text: // SPDX-License-Identifier: GPL-2.0+
  //
  // Copyright (c) 2011 Samsung Electronics Co., Ltd
  //              http://www.samsung.com
  
  #include <linux/err.h>
  #include <linux/of_gpio.h>
  #include <linux/gpio/consumer.h>
  #include <linux/module.h>
  #include <linux/platform_device.h>
  #include <linux/regulator/driver.h>
  #include <linux/regulator/machine.h>
  #include <linux/mfd/samsung/core.h>
  #include <linux/mfd/samsung/s5m8767.h>
  #include <linux/regulator/of_regulator.h>
  #include <linux/regmap.h>
  
  #define S5M8767_OPMODE_NORMAL_MODE 0x1
  
  struct s5m8767_info {
  	struct device *dev;
  	struct sec_pmic_dev *iodev;
  	int num_regulators;
  	struct sec_opmode_data *opmode;
  
  	int ramp_delay;
  	bool buck2_ramp;
  	bool buck3_ramp;
  	bool buck4_ramp;
  
  	bool buck2_gpiodvs;
  	bool buck3_gpiodvs;
  	bool buck4_gpiodvs;
  	u8 buck2_vol[8];
  	u8 buck3_vol[8];
  	u8 buck4_vol[8];
  	int buck_gpios[3];
  	int buck_ds[3];
  	int buck_gpioindex;
  };
  
  struct sec_voltage_desc {
  	int max;
  	int min;
  	int step;
  };
  
  static const struct sec_voltage_desc buck_voltage_val1 = {
  	.max = 2225000,
  	.min =  650000,
  	.step =   6250,
  };
  
  static const struct sec_voltage_desc buck_voltage_val2 = {
  	.max = 1600000,
  	.min =  600000,
  	.step =   6250,
  };
  
  static const struct sec_voltage_desc buck_voltage_val3 = {
  	.max = 3000000,
  	.min =  750000,
  	.step =  12500,
  };
  
  static const struct sec_voltage_desc ldo_voltage_val1 = {
  	.max = 3950000,
  	.min =  800000,
  	.step =  50000,
  };
  
  static const struct sec_voltage_desc ldo_voltage_val2 = {
  	.max = 2375000,
  	.min =  800000,
  	.step =  25000,
  };
  
  static const struct sec_voltage_desc *reg_voltage_map[] = {
  	[S5M8767_LDO1] = &ldo_voltage_val2,
  	[S5M8767_LDO2] = &ldo_voltage_val2,
  	[S5M8767_LDO3] = &ldo_voltage_val1,
  	[S5M8767_LDO4] = &ldo_voltage_val1,
  	[S5M8767_LDO5] = &ldo_voltage_val1,
  	[S5M8767_LDO6] = &ldo_voltage_val2,
  	[S5M8767_LDO7] = &ldo_voltage_val2,
  	[S5M8767_LDO8] = &ldo_voltage_val2,
  	[S5M8767_LDO9] = &ldo_voltage_val1,
  	[S5M8767_LDO10] = &ldo_voltage_val1,
  	[S5M8767_LDO11] = &ldo_voltage_val1,
  	[S5M8767_LDO12] = &ldo_voltage_val1,
  	[S5M8767_LDO13] = &ldo_voltage_val1,
  	[S5M8767_LDO14] = &ldo_voltage_val1,
  	[S5M8767_LDO15] = &ldo_voltage_val2,
  	[S5M8767_LDO16] = &ldo_voltage_val1,
  	[S5M8767_LDO17] = &ldo_voltage_val1,
  	[S5M8767_LDO18] = &ldo_voltage_val1,
  	[S5M8767_LDO19] = &ldo_voltage_val1,
  	[S5M8767_LDO20] = &ldo_voltage_val1,
  	[S5M8767_LDO21] = &ldo_voltage_val1,
  	[S5M8767_LDO22] = &ldo_voltage_val1,
  	[S5M8767_LDO23] = &ldo_voltage_val1,
  	[S5M8767_LDO24] = &ldo_voltage_val1,
  	[S5M8767_LDO25] = &ldo_voltage_val1,
  	[S5M8767_LDO26] = &ldo_voltage_val1,
  	[S5M8767_LDO27] = &ldo_voltage_val1,
  	[S5M8767_LDO28] = &ldo_voltage_val1,
  	[S5M8767_BUCK1] = &buck_voltage_val1,
  	[S5M8767_BUCK2] = &buck_voltage_val2,
  	[S5M8767_BUCK3] = &buck_voltage_val2,
  	[S5M8767_BUCK4] = &buck_voltage_val2,
  	[S5M8767_BUCK5] = &buck_voltage_val1,
  	[S5M8767_BUCK6] = &buck_voltage_val1,
  	[S5M8767_BUCK7] = &buck_voltage_val3,
  	[S5M8767_BUCK8] = &buck_voltage_val3,
  	[S5M8767_BUCK9] = &buck_voltage_val3,
  };
  
  static const unsigned int s5m8767_opmode_reg[][4] = {
  	/* {OFF, ON, LOWPOWER, SUSPEND} */
  	/* LDO1 ... LDO28 */
  	{0x0, 0x3, 0x2, 0x1}, /* LDO1 */
  	{0x0, 0x3, 0x2, 0x1},
  	{0x0, 0x3, 0x2, 0x1},
  	{0x0, 0x0, 0x0, 0x0},
  	{0x0, 0x3, 0x2, 0x1}, /* LDO5 */
  	{0x0, 0x3, 0x2, 0x1},
  	{0x0, 0x3, 0x2, 0x1},
  	{0x0, 0x3, 0x2, 0x1},
  	{0x0, 0x3, 0x2, 0x1},
  	{0x0, 0x3, 0x2, 0x1}, /* LDO10 */
  	{0x0, 0x3, 0x2, 0x1},
  	{0x0, 0x3, 0x2, 0x1},
  	{0x0, 0x3, 0x2, 0x1},
  	{0x0, 0x3, 0x2, 0x1},
  	{0x0, 0x3, 0x2, 0x1}, /* LDO15 */
  	{0x0, 0x3, 0x2, 0x1},
  	{0x0, 0x3, 0x2, 0x1},
  	{0x0, 0x0, 0x0, 0x0},
  	{0x0, 0x3, 0x2, 0x1},
  	{0x0, 0x3, 0x2, 0x1}, /* LDO20 */
  	{0x0, 0x3, 0x2, 0x1},
  	{0x0, 0x3, 0x2, 0x1},
  	{0x0, 0x0, 0x0, 0x0},
  	{0x0, 0x3, 0x2, 0x1},
  	{0x0, 0x3, 0x2, 0x1}, /* LDO25 */
  	{0x0, 0x3, 0x2, 0x1},
  	{0x0, 0x3, 0x2, 0x1},
  	{0x0, 0x3, 0x2, 0x1}, /* LDO28 */
  
  	/* BUCK1 ... BUCK9 */
  	{0x0, 0x3, 0x1, 0x1}, /* BUCK1 */
  	{0x0, 0x3, 0x1, 0x1},
  	{0x0, 0x3, 0x1, 0x1},
  	{0x0, 0x3, 0x1, 0x1},
  	{0x0, 0x3, 0x2, 0x1}, /* BUCK5 */
  	{0x0, 0x3, 0x1, 0x1},
  	{0x0, 0x3, 0x1, 0x1},
  	{0x0, 0x3, 0x1, 0x1},
  	{0x0, 0x3, 0x1, 0x1}, /* BUCK9 */
  };
  
  static int s5m8767_get_register(struct s5m8767_info *s5m8767, int reg_id,
  				int *reg, int *enable_ctrl)
  {
  	int i;
  	unsigned int mode;
  
  	switch (reg_id) {
  	case S5M8767_LDO1 ... S5M8767_LDO2:
  		*reg = S5M8767_REG_LDO1CTRL + (reg_id - S5M8767_LDO1);
  		break;
  	case S5M8767_LDO3 ... S5M8767_LDO28:
  		*reg = S5M8767_REG_LDO3CTRL + (reg_id - S5M8767_LDO3);
  		break;
  	case S5M8767_BUCK1:
  		*reg = S5M8767_REG_BUCK1CTRL1;
  		break;
  	case S5M8767_BUCK2 ... S5M8767_BUCK4:
  		*reg = S5M8767_REG_BUCK2CTRL + (reg_id - S5M8767_BUCK2) * 9;
  		break;
  	case S5M8767_BUCK5:
  		*reg = S5M8767_REG_BUCK5CTRL1;
  		break;
  	case S5M8767_BUCK6 ... S5M8767_BUCK9:
  		*reg = S5M8767_REG_BUCK6CTRL1 + (reg_id - S5M8767_BUCK6) * 2;
  		break;
  	default:
  		return -EINVAL;
  	}
  
  	for (i = 0; i < s5m8767->num_regulators; i++) {
  		if (s5m8767->opmode[i].id == reg_id) {
  			mode = s5m8767->opmode[i].mode;
  			break;
  		}
  	}
  
  	if (i >= s5m8767->num_regulators)
  		return -EINVAL;
  
  	*enable_ctrl = s5m8767_opmode_reg[reg_id][mode] << S5M8767_ENCTRL_SHIFT;
  
  	return 0;
  }
  
  static int s5m8767_get_vsel_reg(int reg_id, struct s5m8767_info *s5m8767)
  {
  	int reg;
  
  	switch (reg_id) {
  	case S5M8767_LDO1 ... S5M8767_LDO2:
  		reg = S5M8767_REG_LDO1CTRL + (reg_id - S5M8767_LDO1);
  		break;
  	case S5M8767_LDO3 ... S5M8767_LDO28:
  		reg = S5M8767_REG_LDO3CTRL + (reg_id - S5M8767_LDO3);
  		break;
  	case S5M8767_BUCK1:
  		reg = S5M8767_REG_BUCK1CTRL2;
  		break;
  	case S5M8767_BUCK2:
  		reg = S5M8767_REG_BUCK2DVS1;
  		if (s5m8767->buck2_gpiodvs)
  			reg += s5m8767->buck_gpioindex;
  		break;
  	case S5M8767_BUCK3:
  		reg = S5M8767_REG_BUCK3DVS1;
  		if (s5m8767->buck3_gpiodvs)
  			reg += s5m8767->buck_gpioindex;
  		break;
  	case S5M8767_BUCK4:
  		reg = S5M8767_REG_BUCK4DVS1;
  		if (s5m8767->buck4_gpiodvs)
  			reg += s5m8767->buck_gpioindex;
  		break;
  	case S5M8767_BUCK5:
  		reg = S5M8767_REG_BUCK5CTRL2;
  		break;
  	case S5M8767_BUCK6 ... S5M8767_BUCK9:
  		reg = S5M8767_REG_BUCK6CTRL2 + (reg_id - S5M8767_BUCK6) * 2;
  		break;
  	default:
  		return -EINVAL;
  	}
  
  	return reg;
  }
  
  static int s5m8767_convert_voltage_to_sel(const struct sec_voltage_desc *desc,
  					  int min_vol)
  {
  	int selector = 0;
  
  	if (desc == NULL)
  		return -EINVAL;
  
  	if (min_vol > desc->max)
  		return -EINVAL;
  
  	if (min_vol < desc->min)
  		min_vol = desc->min;
  
  	selector = DIV_ROUND_UP(min_vol - desc->min, desc->step);
  
  	if (desc->min + desc->step * selector > desc->max)
  		return -EINVAL;
  
  	return selector;
  }
  
  static inline int s5m8767_set_high(struct s5m8767_info *s5m8767)
  {
  	int temp_index = s5m8767->buck_gpioindex;
  
  	gpio_set_value(s5m8767->buck_gpios[0], (temp_index >> 2) & 0x1);
  	gpio_set_value(s5m8767->buck_gpios[1], (temp_index >> 1) & 0x1);
  	gpio_set_value(s5m8767->buck_gpios[2], temp_index & 0x1);
  
  	return 0;
  }
  
  static inline int s5m8767_set_low(struct s5m8767_info *s5m8767)
  {
  	int temp_index = s5m8767->buck_gpioindex;
  
  	gpio_set_value(s5m8767->buck_gpios[2], temp_index & 0x1);
  	gpio_set_value(s5m8767->buck_gpios[1], (temp_index >> 1) & 0x1);
  	gpio_set_value(s5m8767->buck_gpios[0], (temp_index >> 2) & 0x1);
  
  	return 0;
  }
  
  static int s5m8767_set_voltage_sel(struct regulator_dev *rdev,
  				   unsigned selector)
  {
  	struct s5m8767_info *s5m8767 = rdev_get_drvdata(rdev);
  	int reg_id = rdev_get_id(rdev);
  	int old_index, index = 0;
  	u8 *buck234_vol = NULL;
  
  	switch (reg_id) {
  	case S5M8767_LDO1 ... S5M8767_LDO28:
  		break;
  	case S5M8767_BUCK1 ... S5M8767_BUCK6:
  		if (reg_id == S5M8767_BUCK2 && s5m8767->buck2_gpiodvs)
  			buck234_vol = &s5m8767->buck2_vol[0];
  		else if (reg_id == S5M8767_BUCK3 && s5m8767->buck3_gpiodvs)
  			buck234_vol = &s5m8767->buck3_vol[0];
  		else if (reg_id == S5M8767_BUCK4 && s5m8767->buck4_gpiodvs)
  			buck234_vol = &s5m8767->buck4_vol[0];
  		break;
  	case S5M8767_BUCK7 ... S5M8767_BUCK8:
  		return -EINVAL;
  	case S5M8767_BUCK9:
  		break;
  	default:
  		return -EINVAL;
  	}
  
  	/* buck234_vol != NULL means to control buck234 voltage via DVS GPIO */
  	if (buck234_vol) {
  		while (*buck234_vol != selector) {
  			buck234_vol++;
  			index++;
  		}
  		old_index = s5m8767->buck_gpioindex;
  		s5m8767->buck_gpioindex = index;
  
  		if (index > old_index)
  			return s5m8767_set_high(s5m8767);
  		else
  			return s5m8767_set_low(s5m8767);
  	} else {
  		return regulator_set_voltage_sel_regmap(rdev, selector);
  	}
  }
  
  static int s5m8767_set_voltage_time_sel(struct regulator_dev *rdev,
  					     unsigned int old_sel,
  					     unsigned int new_sel)
  {
  	struct s5m8767_info *s5m8767 = rdev_get_drvdata(rdev);
  
  	if ((old_sel < new_sel) && s5m8767->ramp_delay)
  		return DIV_ROUND_UP(rdev->desc->uV_step * (new_sel - old_sel),
  					s5m8767->ramp_delay * 1000);
  	return 0;
  }
  
  static const struct regulator_ops s5m8767_ops = {
  	.list_voltage		= regulator_list_voltage_linear,
  	.is_enabled		= regulator_is_enabled_regmap,
  	.enable			= regulator_enable_regmap,
  	.disable		= regulator_disable_regmap,
  	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
  	.set_voltage_sel	= s5m8767_set_voltage_sel,
  	.set_voltage_time_sel	= s5m8767_set_voltage_time_sel,
  };
  
  static const struct regulator_ops s5m8767_buck78_ops = {
  	.list_voltage		= regulator_list_voltage_linear,
  	.is_enabled		= regulator_is_enabled_regmap,
  	.enable			= regulator_enable_regmap,
  	.disable		= regulator_disable_regmap,
  	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
  	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
  };
  
  #define s5m8767_regulator_desc(_name) {		\
  	.name		= #_name,		\
  	.id		= S5M8767_##_name,	\
  	.ops		= &s5m8767_ops,		\
  	.type		= REGULATOR_VOLTAGE,	\
  	.owner		= THIS_MODULE,		\
  }
  
  #define s5m8767_regulator_buck78_desc(_name) {	\
  	.name		= #_name,		\
  	.id		= S5M8767_##_name,	\
  	.ops		= &s5m8767_buck78_ops,	\
  	.type		= REGULATOR_VOLTAGE,	\
  	.owner		= THIS_MODULE,		\
  }
  
  static struct regulator_desc regulators[] = {
  	s5m8767_regulator_desc(LDO1),
  	s5m8767_regulator_desc(LDO2),
  	s5m8767_regulator_desc(LDO3),
  	s5m8767_regulator_desc(LDO4),
  	s5m8767_regulator_desc(LDO5),
  	s5m8767_regulator_desc(LDO6),
  	s5m8767_regulator_desc(LDO7),
  	s5m8767_regulator_desc(LDO8),
  	s5m8767_regulator_desc(LDO9),
  	s5m8767_regulator_desc(LDO10),
  	s5m8767_regulator_desc(LDO11),
  	s5m8767_regulator_desc(LDO12),
  	s5m8767_regulator_desc(LDO13),
  	s5m8767_regulator_desc(LDO14),
  	s5m8767_regulator_desc(LDO15),
  	s5m8767_regulator_desc(LDO16),
  	s5m8767_regulator_desc(LDO17),
  	s5m8767_regulator_desc(LDO18),
  	s5m8767_regulator_desc(LDO19),
  	s5m8767_regulator_desc(LDO20),
  	s5m8767_regulator_desc(LDO21),
  	s5m8767_regulator_desc(LDO22),
  	s5m8767_regulator_desc(LDO23),
  	s5m8767_regulator_desc(LDO24),
  	s5m8767_regulator_desc(LDO25),
  	s5m8767_regulator_desc(LDO26),
  	s5m8767_regulator_desc(LDO27),
  	s5m8767_regulator_desc(LDO28),
  	s5m8767_regulator_desc(BUCK1),
  	s5m8767_regulator_desc(BUCK2),
  	s5m8767_regulator_desc(BUCK3),
  	s5m8767_regulator_desc(BUCK4),
  	s5m8767_regulator_desc(BUCK5),
  	s5m8767_regulator_desc(BUCK6),
  	s5m8767_regulator_buck78_desc(BUCK7),
  	s5m8767_regulator_buck78_desc(BUCK8),
  	s5m8767_regulator_desc(BUCK9),
  };
  
  /*
   * Enable GPIO control over BUCK9 in regulator_config for that regulator.
   */
  static void s5m8767_regulator_config_ext_control(struct s5m8767_info *s5m8767,
  		struct sec_regulator_data *rdata,
  		struct regulator_config *config)
  {
  	int i, mode = 0;
  
  	if (rdata->id != S5M8767_BUCK9)
  		return;
  
  	/* Check if opmode for regulator matches S5M8767_ENCTRL_USE_GPIO */
  	for (i = 0; i < s5m8767->num_regulators; i++) {
  		const struct sec_opmode_data *opmode = &s5m8767->opmode[i];
  		if (opmode->id == rdata->id) {
  			mode = s5m8767_opmode_reg[rdata->id][opmode->mode];
  			break;
  		}
  	}
  	if (mode != S5M8767_ENCTRL_USE_GPIO) {
  		dev_warn(s5m8767->dev,
  				"ext-control for %pOFn: mismatched op_mode (%x), ignoring\n",
  				rdata->reg_node, mode);
  		return;
  	}
  
  	if (!rdata->ext_control_gpiod) {
  		dev_warn(s5m8767->dev,
  				"ext-control for %pOFn: GPIO not valid, ignoring\n",
  			 rdata->reg_node);
  		return;
  	}
  
  	config->ena_gpiod = rdata->ext_control_gpiod;
  }
  
  /*
   * Turn on GPIO control over BUCK9.
   */
  static int s5m8767_enable_ext_control(struct s5m8767_info *s5m8767,
  		struct regulator_dev *rdev)
  {
  	int id = rdev_get_id(rdev);
  	int ret, reg, enable_ctrl;
  
  	if (id != S5M8767_BUCK9)
  		return -EINVAL;
  
  	ret = s5m8767_get_register(s5m8767, id, &reg, &enable_ctrl);
  	if (ret)
  		return ret;
  
  	return regmap_update_bits(s5m8767->iodev->regmap_pmic,
  			reg, S5M8767_ENCTRL_MASK,
  			S5M8767_ENCTRL_USE_GPIO << S5M8767_ENCTRL_SHIFT);
  }
  
  
  #ifdef CONFIG_OF
  static int s5m8767_pmic_dt_parse_dvs_gpio(struct sec_pmic_dev *iodev,
  			struct sec_platform_data *pdata,
  			struct device_node *pmic_np)
  {
  	int i, gpio;
  
  	for (i = 0; i < 3; i++) {
  		gpio = of_get_named_gpio(pmic_np,
  					"s5m8767,pmic-buck-dvs-gpios", i);
  		if (!gpio_is_valid(gpio)) {
  			dev_err(iodev->dev, "invalid gpio[%d]: %d\n", i, gpio);
  			return -EINVAL;
  		}
  		pdata->buck_gpios[i] = gpio;
  	}
  	return 0;
  }
  
  static int s5m8767_pmic_dt_parse_ds_gpio(struct sec_pmic_dev *iodev,
  			struct sec_platform_data *pdata,
  			struct device_node *pmic_np)
  {
  	int i, gpio;
  
  	for (i = 0; i < 3; i++) {
  		gpio = of_get_named_gpio(pmic_np,
  					"s5m8767,pmic-buck-ds-gpios", i);
  		if (!gpio_is_valid(gpio)) {
  			dev_err(iodev->dev, "invalid gpio[%d]: %d\n", i, gpio);
  			return -EINVAL;
  		}
  		pdata->buck_ds[i] = gpio;
  	}
  	return 0;
  }
  
  static int s5m8767_pmic_dt_parse_pdata(struct platform_device *pdev,
  					struct sec_platform_data *pdata)
  {
  	struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
  	struct device_node *pmic_np, *regulators_np, *reg_np;
  	struct sec_regulator_data *rdata;
  	struct sec_opmode_data *rmode;
  	unsigned int i, dvs_voltage_nr = 8, 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_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(&pdev->dev,
  			     pdata->num_regulators, sizeof(*rdata),
  			     GFP_KERNEL);
  	if (!rdata) {
  		of_node_put(regulators_np);
  		return -ENOMEM;
  	}
  
  	rmode = devm_kcalloc(&pdev->dev,
  			     pdata->num_regulators, sizeof(*rmode),
  			     GFP_KERNEL);
  	if (!rmode) {
  		of_node_put(regulators_np);
  		return -ENOMEM;
  	}
  
  	pdata->regulators = rdata;
  	pdata->opmode = rmode;
  	for_each_child_of_node(regulators_np, reg_np) {
  		for (i = 0; i < ARRAY_SIZE(regulators); i++)
  			if (of_node_name_eq(reg_np, regulators[i].name))
  				break;
  
  		if (i == ARRAY_SIZE(regulators)) {
  			dev_warn(iodev->dev,
  			"don't know how to configure regulator %pOFn\n",
  			reg_np);
  			continue;
  		}
  
  		rdata->ext_control_gpiod = devm_fwnode_gpiod_get(
  			&pdev->dev,
  			of_fwnode_handle(reg_np),
  			"s5m8767,pmic-ext-control",
  			GPIOD_OUT_HIGH | GPIOD_FLAGS_BIT_NONEXCLUSIVE,
  			"s5m8767");
  		if (PTR_ERR(rdata->ext_control_gpiod) == -ENOENT) {
  			rdata->ext_control_gpiod = NULL;
  		} else if (IS_ERR(rdata->ext_control_gpiod)) {
  			of_node_put(reg_np);
  			of_node_put(regulators_np);
  			return PTR_ERR(rdata->ext_control_gpiod);
  		}
  
  		rdata->id = i;
  		rdata->initdata = of_get_regulator_init_data(
  						&pdev->dev, reg_np,
  						&regulators[i]);
  		rdata->reg_node = reg_np;
  		rdata++;
  		rmode->id = i;
  		if (of_property_read_u32(reg_np, "op_mode",
  				&rmode->mode)) {
  			dev_warn(iodev->dev,
  				"no op_mode property at %pOF\n",
  				reg_np);
  
  			rmode->mode = S5M8767_OPMODE_NORMAL_MODE;
  		}
  		rmode++;
  	}
  
  	of_node_put(regulators_np);
  
  	if (of_get_property(pmic_np, "s5m8767,pmic-buck2-uses-gpio-dvs", NULL)) {
  		pdata->buck2_gpiodvs = true;
  
  		if (of_property_read_u32_array(pmic_np,
  				"s5m8767,pmic-buck2-dvs-voltage",
  				pdata->buck2_voltage, dvs_voltage_nr)) {
  			dev_err(iodev->dev, "buck2 voltages not specified\n");
  			return -EINVAL;
  		}
  	}
  
  	if (of_get_property(pmic_np, "s5m8767,pmic-buck3-uses-gpio-dvs", NULL)) {
  		pdata->buck3_gpiodvs = true;
  
  		if (of_property_read_u32_array(pmic_np,
  				"s5m8767,pmic-buck3-dvs-voltage",
  				pdata->buck3_voltage, dvs_voltage_nr)) {
  			dev_err(iodev->dev, "buck3 voltages not specified\n");
  			return -EINVAL;
  		}
  	}
  
  	if (of_get_property(pmic_np, "s5m8767,pmic-buck4-uses-gpio-dvs", NULL)) {
  		pdata->buck4_gpiodvs = true;
  
  		if (of_property_read_u32_array(pmic_np,
  				"s5m8767,pmic-buck4-dvs-voltage",
  				pdata->buck4_voltage, dvs_voltage_nr)) {
  			dev_err(iodev->dev, "buck4 voltages not specified\n");
  			return -EINVAL;
  		}
  	}
  
  	if (pdata->buck2_gpiodvs || pdata->buck3_gpiodvs ||
  						pdata->buck4_gpiodvs) {
  		ret = s5m8767_pmic_dt_parse_dvs_gpio(iodev, pdata, pmic_np);
  		if (ret)
  			return -EINVAL;
  
  		if (of_property_read_u32(pmic_np,
  				"s5m8767,pmic-buck-default-dvs-idx",
  				&pdata->buck_default_idx)) {
  			pdata->buck_default_idx = 0;
  		} else {
  			if (pdata->buck_default_idx >= 8) {
  				pdata->buck_default_idx = 0;
  				dev_info(iodev->dev,
  				"invalid value for default dvs index, use 0\n");
  			}
  		}
  	}
  
  	ret = s5m8767_pmic_dt_parse_ds_gpio(iodev, pdata, pmic_np);
  	if (ret)
  		return -EINVAL;
  
  	if (of_get_property(pmic_np, "s5m8767,pmic-buck2-ramp-enable", NULL))
  		pdata->buck2_ramp_enable = true;
  
  	if (of_get_property(pmic_np, "s5m8767,pmic-buck3-ramp-enable", NULL))
  		pdata->buck3_ramp_enable = true;
  
  	if (of_get_property(pmic_np, "s5m8767,pmic-buck4-ramp-enable", NULL))
  		pdata->buck4_ramp_enable = true;
  
  	if (pdata->buck2_ramp_enable || pdata->buck3_ramp_enable
  			|| pdata->buck4_ramp_enable) {
  		if (of_property_read_u32(pmic_np, "s5m8767,pmic-buck-ramp-delay",
  				&pdata->buck_ramp_delay))
  			pdata->buck_ramp_delay = 0;
  	}
  
  	return 0;
  }
  #else
  static int s5m8767_pmic_dt_parse_pdata(struct platform_device *pdev,
  					struct sec_platform_data *pdata)
  {
  	return 0;
  }
  #endif /* CONFIG_OF */
  
  static int s5m8767_pmic_probe(struct platform_device *pdev)
  {
  	struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
  	struct sec_platform_data *pdata = iodev->pdata;
  	struct regulator_config config = { };
  	struct s5m8767_info *s5m8767;
  	int i, ret, buck_init;
  
  	if (!pdata) {
  		dev_err(pdev->dev.parent, "Platform data not supplied\n");
  		return -ENODEV;
  	}
  
  	if (iodev->dev->of_node) {
  		ret = s5m8767_pmic_dt_parse_pdata(pdev, pdata);
  		if (ret)
  			return ret;
  	}
  
  	if (pdata->buck2_gpiodvs) {
  		if (pdata->buck3_gpiodvs || pdata->buck4_gpiodvs) {
  			dev_err(&pdev->dev, "S5M8767 GPIO DVS NOT VALID\n");
  			return -EINVAL;
  		}
  	}
  
  	if (pdata->buck3_gpiodvs) {
  		if (pdata->buck2_gpiodvs || pdata->buck4_gpiodvs) {
  			dev_err(&pdev->dev, "S5M8767 GPIO DVS NOT VALID\n");
  			return -EINVAL;
  		}
  	}
  
  	if (pdata->buck4_gpiodvs) {
  		if (pdata->buck2_gpiodvs || pdata->buck3_gpiodvs) {
  			dev_err(&pdev->dev, "S5M8767 GPIO DVS NOT VALID\n");
  			return -EINVAL;
  		}
  	}
  
  	s5m8767 = devm_kzalloc(&pdev->dev, sizeof(struct s5m8767_info),
  				GFP_KERNEL);
  	if (!s5m8767)
  		return -ENOMEM;
  
  	s5m8767->dev = &pdev->dev;
  	s5m8767->iodev = iodev;
  	s5m8767->num_regulators = pdata->num_regulators;
  	platform_set_drvdata(pdev, s5m8767);
  
  	s5m8767->buck_gpioindex = pdata->buck_default_idx;
  	s5m8767->buck2_gpiodvs = pdata->buck2_gpiodvs;
  	s5m8767->buck3_gpiodvs = pdata->buck3_gpiodvs;
  	s5m8767->buck4_gpiodvs = pdata->buck4_gpiodvs;
  	s5m8767->buck_gpios[0] = pdata->buck_gpios[0];
  	s5m8767->buck_gpios[1] = pdata->buck_gpios[1];
  	s5m8767->buck_gpios[2] = pdata->buck_gpios[2];
  	s5m8767->buck_ds[0] = pdata->buck_ds[0];
  	s5m8767->buck_ds[1] = pdata->buck_ds[1];
  	s5m8767->buck_ds[2] = pdata->buck_ds[2];
  
  	s5m8767->ramp_delay = pdata->buck_ramp_delay;
  	s5m8767->buck2_ramp = pdata->buck2_ramp_enable;
  	s5m8767->buck3_ramp = pdata->buck3_ramp_enable;
  	s5m8767->buck4_ramp = pdata->buck4_ramp_enable;
  	s5m8767->opmode = pdata->opmode;
  
  	buck_init = s5m8767_convert_voltage_to_sel(&buck_voltage_val2,
  						   pdata->buck2_init);
  
  	regmap_write(s5m8767->iodev->regmap_pmic, S5M8767_REG_BUCK2DVS2,
  			buck_init);
  
  	buck_init = s5m8767_convert_voltage_to_sel(&buck_voltage_val2,
  						   pdata->buck3_init);
  
  	regmap_write(s5m8767->iodev->regmap_pmic, S5M8767_REG_BUCK3DVS2,
  			buck_init);
  
  	buck_init = s5m8767_convert_voltage_to_sel(&buck_voltage_val2,
  						   pdata->buck4_init);
  
  	regmap_write(s5m8767->iodev->regmap_pmic, S5M8767_REG_BUCK4DVS2,
  			buck_init);
  
  	for (i = 0; i < 8; i++) {
  		if (s5m8767->buck2_gpiodvs) {
  			s5m8767->buck2_vol[i] =
  				s5m8767_convert_voltage_to_sel(
  						&buck_voltage_val2,
  						pdata->buck2_voltage[i]);
  		}
  
  		if (s5m8767->buck3_gpiodvs) {
  			s5m8767->buck3_vol[i] =
  				s5m8767_convert_voltage_to_sel(
  						&buck_voltage_val2,
  						pdata->buck3_voltage[i]);
  		}
  
  		if (s5m8767->buck4_gpiodvs) {
  			s5m8767->buck4_vol[i] =
  				s5m8767_convert_voltage_to_sel(
  						&buck_voltage_val2,
  						pdata->buck4_voltage[i]);
  		}
  	}
  
  	if (pdata->buck2_gpiodvs || pdata->buck3_gpiodvs ||
  						pdata->buck4_gpiodvs) {
  
  		if (!gpio_is_valid(pdata->buck_gpios[0]) ||
  			!gpio_is_valid(pdata->buck_gpios[1]) ||
  			!gpio_is_valid(pdata->buck_gpios[2])) {
  			dev_err(&pdev->dev, "GPIO NOT VALID\n");
  			return -EINVAL;
  		}
  
  		ret = devm_gpio_request(&pdev->dev, pdata->buck_gpios[0],
  					"S5M8767 SET1");
  		if (ret)
  			return ret;
  
  		ret = devm_gpio_request(&pdev->dev, pdata->buck_gpios[1],
  					"S5M8767 SET2");
  		if (ret)
  			return ret;
  
  		ret = devm_gpio_request(&pdev->dev, pdata->buck_gpios[2],
  					"S5M8767 SET3");
  		if (ret)
  			return ret;
  
  		/* SET1 GPIO */
  		gpio_direction_output(pdata->buck_gpios[0],
  				(s5m8767->buck_gpioindex >> 2) & 0x1);
  		/* SET2 GPIO */
  		gpio_direction_output(pdata->buck_gpios[1],
  				(s5m8767->buck_gpioindex >> 1) & 0x1);
  		/* SET3 GPIO */
  		gpio_direction_output(pdata->buck_gpios[2],
  				(s5m8767->buck_gpioindex >> 0) & 0x1);
  	}
  
  	ret = devm_gpio_request(&pdev->dev, pdata->buck_ds[0], "S5M8767 DS2");
  	if (ret)
  		return ret;
  
  	ret = devm_gpio_request(&pdev->dev, pdata->buck_ds[1], "S5M8767 DS3");
  	if (ret)
  		return ret;
  
  	ret = devm_gpio_request(&pdev->dev, pdata->buck_ds[2], "S5M8767 DS4");
  	if (ret)
  		return ret;
  
  	/* DS2 GPIO */
  	gpio_direction_output(pdata->buck_ds[0], 0x0);
  	/* DS3 GPIO */
  	gpio_direction_output(pdata->buck_ds[1], 0x0);
  	/* DS4 GPIO */
  	gpio_direction_output(pdata->buck_ds[2], 0x0);
  
  	regmap_update_bits(s5m8767->iodev->regmap_pmic,
  			   S5M8767_REG_BUCK2CTRL, 1 << 1,
  			   (pdata->buck2_gpiodvs) ? (1 << 1) : (0 << 1));
  	regmap_update_bits(s5m8767->iodev->regmap_pmic,
  			   S5M8767_REG_BUCK3CTRL, 1 << 1,
  			   (pdata->buck3_gpiodvs) ? (1 << 1) : (0 << 1));
  	regmap_update_bits(s5m8767->iodev->regmap_pmic,
  			   S5M8767_REG_BUCK4CTRL, 1 << 1,
  			   (pdata->buck4_gpiodvs) ? (1 << 1) : (0 << 1));
  
  	/* Initialize GPIO DVS registers */
  	for (i = 0; i < 8; i++) {
  		if (s5m8767->buck2_gpiodvs) {
  			regmap_write(s5m8767->iodev->regmap_pmic,
  					S5M8767_REG_BUCK2DVS1 + i,
  					s5m8767->buck2_vol[i]);
  		}
  
  		if (s5m8767->buck3_gpiodvs) {
  			regmap_write(s5m8767->iodev->regmap_pmic,
  					S5M8767_REG_BUCK3DVS1 + i,
  					s5m8767->buck3_vol[i]);
  		}
  
  		if (s5m8767->buck4_gpiodvs) {
  			regmap_write(s5m8767->iodev->regmap_pmic,
  					S5M8767_REG_BUCK4DVS1 + i,
  					s5m8767->buck4_vol[i]);
  		}
  	}
  
  	if (s5m8767->buck2_ramp)
  		regmap_update_bits(s5m8767->iodev->regmap_pmic,
  				S5M8767_REG_DVSRAMP, 0x08, 0x08);
  
  	if (s5m8767->buck3_ramp)
  		regmap_update_bits(s5m8767->iodev->regmap_pmic,
  				S5M8767_REG_DVSRAMP, 0x04, 0x04);
  
  	if (s5m8767->buck4_ramp)
  		regmap_update_bits(s5m8767->iodev->regmap_pmic,
  				S5M8767_REG_DVSRAMP, 0x02, 0x02);
  
  	if (s5m8767->buck2_ramp || s5m8767->buck3_ramp
  		|| s5m8767->buck4_ramp) {
  		unsigned int val;
  		switch (s5m8767->ramp_delay) {
  		case 5:
  			val = S5M8767_DVS_BUCK_RAMP_5;
  			break;
  		case 10:
  			val = S5M8767_DVS_BUCK_RAMP_10;
  			break;
  		case 25:
  			val = S5M8767_DVS_BUCK_RAMP_25;
  			break;
  		case 50:
  			val = S5M8767_DVS_BUCK_RAMP_50;
  			break;
  		case 100:
  			val = S5M8767_DVS_BUCK_RAMP_100;
  			break;
  		default:
  			val = S5M8767_DVS_BUCK_RAMP_10;
  		}
  		regmap_update_bits(s5m8767->iodev->regmap_pmic,
  					S5M8767_REG_DVSRAMP,
  					S5M8767_DVS_BUCK_RAMP_MASK,
  					val << S5M8767_DVS_BUCK_RAMP_SHIFT);
  	}
  
  	for (i = 0; i < pdata->num_regulators; i++) {
  		const struct sec_voltage_desc *desc;
  		int id = pdata->regulators[i].id;
  		int enable_reg, enable_val;
  		struct regulator_dev *rdev;
  
  		desc = reg_voltage_map[id];
  		if (desc) {
  			regulators[id].n_voltages =
  				(desc->max - desc->min) / desc->step + 1;
  			regulators[id].min_uV = desc->min;
  			regulators[id].uV_step = desc->step;
  			regulators[id].vsel_reg =
  				s5m8767_get_vsel_reg(id, s5m8767);
  			if (id < S5M8767_BUCK1)
  				regulators[id].vsel_mask = 0x3f;
  			else
  				regulators[id].vsel_mask = 0xff;
  
  			ret = s5m8767_get_register(s5m8767, id, &enable_reg,
  					     &enable_val);
  			if (ret) {
  				dev_err(s5m8767->dev, "error reading registers\n");
  				return ret;
  			}
  			regulators[id].enable_reg = enable_reg;
  			regulators[id].enable_mask = S5M8767_ENCTRL_MASK;
  			regulators[id].enable_val = enable_val;
  		}
  
  		config.dev = s5m8767->dev;
  		config.init_data = pdata->regulators[i].initdata;
  		config.driver_data = s5m8767;
  		config.regmap = iodev->regmap_pmic;
  		config.of_node = pdata->regulators[i].reg_node;
  		config.ena_gpiod = NULL;
  		if (pdata->regulators[i].ext_control_gpiod) {
  			/* Assigns config.ena_gpiod */
  			s5m8767_regulator_config_ext_control(s5m8767,
  					&pdata->regulators[i], &config);
  
  			/*
  			 * Hand the GPIO descriptor management over to the
  			 * regulator core, remove it from devres management.
  			 */
  			devm_gpiod_unhinge(s5m8767->dev, config.ena_gpiod);
  		}
  		rdev = devm_regulator_register(&pdev->dev, &regulators[id],
  						  &config);
  		if (IS_ERR(rdev)) {
  			ret = PTR_ERR(rdev);
  			dev_err(s5m8767->dev, "regulator init failed for %d\n",
  					id);
  			return ret;
  		}
  
  		if (pdata->regulators[i].ext_control_gpiod) {
  			ret = s5m8767_enable_ext_control(s5m8767, rdev);
  			if (ret < 0) {
  				dev_err(s5m8767->dev,
  						"failed to enable gpio control over %s: %d\n",
  						rdev->desc->name, ret);
  				return ret;
  			}
  		}
  	}
  
  	return 0;
  }
  
  static const struct platform_device_id s5m8767_pmic_id[] = {
  	{ "s5m8767-pmic", 0},
  	{ },
  };
  MODULE_DEVICE_TABLE(platform, s5m8767_pmic_id);
  
  static struct platform_driver s5m8767_pmic_driver = {
  	.driver = {
  		.name = "s5m8767-pmic",
  	},
  	.probe = s5m8767_pmic_probe,
  	.id_table = s5m8767_pmic_id,
  };
  module_platform_driver(s5m8767_pmic_driver);
  
  /* Module information */
  MODULE_AUTHOR("Sangbeom Kim <sbkim73@samsung.com>");
  MODULE_DESCRIPTION("Samsung S5M8767 Regulator Driver");
  MODULE_LICENSE("GPL");
  