// SPDX-License-Identifier: GPL-2.0+
  //
  // Regulator driver for DA9063 PMIC series
  //
  // Copyright 2012 Dialog Semiconductors Ltd.
  // Copyright 2013 Philipp Zabel, Pengutronix
  //
  // Author: Krystian Garbaciak <krystian.garbaciak@diasemi.com>

  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/init.h>
  #include <linux/err.h>
  #include <linux/slab.h>
  #include <linux/of.h>
  #include <linux/platform_device.h>
  #include <linux/regmap.h>
  #include <linux/regulator/driver.h>
  #include <linux/regulator/machine.h>
  #include <linux/regulator/of_regulator.h>
  #include <linux/mfd/da9063/core.h>

  #include <linux/mfd/da9063/registers.h>
  
  
  /* Definition for registering regmap bit fields using a mask */
  #define BFIELD(_reg, _mask) \
  	REG_FIELD(_reg, __builtin_ffs((int)_mask) - 1, \
  		sizeof(unsigned int) * 8 - __builtin_clz((_mask)) - 1)

  /* DA9063 and DA9063L regulator IDs */
  enum {
  	/* BUCKs */
  	DA9063_ID_BCORE1,
  	DA9063_ID_BCORE2,
  	DA9063_ID_BPRO,
  	DA9063_ID_BMEM,
  	DA9063_ID_BIO,
  	DA9063_ID_BPERI,
  
  	/* BCORE1 and BCORE2 in merged mode */
  	DA9063_ID_BCORES_MERGED,
  	/* BMEM and BIO in merged mode */
  	DA9063_ID_BMEM_BIO_MERGED,
  	/* When two BUCKs are merged, they cannot be reused separately */
  
  	/* LDOs on both DA9063 and DA9063L */
  	DA9063_ID_LDO3,
  	DA9063_ID_LDO7,
  	DA9063_ID_LDO8,
  	DA9063_ID_LDO9,
  	DA9063_ID_LDO11,
  
  	/* DA9063-only LDOs */
  	DA9063_ID_LDO1,
  	DA9063_ID_LDO2,
  	DA9063_ID_LDO4,
  	DA9063_ID_LDO5,
  	DA9063_ID_LDO6,
  	DA9063_ID_LDO10,
  };
  
  /* Old regulator platform data */
  struct da9063_regulator_data {
  	int				id;
  	struct regulator_init_data	*initdata;
  };
  
  struct da9063_regulators_pdata {
  	unsigned			n_regulators;
  	struct da9063_regulator_data	*regulator_data;
  };

  /* Regulator capabilities and registers description */
  struct da9063_regulator_info {
  	struct regulator_desc desc;

  	/* DA9063 main register fields */
  	struct reg_field mode;		/* buck mode of operation */
  	struct reg_field suspend;
  	struct reg_field sleep;
  	struct reg_field suspend_sleep;
  	unsigned int suspend_vsel_reg;

  
  	/* DA9063 event detection bit */
  	struct reg_field oc_event;
  };
  
  /* Macros for LDO */
  #define DA9063_LDO(chip, regl_name, min_mV, step_mV, max_mV) \
  	.desc.id = chip##_ID_##regl_name, \
  	.desc.name = __stringify(chip##_##regl_name), \
  	.desc.ops = &da9063_ldo_ops, \
  	.desc.min_uV = (min_mV) * 1000, \
  	.desc.uV_step = (step_mV) * 1000, \

  	.desc.n_voltages = (((max_mV) - (min_mV))/(step_mV) + 1 \
  		+ (DA9063_V##regl_name##_BIAS)), \

  	.desc.enable_reg = DA9063_REG_##regl_name##_CONT, \
  	.desc.enable_mask = DA9063_LDO_EN, \
  	.desc.vsel_reg = DA9063_REG_V##regl_name##_A, \
  	.desc.vsel_mask = DA9063_V##regl_name##_MASK, \
  	.desc.linear_min_sel = DA9063_V##regl_name##_BIAS, \
  	.sleep = BFIELD(DA9063_REG_V##regl_name##_A, DA9063_LDO_SL), \
  	.suspend_sleep = BFIELD(DA9063_REG_V##regl_name##_B, DA9063_LDO_SL), \
  	.suspend_vsel_reg = DA9063_REG_V##regl_name##_B
  
  /* Macros for voltage DC/DC converters (BUCKs) */

  #define DA9063_BUCK(chip, regl_name, min_mV, step_mV, max_mV, limits_array, \
  		    creg, cmask) \

  	.desc.id = chip##_ID_##regl_name, \
  	.desc.name = __stringify(chip##_##regl_name), \
  	.desc.ops = &da9063_buck_ops, \
  	.desc.min_uV = (min_mV) * 1000, \
  	.desc.uV_step = (step_mV) * 1000, \
  	.desc.n_voltages = ((max_mV) - (min_mV))/(step_mV) + 1, \

  	.desc.csel_reg = (creg), \
  	.desc.csel_mask = (cmask), \
  	.desc.curr_table = limits_array, \
  	.desc.n_current_limits = ARRAY_SIZE(limits_array)

  
  #define DA9063_BUCK_COMMON_FIELDS(regl_name) \
  	.desc.enable_reg = DA9063_REG_##regl_name##_CONT, \
  	.desc.enable_mask = DA9063_BUCK_EN, \
  	.desc.vsel_reg = DA9063_REG_V##regl_name##_A, \
  	.desc.vsel_mask = DA9063_VBUCK_MASK, \
  	.desc.linear_min_sel = DA9063_VBUCK_BIAS, \
  	.sleep = BFIELD(DA9063_REG_V##regl_name##_A, DA9063_BUCK_SL), \
  	.suspend_sleep = BFIELD(DA9063_REG_V##regl_name##_B, DA9063_BUCK_SL), \
  	.suspend_vsel_reg = DA9063_REG_V##regl_name##_B, \
  	.mode = BFIELD(DA9063_REG_##regl_name##_CFG, DA9063_BUCK_MODE_MASK)
  
  /* Defines asignment of regulators info table to chip model */
  struct da9063_dev_model {
  	const struct da9063_regulator_info	*regulator_info;
  	unsigned				n_regulators;

  	enum da9063_type			type;

  };
  
  /* Single regulator settings */
  struct da9063_regulator {
  	struct regulator_desc			desc;
  	struct regulator_dev			*rdev;
  	struct da9063				*hw;
  	const struct da9063_regulator_info	*info;
  
  	struct regmap_field			*mode;
  	struct regmap_field			*suspend;
  	struct regmap_field			*sleep;
  	struct regmap_field			*suspend_sleep;

  };
  
  /* Encapsulates all information for the regulators driver */
  struct da9063_regulators {

  	unsigned				n_regulators;
  	/* Array size to be defined during init. Keep at end. */
  	struct da9063_regulator			regulator[0];
  };
  
  /* BUCK modes for DA9063 */
  enum {
  	BUCK_MODE_MANUAL,	/* 0 */
  	BUCK_MODE_SLEEP,	/* 1 */
  	BUCK_MODE_SYNC,		/* 2 */
  	BUCK_MODE_AUTO		/* 3 */
  };
  
  /* Regulator operations */
  
  /* Current limits array (in uA) for BCORE1, BCORE2, BPRO.
     Entry indexes corresponds to register values. */

  static const unsigned int da9063_buck_a_limits[] = {

  	 500000,  600000,  700000,  800000,  900000, 1000000, 1100000, 1200000,
  	1300000, 1400000, 1500000, 1600000, 1700000, 1800000, 1900000, 2000000
  };
  
  /* Current limits array (in uA) for BMEM, BIO, BPERI.
     Entry indexes corresponds to register values. */

  static const unsigned int da9063_buck_b_limits[] = {

  	1500000, 1600000, 1700000, 1800000, 1900000, 2000000, 2100000, 2200000,
  	2300000, 2400000, 2500000, 2600000, 2700000, 2800000, 2900000, 3000000
  };
  
  /* Current limits array (in uA) for merged BCORE1 and BCORE2.
     Entry indexes corresponds to register values. */

  static const unsigned int da9063_bcores_merged_limits[] = {

  	1000000, 1200000, 1400000, 1600000, 1800000, 2000000, 2200000, 2400000,
  	2600000, 2800000, 3000000, 3200000, 3400000, 3600000, 3800000, 4000000
  };
  
  /* Current limits array (in uA) for merged BMEM and BIO.
     Entry indexes corresponds to register values. */

  static const unsigned int da9063_bmem_bio_merged_limits[] = {

  	3000000, 3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000,
  	4600000, 4800000, 5000000, 5200000, 5400000, 5600000, 5800000, 6000000
  };

  static int da9063_buck_set_mode(struct regulator_dev *rdev, unsigned mode)
  {
  	struct da9063_regulator *regl = rdev_get_drvdata(rdev);
  	unsigned val;
  
  	switch (mode) {
  	case REGULATOR_MODE_FAST:
  		val = BUCK_MODE_SYNC;
  		break;
  	case REGULATOR_MODE_NORMAL:
  		val = BUCK_MODE_AUTO;
  		break;
  	case REGULATOR_MODE_STANDBY:
  		val = BUCK_MODE_SLEEP;
  		break;
  	default:
  		return -EINVAL;
  	}
  
  	return regmap_field_write(regl->mode, val);
  }
  
  /*
   * Bucks use single mode register field for normal operation
   * and suspend state.
   * There are 3 modes to map to: FAST, NORMAL, and STANDBY.
   */
  
  static unsigned da9063_buck_get_mode(struct regulator_dev *rdev)
  {
  	struct da9063_regulator *regl = rdev_get_drvdata(rdev);
  	struct regmap_field *field;
  	unsigned int val, mode = 0;
  	int ret;
  
  	ret = regmap_field_read(regl->mode, &val);
  	if (ret < 0)
  		return ret;
  
  	switch (val) {
  	default:
  	case BUCK_MODE_MANUAL:
  		mode = REGULATOR_MODE_FAST | REGULATOR_MODE_STANDBY;
  		/* Sleep flag bit decides the mode */
  		break;
  	case BUCK_MODE_SLEEP:
  		return REGULATOR_MODE_STANDBY;
  	case BUCK_MODE_SYNC:
  		return REGULATOR_MODE_FAST;
  	case BUCK_MODE_AUTO:
  		return REGULATOR_MODE_NORMAL;
  	}
  
  	/* Detect current regulator state */
  	ret = regmap_field_read(regl->suspend, &val);
  	if (ret < 0)
  		return 0;
  
  	/* Read regulator mode from proper register, depending on state */
  	if (val)
  		field = regl->suspend_sleep;
  	else
  		field = regl->sleep;
  
  	ret = regmap_field_read(field, &val);
  	if (ret < 0)
  		return 0;
  
  	if (val)
  		mode &= REGULATOR_MODE_STANDBY;
  	else
  		mode &= REGULATOR_MODE_NORMAL | REGULATOR_MODE_FAST;
  
  	return mode;
  }
  
  /*
   * LDOs use sleep flags - one for normal and one for suspend state.
   * There are 2 modes to map to: NORMAL and STANDBY (sleep) for each state.
   */
  
  static int da9063_ldo_set_mode(struct regulator_dev *rdev, unsigned mode)
  {
  	struct da9063_regulator *regl = rdev_get_drvdata(rdev);
  	unsigned val;
  
  	switch (mode) {
  	case REGULATOR_MODE_NORMAL:
  		val = 0;
  		break;
  	case REGULATOR_MODE_STANDBY:
  		val = 1;
  		break;
  	default:
  		return -EINVAL;
  	}
  
  	return regmap_field_write(regl->sleep, val);
  }
  
  static unsigned da9063_ldo_get_mode(struct regulator_dev *rdev)
  {
  	struct da9063_regulator *regl = rdev_get_drvdata(rdev);
  	struct regmap_field *field;
  	int ret, val;
  
  	/* Detect current regulator state */
  	ret = regmap_field_read(regl->suspend, &val);
  	if (ret < 0)
  		return 0;
  
  	/* Read regulator mode from proper register, depending on state */
  	if (val)
  		field = regl->suspend_sleep;
  	else
  		field = regl->sleep;
  
  	ret = regmap_field_read(field, &val);
  	if (ret < 0)
  		return 0;
  
  	if (val)
  		return REGULATOR_MODE_STANDBY;
  	else
  		return REGULATOR_MODE_NORMAL;
  }
  
  static int da9063_buck_get_status(struct regulator_dev *rdev)
  {
  	int ret = regulator_is_enabled_regmap(rdev);
  
  	if (ret == 0) {
  		ret = REGULATOR_STATUS_OFF;
  	} else if (ret > 0) {
  		ret = da9063_buck_get_mode(rdev);
  		if (ret > 0)
  			ret = regulator_mode_to_status(ret);
  		else if (ret == 0)
  			ret = -EIO;
  	}
  
  	return ret;
  }
  
  static int da9063_ldo_get_status(struct regulator_dev *rdev)
  {
  	int ret = regulator_is_enabled_regmap(rdev);
  
  	if (ret == 0) {
  		ret = REGULATOR_STATUS_OFF;
  	} else if (ret > 0) {
  		ret = da9063_ldo_get_mode(rdev);
  		if (ret > 0)
  			ret = regulator_mode_to_status(ret);
  		else if (ret == 0)
  			ret = -EIO;
  	}
  
  	return ret;
  }
  
  static int da9063_set_suspend_voltage(struct regulator_dev *rdev, int uV)
  {
  	struct da9063_regulator *regl = rdev_get_drvdata(rdev);
  	const struct da9063_regulator_info *rinfo = regl->info;
  	int ret, sel;
  
  	sel = regulator_map_voltage_linear(rdev, uV, uV);
  	if (sel < 0)

  		return sel;

  
  	sel <<= ffs(rdev->desc->vsel_mask) - 1;
  
  	ret = regmap_update_bits(regl->hw->regmap, rinfo->suspend_vsel_reg,
  				 rdev->desc->vsel_mask, sel);
  
  	return ret;
  }
  
  static int da9063_suspend_enable(struct regulator_dev *rdev)
  {
  	struct da9063_regulator *regl = rdev_get_drvdata(rdev);
  
  	return regmap_field_write(regl->suspend, 1);
  }
  
  static int da9063_suspend_disable(struct regulator_dev *rdev)
  {
  	struct da9063_regulator *regl = rdev_get_drvdata(rdev);
  
  	return regmap_field_write(regl->suspend, 0);
  }
  
  static int da9063_buck_set_suspend_mode(struct regulator_dev *rdev, unsigned mode)
  {
  	struct da9063_regulator *regl = rdev_get_drvdata(rdev);
  	int val;
  
  	switch (mode) {
  	case REGULATOR_MODE_FAST:
  		val = BUCK_MODE_SYNC;
  		break;
  	case REGULATOR_MODE_NORMAL:
  		val = BUCK_MODE_AUTO;
  		break;
  	case REGULATOR_MODE_STANDBY:
  		val = BUCK_MODE_SLEEP;
  		break;
  	default:
  		return -EINVAL;
  	}
  
  	return regmap_field_write(regl->mode, val);
  }
  
  static int da9063_ldo_set_suspend_mode(struct regulator_dev *rdev, unsigned mode)
  {
  	struct da9063_regulator *regl = rdev_get_drvdata(rdev);
  	unsigned val;
  
  	switch (mode) {
  	case REGULATOR_MODE_NORMAL:
  		val = 0;
  		break;
  	case REGULATOR_MODE_STANDBY:
  		val = 1;
  		break;
  	default:
  		return -EINVAL;
  	}
  
  	return regmap_field_write(regl->suspend_sleep, val);
  }

  static const struct regulator_ops da9063_buck_ops = {

  	.enable			= regulator_enable_regmap,
  	.disable		= regulator_disable_regmap,
  	.is_enabled		= regulator_is_enabled_regmap,
  	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
  	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
  	.list_voltage		= regulator_list_voltage_linear,

  	.set_current_limit	= regulator_set_current_limit_regmap,
  	.get_current_limit	= regulator_get_current_limit_regmap,

  	.set_mode		= da9063_buck_set_mode,
  	.get_mode		= da9063_buck_get_mode,
  	.get_status		= da9063_buck_get_status,
  	.set_suspend_voltage	= da9063_set_suspend_voltage,
  	.set_suspend_enable	= da9063_suspend_enable,
  	.set_suspend_disable	= da9063_suspend_disable,
  	.set_suspend_mode	= da9063_buck_set_suspend_mode,
  };

  static const struct regulator_ops da9063_ldo_ops = {

  	.enable			= regulator_enable_regmap,
  	.disable		= regulator_disable_regmap,
  	.is_enabled		= regulator_is_enabled_regmap,
  	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
  	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
  	.list_voltage		= regulator_list_voltage_linear,
  	.set_mode		= da9063_ldo_set_mode,
  	.get_mode		= da9063_ldo_get_mode,
  	.get_status		= da9063_ldo_get_status,
  	.set_suspend_voltage	= da9063_set_suspend_voltage,
  	.set_suspend_enable	= da9063_suspend_enable,
  	.set_suspend_disable	= da9063_suspend_disable,
  	.set_suspend_mode	= da9063_ldo_set_suspend_mode,
  };
  
  /* Info of regulators for DA9063 */
  static const struct da9063_regulator_info da9063_regulator_info[] = {
  	{
  		DA9063_BUCK(DA9063, BCORE1, 300, 10, 1570,

  			    da9063_buck_a_limits,
  			    DA9063_REG_BUCK_ILIM_C, DA9063_BCORE1_ILIM_MASK),

  		DA9063_BUCK_COMMON_FIELDS(BCORE1),
  		.suspend = BFIELD(DA9063_REG_DVC_1, DA9063_VBCORE1_SEL),

  	},
  	{
  		DA9063_BUCK(DA9063, BCORE2, 300, 10, 1570,

  			    da9063_buck_a_limits,
  			    DA9063_REG_BUCK_ILIM_C, DA9063_BCORE2_ILIM_MASK),

  		DA9063_BUCK_COMMON_FIELDS(BCORE2),
  		.suspend = BFIELD(DA9063_REG_DVC_1, DA9063_VBCORE2_SEL),

  	},
  	{
  		DA9063_BUCK(DA9063, BPRO, 530, 10, 1800,

  			    da9063_buck_a_limits,
  			    DA9063_REG_BUCK_ILIM_B, DA9063_BPRO_ILIM_MASK),

  		DA9063_BUCK_COMMON_FIELDS(BPRO),
  		.suspend = BFIELD(DA9063_REG_DVC_1, DA9063_VBPRO_SEL),

  	},
  	{
  		DA9063_BUCK(DA9063, BMEM, 800, 20, 3340,

  			    da9063_buck_b_limits,
  			    DA9063_REG_BUCK_ILIM_A, DA9063_BMEM_ILIM_MASK),

  		DA9063_BUCK_COMMON_FIELDS(BMEM),
  		.suspend = BFIELD(DA9063_REG_DVC_1, DA9063_VBMEM_SEL),

  	},
  	{
  		DA9063_BUCK(DA9063, BIO, 800, 20, 3340,

  			    da9063_buck_b_limits,
  			    DA9063_REG_BUCK_ILIM_A, DA9063_BIO_ILIM_MASK),

  		DA9063_BUCK_COMMON_FIELDS(BIO),
  		.suspend = BFIELD(DA9063_REG_DVC_2, DA9063_VBIO_SEL),

  	},
  	{
  		DA9063_BUCK(DA9063, BPERI, 800, 20, 3340,

  			    da9063_buck_b_limits,
  			    DA9063_REG_BUCK_ILIM_B, DA9063_BPERI_ILIM_MASK),

  		DA9063_BUCK_COMMON_FIELDS(BPERI),
  		.suspend = BFIELD(DA9063_REG_DVC_1, DA9063_VBPERI_SEL),

  	},
  	{
  		DA9063_BUCK(DA9063, BCORES_MERGED, 300, 10, 1570,

  			    da9063_bcores_merged_limits,
  			    DA9063_REG_BUCK_ILIM_C, DA9063_BCORE1_ILIM_MASK),

  		/* BCORES_MERGED uses the same register fields as BCORE1 */
  		DA9063_BUCK_COMMON_FIELDS(BCORE1),
  		.suspend = BFIELD(DA9063_REG_DVC_1, DA9063_VBCORE1_SEL),

  	},
  	{
  		DA9063_BUCK(DA9063, BMEM_BIO_MERGED, 800, 20, 3340,

  			    da9063_bmem_bio_merged_limits,
  			    DA9063_REG_BUCK_ILIM_A, DA9063_BMEM_ILIM_MASK),

  		/* BMEM_BIO_MERGED uses the same register fields as BMEM */
  		DA9063_BUCK_COMMON_FIELDS(BMEM),
  		.suspend = BFIELD(DA9063_REG_DVC_1, DA9063_VBMEM_SEL),

  	},
  	{

  		DA9063_LDO(DA9063, LDO3, 900, 20, 3440),
  		.suspend = BFIELD(DA9063_REG_DVC_1, DA9063_VLDO3_SEL),
  		.oc_event = BFIELD(DA9063_REG_STATUS_D, DA9063_LDO3_LIM),
  	},
  	{
  		DA9063_LDO(DA9063, LDO7, 900, 50, 3600),
  		.suspend = BFIELD(DA9063_REG_LDO7_CONT, DA9063_VLDO7_SEL),
  		.oc_event = BFIELD(DA9063_REG_STATUS_D, DA9063_LDO7_LIM),
  	},
  	{
  		DA9063_LDO(DA9063, LDO8, 900, 50, 3600),
  		.suspend = BFIELD(DA9063_REG_LDO8_CONT, DA9063_VLDO8_SEL),
  		.oc_event = BFIELD(DA9063_REG_STATUS_D, DA9063_LDO8_LIM),
  	},
  	{
  		DA9063_LDO(DA9063, LDO9, 950, 50, 3600),
  		.suspend = BFIELD(DA9063_REG_LDO9_CONT, DA9063_VLDO9_SEL),
  	},
  	{
  		DA9063_LDO(DA9063, LDO11, 900, 50, 3600),
  		.suspend = BFIELD(DA9063_REG_LDO11_CONT, DA9063_VLDO11_SEL),
  		.oc_event = BFIELD(DA9063_REG_STATUS_D, DA9063_LDO11_LIM),
  	},
  
  	/* The following LDOs are present only on DA9063, not on DA9063L */
  	{

  		DA9063_LDO(DA9063, LDO1, 600, 20, 1860),
  		.suspend = BFIELD(DA9063_REG_DVC_1, DA9063_VLDO1_SEL),
  	},
  	{
  		DA9063_LDO(DA9063, LDO2, 600, 20, 1860),
  		.suspend = BFIELD(DA9063_REG_DVC_1, DA9063_VLDO2_SEL),
  	},
  	{

  		DA9063_LDO(DA9063, LDO4, 900, 20, 3440),
  		.suspend = BFIELD(DA9063_REG_DVC_2, DA9063_VLDO4_SEL),
  		.oc_event = BFIELD(DA9063_REG_STATUS_D, DA9063_LDO4_LIM),
  	},
  	{
  		DA9063_LDO(DA9063, LDO5, 900, 50, 3600),
  		.suspend = BFIELD(DA9063_REG_LDO5_CONT, DA9063_VLDO5_SEL),
  	},
  	{
  		DA9063_LDO(DA9063, LDO6, 900, 50, 3600),
  		.suspend = BFIELD(DA9063_REG_LDO6_CONT, DA9063_VLDO6_SEL),
  	},

  	{
  		DA9063_LDO(DA9063, LDO10, 900, 50, 3600),
  		.suspend = BFIELD(DA9063_REG_LDO10_CONT, DA9063_VLDO10_SEL),
  	},

  };
  
  /* Link chip model with regulators info table */
  static struct da9063_dev_model regulators_models[] = {
  	{
  		.regulator_info = da9063_regulator_info,
  		.n_regulators = ARRAY_SIZE(da9063_regulator_info),

  		.type = PMIC_TYPE_DA9063,

  	},

  	{
  		.regulator_info = da9063_regulator_info,
  		.n_regulators = ARRAY_SIZE(da9063_regulator_info) - 6,
  		.type = PMIC_TYPE_DA9063L,
  	},

  	{ }
  };
  
  /* Regulator interrupt handlers */

  static irqreturn_t da9063_ldo_lim_event(int irq, void *data)

  {
  	struct da9063_regulators *regulators = data;
  	struct da9063 *hw = regulators->regulator[0].hw;
  	struct da9063_regulator *regl;
  	int bits, i , ret;
  
  	ret = regmap_read(hw->regmap, DA9063_REG_STATUS_D, &bits);
  	if (ret < 0)
  		return IRQ_NONE;
  
  	for (i = regulators->n_regulators - 1; i >= 0; i--) {
  		regl = &regulators->regulator[i];
  		if (regl->info->oc_event.reg != DA9063_REG_STATUS_D)
  			continue;

  		if (BIT(regl->info->oc_event.lsb) & bits) {
  		        regulator_lock(regl->rdev);

  			regulator_notifier_call_chain(regl->rdev,
  					REGULATOR_EVENT_OVER_CURRENT, NULL);

  		        regulator_unlock(regl->rdev);
  		}

  	}
  
  	return IRQ_HANDLED;
  }
  
  /*
   * Probing and Initialisation functions
   */
  static const struct regulator_init_data *da9063_get_regulator_initdata(
  		const struct da9063_regulators_pdata *regl_pdata, int id)
  {
  	int i;
  
  	for (i = 0; i < regl_pdata->n_regulators; i++) {
  		if (id == regl_pdata->regulator_data[i].id)
  			return regl_pdata->regulator_data[i].initdata;
  	}
  
  	return NULL;
  }

  static struct of_regulator_match da9063_matches[] = {
  	[DA9063_ID_BCORE1]           = { .name = "bcore1"           },
  	[DA9063_ID_BCORE2]           = { .name = "bcore2"           },
  	[DA9063_ID_BPRO]             = { .name = "bpro",            },
  	[DA9063_ID_BMEM]             = { .name = "bmem",            },
  	[DA9063_ID_BIO]              = { .name = "bio",             },
  	[DA9063_ID_BPERI]            = { .name = "bperi",           },
  	[DA9063_ID_BCORES_MERGED]    = { .name = "bcores-merged"    },
  	[DA9063_ID_BMEM_BIO_MERGED]  = { .name = "bmem-bio-merged", },

  	[DA9063_ID_LDO3]             = { .name = "ldo3",            },
  	[DA9063_ID_LDO7]             = { .name = "ldo7",            },
  	[DA9063_ID_LDO8]             = { .name = "ldo8",            },
  	[DA9063_ID_LDO9]             = { .name = "ldo9",            },
  	[DA9063_ID_LDO11]            = { .name = "ldo11",           },
  	/* The following LDOs are present only on DA9063, not on DA9063L */

  	[DA9063_ID_LDO1]             = { .name = "ldo1",            },
  	[DA9063_ID_LDO2]             = { .name = "ldo2",            },

  	[DA9063_ID_LDO4]             = { .name = "ldo4",            },
  	[DA9063_ID_LDO5]             = { .name = "ldo5",            },
  	[DA9063_ID_LDO6]             = { .name = "ldo6",            },

  	[DA9063_ID_LDO10]            = { .name = "ldo10",           },

  };
  
  static struct da9063_regulators_pdata *da9063_parse_regulators_dt(
  		struct platform_device *pdev,
  		struct of_regulator_match **da9063_reg_matches)
  {

  	struct da9063 *da9063 = dev_get_drvdata(pdev->dev.parent);

  	struct da9063_regulators_pdata *pdata;
  	struct da9063_regulator_data *rdata;
  	struct device_node *node;

  	int da9063_matches_len = ARRAY_SIZE(da9063_matches);

  	int i, n, num;

  	if (da9063->type == PMIC_TYPE_DA9063L)
  		da9063_matches_len -= 6;

  	node = of_get_child_by_name(pdev->dev.parent->of_node, "regulators");

  	if (!node) {
  		dev_err(&pdev->dev, "Regulators device node not found
  ");
  		return ERR_PTR(-ENODEV);
  	}
  
  	num = of_regulator_match(&pdev->dev, node, da9063_matches,

  				 da9063_matches_len);

  	of_node_put(node);

  	if (num < 0) {
  		dev_err(&pdev->dev, "Failed to match regulators
  ");
  		return ERR_PTR(-EINVAL);
  	}
  
  	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
  	if (!pdata)
  		return ERR_PTR(-ENOMEM);

  	pdata->regulator_data = devm_kcalloc(&pdev->dev,
  					num, sizeof(*pdata->regulator_data),

  					GFP_KERNEL);
  	if (!pdata->regulator_data)
  		return ERR_PTR(-ENOMEM);
  	pdata->n_regulators = num;
  
  	n = 0;

  	for (i = 0; i < da9063_matches_len; i++) {

  		if (!da9063_matches[i].init_data)
  			continue;
  
  		rdata = &pdata->regulator_data[n];
  		rdata->id = i;
  		rdata->initdata = da9063_matches[i].init_data;
  
  		n++;

  	}

  
  	*da9063_reg_matches = da9063_matches;
  	return pdata;
  }

  
  static int da9063_regulator_probe(struct platform_device *pdev)
  {
  	struct da9063 *da9063 = dev_get_drvdata(pdev->dev.parent);

  	struct of_regulator_match *da9063_reg_matches = NULL;

  	struct da9063_regulators_pdata *regl_pdata;
  	const struct da9063_dev_model *model;
  	struct da9063_regulators *regulators;
  	struct da9063_regulator *regl;
  	struct regulator_config config;
  	bool bcores_merged, bmem_bio_merged;
  	int id, irq, n, n_regulators, ret, val;

  	regl_pdata = da9063_parse_regulators_dt(pdev, &da9063_reg_matches);

  
  	if (IS_ERR(regl_pdata) || regl_pdata->n_regulators == 0) {
  		dev_err(&pdev->dev,
  			"No regulators defined for the platform
  ");

  		return -ENODEV;

  	}
  
  	/* Find regulators set for particular device model */
  	for (model = regulators_models; model->regulator_info; model++) {

  		if (model->type == da9063->type)

  			break;
  	}
  	if (!model->regulator_info) {
  		dev_err(&pdev->dev, "Chip model not recognised (%u)
  ",

  			da9063->type);

  		return -ENODEV;
  	}
  
  	ret = regmap_read(da9063->regmap, DA9063_REG_CONFIG_H, &val);
  	if (ret < 0) {
  		dev_err(&pdev->dev,
  			"Error while reading BUCKs configuration
  ");

  		return ret;

  	}
  	bcores_merged = val & DA9063_BCORE_MERGE;
  	bmem_bio_merged = val & DA9063_BUCK_MERGE;
  
  	n_regulators = model->n_regulators;
  	if (bcores_merged)
  		n_regulators -= 2; /* remove BCORE1, BCORE2 */
  	else
  		n_regulators--;    /* remove BCORES_MERGED */
  	if (bmem_bio_merged)
  		n_regulators -= 2; /* remove BMEM, BIO */
  	else
  		n_regulators--;    /* remove BMEM_BIO_MERGED */
  
  	/* Allocate memory required by usable regulators */

  	regulators = devm_kzalloc(&pdev->dev, struct_size(regulators,
  				  regulator, n_regulators), GFP_KERNEL);

  	if (!regulators)

  		return -ENOMEM;

  
  	regulators->n_regulators = n_regulators;
  	platform_set_drvdata(pdev, regulators);
  
  	/* Register all regulators declared in platform information */
  	n = 0;
  	id = 0;
  	while (n < regulators->n_regulators) {
  		/* Skip regulator IDs depending on merge mode configuration */
  		switch (id) {
  		case DA9063_ID_BCORE1:
  		case DA9063_ID_BCORE2:
  			if (bcores_merged) {
  				id++;
  				continue;
  			}
  			break;
  		case DA9063_ID_BMEM:
  		case DA9063_ID_BIO:
  			if (bmem_bio_merged) {
  				id++;
  				continue;
  			}
  			break;
  		case DA9063_ID_BCORES_MERGED:
  			if (!bcores_merged) {
  				id++;
  				continue;
  			}
  			break;
  		case DA9063_ID_BMEM_BIO_MERGED:
  			if (!bmem_bio_merged) {
  				id++;
  				continue;
  			}
  			break;
  		}
  
  		/* Initialise regulator structure */
  		regl = &regulators->regulator[n];
  		regl->hw = da9063;
  		regl->info = &model->regulator_info[id];
  		regl->desc = regl->info->desc;
  		regl->desc.type = REGULATOR_VOLTAGE;
  		regl->desc.owner = THIS_MODULE;

  		if (regl->info->mode.reg) {

  			regl->mode = devm_regmap_field_alloc(&pdev->dev,
  					da9063->regmap, regl->info->mode);

  			if (IS_ERR(regl->mode))
  				return PTR_ERR(regl->mode);
  		}
  
  		if (regl->info->suspend.reg) {

  			regl->suspend = devm_regmap_field_alloc(&pdev->dev,
  					da9063->regmap, regl->info->suspend);

  			if (IS_ERR(regl->suspend))
  				return PTR_ERR(regl->suspend);
  		}
  
  		if (regl->info->sleep.reg) {

  			regl->sleep = devm_regmap_field_alloc(&pdev->dev,
  					da9063->regmap, regl->info->sleep);

  			if (IS_ERR(regl->sleep))
  				return PTR_ERR(regl->sleep);
  		}
  
  		if (regl->info->suspend_sleep.reg) {

  			regl->suspend_sleep = devm_regmap_field_alloc(&pdev->dev,
  					da9063->regmap, regl->info->suspend_sleep);

  			if (IS_ERR(regl->suspend_sleep))
  				return PTR_ERR(regl->suspend_sleep);
  		}

  		/* Register regulator */
  		memset(&config, 0, sizeof(config));
  		config.dev = &pdev->dev;
  		config.init_data = da9063_get_regulator_initdata(regl_pdata, id);
  		config.driver_data = regl;
  		if (da9063_reg_matches)
  			config.of_node = da9063_reg_matches[id].of_node;
  		config.regmap = da9063->regmap;

  		regl->rdev = devm_regulator_register(&pdev->dev, &regl->desc,
  						     &config);

  		if (IS_ERR(regl->rdev)) {

  			dev_err(&pdev->dev,
  				"Failed to register %s regulator
  ",
  				regl->desc.name);

  			return PTR_ERR(regl->rdev);

  		}
  		id++;
  		n++;
  	}
  
  	/* LDOs overcurrent event support */
  	irq = platform_get_irq_byname(pdev, "LDO_LIM");

  	if (irq < 0)

  		return irq;

  	ret = devm_request_threaded_irq(&pdev->dev, irq,

  				NULL, da9063_ldo_lim_event,
  				IRQF_TRIGGER_LOW | IRQF_ONESHOT,
  				"LDO_LIM", regulators);
  	if (ret) {

  		dev_err(&pdev->dev, "Failed to request LDO_LIM IRQ.
  ");
  		return ret;

  	}
  
  	return 0;

  }

  static struct platform_driver da9063_regulator_driver = {
  	.driver = {
  		.name = DA9063_DRVNAME_REGULATORS,

  	},
  	.probe = da9063_regulator_probe,

  };
  
  static int __init da9063_regulator_init(void)
  {
  	return platform_driver_register(&da9063_regulator_driver);
  }
  subsys_initcall(da9063_regulator_init);
  
  static void __exit da9063_regulator_cleanup(void)
  {
  	platform_driver_unregister(&da9063_regulator_driver);
  }
  module_exit(da9063_regulator_cleanup);
  
  
  /* Module information */
  MODULE_AUTHOR("Krystian Garbaciak <krystian.garbaciak@diasemi.com>");
  MODULE_DESCRIPTION("DA9063 regulators driver");
  MODULE_LICENSE("GPL");

  MODULE_ALIAS("platform:" DA9063_DRVNAME_REGULATORS);