regulator: Support ROHM BD71815 regulators

Support voltage control for regulators on ROHM BD71815 PMIC.

ROHM BD71815 contains 5 bucks, 7 LDOs and a boost (intended for LED).
Bucks 1 and 2 support HW state based voltage level and enable states. Other
regulators support HW state based enable states. All bucks and LDOs 1-5
allow voltage changes for RUN state and LDO4 can be enabled/disabled via
GPIO.

LDO3 does support changing between two predetermined voltages by using
a GPIO but this functionality is not included in this commit.

This work is derived from driver originally written by Tony Luo
<luofc@embedinfo.com> - although not much of original work is left.

Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Acked-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

3 files changed, 664 insertions, 0 deletions

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 77c43134bc9e..6437348ce862 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -204,6 +204,17 @@ config REGULATOR_BD70528
 	  This driver can also be built as a module. If so, the module
 	  will be called bd70528-regulator.
 
+config REGULATOR_BD71815
+	tristate "ROHM BD71815 Power Regulator"
+	depends on MFD_ROHM_BD71828
+	help
+	  This driver supports voltage regulators on ROHM BD71815 PMIC.
+	  This will enable support for the software controllable buck
+	  and LDO regulators and a current regulator for LEDs.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called bd71815-regulator.
+
 config REGULATOR_BD71828
 	tristate "ROHM BD71828 Power Regulator"
 	depends on MFD_ROHM_BD71828
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 44d2f8bf4b74..c6f84a332fdd 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -30,6 +30,7 @@ obj-$(CONFIG_REGULATOR_ATC260X) += atc260x-regulator.o
 obj-$(CONFIG_REGULATOR_AXP20X) += axp20x-regulator.o
 obj-$(CONFIG_REGULATOR_BCM590XX) += bcm590xx-regulator.o
 obj-$(CONFIG_REGULATOR_BD70528) += bd70528-regulator.o
+obj-$(CONFIG_REGULATOR_BD71815)	+= bd71815-regulator.o
 obj-$(CONFIG_REGULATOR_BD71828) += bd71828-regulator.o
 obj-$(CONFIG_REGULATOR_BD718XX) += bd718x7-regulator.o
 obj-$(CONFIG_REGULATOR_BD9571MWV) += bd9571mwv-regulator.o
diff --git a/drivers/regulator/bd71815-regulator.c b/drivers/regulator/bd71815-regulator.c
new file mode 100644
index 000000000000..a4e8d5e36b40
--- /dev/null
+++ b/drivers/regulator/bd71815-regulator.c
@@ -0,0 +1,652 @@
+// SPDX-License-Identifier: GPL-2.0-only
+//
+// Copyright 2014 Embest Technology Co. Ltd. Inc.
+// bd71815-regulator.c ROHM BD71815 regulator driver
+//
+// Author: Tony Luo <luofc@embedinfo.com>
+//
+// Partially rewritten at 2021 by
+// Matti Vaittinen <matti.vaitinen@fi.rohmeurope.com>
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/gpio.h>
+#include <linux/mfd/rohm-generic.h>
+#include <linux/mfd/rohm-bd71815.h>
+#include <linux/regulator/of_regulator.h>
+
+struct bd71815_regulator {
+	struct regulator_desc desc;
+	const struct rohm_dvs_config *dvs;
+};
+
+struct bd71815_pmic {
+	struct bd71815_regulator descs[BD71815_REGULATOR_CNT];
+	struct regmap *regmap;
+	struct device *dev;
+	struct gpio_descs *gps;
+	struct regulator_dev *rdev[BD71815_REGULATOR_CNT];
+};
+
+static const int bd7181x_wled_currents[] = {
+	10, 20, 30, 50, 70, 100, 200, 300, 500, 700, 1000, 2000, 3000, 4000,
+	5000, 6000, 7000, 8000, 9000, 10000, 11000, 12000, 13000, 14000, 15000,
+	16000, 17000, 18000, 19000, 20000, 21000, 22000, 23000, 24000, 25000,
+};
+
+static const struct rohm_dvs_config buck1_dvs = {
+	.level_map		= ROHM_DVS_LEVEL_RUN | ROHM_DVS_LEVEL_SNVS |
+				  ROHM_DVS_LEVEL_SUSPEND | ROHM_DVS_LEVEL_LPSR,
+	.run_reg		= BD71815_REG_BUCK1_VOLT_H,
+	.run_mask		= BD71815_VOLT_MASK,
+	.run_on_mask		= BD71815_BUCK_RUN_ON,
+	.snvs_on_mask		= BD71815_BUCK_SNVS_ON,
+	.suspend_reg		= BD71815_REG_BUCK1_VOLT_L,
+	.suspend_mask		= BD71815_VOLT_MASK,
+	.suspend_on_mask	= BD71815_BUCK_SUSP_ON,
+	.lpsr_reg		= BD71815_REG_BUCK1_VOLT_L,
+	.lpsr_mask		= BD71815_VOLT_MASK,
+	.lpsr_on_mask		= BD71815_BUCK_LPSR_ON,
+};
+
+static const struct rohm_dvs_config buck2_dvs = {
+	.level_map		= ROHM_DVS_LEVEL_RUN | ROHM_DVS_LEVEL_SNVS |
+				  ROHM_DVS_LEVEL_SUSPEND | ROHM_DVS_LEVEL_LPSR,
+	.run_reg		= BD71815_REG_BUCK2_VOLT_H,
+	.run_mask		= BD71815_VOLT_MASK,
+	.run_on_mask		= BD71815_BUCK_RUN_ON,
+	.snvs_on_mask		= BD71815_BUCK_SNVS_ON,
+	.suspend_reg		= BD71815_REG_BUCK2_VOLT_L,
+	.suspend_mask		= BD71815_VOLT_MASK,
+	.suspend_on_mask	= BD71815_BUCK_SUSP_ON,
+	.lpsr_reg		= BD71815_REG_BUCK2_VOLT_L,
+	.lpsr_mask		= BD71815_VOLT_MASK,
+	.lpsr_on_mask		= BD71815_BUCK_LPSR_ON,
+};
+
+static const struct rohm_dvs_config buck3_dvs = {
+	.level_map		= ROHM_DVS_LEVEL_RUN | ROHM_DVS_LEVEL_SNVS |
+				  ROHM_DVS_LEVEL_SUSPEND | ROHM_DVS_LEVEL_LPSR,
+	.run_reg		= BD71815_REG_BUCK3_VOLT,
+	.run_mask		= BD71815_VOLT_MASK,
+	.run_on_mask		= BD71815_BUCK_RUN_ON,
+	.snvs_on_mask		= BD71815_BUCK_SNVS_ON,
+	.suspend_on_mask	= BD71815_BUCK_SUSP_ON,
+	.lpsr_on_mask		= BD71815_BUCK_LPSR_ON,
+};
+
+static const struct rohm_dvs_config buck4_dvs = {
+	.level_map		= ROHM_DVS_LEVEL_RUN | ROHM_DVS_LEVEL_SNVS |
+				  ROHM_DVS_LEVEL_SUSPEND | ROHM_DVS_LEVEL_LPSR,
+	.run_reg		= BD71815_REG_BUCK4_VOLT,
+	.run_mask		= BD71815_VOLT_MASK,
+	.run_on_mask		= BD71815_BUCK_RUN_ON,
+	.snvs_on_mask		= BD71815_BUCK_SNVS_ON,
+	.suspend_on_mask	= BD71815_BUCK_SUSP_ON,
+	.lpsr_on_mask		= BD71815_BUCK_LPSR_ON,
+};
+
+static const struct rohm_dvs_config ldo1_dvs = {
+	.level_map		= ROHM_DVS_LEVEL_RUN | ROHM_DVS_LEVEL_SNVS |
+				  ROHM_DVS_LEVEL_SUSPEND | ROHM_DVS_LEVEL_LPSR,
+	.run_reg		= BD71815_REG_LDO_MODE1,
+	.run_mask		= BD71815_VOLT_MASK,
+	.run_on_mask		= LDO1_RUN_ON,
+	.snvs_on_mask		= LDO1_SNVS_ON,
+	.suspend_on_mask	= LDO1_SUSP_ON,
+	.lpsr_on_mask		= LDO1_LPSR_ON,
+};
+
+static const struct rohm_dvs_config ldo2_dvs = {
+	.level_map		= ROHM_DVS_LEVEL_RUN | ROHM_DVS_LEVEL_SNVS |
+				  ROHM_DVS_LEVEL_SUSPEND | ROHM_DVS_LEVEL_LPSR,
+	.run_reg		= BD71815_REG_LDO_MODE2,
+	.run_mask		= BD71815_VOLT_MASK,
+	.run_on_mask		= LDO2_RUN_ON,
+	.snvs_on_mask		= LDO2_SNVS_ON,
+	.suspend_on_mask	= LDO2_SUSP_ON,
+	.lpsr_on_mask		= LDO2_LPSR_ON,
+};
+
+static const struct rohm_dvs_config ldo3_dvs = {
+	.level_map		= ROHM_DVS_LEVEL_RUN | ROHM_DVS_LEVEL_SNVS |
+				  ROHM_DVS_LEVEL_SUSPEND | ROHM_DVS_LEVEL_LPSR,
+	.run_reg		= BD71815_REG_LDO_MODE2,
+	.run_mask		= BD71815_VOLT_MASK,
+	.run_on_mask		= LDO3_RUN_ON,
+	.snvs_on_mask		= LDO3_SNVS_ON,
+	.suspend_on_mask	= LDO3_SUSP_ON,
+	.lpsr_on_mask		= LDO3_LPSR_ON,
+};
+
+static const struct rohm_dvs_config ldo4_dvs = {
+	.level_map		= ROHM_DVS_LEVEL_RUN | ROHM_DVS_LEVEL_SNVS |
+				  ROHM_DVS_LEVEL_SUSPEND | ROHM_DVS_LEVEL_LPSR,
+	.run_reg		= BD71815_REG_LDO_MODE3,
+	.run_mask		= BD71815_VOLT_MASK,
+	.run_on_mask		= LDO4_RUN_ON,
+	.snvs_on_mask		= LDO4_SNVS_ON,
+	.suspend_on_mask	= LDO4_SUSP_ON,
+	.lpsr_on_mask		= LDO4_LPSR_ON,
+};
+
+static const struct rohm_dvs_config ldo5_dvs = {
+	.level_map		= ROHM_DVS_LEVEL_RUN | ROHM_DVS_LEVEL_SNVS |
+				  ROHM_DVS_LEVEL_SUSPEND | ROHM_DVS_LEVEL_LPSR,
+	.run_reg		= BD71815_REG_LDO_MODE3,
+	.run_mask		= BD71815_VOLT_MASK,
+	.run_on_mask		= LDO5_RUN_ON,
+	.snvs_on_mask		= LDO5_SNVS_ON,
+	.suspend_on_mask	= LDO5_SUSP_ON,
+	.lpsr_on_mask		= LDO5_LPSR_ON,
+};
+
+static const struct rohm_dvs_config dvref_dvs = {
+	.level_map		= ROHM_DVS_LEVEL_RUN | ROHM_DVS_LEVEL_SNVS |
+				  ROHM_DVS_LEVEL_SUSPEND | ROHM_DVS_LEVEL_LPSR,
+	.run_on_mask		= DVREF_RUN_ON,
+	.snvs_on_mask		= DVREF_SNVS_ON,
+	.suspend_on_mask	= DVREF_SUSP_ON,
+	.lpsr_on_mask		= DVREF_LPSR_ON,
+};
+
+static const struct rohm_dvs_config ldolpsr_dvs = {
+	.level_map		= ROHM_DVS_LEVEL_RUN | ROHM_DVS_LEVEL_SNVS |
+				  ROHM_DVS_LEVEL_SUSPEND | ROHM_DVS_LEVEL_LPSR,
+	.run_on_mask		= DVREF_RUN_ON,
+	.snvs_on_mask		= DVREF_SNVS_ON,
+	.suspend_on_mask	= DVREF_SUSP_ON,
+	.lpsr_on_mask		= DVREF_LPSR_ON,
+};
+
+static const struct rohm_dvs_config buck5_dvs = {
+	.level_map		= ROHM_DVS_LEVEL_RUN | ROHM_DVS_LEVEL_SNVS |
+				  ROHM_DVS_LEVEL_SUSPEND | ROHM_DVS_LEVEL_LPSR,
+	.run_reg		= BD71815_REG_BUCK5_VOLT,
+	.run_mask		= BD71815_VOLT_MASK,
+	.run_on_mask		= BD71815_BUCK_RUN_ON,
+	.snvs_on_mask		= BD71815_BUCK_SNVS_ON,
+	.suspend_on_mask	= BD71815_BUCK_SUSP_ON,
+	.lpsr_on_mask		= BD71815_BUCK_LPSR_ON,
+};
+
+static int set_hw_dvs_levels(struct device_node *np,
+			     const struct regulator_desc *desc,
+			     struct regulator_config *cfg)
+{
+	struct bd71815_regulator *data;
+
+	data = container_of(desc, struct bd71815_regulator, desc);
+	return rohm_regulator_set_dvs_levels(data->dvs, np, desc, cfg->regmap);
+}
+
+/*
+ * Bucks 1 and 2 have two voltage selection registers where selected
+ * voltage can be set. Which of the registers is used can be either controlled
+ * by a control bit in register - or by HW state. If HW state specific voltages
+ * are given - then we assume HW state based control should be used.
+ *
+ * If volatge value is updated to currently selected register - then output
+ * voltage is immediately changed no matter what is set as ramp rate. Thus we
+ * default changing voltage by writing new value to inactive register and
+ * then updating the 'register selection' bit. This naturally only works when
+ * HW state machine is not used to select the voltage.
+ */
+static int buck12_set_hw_dvs_levels(struct device_node *np,
+				    const struct regulator_desc *desc,
+				    struct regulator_config *cfg)
+{
+	struct bd71815_regulator *data;
+	int ret = 0, val;
+
+	data = container_of(desc, struct bd71815_regulator, desc);
+
+	if (of_find_property(np, "rohm,dvs-run-voltage", NULL) ||
+	    of_find_property(np, "rohm,dvs-suspend-voltage", NULL) ||
+	    of_find_property(np, "rohm,dvs-lpsr-voltage", NULL) ||
+	    of_find_property(np, "rohm,dvs-snvs-voltage", NULL)) {
+		ret = regmap_read(cfg->regmap, desc->vsel_reg, &val);
+		if (ret)
+			return ret;
+
+		if (!(BD71815_BUCK_STBY_DVS & val) &&
+		    !(BD71815_BUCK_DVSSEL & val)) {
+			int val2;
+
+			/*
+			 * We are currently using voltage from _L.
+			 * We'd better copy it to _H and switch to it to
+			 * avoid shutting us down if LPSR or SUSPEND is set to
+			 * disabled. _L value is at reg _H + 1
+			 */
+			ret = regmap_read(cfg->regmap, desc->vsel_reg + 1,
+					  &val2);
+			if (ret)
+				return ret;
+
+			ret = regmap_update_bits(cfg->regmap, desc->vsel_reg,
+						 BD71815_VOLT_MASK |
+						 BD71815_BUCK_DVSSEL,
+						 val2 | BD71815_BUCK_DVSSEL);
+			if (ret)
+				return ret;
+		}
+		ret = rohm_regulator_set_dvs_levels(data->dvs, np, desc,
+						    cfg->regmap);
+		if (ret)
+			return ret;
+		/*
+		 * DVS levels were given => use HW-state machine for voltage
+		 * controls. NOTE: AFAIK, This means that if voltage is changed
+		 * by SW the ramp-rate is not respected. Should we disable
+		 * SW voltage control when the HW state machine is used?
+		 */
+		ret = regmap_update_bits(cfg->regmap, desc->vsel_reg,
+					 BD71815_BUCK_STBY_DVS,
+					 BD71815_BUCK_STBY_DVS);
+	}
+
+	return ret;
+}
+
+/*
+ * BUCK1/2
+ * BUCK1RAMPRATE[1:0] BUCK1 DVS ramp rate setting
+ * 00: 10.00mV/usec	10mV 1uS
+ * 01: 5.00mV/usec	10mV 2uS
+ * 10: 2.50mV/usec	10mV 4uS
+ * 11: 1.25mV/usec	10mV 8uS
+ */
+static const unsigned int bd7181x_ramp_table[] = { 1250, 2500, 5000, 10000 };
+
+static int bd7181x_led_set_current_limit(struct regulator_dev *rdev,
+					int min_uA, int max_uA)
+{
+	int ret;
+	int onstatus;
+
+	onstatus = regulator_is_enabled_regmap(rdev);
+
+	ret = regulator_set_current_limit_regmap(rdev, min_uA, max_uA);
+	if (!ret) {
+		int newstatus;
+
+		newstatus = regulator_is_enabled_regmap(rdev);
+		if (onstatus != newstatus) {
+			/*
+			 * HW FIX: spurious led status change detected. Toggle
+			 * state as a workaround
+			 */
+			if (onstatus)
+				ret = regulator_enable_regmap(rdev);
+			else
+				ret = regulator_disable_regmap(rdev);
+
+			if (ret)
+				dev_err(rdev_get_dev(rdev),
+					"failed to revert the LED state (%d)\n",
+					ret);
+		}
+	}
+
+	return ret;
+}
+
+static int bd7181x_buck12_get_voltage_sel(struct regulator_dev *rdev)
+{
+	struct bd71815_pmic *pmic = rdev_get_drvdata(rdev);
+	int rid = rdev_get_id(rdev);
+	int ret, regh, regl, val;
+
+	regh = BD71815_REG_BUCK1_VOLT_H + rid * 0x2;
+	regl = BD71815_REG_BUCK1_VOLT_L + rid * 0x2;
+
+	ret = regmap_read(pmic->regmap, regh, &val);
+	if (ret)
+		return ret;
+
+	/*
+	 * If we use HW state machine based voltage reg selection - then we
+	 * return BD71815_REG_BUCK1_VOLT_H which is used at RUN.
+	 * Else we do return the BD71815_REG_BUCK1_VOLT_H or
+	 * BD71815_REG_BUCK1_VOLT_L depending on which is selected to be used
+	 * by BD71815_BUCK_DVSSEL bit
+	 */
+	if ((!(val & BD71815_BUCK_STBY_DVS)) && (!(val & BD71815_BUCK_DVSSEL)))
+		ret = regmap_read(pmic->regmap, regl, &val);
+
+	if (ret)
+		return ret;
+
+	return val & BD71815_VOLT_MASK;
+}
+
+/*
+ * For Buck 1/2.
+ */
+static int bd7181x_buck12_set_voltage_sel(struct regulator_dev *rdev,
+					  unsigned int sel)
+{
+	struct bd71815_pmic *pmic = rdev_get_drvdata(rdev);
+	int rid = rdev_get_id(rdev);
+	int ret, val, reg, regh, regl;
+
+	regh = BD71815_REG_BUCK1_VOLT_H + rid*0x2;
+	regl = BD71815_REG_BUCK1_VOLT_L + rid*0x2;
+
+	ret = regmap_read(pmic->regmap, regh, &val);
+	if (ret)
+		return ret;
+
+	/*
+	 * If bucks 1 & 2 are controlled by state machine - then the RUN state
+	 * voltage is set to BD71815_REG_BUCK1_VOLT_H. Changing SUSPEND/LPSR
+	 * voltages at runtime is not supported by this driver.
+	 */
+	if (((val & BD71815_BUCK_STBY_DVS))) {
+		return regmap_update_bits(pmic->regmap, regh, BD71815_VOLT_MASK,
+					  sel);
+	}
+	/* Update new voltage to the register which is not selected now */
+	if (val & BD71815_BUCK_DVSSEL)
+		reg = regl;
+	else
+		reg = regh;
+
+	ret = regmap_update_bits(pmic->regmap, reg, BD71815_VOLT_MASK, sel);
+	if (ret)
+		return ret;
+
+	/* Select the other DVS register to be used */
+	return regmap_update_bits(pmic->regmap, regh, BD71815_BUCK_DVSSEL, ~val);
+}
+
+static const struct regulator_ops bd7181x_ldo_regulator_ops = {
+	.enable = regulator_enable_regmap,
+	.disable = regulator_disable_regmap,
+	.is_enabled = regulator_is_enabled_regmap,
+	.list_voltage = regulator_list_voltage_linear,
+	.set_voltage_sel = regulator_set_voltage_sel_regmap,
+	.get_voltage_sel = regulator_get_voltage_sel_regmap,
+};
+
+static const struct regulator_ops bd7181x_fixed_regulator_ops = {
+	.enable = regulator_enable_regmap,
+	.disable = regulator_disable_regmap,
+	.is_enabled = regulator_is_enabled_regmap,
+	.list_voltage = regulator_list_voltage_linear,
+};
+
+static const struct regulator_ops bd7181x_buck_regulator_ops = {
+	.enable = regulator_enable_regmap,
+	.disable = regulator_disable_regmap,
+	.is_enabled = regulator_is_enabled_regmap,
+	.list_voltage = regulator_list_voltage_linear,
+	.set_voltage_sel = regulator_set_voltage_sel_regmap,
+	.get_voltage_sel = regulator_get_voltage_sel_regmap,
+	.set_voltage_time_sel = regulator_set_voltage_time_sel,
+};
+
+static const struct regulator_ops bd7181x_buck12_regulator_ops = {
+	.enable = regulator_enable_regmap,
+	.disable = regulator_disable_regmap,
+	.is_enabled = regulator_is_enabled_regmap,
+	.list_voltage = regulator_list_voltage_linear,
+	.set_voltage_sel = bd7181x_buck12_set_voltage_sel,
+	.get_voltage_sel = bd7181x_buck12_get_voltage_sel,
+	.set_voltage_time_sel = regulator_set_voltage_time_sel,
+	.set_ramp_delay = regulator_set_ramp_delay_regmap,
+};
+
+static const struct regulator_ops bd7181x_led_regulator_ops = {
+	.enable = regulator_enable_regmap,
+	.disable = regulator_disable_regmap,
+	.is_enabled = regulator_is_enabled_regmap,
+	.set_current_limit = bd7181x_led_set_current_limit,
+	.get_current_limit = regulator_get_current_limit_regmap,
+};
+
+#define BD71815_FIXED_REG(_name, _id, ereg, emsk, voltage, _dvs)	\
+	[(_id)] = {							\
+		.desc = {						\
+			.name = #_name,					\
+			.of_match = of_match_ptr(#_name),		\
+			.regulators_node = of_match_ptr("regulators"),	\
+			.n_voltages = 1,				\
+			.ops = &bd7181x_fixed_regulator_ops,		\
+			.type = REGULATOR_VOLTAGE,			\
+			.id = (_id),					\
+			.owner = THIS_MODULE,				\
+			.min_uV = (voltage),				\
+			.enable_reg = (ereg),				\
+			.enable_mask = (emsk),				\
+			.of_parse_cb = set_hw_dvs_levels,		\
+		},							\
+		.dvs = (_dvs),						\
+	}
+
+#define BD71815_BUCK_REG(_name, _id, vsel, ereg, min, max, step, _dvs)	\
+	[(_id)] = {							\
+		.desc = {						\
+			.name = #_name,					\
+			.of_match = of_match_ptr(#_name),		\
+			.regulators_node = of_match_ptr("regulators"),	\
+			.n_voltages = ((max) - (min)) / (step) + 1,	\
+			.ops = &bd7181x_buck_regulator_ops,		\
+			.type = REGULATOR_VOLTAGE,			\
+			.id = (_id),					\
+			.owner = THIS_MODULE,				\
+			.min_uV = (min),				\
+			.uV_step = (step),				\
+			.vsel_reg = (vsel),				\
+			.vsel_mask = BD71815_VOLT_MASK,			\
+			.enable_reg = (ereg),				\
+			.enable_mask = BD71815_BUCK_RUN_ON,		\
+			.of_parse_cb = set_hw_dvs_levels,		\
+		},							\
+		.dvs = (_dvs),						\
+	}
+
+#define BD71815_BUCK12_REG(_name, _id, vsel, ereg, min, max, step,	\
+			   _dvs)					\
+	[(_id)] = {							\
+		.desc = {						\
+			.name = #_name,					\
+			.of_match = of_match_ptr(#_name),		\
+			.regulators_node = of_match_ptr("regulators"),	\
+			.n_voltages = ((max) - (min)) / (step) + 1,	\
+			.ops = &bd7181x_buck12_regulator_ops,		\
+			.type = REGULATOR_VOLTAGE,			\
+			.id = (_id),					\
+			.owner = THIS_MODULE,				\
+			.min_uV = (min),				\
+			.uV_step = (step),				\
+			.vsel_reg = (vsel),				\
+			.vsel_mask = 0x3f,				\
+			.enable_reg = (ereg),				\
+			.enable_mask = 0x04,				\
+			.ramp_reg = (ereg),				\
+			.ramp_mask = BD71815_BUCK_RAMPRATE_MASK,	\
+			.ramp_delay_table = bd7181x_ramp_table,		\
+			.n_ramp_values = ARRAY_SIZE(bd7181x_ramp_table),\
+			.of_parse_cb = buck12_set_hw_dvs_levels,	\
+		},							\
+		.dvs = (_dvs),						\
+	}
+
+#define BD71815_LED_REG(_name, _id, csel, mask, ereg, emsk, currents)	\
+	[(_id)] = {							\
+		.desc = {						\
+			.name = #_name,					\
+			.of_match = of_match_ptr(#_name),		\
+			.regulators_node = of_match_ptr("regulators"),	\
+			.n_current_limits = ARRAY_SIZE(currents),	\
+			.ops = &bd7181x_led_regulator_ops,		\
+			.type = REGULATOR_CURRENT,			\
+			.id = (_id),					\
+			.owner = THIS_MODULE,				\
+			.curr_table = currents,				\
+			.csel_reg = (csel),				\
+			.csel_mask = (mask),				\
+			.enable_reg = (ereg),				\
+			.enable_mask = (emsk),				\
+		},							\
+	}
+
+#define BD71815_LDO_REG(_name, _id, vsel, ereg, emsk, min, max, step,	\
+			_dvs)						\
+	[(_id)] = {							\
+		.desc = {						\
+			.name = #_name,					\
+			.of_match = of_match_ptr(#_name),		\
+			.regulators_node = of_match_ptr("regulators"),	\
+			.n_voltages = ((max) - (min)) / (step) + 1,	\
+			.ops = &bd7181x_ldo_regulator_ops,		\
+			.type = REGULATOR_VOLTAGE,			\
+			.id = (_id),					\
+			.owner = THIS_MODULE,				\
+			.min_uV = (min),				\
+			.uV_step = (step),				\
+			.vsel_reg = (vsel),				\
+			.vsel_mask = BD71815_VOLT_MASK,			\
+			.enable_reg = (ereg),				\
+			.enable_mask = (emsk),				\
+			.of_parse_cb = set_hw_dvs_levels,		\
+		},							\
+		.dvs = (_dvs),						\
+	}
+
+static struct bd71815_regulator bd71815_regulators[] = {
+	BD71815_BUCK12_REG(buck1, BD71815_BUCK1, BD71815_REG_BUCK1_VOLT_H,
+			   BD71815_REG_BUCK1_MODE, 800000, 2000000, 25000,
+			   &buck1_dvs),
+	BD71815_BUCK12_REG(buck2, BD71815_BUCK2, BD71815_REG_BUCK2_VOLT_H,
+			   BD71815_REG_BUCK2_MODE, 800000, 2000000, 25000,
+			   &buck2_dvs),
+	BD71815_BUCK_REG(buck3, BD71815_BUCK3, BD71815_REG_BUCK3_VOLT,
+			 BD71815_REG_BUCK3_MODE,  1200000, 2700000, 50000,
+			 &buck3_dvs),
+	BD71815_BUCK_REG(buck4, BD71815_BUCK4, BD71815_REG_BUCK4_VOLT,
+			 BD71815_REG_BUCK4_MODE,  1100000, 1850000, 25000,
+			 &buck4_dvs),
+	BD71815_BUCK_REG(buck5, BD71815_BUCK5, BD71815_REG_BUCK5_VOLT,
+			 BD71815_REG_BUCK5_MODE,  1800000, 3300000, 50000,
+			 &buck5_dvs),
+	BD71815_LDO_REG(ldo1, BD71815_LDO1, BD71815_REG_LDO1_VOLT,
+			BD71815_REG_LDO_MODE1, LDO1_RUN_ON, 800000, 3300000,
+			50000, &ldo1_dvs),
+	BD71815_LDO_REG(ldo2, BD71815_LDO2, BD71815_REG_LDO2_VOLT,
+			BD71815_REG_LDO_MODE2, LDO2_RUN_ON, 800000, 3300000,
+			50000, &ldo2_dvs),
+	/*
+	 * Let's default LDO3 to be enabled by SW. We can override ops if DT
+	 * says LDO3 should be enabled by HW when DCIN is connected.
+	 */
+	BD71815_LDO_REG(ldo3, BD71815_LDO3, BD71815_REG_LDO3_VOLT,
+			BD71815_REG_LDO_MODE2, LDO3_RUN_ON, 800000, 3300000,
+			50000, &ldo3_dvs),
+	BD71815_LDO_REG(ldo4, BD71815_LDO4, BD71815_REG_LDO4_VOLT,
+			BD71815_REG_LDO_MODE3, LDO4_RUN_ON, 800000, 3300000,
+			50000, &ldo4_dvs),
+	BD71815_LDO_REG(ldo5, BD71815_LDO5, BD71815_REG_LDO5_VOLT_H,
+			BD71815_REG_LDO_MODE3, LDO5_RUN_ON, 800000, 3300000,
+			50000, &ldo5_dvs),
+	BD71815_FIXED_REG(ldodvref, BD71815_LDODVREF, BD71815_REG_LDO_MODE4,
+			  DVREF_RUN_ON, 3000000, &dvref_dvs),
+	BD71815_FIXED_REG(ldolpsr, BD71815_LDOLPSR, BD71815_REG_LDO_MODE4,
+			  LDO_LPSR_RUN_ON, 1800000, &ldolpsr_dvs),
+	BD71815_LED_REG(wled, BD71815_WLED, BD71815_REG_LED_DIMM, LED_DIMM_MASK,
+			BD71815_REG_LED_CTRL, LED_RUN_ON,
+			bd7181x_wled_currents),
+};
+
+static int bd7181x_probe(struct platform_device *pdev)
+{
+	struct bd71815_pmic *pmic;
+	struct regulator_config config = {};
+	int i, ret;
+	struct gpio_desc *ldo4_en;
+
+	pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL);
+	if (!pmic)
+		return -ENOMEM;
+
+	memcpy(pmic->descs, bd71815_regulators,	sizeof(pmic->descs));
+
+	pmic->dev = &pdev->dev;
+	pmic->regmap = dev_get_regmap(pdev->dev.parent, NULL);
+	if (!pmic->regmap) {
+		dev_err(pmic->dev, "No parent regmap\n");
+		return -ENODEV;
+	}
+	platform_set_drvdata(pdev, pmic);
+	ldo4_en = devm_gpiod_get_from_of_node(&pdev->dev,
+					      pdev->dev.parent->of_node,
+						 "rohm,vsel-gpios", 0,
+						 GPIOD_ASIS, "ldo4-en");
+
+	if (IS_ERR(ldo4_en)) {
+		ret = PTR_ERR(ldo4_en);
+		if (ret != -ENOENT)
+			return ret;
+		ldo4_en = NULL;
+	}
+
+	/* Disable to go to ship-mode */
+	ret = regmap_update_bits(pmic->regmap, BD71815_REG_PWRCTRL,
+				 RESTARTEN, 0);
+	if (ret)
+		return ret;
+
+	config.dev = pdev->dev.parent;
+	config.regmap = pmic->regmap;
+
+	for (i = 0; i < BD71815_REGULATOR_CNT; i++) {
+		struct regulator_desc *desc;
+		struct regulator_dev *rdev;
+
+		desc = &pmic->descs[i].desc;
+		if (i == BD71815_LDO4)
+			config.ena_gpiod = ldo4_en;
+
+		config.driver_data = pmic;
+
+		rdev = devm_regulator_register(&pdev->dev, desc, &config);
+		if (IS_ERR(rdev)) {
+			dev_err(&pdev->dev,
+				"failed to register %s regulator\n",
+				desc->name);
+			return PTR_ERR(rdev);
+		}
+		config.ena_gpiod = NULL;
+		pmic->rdev[i] = rdev;
+	}
+	return 0;
+}
+
+static const struct platform_device_id bd7181x_pmic_id[] = {
+	{ "bd71815-pmic", ROHM_CHIP_TYPE_BD71815 },
+	{ },
+};
+MODULE_DEVICE_TABLE(platform, bd7181x_pmic_id);
+
+static struct platform_driver bd7181x_regulator = {
+	.driver = {
+		.name = "bd7181x-pmic",
+		.owner = THIS_MODULE,
+	},
+	.probe = bd7181x_probe,
+	.id_table = bd7181x_pmic_id,
+};
+module_platform_driver(bd7181x_regulator);
+
+MODULE_AUTHOR("Tony Luo <luofc@embedinfo.com>");
+MODULE_DESCRIPTION("BD71815 voltage regulator driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:bd7181x-pmic");