regulator: add device tree support for max8997

Add device tree based discovery support for max8997.

Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
Acked-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Reviewed-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 146 insertions, 2 deletions

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])) {