MLK-22824-2: regulator: pca9450: add pca9450 regulator driver

Add pca9450 regulator driver.

Signed-off-by: John Lee <john.lee@nxp.com>
Signed-off-by: Robin Gong <yibin.gong@nxp.com>
Reviewed-by: Anson Huang <anson.huang@nxp.com>
(cherry picked from commit 90f61a4155308cfd0e33116540ec0c939204ce73)

3 files changed, 790 insertions, 0 deletions

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 59c363f65dc0..96cdc0e1f7e8 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -678,6 +678,12 @@ config REGULATOR_PCAP
 	 This driver provides support for the voltage regulators of the
 	 PCAP2 PMIC.
 
+config REGULATOR_PCA9450
+    tristate "NXP PCA9450 Power Regulator"
+    depends on MFD_PCA9450
+    help
+      This driver supports PCA9450 voltage regulator chips.
+
 config REGULATOR_PCF50633
 	tristate "NXP PCF50633 regulator driver"
 	depends on MFD_PCF50633
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index c70cf3ad2425..c58c41a3260c 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -88,6 +88,7 @@ obj-$(CONFIG_REGULATOR_QCOM_RPMH) += qcom-rpmh-regulator.o
 obj-$(CONFIG_REGULATOR_QCOM_SMD_RPM) += qcom_smd-regulator.o
 obj-$(CONFIG_REGULATOR_QCOM_SPMI) += qcom_spmi-regulator.o
 obj-$(CONFIG_REGULATOR_PALMAS) += palmas-regulator.o
+obj-$(CONFIG_REGULATOR_PCA9450) += pca9450-regulator.o
 obj-$(CONFIG_REGULATOR_PF1550_RPMSG) += pf1550-regulator-rpmsg.o
 obj-$(CONFIG_REGULATOR_PFUZE100) += pfuze100-regulator.o
 obj-$(CONFIG_REGULATOR_PV88060) += pv88060-regulator.o
diff --git a/drivers/regulator/pca9450-regulator.c b/drivers/regulator/pca9450-regulator.c
new file mode 100644
index 000000000000..6b9ce8f34e0e
--- /dev/null
+++ b/drivers/regulator/pca9450-regulator.c
@@ -0,0 +1,783 @@
+/*
+ * @file pca9450-regulator.c ROHM PCA9450MWV regulator driver
+ *
+ * Copyright 2019 NXP.
+ *
+ *
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under  the terms of the GNU General  Public License as published by the
+ *  Free Software Foundation;  either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/gpio.h>
+#include <linux/mfd/pca9450.h>
+#include <linux/regulator/of_regulator.h>
+
+#define PCA9450_DVS_BUCK_NUM	3 /* Buck 1/2/3 support DVS */
+#define PCA9450_DVS0_1		2
+#define PCA9450_DVS0		1
+
+struct pca9450_buck_dvs {
+	u32 voltage[PCA9450_DVS0_1];
+};
+
+/* @brief pca9450 regulator type */
+struct pca9450_pmic {
+	struct regulator_desc descs[PCA9450_REGULATOR_CNT];
+	struct pca9450 *mfd;
+	struct device *dev;
+	struct regulator_dev *rdev[PCA9450_REGULATOR_CNT];
+	struct pca9450_buck_dvs buck_dvs[PCA9450_DVS_BUCK_NUM];
+	int	reg_index;
+};
+
+/*
+ * BUCK1/2/3
+ * BUCK1RAM[1:0] BUCK1 DVS ramp rate setting
+ * 00: 25mV/1usec
+ * 01: 25mV/2usec
+ * 10: 25mV/4usec
+ * 11: 25mV/8usec
+ */
+static int pca9450_buck123_set_ramp_delay(struct regulator_dev *rdev,
+					  int ramp_delay)
+{
+	struct pca9450_pmic *pmic = rdev_get_drvdata(rdev);
+	struct pca9450 *mfd = pmic->mfd;
+	int id = rdev->desc->id;
+	unsigned int ramp_value = BUCK1_RAMP_3P125MV;
+	unsigned int buckctrl[3] = {PCA9450_BUCK1CTRL, PCA9450_BUCK2CTRL,
+				    PCA9450_BUCK3CTRL};
+
+	dev_dbg(pmic->dev, "Buck[%d] Set Ramp = %d\n", id + 1, ramp_delay);
+	switch (ramp_delay) {
+	case 1 ... 3125:
+		ramp_value = BUCK1_RAMP_3P125MV;
+		break;
+	case 3126 ... 6250:
+		ramp_value = BUCK1_RAMP_6P25MV;
+		break;
+	case 6251 ... 12500:
+		ramp_value = BUCK1_RAMP_12P5MV;
+		break;
+	case 12501 ... 25000:
+		ramp_value = BUCK1_RAMP_25MV;
+		break;
+	default:
+		ramp_value = BUCK1_RAMP_25MV;
+	}
+
+	return regmap_update_bits(mfd->regmap, buckctrl[id],
+			BUCK1_RAMP_MASK, ramp_value << 6);
+}
+
+static struct regulator_ops pca9450_ldo_regulator_ops = {
+	.enable = regulator_enable_regmap,
+	.disable = regulator_disable_regmap,
+	.is_enabled = regulator_is_enabled_regmap,
+	.list_voltage = regulator_list_voltage_linear_range,
+	.set_voltage_sel = regulator_set_voltage_sel_regmap,
+	.get_voltage_sel = regulator_get_voltage_sel_regmap,
+};
+
+static struct regulator_ops pca9450_fixed_regulator_ops = {
+	.enable = regulator_enable_regmap,
+	.disable = regulator_disable_regmap,
+	.is_enabled = regulator_is_enabled_regmap,
+	.list_voltage = regulator_list_voltage_linear,
+};
+
+static struct regulator_ops pca9450_buck_regulator_ops = {
+	.is_enabled = regulator_is_enabled_regmap,
+	.list_voltage = regulator_list_voltage_linear_range,
+	.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 struct regulator_ops pca9450_buck123_regulator_ops = {
+	.is_enabled = regulator_is_enabled_regmap,
+	.list_voltage = regulator_list_voltage_linear_range,
+	.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,
+	.set_ramp_delay = pca9450_buck123_set_ramp_delay,
+};
+
+/*
+ * BUCK1/2/3
+ * 0.60 to 2.1875V (12.5mV step)
+ */
+static const struct regulator_linear_range pca9450_buck123_voltage_ranges[] = {
+	REGULATOR_LINEAR_RANGE(600000,  0x00, 0x7F, 12500),
+};
+
+/*
+ * BUCK4/5/6
+ * 0.6V to 3.4V (25mV step)
+ */
+static const struct regulator_linear_range pca9450_buck456_voltage_ranges[] = {
+	REGULATOR_LINEAR_RANGE(600000, 0x00, 0x70, 25000),
+	REGULATOR_LINEAR_RANGE(3400000, 0x71, 0x7F, 0),
+};
+
+/*
+ * LDO1
+ * 1.6 to 3.3V ()
+ */
+static const struct regulator_linear_range pca9450_ldo1_voltage_ranges[] = {
+	REGULATOR_LINEAR_RANGE(1600000, 0x00, 0x03, 100000),
+	REGULATOR_LINEAR_RANGE(3000000, 0x04, 0x07, 100000),
+};
+
+/*
+ * LDO2
+ * 0.8 to 1.15V (50mV step)
+ */
+static const struct regulator_linear_range pca9450_ldo2_voltage_ranges[] = {
+	REGULATOR_LINEAR_RANGE(800000, 0x00, 0x07, 50000),
+};
+
+/*
+ * LDO3
+ * 0.8 to 3.3V (100mV step)
+ */
+static const struct regulator_linear_range pca9450_ldo34_voltage_ranges[] = {
+	REGULATOR_LINEAR_RANGE(800000, 0x00, 0x19, 100000),
+	REGULATOR_LINEAR_RANGE(3300000, 0x1A, 0x1F, 0),
+};
+
+/*
+ * LDO5
+ * 1.8 to 3.3V (100mV step)
+ */
+static const struct regulator_linear_range pca9450_ldo5_voltage_ranges[] = {
+	REGULATOR_LINEAR_RANGE(1800000,  0x00, 0x0F, 100000),
+};
+
+static const struct regulator_desc pca9450_regulators[] = {
+	{
+		.name = "BUCK1",
+		.id = PCA9450_BUCK1,
+		.ops = &pca9450_buck123_regulator_ops,
+		.type = REGULATOR_VOLTAGE,
+		.n_voltages = PCA9450_BUCK1_VOLTAGE_NUM,
+		.linear_ranges = pca9450_buck123_voltage_ranges,
+		.n_linear_ranges = ARRAY_SIZE(pca9450_buck123_voltage_ranges),
+		.vsel_reg = PCA9450_BUCK1OUT_DVS0,
+		.vsel_mask = BUCK1OUT_DVS0_MASK,
+		.enable_reg = PCA9450_BUCK1CTRL,
+		.enable_mask = BUCK1_ENMODE_MASK,
+		.owner = THIS_MODULE,
+	},
+	{
+		.name = "BUCK2",
+		.id = PCA9450_BUCK2,
+		.ops = &pca9450_buck123_regulator_ops,
+		.type = REGULATOR_VOLTAGE,
+		.n_voltages = PCA9450_BUCK2_VOLTAGE_NUM,
+		.linear_ranges = pca9450_buck123_voltage_ranges,
+		.n_linear_ranges = ARRAY_SIZE(pca9450_buck123_voltage_ranges),
+		.vsel_reg = PCA9450_BUCK2OUT_DVS0,
+		.vsel_mask = BUCK2OUT_DVS0_MASK,
+		.enable_reg = PCA9450_BUCK2CTRL,
+		.enable_mask = BUCK2_ENMODE_MASK,
+		.owner = THIS_MODULE,
+	},
+	{
+		.name = "BUCK3",
+		.id = PCA9450_BUCK3,
+		.ops = &pca9450_buck123_regulator_ops,
+		.type = REGULATOR_VOLTAGE,
+		.n_voltages = PCA9450_BUCK3_VOLTAGE_NUM,
+		.linear_ranges = pca9450_buck123_voltage_ranges,
+		.n_linear_ranges = ARRAY_SIZE(pca9450_buck123_voltage_ranges),
+		.vsel_reg = PCA9450_BUCK3OUT_DVS0,
+		.vsel_mask = BUCK3OUT_DVS0_MASK,
+		.enable_reg = PCA9450_BUCK3CTRL,
+		.enable_mask = BUCK3_ENMODE_MASK,
+		.owner = THIS_MODULE,
+	},
+	{
+		.name = "BUCK4",
+		.id = PCA9450_BUCK4,
+		.ops = &pca9450_buck_regulator_ops,
+		.type = REGULATOR_VOLTAGE,
+		.n_voltages = PCA9450_BUCK4_VOLTAGE_NUM,
+		.linear_ranges = pca9450_buck456_voltage_ranges,
+		.n_linear_ranges = ARRAY_SIZE(pca9450_buck456_voltage_ranges),
+		.vsel_reg = PCA9450_BUCK4OUT,
+		.vsel_mask = BUCK4OUT_MASK,
+		.enable_reg = PCA9450_BUCK4CTRL,
+		.enable_mask = BUCK4_ENMODE_MASK,
+		.owner = THIS_MODULE,
+	},
+	{
+		.name = "BUCK5",
+		.id = PCA9450_BUCK5,
+		.ops = &pca9450_buck_regulator_ops,
+		.type = REGULATOR_VOLTAGE,
+		.n_voltages = PCA9450_BUCK5_VOLTAGE_NUM,
+		.linear_ranges = pca9450_buck456_voltage_ranges,
+		.n_linear_ranges = ARRAY_SIZE(pca9450_buck456_voltage_ranges),
+		.vsel_reg = PCA9450_BUCK5OUT,
+		.vsel_mask = BUCK5OUT_MASK,
+		.enable_reg = PCA9450_BUCK5CTRL,
+		.enable_mask = BUCK5_ENMODE_MASK,
+		.owner = THIS_MODULE,
+	},
+	{
+		.name = "BUCK6",
+		.id = PCA9450_BUCK6,
+		.ops = &pca9450_buck_regulator_ops,
+		.type = REGULATOR_VOLTAGE,
+		.n_voltages = PCA9450_BUCK6_VOLTAGE_NUM,
+		.linear_ranges = pca9450_buck456_voltage_ranges,
+		.n_linear_ranges = ARRAY_SIZE(pca9450_buck456_voltage_ranges),
+		.vsel_reg = PCA9450_BUCK6OUT,
+		.vsel_mask = BUCK6OUT_MASK,
+		.enable_reg = PCA9450_BUCK6CTRL,
+		.enable_mask = BUCK6_ENMODE_MASK,
+		.owner = THIS_MODULE,
+	},
+	{
+		.name = "LDO1",
+		.id = PCA9450_LDO1,
+		.ops = &pca9450_ldo_regulator_ops,
+		.type = REGULATOR_VOLTAGE,
+		.n_voltages = PCA9450_LDO1_VOLTAGE_NUM,
+		.linear_ranges = pca9450_ldo1_voltage_ranges,
+		.n_linear_ranges = ARRAY_SIZE(pca9450_ldo1_voltage_ranges),
+		.vsel_reg = PCA9450_LDO1CTRL,
+		.vsel_mask = LDO1OUT_MASK,
+		.enable_reg = PCA9450_LDO1CTRL,
+		.enable_mask = LDO1_EN_MASK,
+		.owner = THIS_MODULE,
+	},
+	/*
+	 * LDO2 0.9V
+	 * Fixed voltage
+	 */
+	{
+		.name = "LDO2",
+		.id = PCA9450_LDO2,
+		.ops = &pca9450_fixed_regulator_ops,
+		.type = REGULATOR_VOLTAGE,
+		.n_voltages = PCA9450_LDO2_VOLTAGE_NUM,
+		.min_uV = 900000,
+		.enable_reg = PCA9450_LDO2CTRL,
+		.enable_mask = LDO2_EN_MASK,
+		.owner = THIS_MODULE,
+	},
+	{
+		.name = "LDO3",
+		.id = PCA9450_LDO3,
+		.ops = &pca9450_ldo_regulator_ops,
+		.type = REGULATOR_VOLTAGE,
+		.n_voltages = PCA9450_LDO3_VOLTAGE_NUM,
+		.linear_ranges = pca9450_ldo34_voltage_ranges,
+		.n_linear_ranges = ARRAY_SIZE(pca9450_ldo34_voltage_ranges),
+		.vsel_reg = PCA9450_LDO3CTRL,
+		.vsel_mask = LDO3OUT_MASK,
+		.enable_reg = PCA9450_LDO3CTRL,
+		.enable_mask = LDO3_EN_MASK,
+		.owner = THIS_MODULE,
+	},
+	{
+		.name = "LDO4",
+		.id = PCA9450_LDO4,
+		.ops = &pca9450_ldo_regulator_ops,
+		.type = REGULATOR_VOLTAGE,
+		.n_voltages = PCA9450_LDO4_VOLTAGE_NUM,
+		.linear_ranges = pca9450_ldo34_voltage_ranges,
+		.n_linear_ranges = ARRAY_SIZE(pca9450_ldo34_voltage_ranges),
+		.vsel_reg = PCA9450_LDO4CTRL,
+		.vsel_mask = LDO4OUT_MASK,
+		.enable_reg = PCA9450_LDO4CTRL,
+		.enable_mask = LDO4_EN_MASK,
+		.owner = THIS_MODULE,
+	},
+	{
+		.name = "LDO5",
+		.id = PCA9450_LDO5,
+		.ops = &pca9450_ldo_regulator_ops,
+		.type = REGULATOR_VOLTAGE,
+		.n_voltages = PCA9450_LDO5_VOLTAGE_NUM,
+		.linear_ranges = pca9450_ldo5_voltage_ranges,
+		.n_linear_ranges = ARRAY_SIZE(pca9450_ldo5_voltage_ranges),
+		.vsel_reg = PCA9450_LDO5CTRL_H,
+		.vsel_mask = LDO5HOUT_MASK,
+		.enable_reg = PCA9450_LDO5CTRL_H,
+		.enable_mask = LDO5H_EN_MASK,
+		.owner = THIS_MODULE,
+	},
+};
+
+#ifdef CONFIG_OF
+
+static struct of_regulator_match pca9450_matches[] = {
+	{ .name = "buck1",	},
+	{ .name = "buck2",	},
+	{ .name = "buck3",	},
+	{ .name = "buck4",	},
+	{ .name = "buck5",	},
+	{ .name = "buck6",	},
+	{ .name = "ldo1",	},
+	{ .name = "ldo2",	},
+	{ .name = "ldo3",	},
+	{ .name = "ldo4",	},
+	{ .name = "ldo5",	},
+};
+
+/*
+ * @brief parse pca9450 regulator device tree
+ * @param pdev platform device of pca9450 regulator
+ * @param pca9450_reg_matches return regualtor matches
+ * @retval 0 parse success
+ * @retval NULL parse fail
+ */
+static int pca9450_parse_dt_reg_data(
+		struct platform_device *pdev,
+		struct of_regulator_match **reg_matches)
+{
+	struct device_node *np, *regulators;
+	struct of_regulator_match *matches;
+	int ret, count;
+
+	np = of_node_get(pdev->dev.parent->of_node);
+	regulators = of_find_node_by_name(np, "regulators");
+	if (!regulators) {
+		dev_err(&pdev->dev, "regulator node not found\n");
+		return -EINVAL;
+	}
+
+	count = ARRAY_SIZE(pca9450_matches);
+	matches = pca9450_matches;
+
+	ret = of_regulator_match(&pdev->dev, regulators, matches, count);
+	of_node_put(regulators);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Error parsing regulator init data: %d\n",
+			ret);
+		return ret;
+	}
+
+	*reg_matches = matches;
+
+	return 0;
+}
+#else
+static inline int pca9450_parse_dt_reg_data(
+			struct platform_device *pdev,
+			struct of_regulator_match **reg_matches)
+{
+	*reg_matches = NULL;
+	return 0;
+}
+#endif
+
+/* @brief directly set raw value to chip register, format: 'register value' */
+static ssize_t pca9450_sysfs_set_registers(struct device *dev,
+					   struct device_attribute *attr,
+					   const char *buf,
+					   size_t count)
+{
+	struct pca9450_pmic *pmic = dev_get_drvdata(dev);
+	ssize_t ret = 0;
+	unsigned int reg;
+	unsigned int val;
+
+	ret = sscanf(buf, "%x %x", &reg, &val);
+	if (ret < 1) {
+		pmic->reg_index = -1;
+		dev_err(pmic->dev, "registers set: <reg> <value>\n");
+		return count;
+	}
+
+	if (ret == 1 && reg < PCA9450_MAX_REGISTER) {
+		pmic->reg_index = reg;
+		dev_info(pmic->dev, "registers set: reg=0x%x\n", reg);
+		return count;
+	}
+
+	if (reg >= PCA9450_MAX_REGISTER) {
+		dev_err(pmic->dev, "reg=%d out of Max=%d\n", reg,
+			PCA9450_MAX_REGISTER);
+		return -EINVAL;
+	}
+	dev_info(pmic->dev, "registers set: reg=0x%x, val=0x%x\n", reg, val);
+	ret = pca9450_reg_write(pmic->mfd, reg, val);
+	if (ret < 0)
+		return ret;
+	return count;
+}
+
+/* @brief print value of chip register, format: 'register=value' */
+static ssize_t pca9450_sysfs_print_reg(struct pca9450_pmic *pmic,
+				       u8 reg,
+				       char *buf)
+{
+	int ret = pca9450_reg_read(pmic->mfd, reg);
+
+	if (ret < 0)
+		return sprintf(buf, "%#.2x=error %d\n", reg, ret);
+	return sprintf(buf, "[0x%.2X] = %.2X\n", reg, ret);
+}
+
+/*
+ * @brief show all raw values of chip register, format per line:
+ * 'register=value'
+ */
+static ssize_t pca9450_sysfs_show_registers(struct device *dev,
+					    struct device_attribute *attr,
+					    char *buf)
+{
+	struct pca9450_pmic *pmic = dev_get_drvdata(dev);
+	ssize_t ret = 0;
+	int i;
+
+	dev_info(pmic->dev, "register: index[0x%x]\n", pmic->reg_index);
+	if (pmic->reg_index >= 0)
+		ret += pca9450_sysfs_print_reg(pmic, pmic->reg_index,
+					       buf + ret);
+	else
+		for (i = 0; i < PCA9450_MAX_REGISTER; i++)
+			ret += pca9450_sysfs_print_reg(pmic, i, buf + ret);
+
+	return ret;
+}
+
+static DEVICE_ATTR(registers, 0644,
+		pca9450_sysfs_show_registers, pca9450_sysfs_set_registers);
+
+/* @brief device sysfs attribute table, about o */
+static struct attribute *clk_attributes[] = {
+	&dev_attr_registers.attr,
+	NULL
+};
+
+static const struct attribute_group clk_attr_group = {
+	.attrs	= clk_attributes,
+};
+
+/*----------------------------------------------------------------------*/
+#ifdef CONFIG_OF
+/*
+ * @brief buck1/2 dvs enable/voltage from device tree
+ * @param pdev platform device pointer
+ * @param buck_dvs pointer
+ * @return void
+ */
+static void of_pca9450_buck_dvs(struct platform_device *pdev,
+				struct pca9450_buck_dvs *buck_dvs)
+{
+	struct device_node *pmic_np;
+
+	pmic_np = of_node_get(pdev->dev.parent->of_node);
+	if (!pmic_np) {
+		dev_err(&pdev->dev, "could not find pmic sub-node\n");
+		return;
+	}
+	if (of_get_property(pmic_np, "pca9450,pmic-buck1-uses-i2c-dvs", NULL)) {
+		if (of_property_read_u32_array(pmic_np,
+					       "pca9450,pmic-buck1-dvs-voltage",
+					       &buck_dvs[0].voltage[0],
+					       PCA9450_DVS0_1)) {
+			dev_err(&pdev->dev, "buck1 voltages not specified\n");
+		}
+	}
+
+	if (of_get_property(pmic_np, "pca9450,pmic-buck2-uses-i2c-dvs", NULL)) {
+		if (of_property_read_u32_array(pmic_np,
+					       "pca9450,pmic-buck2-dvs-voltage",
+						&buck_dvs[1].voltage[0],
+						PCA9450_DVS0_1)) {
+			dev_err(&pdev->dev, "buck2 voltages not specified\n");
+		}
+	}
+
+	if (of_get_property(pmic_np, "pca9450,pmic-buck3-uses-i2c-dvs", NULL)) {
+		if (of_property_read_u32_array(pmic_np,
+					       "pca9450,pmic-buck3-dvs-voltage",
+					       &buck_dvs[2].voltage[0],
+					       PCA9450_DVS0)) {
+			dev_err(&pdev->dev, "buck3 voltages not specified\n");
+		}
+	}
+}
+#else
+static void of_pca9450_buck_dvs(struct platform_device *pdev,
+				struct pca9450_buck_dvs *buck_dvs)
+{
+	buck_dvs[0].voltage[0] = BUCK1OUT_DVS0_DEFAULT;
+	buck_dvs[0].voltage[1] = BUCK1OUT_DVS1_DEFAULT;
+	buck_dvs[1].voltage[0] = BUCK2OUT_DVS0_DEFAULT;
+	buck_dvs[1].voltage[1] = BUCK2OUT_DVS1_DEFAULT;
+	buck_dvs[2].voltage[0] = BUCK3OUT_DVS0_DEFAULT;
+	buck_dvs[2].voltage[1] = 0; /* Not supported */
+}
+#endif
+
+static int pca9450_buck123_dvs_init(struct pca9450_pmic *pmic)
+{
+	struct pca9450 *pca9450 = pmic->mfd;
+	struct pca9450_buck_dvs *buck_dvs = &pmic->buck_dvs[0];
+	int i, ret, val, selector = 0;
+	u8 reg_dvs0, reg_dvs1;
+	u8 reg_dvs0_msk, reg_dvs1_msk;
+
+	for (i = 0; i < PCA9450_DVS_BUCK_NUM; i++, buck_dvs++) {
+		switch (i) {
+		case 0:
+		default:
+			reg_dvs0 = PCA9450_BUCK1OUT_DVS0;
+			reg_dvs0_msk = BUCK1OUT_DVS0_MASK;
+			reg_dvs1 = PCA9450_BUCK1OUT_DVS1;
+			reg_dvs1_msk = BUCK1OUT_DVS1_MASK;
+			break;
+		case 1:
+			reg_dvs0 = PCA9450_BUCK2OUT_DVS0;
+			reg_dvs0_msk = BUCK2OUT_DVS0_MASK;
+			reg_dvs1 = PCA9450_BUCK2OUT_DVS1;
+			reg_dvs1_msk = BUCK2OUT_DVS1_MASK;
+			break;
+		case 2:
+			reg_dvs0 = PCA9450_BUCK3OUT_DVS0;
+			reg_dvs0_msk = BUCK3OUT_DVS0_MASK;
+			reg_dvs1 = PCA9450_BUCK3OUT_DVS1;
+			reg_dvs1_msk = BUCK3OUT_DVS1_MASK;
+			break;
+		}
+
+		dev_dbg(pmic->dev, "Buck%d: DVS0-DVS1[%d - %d].\n", i+1,
+			buck_dvs->voltage[0], buck_dvs->voltage[1]);
+		if (reg_dvs0 > 0) {
+			selector = regulator_map_voltage_iterate(pmic->rdev[i],
+								 buck_dvs->voltage[0],
+								 buck_dvs->voltage[0]);
+			if (selector < 0) {
+				dev_dbg(pmic->dev,
+					"not found selector for DVS0 [%d]\n",
+					buck_dvs->voltage[0]);
+			} else {
+				val = (selector & reg_dvs0_msk);
+				ret = pca9450_reg_write(pca9450, reg_dvs0, val);
+				if (ret < 0)
+					return ret;
+			}
+		}
+		if (reg_dvs1 > 0) {
+			selector = regulator_map_voltage_iterate(pmic->rdev[i],
+								 buck_dvs->voltage[1],
+								 buck_dvs->voltage[1]);
+			if (selector < 0) {
+				dev_dbg(pmic->dev,
+					"not found selector for DVS1 [%d]\n",
+					buck_dvs->voltage[1]);
+			} else {
+				val = (selector & reg_dvs1_msk);
+				ret = pca9450_reg_write(pca9450, reg_dvs1, val);
+				if (ret < 0)
+					return ret;
+			}
+		}
+	}
+	return 0;
+}
+
+/*
+ * @brief pca9450 pmic interrupt
+ * @param irq system irq
+ * @param pwrsys pca9450 power device of system
+ * @retval IRQ_HANDLED success
+ * @retval IRQ_NONE error
+ */
+static irqreturn_t pca9450_pmic_interrupt(int irq, void *pwrsys)
+{
+	struct device *dev = pwrsys;
+	struct pca9450 *mfd = dev_get_drvdata(dev->parent);
+	int reg;
+
+	reg = pca9450_reg_read(mfd, PCA9450_INT1);
+	if (reg < 0)
+		return IRQ_NONE;
+
+	if (reg & IRQ_PWRON)
+		dev_dbg(dev, "IRQ_PWRON\n");
+	if (reg & IRQ_WDOGB)
+		dev_dbg(dev, "IRQ_WDOGB\n");
+	if (reg & IRQ_VR_FLT1)
+		dev_dbg(dev, "IRQ_VR_FLT1\n");
+	if (reg & IRQ_VR_FLT2)
+		dev_dbg(dev, "IRQ_VR_FLT2\n");
+	if (reg & IRQ_LOWVSYS)
+		dev_dbg(dev, "IRQ_LOWVSYS\n");
+	if (reg & IRQ_THERM_105)
+		dev_dbg(dev, "IRQ_THERM_105\n");
+	if (reg & IRQ_THERM_125)
+		dev_dbg(dev, "IRQ_THERM_125\n");
+
+	return IRQ_HANDLED;
+}
+
+/*
+ * @brief probe pca9450 regulator device
+ * @param pdev pca9450 regulator platform device
+ * @retval 0 success
+ * @retval negative fail
+ */
+static int pca9450_probe(struct platform_device *pdev)
+{
+	struct pca9450_pmic *pmic;
+	struct pca9450_board *pdata;
+	struct regulator_config config = {};
+	struct pca9450 *pca9450 = dev_get_drvdata(pdev->dev.parent);
+	struct of_regulator_match *matches = NULL;
+	int i = 0, err, irq = 0, ret = 0;
+
+	pmic = kzalloc(sizeof(*pmic), GFP_KERNEL);
+	if (!pmic)
+		return -ENOMEM;
+
+	memcpy(pmic->descs, pca9450_regulators,	sizeof(pmic->descs));
+
+	pmic->dev = &pdev->dev;
+	pmic->mfd = pca9450;
+	platform_set_drvdata(pdev, pmic);
+	pdata = dev_get_platdata(pca9450->dev);
+
+	if (!pdata && pca9450->dev->of_node) {
+		pca9450_parse_dt_reg_data(pdev,	&matches);
+		if (matches == NULL) {
+			dev_err(&pdev->dev, "Platform data not found\n");
+			return -EINVAL;
+		}
+	}
+
+	/* Get buck dvs parameters */
+	of_pca9450_buck_dvs(pdev, &pmic->buck_dvs[0]);
+
+	for (i = 0; i < PCA9450_REGULATOR_CNT; i++) {
+		struct regulator_init_data *init_data;
+		struct regulator_desc *desc;
+		struct regulator_dev *rdev;
+
+		desc = &pmic->descs[i];
+		desc->name = pca9450_matches[i].name;
+
+		if (pdata)
+			init_data = pdata->init_data[i];
+		else
+			init_data = pca9450_matches[i].init_data;
+
+		config.dev = pmic->dev;
+		config.init_data = init_data;
+		config.driver_data = pmic;
+		config.regmap = pca9450->regmap;
+		if (matches)
+			config.of_node = matches[i].of_node;
+		dev_dbg(config.dev, "regulator register name '%s'\n",
+			desc->name);
+
+		rdev = regulator_register(desc, &config);
+		if (IS_ERR(rdev)) {
+			dev_err(pca9450->dev,
+				"failed to register %s regulator\n",
+				desc->name);
+			err = PTR_ERR(rdev);
+			goto err;
+		}
+		pmic->rdev[i] = rdev;
+	}
+
+	/* Init sysfs registers */
+	pmic->reg_index = -1;
+
+	err = sysfs_create_group(&pdev->dev.kobj, &clk_attr_group);
+	if (err != 0) {
+		dev_err(&pdev->dev, "Failed to create sysfs: %d\n", err);
+		goto err;
+	}
+
+	/* Init Buck1/2/3 dvs */
+	err = pca9450_buck123_dvs_init(pmic);
+	if (err != 0) {
+		dev_err(&pdev->dev, "Failed to buck123 dvs: %d\n", err);
+		goto err;
+	}
+
+	/* Add Interrupt */
+	irq  = platform_get_irq(pdev, 0);
+	if (irq <= 0) {
+		dev_warn(&pdev->dev, "platform irq error # %d\n", irq);
+		return -ENXIO;
+	}
+	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
+					pca9450_pmic_interrupt,
+					IRQF_TRIGGER_LOW | IRQF_EARLY_RESUME,
+					dev_name(&pdev->dev), &pdev->dev);
+	if (ret < 0)
+		dev_err(&pdev->dev, "IRQ %d is not free.\n", irq);
+
+	/* Un-mask IRQ Interrupt */
+	ret = pca9450_reg_write(pca9450, PCA9450_INT1_MSK, 0);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Write 'PCA9450_REG_MIRQ': failed!\n");
+		ret = -EIO;
+		goto err;
+	}
+
+	return 0;
+
+err:
+	while (--i >= 0)
+		regulator_unregister(pmic->rdev[i]);
+
+	kfree(pmic);
+	return err;
+}
+
+/*
+ * @brief remove pca9450 regulator device
+ * @param pdev pca9450 regulator platform device
+ * @return 0
+ */
+static int __exit pca9450_remove(struct platform_device *pdev)
+{
+	struct pca9450_pmic *pmic = platform_get_drvdata(pdev);
+	int i;
+
+	sysfs_remove_group(&pdev->dev.kobj, &clk_attr_group);
+
+	for (i = 0; i < PCA9450_REGULATOR_CNT; i++)
+		regulator_unregister(pmic->rdev[i]);
+
+	kfree(pmic);
+	return 0;
+}
+
+static struct platform_driver pca9450_driver = {
+	.driver = {
+		.name = "pca9450-pmic",
+		.owner = THIS_MODULE,
+	},
+	.probe = pca9450_probe,
+	.remove = pca9450_remove,
+};
+module_platform_driver(pca9450_driver);
+
+MODULE_DESCRIPTION("PCA9450 voltage regulator driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:pca9450-pmic");