diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index aae28d0..fd9a29c 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -1082,6 +1082,16 @@ config REGULATOR_RT4801
 	  This adds support for voltage regulators in Richtek RT4801 Display Bias IC.
 	  The device supports two regulators (DSVP/DSVN).
 
+config REGULATOR_RT4803
+	tristate "Richtek RT4803 boost regualtor"
+	depends on I2C
+	select REGMAP_I2C
+	help
+	  This adds support for RT4803 boost converter that integrates the
+	  bypass switch. If the input voltage is low than the required voltage,
+	  RT4803 will enter boost mode. Otherwise, enable internal bypass
+	  switch to enter bypass mode.
+
 config REGULATOR_RT4831
 	tristate "Richtek RT4831 DSV Regulators"
 	depends on MFD_RT4831
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index ee383d8..163b599 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -130,6 +130,7 @@ obj-$(CONFIG_REGULATOR_RK808)   += rk808-regulator.o
 obj-$(CONFIG_REGULATOR_RN5T618) += rn5t618-regulator.o
 obj-$(CONFIG_REGULATOR_ROHM)	+= rohm-regulator.o
 obj-$(CONFIG_REGULATOR_RT4801)	+= rt4801-regulator.o
+obj-$(CONFIG_REGULATOR_RT4803)	+= rt4803.o
 obj-$(CONFIG_REGULATOR_RT4831)	+= rt4831-regulator.o
 obj-$(CONFIG_REGULATOR_RT5033)	+= rt5033-regulator.o
 obj-$(CONFIG_REGULATOR_RT5120)	+= rt5120-regulator.o
diff --git a/drivers/regulator/rt4803.c b/drivers/regulator/rt4803.c
new file mode 100644
index 00000000..c96fb02
--- /dev/null
+++ b/drivers/regulator/rt4803.c
@@ -0,0 +1,216 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2023 Richtek Technology Corp.
+ *
+ * Author: ChiYuan Huang <cy_huang@richtek.com>
+ */
+
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/of_regulator.h>
+
+#define RT4803_AUTO_MODE	1
+#define RT4803_FPWM_MODE	2
+
+#define RT4803_REG_CONFIG	0x01
+#define RT4803_REG_VSELL	0x02
+#define RT4803_REG_VSELH	0x03
+#define RT4803_REG_ILIM		0x04
+#define RT4803_REG_STAT		0x05
+
+#define RT4803_MODE_MASK	GENMASK(1, 0)
+#define RT4803_VSEL_MASK	GENMASK(4, 0)
+#define RT4803_ILIM_MASK	GENMASK(3, 0)
+#define RT4803_TSD_MASK		BIT(7)
+#define RT4803_HOTDIE_MASK	BIT(6)
+#define RT4803_FAULT_MASK	BIT(1)
+#define RT4803_PGOOD_MASK	BIT(0)
+
+#define RT4803_VOUT_MINUV	2850000
+#define RT4803_VOUT_STEPUV	50000
+#define RT4803_VOUT_NUM		32
+
+static int rt4803_set_mode(struct regulator_dev *rdev, unsigned int mode)
+{
+	struct regmap *regmap = rdev_get_regmap(rdev);
+	unsigned int modeval;
+
+	switch (mode) {
+	case REGULATOR_MODE_NORMAL:
+		modeval = RT4803_AUTO_MODE;
+		break;
+	case REGULATOR_MODE_FAST:
+		modeval = RT4803_FPWM_MODE;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	modeval <<= ffs(RT4803_MODE_MASK) - 1;
+
+	return regmap_update_bits(regmap, RT4803_REG_CONFIG, RT4803_MODE_MASK, modeval);
+}
+
+static unsigned int rt4803_get_mode(struct regulator_dev *rdev)
+{
+	struct regmap *regmap = rdev_get_regmap(rdev);
+	unsigned int modeval;
+	int ret;
+
+	ret = regmap_read(regmap, RT4803_REG_CONFIG, &modeval);
+	if (ret)
+		return REGULATOR_MODE_INVALID;
+
+	modeval >>= ffs(RT4803_MODE_MASK) - 1;
+
+	switch (modeval) {
+	case RT4803_AUTO_MODE:
+		return REGULATOR_MODE_NORMAL;
+	case RT4803_FPWM_MODE:
+		return REGULATOR_MODE_FAST;
+	default:
+		return REGULATOR_MODE_INVALID;
+	}
+}
+
+static int rt4803_get_error_flags(struct regulator_dev *rdev, unsigned int *flags)
+{
+	struct regmap *regmap = rdev_get_regmap(rdev);
+	unsigned int state, events = 0;
+	int ret;
+
+	ret = regmap_read(regmap, RT4803_REG_STAT, &state);
+	if (ret)
+		return ret;
+
+	if (state & RT4803_PGOOD_MASK)
+		goto out_error_flag;
+
+	if (state & RT4803_FAULT_MASK)
+		events |= REGULATOR_ERROR_FAIL;
+
+	if (state & RT4803_HOTDIE_MASK)
+		events |= REGULATOR_ERROR_OVER_TEMP_WARN;
+
+	if (state & RT4803_TSD_MASK)
+		events |= REGULATOR_ERROR_OVER_TEMP;
+
+out_error_flag:
+	*flags = events;
+	return 0;
+}
+
+static int rt4803_set_suspend_voltage(struct regulator_dev *rdev, int uV)
+{
+	struct regmap *regmap = rdev_get_regmap(rdev);
+	unsigned int reg, vsel;
+
+	if (rdev->desc->vsel_reg == RT4803_REG_VSELL)
+		reg = RT4803_REG_VSELH;
+	else
+		reg = RT4803_REG_VSELL;
+
+	vsel = (uV - rdev->desc->min_uV) / rdev->desc->uV_step;
+	vsel <<= ffs(RT4803_VSEL_MASK) - 1;
+
+	return regmap_update_bits(regmap, reg, RT4803_VSEL_MASK, vsel);
+}
+
+static const struct regulator_ops rt4803_regulator_ops = {
+	.list_voltage = regulator_list_voltage_linear,
+	.set_voltage_sel = regulator_set_voltage_sel_regmap,
+	.get_voltage_sel = regulator_get_voltage_sel_regmap,
+	.set_mode = rt4803_set_mode,
+	.get_mode = rt4803_get_mode,
+	.get_error_flags = rt4803_get_error_flags,
+	.set_suspend_voltage = rt4803_set_suspend_voltage,
+};
+
+static unsigned int rt4803_of_map_mode(unsigned int mode)
+{
+	switch (mode) {
+	case RT4803_AUTO_MODE:
+		return REGULATOR_MODE_NORMAL;
+	case RT4803_FPWM_MODE:
+		return REGULATOR_MODE_FAST;
+	default:
+		return REGULATOR_MODE_INVALID;
+	}
+}
+
+static const struct regmap_config rt4803_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = RT4803_REG_STAT,
+};
+
+static int rt4803_probe(struct i2c_client *i2c)
+{
+	struct device *dev = &i2c->dev;
+	struct regmap *regmap;
+	struct regulator_desc *desc;
+	struct regulator_config cfg = {};
+	struct regulator_dev *rdev;
+	bool vsel_act_high;
+	int ret;
+
+	desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
+	if (!desc)
+		return -ENOMEM;
+
+	regmap = devm_regmap_init_i2c(i2c, &rt4803_regmap_config);
+	if (IS_ERR(regmap))
+		return dev_err_probe(dev, PTR_ERR(regmap), "Failed to init regmap\n");
+
+	/* Always configure the input current limit to max 5A at initial */
+	ret = regmap_update_bits(regmap, RT4803_REG_ILIM, RT4803_ILIM_MASK, 0xff);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to config ILIM to max\n");
+
+	vsel_act_high = device_property_read_bool(dev, "richtek,vsel-active-high");
+
+	desc->name = "rt4803-regulator";
+	desc->type = REGULATOR_VOLTAGE;
+	desc->owner = THIS_MODULE;
+	desc->ops = &rt4803_regulator_ops;
+	desc->min_uV = RT4803_VOUT_MINUV;
+	desc->uV_step = RT4803_VOUT_STEPUV;
+	desc->n_voltages = RT4803_VOUT_NUM;
+	desc->vsel_mask = RT4803_VSEL_MASK;
+	desc->of_map_mode = rt4803_of_map_mode;
+	if (vsel_act_high)
+		desc->vsel_reg = RT4803_REG_VSELH;
+	else
+		desc->vsel_reg = RT4803_REG_VSELL;
+
+	cfg.dev = dev;
+	cfg.of_node = dev_of_node(dev);
+	cfg.init_data = of_get_regulator_init_data(dev, dev_of_node(dev), desc);
+
+	rdev = devm_regulator_register(dev, desc, &cfg);
+	return PTR_ERR_OR_ZERO(rdev);
+}
+
+static const struct of_device_id rt4803_device_match_table[] = {
+	{ .compatible = "richtek,rt4803" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, rt4803_device_match_table);
+
+static struct i2c_driver rt4803_driver = {
+	.driver = {
+		.name = "rt4803",
+		.of_match_table = rt4803_device_match_table,
+	},
+	.probe = rt4803_probe,
+};
+module_i2c_driver(rt4803_driver);
+
+MODULE_DESCRIPTION("Richtek RT4803 voltage regulator driver");
+MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
+MODULE_LICENSE("GPL");
