regulator: add device tree support for max8997

[karo-tx-linux.git] / drivers / regulator / max8997.c

diff --git a/drivers/regulator/max8997.c b/drivers/regulator/max8997.c
index 64cf2ee38f6c1ac0e6d9800881a93834cf763180..b56c4326853d0e731029718b812131dd69bfa775 100644 (file)
--- 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])) {