text: // SPDX-License-Identifier: GPL-2.0-only
  /*
   * Regulator driver for Rockchip RK805/RK808/RK818
   *
   * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
   *
   * Author: Chris Zhong <zyw@rock-chips.com>
   * Author: Zhang Qing <zhangqing@rock-chips.com>
   *
   * Copyright (C) 2016 PHYTEC Messtechnik GmbH
   *
   * Author: Wadim Egorov <w.egorov@phytec.de>
   */
  
  #include <linux/delay.h>
  #include <linux/gpio.h>
  #include <linux/i2c.h>
  #include <linux/module.h>
  #include <linux/of_device.h>
  #include <linux/of_gpio.h>
  #include <linux/mfd/rk808.h>
  #include <linux/regulator/driver.h>
  #include <linux/regulator/of_regulator.h>
  #include <linux/gpio/consumer.h>
  
  /* Field Definitions */
  #define RK808_BUCK_VSEL_MASK	0x3f
  #define RK808_BUCK4_VSEL_MASK	0xf
  #define RK808_LDO_VSEL_MASK	0x1f
  
  #define RK818_BUCK_VSEL_MASK		0x3f
  #define RK818_BUCK4_VSEL_MASK		0x1f
  #define RK818_LDO_VSEL_MASK		0x1f
  #define RK818_LDO3_ON_VSEL_MASK		0xf
  #define RK818_BOOST_ON_VSEL_MASK	0xe0
  
  /* Ramp rate definitions for buck1 / buck2 only */
  #define RK808_RAMP_RATE_OFFSET		3
  #define RK808_RAMP_RATE_MASK		(3 << RK808_RAMP_RATE_OFFSET)
  #define RK808_RAMP_RATE_2MV_PER_US	(0 << RK808_RAMP_RATE_OFFSET)
  #define RK808_RAMP_RATE_4MV_PER_US	(1 << RK808_RAMP_RATE_OFFSET)
  #define RK808_RAMP_RATE_6MV_PER_US	(2 << RK808_RAMP_RATE_OFFSET)
  #define RK808_RAMP_RATE_10MV_PER_US	(3 << RK808_RAMP_RATE_OFFSET)
  
  #define RK808_DVS2_POL		BIT(2)
  #define RK808_DVS1_POL		BIT(1)
  
  /* Offset from XXX_ON_VSEL to XXX_SLP_VSEL */
  #define RK808_SLP_REG_OFFSET 1
  
  /* Offset from XXX_ON_VSEL to XXX_DVS_VSEL */
  #define RK808_DVS_REG_OFFSET 2
  
  /* Offset from XXX_EN_REG to SLEEP_SET_OFF_XXX */
  #define RK808_SLP_SET_OFF_REG_OFFSET 2
  
  /* max steps for increase voltage of Buck1/2, equal 100mv*/
  #define MAX_STEPS_ONE_TIME 8
  
  #define RK805_DESC(_id, _match, _supply, _min, _max, _step, _vreg,      \
  	_vmask, _ereg, _emask, _etime)                                  \
  	[_id] = {                                                       \
  		.name           = (_match),                             \
  		.supply_name    = (_supply),                            \
  		.of_match       = of_match_ptr(_match),                 \
  		.regulators_node = of_match_ptr("regulators"),          \
  		.type           = REGULATOR_VOLTAGE,                    \
  		.id             = (_id),                                \
  		.n_voltages     = (((_max) - (_min)) / (_step) + 1),    \
  		.owner          = THIS_MODULE,                          \
  		.min_uV         = (_min) * 1000,                        \
  		.uV_step        = (_step) * 1000,                       \
  		.vsel_reg       = (_vreg),                              \
  		.vsel_mask      = (_vmask),                             \
  		.enable_reg     = (_ereg),                              \
  		.enable_mask    = (_emask),                             \
  		.enable_time    = (_etime),                             \
  		.ops            = &rk805_reg_ops,                       \
  	}
  
  #define RK8XX_DESC(_id, _match, _supply, _min, _max, _step, _vreg,	\
  	_vmask, _ereg, _emask, _etime)					\
  	[_id] = {							\
  		.name		= (_match),				\
  		.supply_name	= (_supply),				\
  		.of_match	= of_match_ptr(_match),			\
  		.regulators_node = of_match_ptr("regulators"),		\
  		.type		= REGULATOR_VOLTAGE,			\
  		.id		= (_id),				\
  		.n_voltages	= (((_max) - (_min)) / (_step) + 1),	\
  		.owner		= THIS_MODULE,				\
  		.min_uV		= (_min) * 1000,			\
  		.uV_step	= (_step) * 1000,			\
  		.vsel_reg	= (_vreg),				\
  		.vsel_mask	= (_vmask),				\
  		.enable_reg	= (_ereg),				\
  		.enable_mask	= (_emask),				\
  		.enable_time	= (_etime),				\
  		.ops		= &rk808_reg_ops,			\
  	}
  
  #define RK8XX_DESC_SWITCH(_id, _match, _supply, _ereg, _emask)		\
  	[_id] = {							\
  		.name		= (_match),				\
  		.supply_name	= (_supply),				\
  		.of_match	= of_match_ptr(_match),			\
  		.regulators_node = of_match_ptr("regulators"),		\
  		.type		= REGULATOR_VOLTAGE,			\
  		.id		= (_id),				\
  		.enable_reg	= (_ereg),				\
  		.enable_mask	= (_emask),				\
  		.owner		= THIS_MODULE,				\
  		.ops		= &rk808_switch_ops			\
  	}
  
  
  struct rk808_regulator_data {
  	struct gpio_desc *dvs_gpio[2];
  };
  
  static const int rk808_buck_config_regs[] = {
  	RK808_BUCK1_CONFIG_REG,
  	RK808_BUCK2_CONFIG_REG,
  	RK808_BUCK3_CONFIG_REG,
  	RK808_BUCK4_CONFIG_REG,
  };
  
  static const struct regulator_linear_range rk808_ldo3_voltage_ranges[] = {
  	REGULATOR_LINEAR_RANGE(800000, 0, 13, 100000),
  	REGULATOR_LINEAR_RANGE(2500000, 15, 15, 0),
  };
  
  static int rk808_buck1_2_get_voltage_sel_regmap(struct regulator_dev *rdev)
  {
  	struct rk808_regulator_data *pdata = rdev_get_drvdata(rdev);
  	int id = rdev_get_id(rdev);
  	struct gpio_desc *gpio = pdata->dvs_gpio[id];
  	unsigned int val;
  	int ret;
  
  	if (!gpio || gpiod_get_value(gpio) == 0)
  		return regulator_get_voltage_sel_regmap(rdev);
  
  	ret = regmap_read(rdev->regmap,
  			  rdev->desc->vsel_reg + RK808_DVS_REG_OFFSET,
  			  &val);
  	if (ret != 0)
  		return ret;
  
  	val &= rdev->desc->vsel_mask;
  	val >>= ffs(rdev->desc->vsel_mask) - 1;
  
  	return val;
  }
  
  static int rk808_buck1_2_i2c_set_voltage_sel(struct regulator_dev *rdev,
  					     unsigned sel)
  {
  	int ret, delta_sel;
  	unsigned int old_sel, tmp, val, mask = rdev->desc->vsel_mask;
  
  	ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
  	if (ret != 0)
  		return ret;
  
  	tmp = val & ~mask;
  	old_sel = val & mask;
  	old_sel >>= ffs(mask) - 1;
  	delta_sel = sel - old_sel;
  
  	/*
  	 * If directly modify the register to change the voltage, we will face
  	 * the risk of overshoot. Put it into a multi-step, can effectively
  	 * avoid this problem, a step is 100mv here.
  	 */
  	while (delta_sel > MAX_STEPS_ONE_TIME) {
  		old_sel += MAX_STEPS_ONE_TIME;
  		val = old_sel << (ffs(mask) - 1);
  		val |= tmp;
  
  		/*
  		 * i2c is 400kHz (2.5us per bit) and we must transmit _at least_
  		 * 3 bytes (24 bits) plus start and stop so 26 bits.  So we've
  		 * got more than 65 us between each voltage change and thus
  		 * won't ramp faster than ~1500 uV / us.
  		 */
  		ret = regmap_write(rdev->regmap, rdev->desc->vsel_reg, val);
  		delta_sel = sel - old_sel;
  	}
  
  	sel <<= ffs(mask) - 1;
  	val = tmp | sel;
  	ret = regmap_write(rdev->regmap, rdev->desc->vsel_reg, val);
  
  	/*
  	 * When we change the voltage register directly, the ramp rate is about
  	 * 100000uv/us, wait 1us to make sure the target voltage to be stable,
  	 * so we needn't wait extra time after that.
  	 */
  	udelay(1);
  
  	return ret;
  }
  
  static int rk808_buck1_2_set_voltage_sel(struct regulator_dev *rdev,
  					 unsigned sel)
  {
  	struct rk808_regulator_data *pdata = rdev_get_drvdata(rdev);
  	int id = rdev_get_id(rdev);
  	struct gpio_desc *gpio = pdata->dvs_gpio[id];
  	unsigned int reg = rdev->desc->vsel_reg;
  	unsigned old_sel;
  	int ret, gpio_level;
  
  	if (!gpio)
  		return rk808_buck1_2_i2c_set_voltage_sel(rdev, sel);
  
  	gpio_level = gpiod_get_value(gpio);
  	if (gpio_level == 0) {
  		reg += RK808_DVS_REG_OFFSET;
  		ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &old_sel);
  	} else {
  		ret = regmap_read(rdev->regmap,
  				  reg + RK808_DVS_REG_OFFSET,
  				  &old_sel);
  	}
  
  	if (ret != 0)
  		return ret;
  
  	sel <<= ffs(rdev->desc->vsel_mask) - 1;
  	sel |= old_sel & ~rdev->desc->vsel_mask;
  
  	ret = regmap_write(rdev->regmap, reg, sel);
  	if (ret)
  		return ret;
  
  	gpiod_set_value(gpio, !gpio_level);
  
  	return ret;
  }
  
  static int rk808_buck1_2_set_voltage_time_sel(struct regulator_dev *rdev,
  				       unsigned int old_selector,
  				       unsigned int new_selector)
  {
  	struct rk808_regulator_data *pdata = rdev_get_drvdata(rdev);
  	int id = rdev_get_id(rdev);
  	struct gpio_desc *gpio = pdata->dvs_gpio[id];
  
  	/* if there is no dvs1/2 pin, we don't need wait extra time here. */
  	if (!gpio)
  		return 0;
  
  	return regulator_set_voltage_time_sel(rdev, old_selector, new_selector);
  }
  
  static int rk808_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
  {
  	unsigned int ramp_value = RK808_RAMP_RATE_10MV_PER_US;
  	unsigned int reg = rk808_buck_config_regs[rdev_get_id(rdev)];
  
  	switch (ramp_delay) {
  	case 1 ... 2000:
  		ramp_value = RK808_RAMP_RATE_2MV_PER_US;
  		break;
  	case 2001 ... 4000:
  		ramp_value = RK808_RAMP_RATE_4MV_PER_US;
  		break;
  	case 4001 ... 6000:
  		ramp_value = RK808_RAMP_RATE_6MV_PER_US;
  		break;
  	case 6001 ... 10000:
  		break;
  	default:
  		pr_warn("%s ramp_delay: %d not supported, setting 10000\n",
  			rdev->desc->name, ramp_delay);
  	}
  
  	return regmap_update_bits(rdev->regmap, reg,
  				  RK808_RAMP_RATE_MASK, ramp_value);
  }
  
  static int rk808_set_suspend_voltage(struct regulator_dev *rdev, int uv)
  {
  	unsigned int reg;
  	int sel = regulator_map_voltage_linear(rdev, uv, uv);
  
  	if (sel < 0)
  		return -EINVAL;
  
  	reg = rdev->desc->vsel_reg + RK808_SLP_REG_OFFSET;
  
  	return regmap_update_bits(rdev->regmap, reg,
  				  rdev->desc->vsel_mask,
  				  sel);
  }
  
  static int rk808_set_suspend_voltage_range(struct regulator_dev *rdev, int uv)
  {
  	unsigned int reg;
  	int sel = regulator_map_voltage_linear_range(rdev, uv, uv);
  
  	if (sel < 0)
  		return -EINVAL;
  
  	reg = rdev->desc->vsel_reg + RK808_SLP_REG_OFFSET;
  
  	return regmap_update_bits(rdev->regmap, reg,
  				  rdev->desc->vsel_mask,
  				  sel);
  }
  
  static int rk805_set_suspend_enable(struct regulator_dev *rdev)
  {
  	unsigned int reg;
  
  	reg = rdev->desc->enable_reg + RK808_SLP_SET_OFF_REG_OFFSET;
  
  	return regmap_update_bits(rdev->regmap, reg,
  				  rdev->desc->enable_mask,
  				  rdev->desc->enable_mask);
  }
  
  static int rk805_set_suspend_disable(struct regulator_dev *rdev)
  {
  	unsigned int reg;
  
  	reg = rdev->desc->enable_reg + RK808_SLP_SET_OFF_REG_OFFSET;
  
  	return regmap_update_bits(rdev->regmap, reg,
  				  rdev->desc->enable_mask,
  				  0);
  }
  
  static int rk808_set_suspend_enable(struct regulator_dev *rdev)
  {
  	unsigned int reg;
  
  	reg = rdev->desc->enable_reg + RK808_SLP_SET_OFF_REG_OFFSET;
  
  	return regmap_update_bits(rdev->regmap, reg,
  				  rdev->desc->enable_mask,
  				  0);
  }
  
  static int rk808_set_suspend_disable(struct regulator_dev *rdev)
  {
  	unsigned int reg;
  
  	reg = rdev->desc->enable_reg + RK808_SLP_SET_OFF_REG_OFFSET;
  
  	return regmap_update_bits(rdev->regmap, reg,
  				  rdev->desc->enable_mask,
  				  rdev->desc->enable_mask);
  }
  
  static const struct regulator_ops rk805_reg_ops = {
  	.list_voltage           = regulator_list_voltage_linear,
  	.map_voltage            = regulator_map_voltage_linear,
  	.get_voltage_sel        = regulator_get_voltage_sel_regmap,
  	.set_voltage_sel        = regulator_set_voltage_sel_regmap,
  	.enable                 = regulator_enable_regmap,
  	.disable                = regulator_disable_regmap,
  	.is_enabled             = regulator_is_enabled_regmap,
  	.set_suspend_voltage    = rk808_set_suspend_voltage,
  	.set_suspend_enable     = rk805_set_suspend_enable,
  	.set_suspend_disable    = rk805_set_suspend_disable,
  };
  
  static const struct regulator_ops rk805_switch_ops = {
  	.enable                 = regulator_enable_regmap,
  	.disable                = regulator_disable_regmap,
  	.is_enabled             = regulator_is_enabled_regmap,
  	.set_suspend_enable     = rk805_set_suspend_enable,
  	.set_suspend_disable    = rk805_set_suspend_disable,
  };
  
  static const struct regulator_ops rk808_buck1_2_ops = {
  	.list_voltage		= regulator_list_voltage_linear,
  	.map_voltage		= regulator_map_voltage_linear,
  	.get_voltage_sel	= rk808_buck1_2_get_voltage_sel_regmap,
  	.set_voltage_sel	= rk808_buck1_2_set_voltage_sel,
  	.set_voltage_time_sel	= rk808_buck1_2_set_voltage_time_sel,
  	.enable			= regulator_enable_regmap,
  	.disable		= regulator_disable_regmap,
  	.is_enabled		= regulator_is_enabled_regmap,
  	.set_ramp_delay		= rk808_set_ramp_delay,
  	.set_suspend_voltage	= rk808_set_suspend_voltage,
  	.set_suspend_enable	= rk808_set_suspend_enable,
  	.set_suspend_disable	= rk808_set_suspend_disable,
  };
  
  static const struct regulator_ops rk808_reg_ops = {
  	.list_voltage		= regulator_list_voltage_linear,
  	.map_voltage		= regulator_map_voltage_linear,
  	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
  	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
  	.enable			= regulator_enable_regmap,
  	.disable		= regulator_disable_regmap,
  	.is_enabled		= regulator_is_enabled_regmap,
  	.set_suspend_voltage	= rk808_set_suspend_voltage,
  	.set_suspend_enable	= rk808_set_suspend_enable,
  	.set_suspend_disable	= rk808_set_suspend_disable,
  };
  
  static const struct regulator_ops rk808_reg_ops_ranges = {
  	.list_voltage		= regulator_list_voltage_linear_range,
  	.map_voltage		= regulator_map_voltage_linear_range,
  	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
  	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
  	.enable			= regulator_enable_regmap,
  	.disable		= regulator_disable_regmap,
  	.is_enabled		= regulator_is_enabled_regmap,
  	.set_suspend_voltage	= rk808_set_suspend_voltage_range,
  	.set_suspend_enable	= rk808_set_suspend_enable,
  	.set_suspend_disable	= rk808_set_suspend_disable,
  };
  
  static const struct regulator_ops rk808_switch_ops = {
  	.enable			= regulator_enable_regmap,
  	.disable		= regulator_disable_regmap,
  	.is_enabled		= regulator_is_enabled_regmap,
  	.set_suspend_enable	= rk808_set_suspend_enable,
  	.set_suspend_disable	= rk808_set_suspend_disable,
  };
  
  static const struct regulator_linear_range rk805_buck_1_2_voltage_ranges[] = {
  	REGULATOR_LINEAR_RANGE(712500, 0, 59, 12500),
  	REGULATOR_LINEAR_RANGE(1800000, 60, 62, 200000),
  	REGULATOR_LINEAR_RANGE(2300000, 63, 63, 0),
  };
  
  static const struct regulator_desc rk805_reg[] = {
  	{
  		.name = "DCDC_REG1",
  		.supply_name = "vcc1",
  		.of_match = of_match_ptr("DCDC_REG1"),
  		.regulators_node = of_match_ptr("regulators"),
  		.id = RK805_ID_DCDC1,
  		.ops = &rk808_reg_ops_ranges,
  		.type = REGULATOR_VOLTAGE,
  		.n_voltages = 64,
  		.linear_ranges = rk805_buck_1_2_voltage_ranges,
  		.n_linear_ranges = ARRAY_SIZE(rk805_buck_1_2_voltage_ranges),
  		.vsel_reg = RK805_BUCK1_ON_VSEL_REG,
  		.vsel_mask = RK818_BUCK_VSEL_MASK,
  		.enable_reg = RK805_DCDC_EN_REG,
  		.enable_mask = BIT(0),
  		.owner = THIS_MODULE,
  	}, {
  		.name = "DCDC_REG2",
  		.supply_name = "vcc2",
  		.of_match = of_match_ptr("DCDC_REG2"),
  		.regulators_node = of_match_ptr("regulators"),
  		.id = RK805_ID_DCDC2,
  		.ops = &rk808_reg_ops_ranges,
  		.type = REGULATOR_VOLTAGE,
  		.n_voltages = 64,
  		.linear_ranges = rk805_buck_1_2_voltage_ranges,
  		.n_linear_ranges = ARRAY_SIZE(rk805_buck_1_2_voltage_ranges),
  		.vsel_reg = RK805_BUCK2_ON_VSEL_REG,
  		.vsel_mask = RK818_BUCK_VSEL_MASK,
  		.enable_reg = RK805_DCDC_EN_REG,
  		.enable_mask = BIT(1),
  		.owner = THIS_MODULE,
  	}, {
  		.name = "DCDC_REG3",
  		.supply_name = "vcc3",
  		.of_match = of_match_ptr("DCDC_REG3"),
  		.regulators_node = of_match_ptr("regulators"),
  		.id = RK805_ID_DCDC3,
  		.ops = &rk805_switch_ops,
  		.type = REGULATOR_VOLTAGE,
  		.n_voltages = 1,
  		.enable_reg = RK805_DCDC_EN_REG,
  		.enable_mask = BIT(2),
  		.owner = THIS_MODULE,
  	},
  
  	RK805_DESC(RK805_ID_DCDC4, "DCDC_REG4", "vcc4", 800, 3400, 100,
  		RK805_BUCK4_ON_VSEL_REG, RK818_BUCK4_VSEL_MASK,
  		RK805_DCDC_EN_REG, BIT(3), 0),
  
  	RK805_DESC(RK805_ID_LDO1, "LDO_REG1", "vcc5", 800, 3400, 100,
  		RK805_LDO1_ON_VSEL_REG, RK818_LDO_VSEL_MASK, RK805_LDO_EN_REG,
  		BIT(0), 400),
  	RK805_DESC(RK805_ID_LDO2, "LDO_REG2", "vcc5", 800, 3400, 100,
  		RK805_LDO2_ON_VSEL_REG, RK818_LDO_VSEL_MASK, RK805_LDO_EN_REG,
  		BIT(1), 400),
  	RK805_DESC(RK805_ID_LDO3, "LDO_REG3", "vcc6", 800, 3400, 100,
  		RK805_LDO3_ON_VSEL_REG, RK818_LDO_VSEL_MASK, RK805_LDO_EN_REG,
  		BIT(2), 400),
  };
  
  static const struct regulator_desc rk808_reg[] = {
  	{
  		.name = "DCDC_REG1",
  		.supply_name = "vcc1",
  		.of_match = of_match_ptr("DCDC_REG1"),
  		.regulators_node = of_match_ptr("regulators"),
  		.id = RK808_ID_DCDC1,
  		.ops = &rk808_buck1_2_ops,
  		.type = REGULATOR_VOLTAGE,
  		.min_uV = 712500,
  		.uV_step = 12500,
  		.n_voltages = 64,
  		.vsel_reg = RK808_BUCK1_ON_VSEL_REG,
  		.vsel_mask = RK808_BUCK_VSEL_MASK,
  		.enable_reg = RK808_DCDC_EN_REG,
  		.enable_mask = BIT(0),
  		.owner = THIS_MODULE,
  	}, {
  		.name = "DCDC_REG2",
  		.supply_name = "vcc2",
  		.of_match = of_match_ptr("DCDC_REG2"),
  		.regulators_node = of_match_ptr("regulators"),
  		.id = RK808_ID_DCDC2,
  		.ops = &rk808_buck1_2_ops,
  		.type = REGULATOR_VOLTAGE,
  		.min_uV = 712500,
  		.uV_step = 12500,
  		.n_voltages = 64,
  		.vsel_reg = RK808_BUCK2_ON_VSEL_REG,
  		.vsel_mask = RK808_BUCK_VSEL_MASK,
  		.enable_reg = RK808_DCDC_EN_REG,
  		.enable_mask = BIT(1),
  		.owner = THIS_MODULE,
  	}, {
  		.name = "DCDC_REG3",
  		.supply_name = "vcc3",
  		.of_match = of_match_ptr("DCDC_REG3"),
  		.regulators_node = of_match_ptr("regulators"),
  		.id = RK808_ID_DCDC3,
  		.ops = &rk808_switch_ops,
  		.type = REGULATOR_VOLTAGE,
  		.n_voltages = 1,
  		.enable_reg = RK808_DCDC_EN_REG,
  		.enable_mask = BIT(2),
  		.owner = THIS_MODULE,
  	},
  	RK8XX_DESC(RK808_ID_DCDC4, "DCDC_REG4", "vcc4", 1800, 3300, 100,
  		RK808_BUCK4_ON_VSEL_REG, RK808_BUCK4_VSEL_MASK,
  		RK808_DCDC_EN_REG, BIT(3), 0),
  	RK8XX_DESC(RK808_ID_LDO1, "LDO_REG1", "vcc6", 1800, 3400, 100,
  		RK808_LDO1_ON_VSEL_REG, RK808_LDO_VSEL_MASK, RK808_LDO_EN_REG,
  		BIT(0), 400),
  	RK8XX_DESC(RK808_ID_LDO2, "LDO_REG2", "vcc6", 1800, 3400, 100,
  		RK808_LDO2_ON_VSEL_REG, RK808_LDO_VSEL_MASK, RK808_LDO_EN_REG,
  		BIT(1), 400),
  	{
  		.name = "LDO_REG3",
  		.supply_name = "vcc7",
  		.of_match = of_match_ptr("LDO_REG3"),
  		.regulators_node = of_match_ptr("regulators"),
  		.id = RK808_ID_LDO3,
  		.ops = &rk808_reg_ops_ranges,
  		.type = REGULATOR_VOLTAGE,
  		.n_voltages = 16,
  		.linear_ranges = rk808_ldo3_voltage_ranges,
  		.n_linear_ranges = ARRAY_SIZE(rk808_ldo3_voltage_ranges),
  		.vsel_reg = RK808_LDO3_ON_VSEL_REG,
  		.vsel_mask = RK808_BUCK4_VSEL_MASK,
  		.enable_reg = RK808_LDO_EN_REG,
  		.enable_mask = BIT(2),
  		.enable_time = 400,
  		.owner = THIS_MODULE,
  	},
  	RK8XX_DESC(RK808_ID_LDO4, "LDO_REG4", "vcc9", 1800, 3400, 100,
  		RK808_LDO4_ON_VSEL_REG, RK808_LDO_VSEL_MASK, RK808_LDO_EN_REG,
  		BIT(3), 400),
  	RK8XX_DESC(RK808_ID_LDO5, "LDO_REG5", "vcc9", 1800, 3400, 100,
  		RK808_LDO5_ON_VSEL_REG, RK808_LDO_VSEL_MASK, RK808_LDO_EN_REG,
  		BIT(4), 400),
  	RK8XX_DESC(RK808_ID_LDO6, "LDO_REG6", "vcc10", 800, 2500, 100,
  		RK808_LDO6_ON_VSEL_REG, RK808_LDO_VSEL_MASK, RK808_LDO_EN_REG,
  		BIT(5), 400),
  	RK8XX_DESC(RK808_ID_LDO7, "LDO_REG7", "vcc7", 800, 2500, 100,
  		RK808_LDO7_ON_VSEL_REG, RK808_LDO_VSEL_MASK, RK808_LDO_EN_REG,
  		BIT(6), 400),
  	RK8XX_DESC(RK808_ID_LDO8, "LDO_REG8", "vcc11", 1800, 3400, 100,
  		RK808_LDO8_ON_VSEL_REG, RK808_LDO_VSEL_MASK, RK808_LDO_EN_REG,
  		BIT(7), 400),
  	RK8XX_DESC_SWITCH(RK808_ID_SWITCH1, "SWITCH_REG1", "vcc8",
  		RK808_DCDC_EN_REG, BIT(5)),
  	RK8XX_DESC_SWITCH(RK808_ID_SWITCH2, "SWITCH_REG2", "vcc12",
  		RK808_DCDC_EN_REG, BIT(6)),
  };
  
  static const struct regulator_desc rk818_reg[] = {
  	{
  		.name = "DCDC_REG1",
  		.supply_name = "vcc1",
  		.of_match = of_match_ptr("DCDC_REG1"),
  		.regulators_node = of_match_ptr("regulators"),
  		.id = RK818_ID_DCDC1,
  		.ops = &rk808_reg_ops,
  		.type = REGULATOR_VOLTAGE,
  		.min_uV = 712500,
  		.uV_step = 12500,
  		.n_voltages = 64,
  		.vsel_reg = RK818_BUCK1_ON_VSEL_REG,
  		.vsel_mask = RK818_BUCK_VSEL_MASK,
  		.enable_reg = RK818_DCDC_EN_REG,
  		.enable_mask = BIT(0),
  		.owner = THIS_MODULE,
  	}, {
  		.name = "DCDC_REG2",
  		.supply_name = "vcc2",
  		.of_match = of_match_ptr("DCDC_REG2"),
  		.regulators_node = of_match_ptr("regulators"),
  		.id = RK818_ID_DCDC2,
  		.ops = &rk808_reg_ops,
  		.type = REGULATOR_VOLTAGE,
  		.min_uV = 712500,
  		.uV_step = 12500,
  		.n_voltages = 64,
  		.vsel_reg = RK818_BUCK2_ON_VSEL_REG,
  		.vsel_mask = RK818_BUCK_VSEL_MASK,
  		.enable_reg = RK818_DCDC_EN_REG,
  		.enable_mask = BIT(1),
  		.owner = THIS_MODULE,
  	}, {
  		.name = "DCDC_REG3",
  		.supply_name = "vcc3",
  		.of_match = of_match_ptr("DCDC_REG3"),
  		.regulators_node = of_match_ptr("regulators"),
  		.id = RK818_ID_DCDC3,
  		.ops = &rk808_switch_ops,
  		.type = REGULATOR_VOLTAGE,
  		.n_voltages = 1,
  		.enable_reg = RK818_DCDC_EN_REG,
  		.enable_mask = BIT(2),
  		.owner = THIS_MODULE,
  	},
  	RK8XX_DESC(RK818_ID_DCDC4, "DCDC_REG4", "vcc4", 1800, 3600, 100,
  		RK818_BUCK4_ON_VSEL_REG, RK818_BUCK4_VSEL_MASK,
  		RK818_DCDC_EN_REG, BIT(3), 0),
  	RK8XX_DESC(RK818_ID_BOOST, "DCDC_BOOST", "boost", 4700, 5400, 100,
  		RK818_BOOST_LDO9_ON_VSEL_REG, RK818_BOOST_ON_VSEL_MASK,
  		RK818_DCDC_EN_REG, BIT(4), 0),
  	RK8XX_DESC(RK818_ID_LDO1, "LDO_REG1", "vcc6", 1800, 3400, 100,
  		RK818_LDO1_ON_VSEL_REG, RK818_LDO_VSEL_MASK, RK818_LDO_EN_REG,
  		BIT(0), 400),
  	RK8XX_DESC(RK818_ID_LDO2, "LDO_REG2", "vcc6", 1800, 3400, 100,
  		RK818_LDO2_ON_VSEL_REG, RK818_LDO_VSEL_MASK, RK818_LDO_EN_REG,
  		BIT(1), 400),
  	{
  		.name = "LDO_REG3",
  		.supply_name = "vcc7",
  		.of_match = of_match_ptr("LDO_REG3"),
  		.regulators_node = of_match_ptr("regulators"),
  		.id = RK818_ID_LDO3,
  		.ops = &rk808_reg_ops_ranges,
  		.type = REGULATOR_VOLTAGE,
  		.n_voltages = 16,
  		.linear_ranges = rk808_ldo3_voltage_ranges,
  		.n_linear_ranges = ARRAY_SIZE(rk808_ldo3_voltage_ranges),
  		.vsel_reg = RK818_LDO3_ON_VSEL_REG,
  		.vsel_mask = RK818_LDO3_ON_VSEL_MASK,
  		.enable_reg = RK818_LDO_EN_REG,
  		.enable_mask = BIT(2),
  		.enable_time = 400,
  		.owner = THIS_MODULE,
  	},
  	RK8XX_DESC(RK818_ID_LDO4, "LDO_REG4", "vcc8", 1800, 3400, 100,
  		RK818_LDO4_ON_VSEL_REG, RK818_LDO_VSEL_MASK, RK818_LDO_EN_REG,
  		BIT(3), 400),
  	RK8XX_DESC(RK818_ID_LDO5, "LDO_REG5", "vcc7", 1800, 3400, 100,
  		RK818_LDO5_ON_VSEL_REG, RK818_LDO_VSEL_MASK, RK818_LDO_EN_REG,
  		BIT(4), 400),
  	RK8XX_DESC(RK818_ID_LDO6, "LDO_REG6", "vcc8", 800, 2500, 100,
  		RK818_LDO6_ON_VSEL_REG, RK818_LDO_VSEL_MASK, RK818_LDO_EN_REG,
  		BIT(5), 400),
  	RK8XX_DESC(RK818_ID_LDO7, "LDO_REG7", "vcc7", 800, 2500, 100,
  		RK818_LDO7_ON_VSEL_REG, RK818_LDO_VSEL_MASK, RK818_LDO_EN_REG,
  		BIT(6), 400),
  	RK8XX_DESC(RK818_ID_LDO8, "LDO_REG8", "vcc8", 1800, 3400, 100,
  		RK818_LDO8_ON_VSEL_REG, RK818_LDO_VSEL_MASK, RK818_LDO_EN_REG,
  		BIT(7), 400),
  	RK8XX_DESC(RK818_ID_LDO9, "LDO_REG9", "vcc9", 1800, 3400, 100,
  		RK818_BOOST_LDO9_ON_VSEL_REG, RK818_LDO_VSEL_MASK,
  		RK818_DCDC_EN_REG, BIT(5), 400),
  	RK8XX_DESC_SWITCH(RK818_ID_SWITCH, "SWITCH_REG", "vcc9",
  		RK818_DCDC_EN_REG, BIT(6)),
  	RK8XX_DESC_SWITCH(RK818_ID_HDMI_SWITCH, "HDMI_SWITCH", "h_5v",
  		RK818_H5V_EN_REG, BIT(0)),
  	RK8XX_DESC_SWITCH(RK818_ID_OTG_SWITCH, "OTG_SWITCH", "usb",
  		RK818_DCDC_EN_REG, BIT(7)),
  };
  
  static int rk808_regulator_dt_parse_pdata(struct device *dev,
  				   struct device *client_dev,
  				   struct regmap *map,
  				   struct rk808_regulator_data *pdata)
  {
  	struct device_node *np;
  	int tmp, ret = 0, i;
  
  	np = of_get_child_by_name(client_dev->of_node, "regulators");
  	if (!np)
  		return -ENXIO;
  
  	for (i = 0; i < ARRAY_SIZE(pdata->dvs_gpio); i++) {
  		pdata->dvs_gpio[i] =
  			devm_gpiod_get_index_optional(client_dev, "dvs", i,
  						      GPIOD_OUT_LOW);
  		if (IS_ERR(pdata->dvs_gpio[i])) {
  			ret = PTR_ERR(pdata->dvs_gpio[i]);
  			dev_err(dev, "failed to get dvs%d gpio (%d)\n", i, ret);
  			goto dt_parse_end;
  		}
  
  		if (!pdata->dvs_gpio[i]) {
  			dev_warn(dev, "there is no dvs%d gpio\n", i);
  			continue;
  		}
  
  		tmp = i ? RK808_DVS2_POL : RK808_DVS1_POL;
  		ret = regmap_update_bits(map, RK808_IO_POL_REG, tmp,
  				gpiod_is_active_low(pdata->dvs_gpio[i]) ?
  				0 : tmp);
  	}
  
  dt_parse_end:
  	of_node_put(np);
  	return ret;
  }
  
  static int rk808_regulator_probe(struct platform_device *pdev)
  {
  	struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
  	struct i2c_client *client = rk808->i2c;
  	struct regulator_config config = {};
  	struct regulator_dev *rk808_rdev;
  	struct rk808_regulator_data *pdata;
  	const struct regulator_desc *regulators;
  	int ret, i, nregulators;
  
  	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
  	if (!pdata)
  		return -ENOMEM;
  
  	ret = rk808_regulator_dt_parse_pdata(&pdev->dev, &client->dev,
  					     rk808->regmap, pdata);
  	if (ret < 0)
  		return ret;
  
  	platform_set_drvdata(pdev, pdata);
  
  	switch (rk808->variant) {
  	case RK805_ID:
  		regulators = rk805_reg;
  		nregulators = RK805_NUM_REGULATORS;
  		break;
  	case RK808_ID:
  		regulators = rk808_reg;
  		nregulators = RK808_NUM_REGULATORS;
  		break;
  	case RK818_ID:
  		regulators = rk818_reg;
  		nregulators = RK818_NUM_REGULATORS;
  		break;
  	default:
  		dev_err(&client->dev, "unsupported RK8XX ID %lu\n",
  			rk808->variant);
  		return -EINVAL;
  	}
  
  	config.dev = &client->dev;
  	config.driver_data = pdata;
  	config.regmap = rk808->regmap;
  
  	/* Instantiate the regulators */
  	for (i = 0; i < nregulators; i++) {
  		rk808_rdev = devm_regulator_register(&pdev->dev,
  						     &regulators[i], &config);
  		if (IS_ERR(rk808_rdev)) {
  			dev_err(&client->dev,
  				"failed to register %d regulator\n", i);
  			return PTR_ERR(rk808_rdev);
  		}
  	}
  
  	return 0;
  }
  
  static struct platform_driver rk808_regulator_driver = {
  	.probe = rk808_regulator_probe,
  	.driver = {
  		.name = "rk808-regulator"
  	},
  };
  
  module_platform_driver(rk808_regulator_driver);
  
  MODULE_DESCRIPTION("regulator driver for the RK805/RK808/RK818 series PMICs");
  MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
  MODULE_AUTHOR("Zhang Qing <zhangqing@rock-chips.com>");
  MODULE_AUTHOR("Wadim Egorov <w.egorov@phytec.de>");
  MODULE_LICENSE("GPL");
  MODULE_ALIAS("platform:rk808-regulator");
  