v4.19.13 snapshot.
diff --git a/drivers/regulator/max8998.c b/drivers/regulator/max8998.c
new file mode 100644
index 0000000..271bb73
--- /dev/null
+++ b/drivers/regulator/max8998.c
@@ -0,0 +1,903 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// max8998.c - Voltage regulator driver for the Maxim 8998
+//
+// Copyright (C) 2009-2010 Samsung Electronics
+// Kyungmin Park <kyungmin.park@samsung.com>
+// Marek Szyprowski <m.szyprowski@samsung.com>
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/mfd/max8998.h>
+#include <linux/mfd/max8998-private.h>
+
+struct max8998_data {
+ struct device *dev;
+ struct max8998_dev *iodev;
+ int num_regulators;
+ u8 buck1_vol[4]; /* voltages for selection */
+ u8 buck2_vol[2];
+ unsigned int buck1_idx; /* index to last changed voltage */
+ /* value in a set */
+ unsigned int buck2_idx;
+};
+
+struct voltage_map_desc {
+ int min;
+ int max;
+ int step;
+};
+
+/* Voltage maps in uV*/
+static const struct voltage_map_desc ldo23_voltage_map_desc = {
+ .min = 800000, .step = 50000, .max = 1300000,
+};
+static const struct voltage_map_desc ldo456711_voltage_map_desc = {
+ .min = 1600000, .step = 100000, .max = 3600000,
+};
+static const struct voltage_map_desc ldo8_voltage_map_desc = {
+ .min = 3000000, .step = 100000, .max = 3600000,
+};
+static const struct voltage_map_desc ldo9_voltage_map_desc = {
+ .min = 2800000, .step = 100000, .max = 3100000,
+};
+static const struct voltage_map_desc ldo10_voltage_map_desc = {
+ .min = 950000, .step = 50000, .max = 1300000,
+};
+static const struct voltage_map_desc ldo1213_voltage_map_desc = {
+ .min = 800000, .step = 100000, .max = 3300000,
+};
+static const struct voltage_map_desc ldo1415_voltage_map_desc = {
+ .min = 1200000, .step = 100000, .max = 3300000,
+};
+static const struct voltage_map_desc ldo1617_voltage_map_desc = {
+ .min = 1600000, .step = 100000, .max = 3600000,
+};
+static const struct voltage_map_desc buck12_voltage_map_desc = {
+ .min = 750000, .step = 25000, .max = 1525000,
+};
+static const struct voltage_map_desc buck3_voltage_map_desc = {
+ .min = 1600000, .step = 100000, .max = 3600000,
+};
+static const struct voltage_map_desc buck4_voltage_map_desc = {
+ .min = 800000, .step = 100000, .max = 2300000,
+};
+
+static const struct voltage_map_desc *ldo_voltage_map[] = {
+ NULL,
+ NULL,
+ &ldo23_voltage_map_desc, /* LDO2 */
+ &ldo23_voltage_map_desc, /* LDO3 */
+ &ldo456711_voltage_map_desc, /* LDO4 */
+ &ldo456711_voltage_map_desc, /* LDO5 */
+ &ldo456711_voltage_map_desc, /* LDO6 */
+ &ldo456711_voltage_map_desc, /* LDO7 */
+ &ldo8_voltage_map_desc, /* LDO8 */
+ &ldo9_voltage_map_desc, /* LDO9 */
+ &ldo10_voltage_map_desc, /* LDO10 */
+ &ldo456711_voltage_map_desc, /* LDO11 */
+ &ldo1213_voltage_map_desc, /* LDO12 */
+ &ldo1213_voltage_map_desc, /* LDO13 */
+ &ldo1415_voltage_map_desc, /* LDO14 */
+ &ldo1415_voltage_map_desc, /* LDO15 */
+ &ldo1617_voltage_map_desc, /* LDO16 */
+ &ldo1617_voltage_map_desc, /* LDO17 */
+ &buck12_voltage_map_desc, /* BUCK1 */
+ &buck12_voltage_map_desc, /* BUCK2 */
+ &buck3_voltage_map_desc, /* BUCK3 */
+ &buck4_voltage_map_desc, /* BUCK4 */
+};
+
+static int max8998_get_enable_register(struct regulator_dev *rdev,
+ int *reg, int *shift)
+{
+ int ldo = rdev_get_id(rdev);
+
+ switch (ldo) {
+ case MAX8998_LDO2 ... MAX8998_LDO5:
+ *reg = MAX8998_REG_ONOFF1;
+ *shift = 3 - (ldo - MAX8998_LDO2);
+ break;
+ case MAX8998_LDO6 ... MAX8998_LDO13:
+ *reg = MAX8998_REG_ONOFF2;
+ *shift = 7 - (ldo - MAX8998_LDO6);
+ break;
+ case MAX8998_LDO14 ... MAX8998_LDO17:
+ *reg = MAX8998_REG_ONOFF3;
+ *shift = 7 - (ldo - MAX8998_LDO14);
+ break;
+ case MAX8998_BUCK1 ... MAX8998_BUCK4:
+ *reg = MAX8998_REG_ONOFF1;
+ *shift = 7 - (ldo - MAX8998_BUCK1);
+ break;
+ case MAX8998_EN32KHZ_AP ... MAX8998_ENVICHG:
+ *reg = MAX8998_REG_ONOFF4;
+ *shift = 7 - (ldo - MAX8998_EN32KHZ_AP);
+ break;
+ case MAX8998_ESAFEOUT1 ... MAX8998_ESAFEOUT2:
+ *reg = MAX8998_REG_CHGR2;
+ *shift = 7 - (ldo - MAX8998_ESAFEOUT1);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int max8998_ldo_is_enabled(struct regulator_dev *rdev)
+{
+ struct max8998_data *max8998 = rdev_get_drvdata(rdev);
+ struct i2c_client *i2c = max8998->iodev->i2c;
+ int ret, reg, shift = 8;
+ u8 val;
+
+ ret = max8998_get_enable_register(rdev, ®, &shift);
+ if (ret)
+ return ret;
+
+ ret = max8998_read_reg(i2c, reg, &val);
+ if (ret)
+ return ret;
+
+ return val & (1 << shift);
+}
+
+static int max8998_ldo_enable(struct regulator_dev *rdev)
+{
+ struct max8998_data *max8998 = rdev_get_drvdata(rdev);
+ struct i2c_client *i2c = max8998->iodev->i2c;
+ int reg, shift = 8, ret;
+
+ ret = max8998_get_enable_register(rdev, ®, &shift);
+ if (ret)
+ return ret;
+
+ return max8998_update_reg(i2c, reg, 1<<shift, 1<<shift);
+}
+
+static int max8998_ldo_disable(struct regulator_dev *rdev)
+{
+ struct max8998_data *max8998 = rdev_get_drvdata(rdev);
+ struct i2c_client *i2c = max8998->iodev->i2c;
+ int reg, shift = 8, ret;
+
+ ret = max8998_get_enable_register(rdev, ®, &shift);
+ if (ret)
+ return ret;
+
+ return max8998_update_reg(i2c, reg, 0, 1<<shift);
+}
+
+static int max8998_get_voltage_register(struct regulator_dev *rdev,
+ int *_reg, int *_shift, int *_mask)
+{
+ int ldo = rdev_get_id(rdev);
+ struct max8998_data *max8998 = rdev_get_drvdata(rdev);
+ int reg, shift = 0, mask = 0xff;
+
+ switch (ldo) {
+ case MAX8998_LDO2 ... MAX8998_LDO3:
+ reg = MAX8998_REG_LDO2_LDO3;
+ mask = 0xf;
+ if (ldo == MAX8998_LDO2)
+ shift = 4;
+ else
+ shift = 0;
+ break;
+ case MAX8998_LDO4 ... MAX8998_LDO7:
+ reg = MAX8998_REG_LDO4 + (ldo - MAX8998_LDO4);
+ break;
+ case MAX8998_LDO8 ... MAX8998_LDO9:
+ reg = MAX8998_REG_LDO8_LDO9;
+ mask = 0xf;
+ if (ldo == MAX8998_LDO8)
+ shift = 4;
+ else
+ shift = 0;
+ break;
+ case MAX8998_LDO10 ... MAX8998_LDO11:
+ reg = MAX8998_REG_LDO10_LDO11;
+ if (ldo == MAX8998_LDO10) {
+ shift = 5;
+ mask = 0x7;
+ } else {
+ shift = 0;
+ mask = 0x1f;
+ }
+ break;
+ case MAX8998_LDO12 ... MAX8998_LDO17:
+ reg = MAX8998_REG_LDO12 + (ldo - MAX8998_LDO12);
+ break;
+ case MAX8998_BUCK1:
+ reg = MAX8998_REG_BUCK1_VOLTAGE1 + max8998->buck1_idx;
+ break;
+ case MAX8998_BUCK2:
+ reg = MAX8998_REG_BUCK2_VOLTAGE1 + max8998->buck2_idx;
+ break;
+ case MAX8998_BUCK3:
+ reg = MAX8998_REG_BUCK3;
+ break;
+ case MAX8998_BUCK4:
+ reg = MAX8998_REG_BUCK4;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ *_reg = reg;
+ *_shift = shift;
+ *_mask = mask;
+
+ return 0;
+}
+
+static int max8998_get_voltage_sel(struct regulator_dev *rdev)
+{
+ struct max8998_data *max8998 = rdev_get_drvdata(rdev);
+ struct i2c_client *i2c = max8998->iodev->i2c;
+ int reg, shift = 0, mask, ret;
+ u8 val;
+
+ ret = max8998_get_voltage_register(rdev, ®, &shift, &mask);
+ if (ret)
+ return ret;
+
+ ret = max8998_read_reg(i2c, reg, &val);
+ if (ret)
+ return ret;
+
+ val >>= shift;
+ val &= mask;
+
+ return val;
+}
+
+static int max8998_set_voltage_ldo_sel(struct regulator_dev *rdev,
+ unsigned selector)
+{
+ struct max8998_data *max8998 = rdev_get_drvdata(rdev);
+ struct i2c_client *i2c = max8998->iodev->i2c;
+ int reg, shift = 0, mask, ret;
+
+ ret = max8998_get_voltage_register(rdev, ®, &shift, &mask);
+ if (ret)
+ return ret;
+
+ ret = max8998_update_reg(i2c, reg, selector<<shift, mask<<shift);
+
+ return ret;
+}
+
+static inline void buck1_gpio_set(int gpio1, int gpio2, int v)
+{
+ gpio_set_value(gpio1, v & 0x1);
+ gpio_set_value(gpio2, (v >> 1) & 0x1);
+}
+
+static inline void buck2_gpio_set(int gpio, int v)
+{
+ gpio_set_value(gpio, v & 0x1);
+}
+
+static int max8998_set_voltage_buck_sel(struct regulator_dev *rdev,
+ unsigned selector)
+{
+ struct max8998_data *max8998 = rdev_get_drvdata(rdev);
+ struct max8998_platform_data *pdata = max8998->iodev->pdata;
+ struct i2c_client *i2c = max8998->iodev->i2c;
+ int buck = rdev_get_id(rdev);
+ int reg, shift = 0, mask, ret, j;
+ static u8 buck1_last_val;
+
+ ret = max8998_get_voltage_register(rdev, ®, &shift, &mask);
+ if (ret)
+ return ret;
+
+ switch (buck) {
+ case MAX8998_BUCK1:
+ dev_dbg(max8998->dev,
+ "BUCK1, selector:%d, buck1_vol1:%d, buck1_vol2:%d\n"
+ "buck1_vol3:%d, buck1_vol4:%d\n",
+ selector, max8998->buck1_vol[0], max8998->buck1_vol[1],
+ max8998->buck1_vol[2], max8998->buck1_vol[3]);
+
+ if (gpio_is_valid(pdata->buck1_set1) &&
+ gpio_is_valid(pdata->buck1_set2)) {
+
+ /* check if requested voltage */
+ /* value is already defined */
+ for (j = 0; j < ARRAY_SIZE(max8998->buck1_vol); j++) {
+ if (max8998->buck1_vol[j] == selector) {
+ max8998->buck1_idx = j;
+ buck1_gpio_set(pdata->buck1_set1,
+ pdata->buck1_set2, j);
+ goto buck1_exit;
+ }
+ }
+
+ if (pdata->buck_voltage_lock)
+ return -EINVAL;
+
+ /* no predefine regulator found */
+ max8998->buck1_idx = (buck1_last_val % 2) + 2;
+ dev_dbg(max8998->dev, "max8998->buck1_idx:%d\n",
+ max8998->buck1_idx);
+ max8998->buck1_vol[max8998->buck1_idx] = selector;
+ ret = max8998_get_voltage_register(rdev, ®,
+ &shift,
+ &mask);
+ ret = max8998_write_reg(i2c, reg, selector);
+ buck1_gpio_set(pdata->buck1_set1,
+ pdata->buck1_set2, max8998->buck1_idx);
+ buck1_last_val++;
+buck1_exit:
+ dev_dbg(max8998->dev, "%s: SET1:%d, SET2:%d\n",
+ i2c->name, gpio_get_value(pdata->buck1_set1),
+ gpio_get_value(pdata->buck1_set2));
+ break;
+ } else {
+ ret = max8998_write_reg(i2c, reg, selector);
+ }
+ break;
+
+ case MAX8998_BUCK2:
+ dev_dbg(max8998->dev,
+ "BUCK2, selector:%d buck2_vol1:%d, buck2_vol2:%d\n",
+ selector, max8998->buck2_vol[0], max8998->buck2_vol[1]);
+ if (gpio_is_valid(pdata->buck2_set3)) {
+
+ /* check if requested voltage */
+ /* value is already defined */
+ for (j = 0; j < ARRAY_SIZE(max8998->buck2_vol); j++) {
+ if (max8998->buck2_vol[j] == selector) {
+ max8998->buck2_idx = j;
+ buck2_gpio_set(pdata->buck2_set3, j);
+ goto buck2_exit;
+ }
+ }
+
+ if (pdata->buck_voltage_lock)
+ return -EINVAL;
+
+ max8998_get_voltage_register(rdev,
+ ®, &shift, &mask);
+ ret = max8998_write_reg(i2c, reg, selector);
+ max8998->buck2_vol[max8998->buck2_idx] = selector;
+ buck2_gpio_set(pdata->buck2_set3, max8998->buck2_idx);
+buck2_exit:
+ dev_dbg(max8998->dev, "%s: SET3:%d\n", i2c->name,
+ gpio_get_value(pdata->buck2_set3));
+ } else {
+ ret = max8998_write_reg(i2c, reg, selector);
+ }
+ break;
+
+ case MAX8998_BUCK3:
+ case MAX8998_BUCK4:
+ ret = max8998_update_reg(i2c, reg, selector<<shift,
+ mask<<shift);
+ break;
+ }
+
+ return ret;
+}
+
+static int max8998_set_voltage_buck_time_sel(struct regulator_dev *rdev,
+ unsigned int old_selector,
+ unsigned int new_selector)
+{
+ struct max8998_data *max8998 = rdev_get_drvdata(rdev);
+ struct i2c_client *i2c = max8998->iodev->i2c;
+ const struct voltage_map_desc *desc;
+ int buck = rdev_get_id(rdev);
+ u8 val = 0;
+ int difference, ret;
+
+ if (buck < MAX8998_BUCK1 || buck > MAX8998_BUCK4)
+ return -EINVAL;
+
+ desc = ldo_voltage_map[buck];
+
+ /* Voltage stabilization */
+ ret = max8998_read_reg(i2c, MAX8998_REG_ONOFF4, &val);
+ if (ret)
+ return ret;
+
+ /* lp3974 hasn't got ENRAMP bit - ramp is assumed as true */
+ /* MAX8998 has ENRAMP bit implemented, so test it*/
+ if (max8998->iodev->type == TYPE_MAX8998 && !(val & MAX8998_ENRAMP))
+ return 0;
+
+ difference = (new_selector - old_selector) * desc->step / 1000;
+ if (difference > 0)
+ return DIV_ROUND_UP(difference, (val & 0x0f) + 1);
+
+ return 0;
+}
+
+static struct regulator_ops max8998_ldo_ops = {
+ .list_voltage = regulator_list_voltage_linear,
+ .map_voltage = regulator_map_voltage_linear,
+ .is_enabled = max8998_ldo_is_enabled,
+ .enable = max8998_ldo_enable,
+ .disable = max8998_ldo_disable,
+ .get_voltage_sel = max8998_get_voltage_sel,
+ .set_voltage_sel = max8998_set_voltage_ldo_sel,
+};
+
+static struct regulator_ops max8998_buck_ops = {
+ .list_voltage = regulator_list_voltage_linear,
+ .map_voltage = regulator_map_voltage_linear,
+ .is_enabled = max8998_ldo_is_enabled,
+ .enable = max8998_ldo_enable,
+ .disable = max8998_ldo_disable,
+ .get_voltage_sel = max8998_get_voltage_sel,
+ .set_voltage_sel = max8998_set_voltage_buck_sel,
+ .set_voltage_time_sel = max8998_set_voltage_buck_time_sel,
+};
+
+static struct regulator_ops max8998_others_ops = {
+ .is_enabled = max8998_ldo_is_enabled,
+ .enable = max8998_ldo_enable,
+ .disable = max8998_ldo_disable,
+};
+
+static struct regulator_desc regulators[] = {
+ {
+ .name = "LDO2",
+ .id = MAX8998_LDO2,
+ .ops = &max8998_ldo_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "LDO3",
+ .id = MAX8998_LDO3,
+ .ops = &max8998_ldo_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "LDO4",
+ .id = MAX8998_LDO4,
+ .ops = &max8998_ldo_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "LDO5",
+ .id = MAX8998_LDO5,
+ .ops = &max8998_ldo_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "LDO6",
+ .id = MAX8998_LDO6,
+ .ops = &max8998_ldo_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "LDO7",
+ .id = MAX8998_LDO7,
+ .ops = &max8998_ldo_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "LDO8",
+ .id = MAX8998_LDO8,
+ .ops = &max8998_ldo_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "LDO9",
+ .id = MAX8998_LDO9,
+ .ops = &max8998_ldo_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "LDO10",
+ .id = MAX8998_LDO10,
+ .ops = &max8998_ldo_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "LDO11",
+ .id = MAX8998_LDO11,
+ .ops = &max8998_ldo_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "LDO12",
+ .id = MAX8998_LDO12,
+ .ops = &max8998_ldo_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "LDO13",
+ .id = MAX8998_LDO13,
+ .ops = &max8998_ldo_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "LDO14",
+ .id = MAX8998_LDO14,
+ .ops = &max8998_ldo_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "LDO15",
+ .id = MAX8998_LDO15,
+ .ops = &max8998_ldo_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "LDO16",
+ .id = MAX8998_LDO16,
+ .ops = &max8998_ldo_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "LDO17",
+ .id = MAX8998_LDO17,
+ .ops = &max8998_ldo_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "BUCK1",
+ .id = MAX8998_BUCK1,
+ .ops = &max8998_buck_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "BUCK2",
+ .id = MAX8998_BUCK2,
+ .ops = &max8998_buck_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "BUCK3",
+ .id = MAX8998_BUCK3,
+ .ops = &max8998_buck_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "BUCK4",
+ .id = MAX8998_BUCK4,
+ .ops = &max8998_buck_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "EN32KHz-AP",
+ .id = MAX8998_EN32KHZ_AP,
+ .ops = &max8998_others_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "EN32KHz-CP",
+ .id = MAX8998_EN32KHZ_CP,
+ .ops = &max8998_others_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "ENVICHG",
+ .id = MAX8998_ENVICHG,
+ .ops = &max8998_others_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "ESAFEOUT1",
+ .id = MAX8998_ESAFEOUT1,
+ .ops = &max8998_others_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "ESAFEOUT2",
+ .id = MAX8998_ESAFEOUT2,
+ .ops = &max8998_others_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }
+};
+
+static int max8998_pmic_dt_parse_dvs_gpio(struct max8998_dev *iodev,
+ struct max8998_platform_data *pdata,
+ struct device_node *pmic_np)
+{
+ int gpio;
+
+ gpio = of_get_named_gpio(pmic_np, "max8998,pmic-buck1-dvs-gpios", 0);
+ if (!gpio_is_valid(gpio)) {
+ dev_err(iodev->dev, "invalid buck1 gpio[0]: %d\n", gpio);
+ return -EINVAL;
+ }
+ pdata->buck1_set1 = gpio;
+
+ gpio = of_get_named_gpio(pmic_np, "max8998,pmic-buck1-dvs-gpios", 1);
+ if (!gpio_is_valid(gpio)) {
+ dev_err(iodev->dev, "invalid buck1 gpio[1]: %d\n", gpio);
+ return -EINVAL;
+ }
+ pdata->buck1_set2 = gpio;
+
+ gpio = of_get_named_gpio(pmic_np, "max8998,pmic-buck2-dvs-gpio", 0);
+ if (!gpio_is_valid(gpio)) {
+ dev_err(iodev->dev, "invalid buck 2 gpio: %d\n", gpio);
+ return -EINVAL;
+ }
+ pdata->buck2_set3 = gpio;
+
+ return 0;
+}
+
+static int max8998_pmic_dt_parse_pdata(struct max8998_dev *iodev,
+ struct max8998_platform_data *pdata)
+{
+ struct device_node *pmic_np = iodev->dev->of_node;
+ struct device_node *regulators_np, *reg_np;
+ struct max8998_regulator_data *rdata;
+ unsigned int i;
+ int ret;
+
+ regulators_np = of_get_child_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 = of_get_child_count(regulators_np);
+
+ rdata = devm_kcalloc(iodev->dev,
+ pdata->num_regulators, sizeof(*rdata),
+ GFP_KERNEL);
+ if (!rdata) {
+ of_node_put(regulators_np);
+ return -ENOMEM;
+ }
+
+ pdata->regulators = rdata;
+ for (i = 0; i < ARRAY_SIZE(regulators); ++i) {
+ reg_np = of_get_child_by_name(regulators_np,
+ regulators[i].name);
+ if (!reg_np)
+ continue;
+
+ rdata->id = regulators[i].id;
+ rdata->initdata = of_get_regulator_init_data(iodev->dev,
+ reg_np,
+ ®ulators[i]);
+ rdata->reg_node = reg_np;
+ ++rdata;
+ }
+ pdata->num_regulators = rdata - pdata->regulators;
+
+ of_node_put(reg_np);
+ of_node_put(regulators_np);
+
+ ret = max8998_pmic_dt_parse_dvs_gpio(iodev, pdata, pmic_np);
+ if (ret)
+ return -EINVAL;
+
+ if (of_find_property(pmic_np, "max8998,pmic-buck-voltage-lock", NULL))
+ pdata->buck_voltage_lock = true;
+
+ ret = of_property_read_u32(pmic_np,
+ "max8998,pmic-buck1-default-dvs-idx",
+ &pdata->buck1_default_idx);
+ if (!ret && pdata->buck1_default_idx >= 4) {
+ pdata->buck1_default_idx = 0;
+ dev_warn(iodev->dev, "invalid value for default dvs index, using 0 instead\n");
+ }
+
+ ret = of_property_read_u32(pmic_np,
+ "max8998,pmic-buck2-default-dvs-idx",
+ &pdata->buck2_default_idx);
+ if (!ret && pdata->buck2_default_idx >= 2) {
+ pdata->buck2_default_idx = 0;
+ dev_warn(iodev->dev, "invalid value for default dvs index, using 0 instead\n");
+ }
+
+ ret = of_property_read_u32_array(pmic_np,
+ "max8998,pmic-buck1-dvs-voltage",
+ pdata->buck1_voltage,
+ ARRAY_SIZE(pdata->buck1_voltage));
+ if (ret) {
+ dev_err(iodev->dev, "buck1 voltages not specified\n");
+ return -EINVAL;
+ }
+
+ ret = of_property_read_u32_array(pmic_np,
+ "max8998,pmic-buck2-dvs-voltage",
+ pdata->buck2_voltage,
+ ARRAY_SIZE(pdata->buck2_voltage));
+ if (ret) {
+ dev_err(iodev->dev, "buck2 voltages not specified\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int max8998_pmic_probe(struct platform_device *pdev)
+{
+ struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent);
+ struct max8998_platform_data *pdata = iodev->pdata;
+ struct regulator_config config = { };
+ struct regulator_dev *rdev;
+ struct max8998_data *max8998;
+ struct i2c_client *i2c;
+ int i, ret;
+ unsigned int v;
+
+ if (!pdata) {
+ dev_err(pdev->dev.parent, "No platform init data supplied\n");
+ return -ENODEV;
+ }
+
+ if (IS_ENABLED(CONFIG_OF) && iodev->dev->of_node) {
+ ret = max8998_pmic_dt_parse_pdata(iodev, pdata);
+ if (ret)
+ return ret;
+ }
+
+ max8998 = devm_kzalloc(&pdev->dev, sizeof(struct max8998_data),
+ GFP_KERNEL);
+ if (!max8998)
+ return -ENOMEM;
+
+ max8998->dev = &pdev->dev;
+ max8998->iodev = iodev;
+ max8998->num_regulators = pdata->num_regulators;
+ platform_set_drvdata(pdev, max8998);
+ i2c = max8998->iodev->i2c;
+
+ max8998->buck1_idx = pdata->buck1_default_idx;
+ max8998->buck2_idx = pdata->buck2_default_idx;
+
+ /* NOTE: */
+ /* For unused GPIO NOT marked as -1 (thereof equal to 0) WARN_ON */
+ /* will be displayed */
+
+ /* Check if MAX8998 voltage selection GPIOs are defined */
+ if (gpio_is_valid(pdata->buck1_set1) &&
+ gpio_is_valid(pdata->buck1_set2)) {
+ /* Check if SET1 is not equal to 0 */
+ if (!pdata->buck1_set1) {
+ dev_err(&pdev->dev,
+ "MAX8998 SET1 GPIO defined as 0 !\n");
+ WARN_ON(!pdata->buck1_set1);
+ return -EIO;
+ }
+ /* Check if SET2 is not equal to 0 */
+ if (!pdata->buck1_set2) {
+ dev_err(&pdev->dev,
+ "MAX8998 SET2 GPIO defined as 0 !\n");
+ WARN_ON(!pdata->buck1_set2);
+ return -EIO;
+ }
+
+ gpio_request(pdata->buck1_set1, "MAX8998 BUCK1_SET1");
+ gpio_direction_output(pdata->buck1_set1,
+ max8998->buck1_idx & 0x1);
+
+
+ gpio_request(pdata->buck1_set2, "MAX8998 BUCK1_SET2");
+ gpio_direction_output(pdata->buck1_set2,
+ (max8998->buck1_idx >> 1) & 0x1);
+
+ /* Set predefined values for BUCK1 registers */
+ for (v = 0; v < ARRAY_SIZE(pdata->buck1_voltage); ++v) {
+ i = 0;
+ while (buck12_voltage_map_desc.min +
+ buck12_voltage_map_desc.step*i
+ < pdata->buck1_voltage[v])
+ i++;
+
+ max8998->buck1_vol[v] = i;
+ ret = max8998_write_reg(i2c,
+ MAX8998_REG_BUCK1_VOLTAGE1 + v, i);
+ if (ret)
+ return ret;
+ }
+ }
+
+ if (gpio_is_valid(pdata->buck2_set3)) {
+ /* Check if SET3 is not equal to 0 */
+ if (!pdata->buck2_set3) {
+ dev_err(&pdev->dev,
+ "MAX8998 SET3 GPIO defined as 0 !\n");
+ WARN_ON(!pdata->buck2_set3);
+ return -EIO;
+ }
+ gpio_request(pdata->buck2_set3, "MAX8998 BUCK2_SET3");
+ gpio_direction_output(pdata->buck2_set3,
+ max8998->buck2_idx & 0x1);
+
+ /* Set predefined values for BUCK2 registers */
+ for (v = 0; v < ARRAY_SIZE(pdata->buck2_voltage); ++v) {
+ i = 0;
+ while (buck12_voltage_map_desc.min +
+ buck12_voltage_map_desc.step*i
+ < pdata->buck2_voltage[v])
+ i++;
+
+ max8998->buck2_vol[v] = i;
+ ret = max8998_write_reg(i2c,
+ MAX8998_REG_BUCK2_VOLTAGE1 + v, i);
+ if (ret)
+ return ret;
+ }
+ }
+
+ for (i = 0; i < pdata->num_regulators; i++) {
+ const struct voltage_map_desc *desc;
+ int id = pdata->regulators[i].id;
+ int index = id - MAX8998_LDO2;
+
+ desc = ldo_voltage_map[id];
+ if (desc && regulators[index].ops != &max8998_others_ops) {
+ int count = (desc->max - desc->min) / desc->step + 1;
+
+ regulators[index].n_voltages = count;
+ regulators[index].min_uV = desc->min;
+ regulators[index].uV_step = desc->step;
+ }
+
+ config.dev = max8998->dev;
+ config.of_node = pdata->regulators[i].reg_node;
+ config.init_data = pdata->regulators[i].initdata;
+ config.driver_data = max8998;
+
+ rdev = devm_regulator_register(&pdev->dev, ®ulators[index],
+ &config);
+ if (IS_ERR(rdev)) {
+ ret = PTR_ERR(rdev);
+ dev_err(max8998->dev, "regulator %s init failed (%d)\n",
+ regulators[index].name, ret);
+ return ret;
+ }
+ }
+
+
+ return 0;
+}
+
+static const struct platform_device_id max8998_pmic_id[] = {
+ { "max8998-pmic", TYPE_MAX8998 },
+ { "lp3974-pmic", TYPE_LP3974 },
+ { }
+};
+MODULE_DEVICE_TABLE(platform, max8998_pmic_id);
+
+static struct platform_driver max8998_pmic_driver = {
+ .driver = {
+ .name = "max8998-pmic",
+ },
+ .probe = max8998_pmic_probe,
+ .id_table = max8998_pmic_id,
+};
+
+static int __init max8998_pmic_init(void)
+{
+ return platform_driver_register(&max8998_pmic_driver);
+}
+subsys_initcall(max8998_pmic_init);
+
+static void __exit max8998_pmic_cleanup(void)
+{
+ platform_driver_unregister(&max8998_pmic_driver);
+}
+module_exit(max8998_pmic_cleanup);
+
+MODULE_DESCRIPTION("MAXIM 8998 voltage regulator driver");
+MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
+MODULE_LICENSE("GPL");