+                compatible = "maxim,max8997-pmic";
+                interrupt-parent = <&wakeup_eint>;
+                reg = <0x66>;
+                interrupts = <4 0>, <3 0>;
+
+                max8997,pmic-buck1-uses-gpio-dvs;
+                max8997,pmic-buck2-uses-gpio-dvs;
+                max8997,pmic-buck5-uses-gpio-dvs;
+
+                max8997,pmic-ignore-gpiodvs-side-effect;
+                max8997,pmic-buck125-default-dvs-idx = <0>;
+
+                max8997,pmic-buck125-dvs-gpios = <&gpx0 0 1 0 0>, /* SET1 */
+                                                 <&gpx0 1 1 0 0>, /* SET2 */
+                                                 <&gpx0 2 1 0 0>; /* SET3 */
+
+                max8997,pmic-buck1-dvs-voltage = <1350000>, <1300000>,
+                                                 <1250000>, <1200000>,
+                                                 <1150000>, <1100000>,
+                                                 <1000000>, <950000>;
+
+                max8997,pmic-buck2-dvs-voltage = <1100000>, <1100000>,
+                                                 <1100000>, <1100000>,
+                                                 <1000000>, <1000000>,
+                                                 <1000000>, <1000000>;
+
+                max8997,pmic-buck5-dvs-voltage = <1200000>, <1200000>,
+                                                 <1200000>, <1200000>,
+                                                 <1200000>, <1200000>,
+                                                 <1200000>, <1200000>;
+
+                regulators {
+                        ldo1_reg: LDO1 {
+                                regulator-name = "VDD_ABB_3.3V";
+                                regulator-min-microvolt = <3300000>;
+                                regulator-max-microvolt = <3300000>;
+                        };
+
+                        ldo2_reg: LDO2 {
+                                regulator-name = "VDD_ALIVE_1.1V";
+                                regulator-min-microvolt = <1100000>;
+                                regulator-max-microvolt = <1100000>;
+                                regulator-always-on;
+                        };
+
+                        buck1_reg: BUCK1 {
+                                regulator-name = "VDD_ARM_1.2V";
+                                regulator-min-microvolt = <950000>;
+                                regulator-max-microvolt = <1350000>;
+                                regulator-always-on;
+                                regulator-boot-on;
+                        };
+                };
+        };
diff --git a/drivers/mfd/max8997.c b/drivers/mfd/max8997.c
index f123517065ec..abd5c80c7cf5 100644
--- a/drivers/mfd/max8997.c
+++ b/drivers/mfd/max8997.c
@@ -21,8 +21,10 @@
  * This driver is based on max8998.c
  */
 
+#include <linux/err.h>
 #include <linux/slab.h>
 #include <linux/i2c.h>
+#include <linux/of_irq.h>
 #include <linux/interrupt.h>
 #include <linux/pm_runtime.h>
 #include <linux/module.h>
@@ -47,6 +49,13 @@ static struct mfd_cell max8997_devs[] = {
         { .name = "max8997-led", .id = 2 },
 };
 
+#ifdef CONFIG_OF
+static struct of_device_id __devinitdata max8997_pmic_dt_match[] = {
+        { .compatible = "maxim,max8997-pmic", .data = TYPE_MAX8997 },
+        {},
+};
+#endif
+
 int max8997_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest)
 {
         struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
@@ -123,6 +132,58 @@ int max8997_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask)
 }
 EXPORT_SYMBOL_GPL(max8997_update_reg);
 
+#ifdef CONFIG_OF
+/*
+ * Only the common platform data elements for max8997 are parsed here from the
+ * device tree. Other sub-modules of max8997 such as pmic, rtc and others have
+ * to parse their own platform data elements from device tree.
+ *
+ * The max8997 platform data structure is instantiated here and the drivers for
+ * the sub-modules need not instantiate another instance while parsing their
+ * platform data.
+ */
+static struct max8997_platform_data *max8997_i2c_parse_dt_pdata(
+                                        struct device *dev)
+{
+        struct max8997_platform_data *pd;
+
+        pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
+        if (!pd) {
+                dev_err(dev, "could not allocate memory for pdata\n");
+                return ERR_PTR(-ENOMEM);
+        }
+
+        pd->ono = irq_of_parse_and_map(dev->of_node, 1);
+
+        /*
+         * ToDo: the 'wakeup' member in the platform data is more of a linux
+         * specfic information. Hence, there is no binding for that yet and
+         * not parsed here.
+         */
+
+        return pd;
+}
+#else
+static struct max8997_platform_data *max8997_i2c_parse_dt_pdata(
+                                        struct device *dev)
+{
+        return 0;
+}
+#endif
+
+static inline int max8997_i2c_get_driver_data(struct i2c_client *i2c,
+                                                const struct i2c_device_id *id)
+{
+#ifdef CONFIG_OF
+        if (i2c->dev.of_node) {
+                const struct of_device_id *match;
+                match = of_match_node(max8997_pmic_dt_match, i2c->dev.of_node);
+                return (int)match->data;
+        }
+#endif
+        return (int)id->driver_data;
+}
+
 static int max8997_i2c_probe(struct i2c_client *i2c,
                             const struct i2c_device_id *id)
 {
@@ -137,12 +198,21 @@ static int max8997_i2c_probe(struct i2c_client *i2c,
         i2c_set_clientdata(i2c, max8997);
         max8997->dev = &i2c->dev;
         max8997->i2c = i2c;
-        max8997->type = id->driver_data;
+        max8997->type = max8997_i2c_get_driver_data(i2c, id);
         max8997->irq = i2c->irq;
 
+        if (max8997->dev->of_node) {
+                pdata = max8997_i2c_parse_dt_pdata(max8997->dev);
+                if (IS_ERR(pdata)) {
+                        ret = PTR_ERR(pdata);
+                        goto err;
+                }
+        }
+
         if (!pdata)
                 goto err;
 
+        max8997->pdata = pdata;
         max8997->ono = pdata->ono;
 
         mutex_init(&max8997->iolock);
@@ -434,6 +504,7 @@ static struct i2c_driver max8997_i2c_driver = {
                    .name = "max8997",
                    .owner = THIS_MODULE,
                    .pm = &max8997_pm,
+                   .of_match_table = of_match_ptr(max8997_pmic_dt_match),
         },
         .probe = max8997_i2c_probe,
         .remove = max8997_i2c_remove,
diff --git a/drivers/regulator/max8997.c b/drivers/regulator/max8997.c
index 64cf2ee38f6c..b56c4326853d 100644
--- a/drivers/regulator/max8997.c
+++ b/drivers/regulator/max8997.c
@@ -24,6 +24,7 @@
 #include <linux/bug.h>
 #include <linux/err.h>
 #include <linux/gpio.h>
+#include <linux/of_gpio.h>
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
@@ -31,6 +32,7 @@
 #include <linux/regulator/machine.h>
 #include <linux/mfd/max8997.h>
 #include <linux/mfd/max8997-private.h>
+#include <linux/regulator/of_regulator.h>
 
 struct max8997_data {
         struct device *dev;
@@ -933,10 +935,145 @@ static struct regulator_desc regulators[] = {
                                   max8997_charger_fixedstate_ops),
 };
 
+#ifdef CONFIG_OF
+static int max8997_pmic_dt_parse_dvs_gpio(struct max8997_dev *iodev,
+                        struct max8997_platform_data *pdata,
+                        struct device_node *pmic_np)
+{
+        int i, gpio;
+
+        for (i = 0; i < 3; i++) {
+                gpio = of_get_named_gpio(pmic_np,
+                                        "max8997,pmic-buck125-dvs-gpios", i);
+                if (!gpio_is_valid(gpio)) {
+                        dev_err(iodev->dev, "invalid gpio[%d]: %d\n", i, gpio);
+                        return -EINVAL;
+                }
+                pdata->buck125_gpios[i] = gpio;
+        }
+        return 0;
+}
+
+static int max8997_pmic_dt_parse_pdata(struct max8997_dev *iodev,
+                                        struct max8997_platform_data *pdata)
+{
+        struct device_node *pmic_np, *regulators_np, *reg_np;
+        struct max8997_regulator_data *rdata;
+        unsigned int i, dvs_voltage_nr = 1, ret;
+
+        pmic_np = iodev->dev->of_node;
+        if (!pmic_np) {
+                dev_err(iodev->dev, "could not find pmic sub-node\n");
+                return -ENODEV;
+        }
+
+        regulators_np = of_find_node_by_name(pmic_np, "regulators");
+        if (!regulators_np) {
+                dev_err(iodev->dev, "could not find regulators sub-node\n");
+                return -EINVAL;
+        }
+
+        /* count the number of regulators to be supported in pmic */
+        pdata->num_regulators = 0;
+        for_each_child_of_node(regulators_np, reg_np)
+                pdata->num_regulators++;
+
+        rdata = devm_kzalloc(iodev->dev, sizeof(*rdata) *
+                                pdata->num_regulators, GFP_KERNEL);
+        if (!rdata) {
+                dev_err(iodev->dev, "could not allocate memory for "
+                                                "regulator data\n");
+                return -ENOMEM;
+        }
+
+        pdata->regulators = rdata;
+        for_each_child_of_node(regulators_np, reg_np) {
+                for (i = 0; i < ARRAY_SIZE(regulators); i++)
+                        if (!of_node_cmp(reg_np->name, regulators[i].name))
+                                break;
+
+                if (i == ARRAY_SIZE(regulators)) {
+                        dev_warn(iodev->dev, "don't know how to configure "
+                                "regulator %s\n", reg_np->name);
+                        continue;
+                }
+
+                rdata->id = i;
+                rdata->initdata = of_get_regulator_init_data(
+                                                iodev->dev, reg_np);
+                rdata->reg_node = reg_np;
+                rdata++;
+        }
+
+        if (of_get_property(pmic_np, "max8997,pmic-buck1-uses-gpio-dvs", NULL))
+                pdata->buck1_gpiodvs = true;
+
+        if (of_get_property(pmic_np, "max8997,pmic-buck2-uses-gpio-dvs", NULL))
+                pdata->buck2_gpiodvs = true;
+
+        if (of_get_property(pmic_np, "max8997,pmic-buck5-uses-gpio-dvs", NULL))
+                pdata->buck5_gpiodvs = true;
+
+        if (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
+                                                pdata->buck5_gpiodvs) {
+                ret = max8997_pmic_dt_parse_dvs_gpio(iodev, pdata, pmic_np);
+                if (ret)
+                        return -EINVAL;
+
+                if (of_property_read_u32(pmic_np,
+                                "max8997,pmic-buck125-default-dvs-idx",
+                                &pdata->buck125_default_idx)) {
+                        pdata->buck125_default_idx = 0;
+                } else {
+                        if (pdata->buck125_default_idx >= 8) {
+                                pdata->buck125_default_idx = 0;
+                                dev_info(iodev->dev, "invalid value for "
+                                "default dvs index, using 0 instead\n");
+                        }
+                }
+
+                if (of_get_property(pmic_np,
+                        "max8997,pmic-ignore-gpiodvs-side-effect", NULL))
+                        pdata->ignore_gpiodvs_side_effect = true;
+
+                dvs_voltage_nr = 8;
+        }
+
+        if (of_property_read_u32_array(pmic_np,
+                                "max8997,pmic-buck1-dvs-voltage",
+                                pdata->buck1_voltage, dvs_voltage_nr)) {
+                dev_err(iodev->dev, "buck1 voltages not specified\n");
+                return -EINVAL;
+        }
+
+        if (of_property_read_u32_array(pmic_np,
+                                "max8997,pmic-buck2-dvs-voltage",
+                                pdata->buck2_voltage, dvs_voltage_nr)) {
+                dev_err(iodev->dev, "buck2 voltages not specified\n");
+                return -EINVAL;
+        }
+
+        if (of_property_read_u32_array(pmic_np,
+                                "max8997,pmic-buck5-dvs-voltage",
+                                pdata->buck5_voltage, dvs_voltage_nr)) {
+                dev_err(iodev->dev, "buck5 voltages not specified\n");
+                return -EINVAL;
+        }
+
+        return 0;
+}
+#else
+static int max8997_pmic_dt_parse_pdata(struct max8997_dev *iodev,
+                                        struct max8997_platform_data *pdata)
+{
+        return 0;
+}
+#endif /* CONFIG_OF */
+
 static __devinit int max8997_pmic_probe(struct platform_device *pdev)
 {
         struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
-        struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
+        struct max8997_platform_data *pdata = iodev->pdata;
         struct regulator_config config = { };
         struct regulator_dev **rdev;
         struct max8997_data *max8997;
@@ -944,11 +1081,17 @@ static __devinit int max8997_pmic_probe(struct platform_device *pdev)
         int i, ret, size, nr_dvs;
         u8 max_buck1 = 0, max_buck2 = 0, max_buck5 = 0;
 
-        if (!pdata) {
+        if (IS_ERR_OR_NULL(pdata)) {
                 dev_err(pdev->dev.parent, "No platform init data supplied.\n");
                 return -ENODEV;
         }
 
+        if (iodev->dev->of_node) {
+                ret = max8997_pmic_dt_parse_pdata(iodev, pdata);
+                if (ret)
+                        return ret;
+        }
+
         max8997 = devm_kzalloc(&pdev->dev, sizeof(struct max8997_data),
                                GFP_KERNEL);
         if (!max8997)
@@ -1104,6 +1247,7 @@ static __devinit int max8997_pmic_probe(struct platform_device *pdev)
                 config.dev = max8997->dev;
                 config.init_data = pdata->regulators[i].initdata;
                 config.driver_data = max8997;
+                config.of_node = pdata->regulators[i].reg_node;
 
                 rdev[i] = regulator_register(&regulators[id], &config);
                 if (IS_ERR(rdev[i])) {
diff --git a/include/linux/mfd/max8997-private.h b/include/linux/mfd/max8997-private.h
index 830152cfae33..6ae21bf47d64 100644
--- a/include/linux/mfd/max8997-private.h
+++ b/include/linux/mfd/max8997-private.h
@@ -316,6 +316,7 @@ enum max8997_irq {
 #define MAX8997_NUM_GPIO        12
 struct max8997_dev {
         struct device *dev;
+        struct max8997_platform_data *pdata;
         struct i2c_client *i2c; /* 0xcc / PMIC, Battery Control, and FLASH */
         struct i2c_client *rtc; /* slave addr 0x0c */
         struct i2c_client *haptic; /* slave addr 0x90 */
diff --git a/include/linux/mfd/max8997.h b/include/linux/mfd/max8997.h
index 328d8e24b533..1d4a4fe6ac33 100644
--- a/include/linux/mfd/max8997.h
+++ b/include/linux/mfd/max8997.h
@@ -75,6 +75,7 @@ enum max8998_regulators {
 struct max8997_regulator_data {
         int id;
         struct regulator_init_data *initdata;
+        struct device_node *reg_node;
 };
 
 enum max8997_muic_usb_type {