power: regulator: stpmu1: Introduce stpmu1 driver

Enable support for the regulator functions of the STPMU1X PMIC. The
driver implements get/set api for the various BUCKS and LDOs supported
by the PMIC device. This driver is controlled by a device tree node
which includes voltage limits.

Signed-off-by: Christophe Kerello <christophe.kerello@st.com>
Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>

3 files changed, 677 insertions, 0 deletions

diff --git a/drivers/power/regulator/Kconfig b/drivers/power/regulator/Kconfig
index 5b4ac10..822cff6 100644
--- a/drivers/power/regulator/Kconfig
+++ b/drivers/power/regulator/Kconfig
@@ -204,3 +204,12 @@ config DM_REGULATOR_TPS65910
 	The TPS65910 PMIC provides 4 SMPSs and 8 LDOs. This driver supports all
 	regulator types of the TPS65910 (BUCK, BOOST and LDO). It implements
 	the get/set api for value and enable.
+
+config DM_REGULATOR_STPMU1
+	bool "Enable driver for STPMU1 regulators"
+	depends on DM_REGULATOR && PMIC_STPMU1
+	---help---
+	Enable support for the regulator functions of the STPMU1 PMIC. The
+	driver implements get/set api for the various BUCKS and LDOs supported
+	by the PMIC device. This driver is controlled by a device tree node
+	which includes voltage limits.
diff --git a/drivers/power/regulator/Makefile b/drivers/power/regulator/Makefile
index f7873ad..d73a6e3 100644
--- a/drivers/power/regulator/Makefile
+++ b/drivers/power/regulator/Makefile
@@ -23,3 +23,4 @@ obj-$(CONFIG_$(SPL_)DM_REGULATOR_PBIAS) += pbias_regulator.o
 obj-$(CONFIG_$(SPL_)DM_REGULATOR_LP873X) += lp873x_regulator.o
 obj-$(CONFIG_$(SPL_)DM_REGULATOR_LP87565) += lp87565_regulator.o
 obj-$(CONFIG_DM_REGULATOR_TPS65910) += tps65910_regulator.o
+obj-$(CONFIG_$(SPL_)DM_REGULATOR_STPMU1) += stpmu1.o
diff --git a/drivers/power/regulator/stpmu1.c b/drivers/power/regulator/stpmu1.c
new file mode 100644
index 0000000..2dedb80
--- /dev/null
+++ b/drivers/power/regulator/stpmu1.c
@@ -0,0 +1,667 @@
+// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
+/*
+ * Copyright (C) 2018, STMicroelectronics - All Rights Reserved
+ * Author: Christophe Kerello <christophe.kerello@st.com>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <power/pmic.h>
+#include <power/regulator.h>
+#include <power/stpmu1.h>
+
+struct stpmu1_range {
+	int min_uv;
+	int min_sel;
+	int max_sel;
+	int step;
+};
+
+struct stpmu1_output_range {
+	const struct stpmu1_range *ranges;
+	int nbranges;
+};
+
+#define STPMU1_MODE(_id, _val, _name) { \
+	.id = _id,			\
+	.register_value = _val,		\
+	.name = _name,			\
+}
+
+#define STPMU1_RANGE(_min_uv, _min_sel, _max_sel, _step) { \
+	.min_uv = _min_uv,		\
+	.min_sel = _min_sel,		\
+	.max_sel = _max_sel,		\
+	.step = _step,			\
+}
+
+#define STPMU1_OUTPUT_RANGE(_ranges, _nbranges) { \
+	.ranges = _ranges,		\
+	.nbranges = _nbranges,		\
+}
+
+static int stpmu1_output_find_uv(int sel,
+				 const struct stpmu1_output_range *output_range)
+{
+	const struct stpmu1_range *range;
+	int i;
+
+	for (i = 0, range = output_range->ranges;
+	     i < output_range->nbranges; i++, range++) {
+		if (sel >= range->min_sel && sel <= range->max_sel)
+			return range->min_uv +
+			       (sel - range->min_sel) * range->step;
+	}
+
+	return -EINVAL;
+}
+
+static int stpmu1_output_find_sel(int uv,
+				  const struct stpmu1_output_range *output_range)
+{
+	const struct stpmu1_range *range;
+	int i;
+
+	for (i = 0, range = output_range->ranges;
+	     i < output_range->nbranges; i++, range++) {
+		if (uv == range->min_uv && !range->step)
+			return range->min_sel;
+
+		if (uv >= range->min_uv &&
+		    uv <= range->min_uv +
+			  (range->max_sel - range->min_sel) * range->step)
+			return range->min_sel +
+			       (uv - range->min_uv) / range->step;
+	}
+
+	return -EINVAL;
+}
+
+/*
+ * BUCK regulators
+ */
+
+static const struct stpmu1_range buck1_ranges[] = {
+	STPMU1_RANGE(600000, 0, 30, 25000),
+	STPMU1_RANGE(1350000, 31, 63, 0),
+};
+
+static const struct stpmu1_range buck2_ranges[] = {
+	STPMU1_RANGE(1000000, 0, 17, 0),
+	STPMU1_RANGE(1050000, 18, 19, 0),
+	STPMU1_RANGE(1100000, 20, 21, 0),
+	STPMU1_RANGE(1150000, 22, 23, 0),
+	STPMU1_RANGE(1200000, 24, 25, 0),
+	STPMU1_RANGE(1250000, 26, 27, 0),
+	STPMU1_RANGE(1300000, 28, 29, 0),
+	STPMU1_RANGE(1350000, 30, 31, 0),
+	STPMU1_RANGE(1400000, 32, 33, 0),
+	STPMU1_RANGE(1450000, 34, 35, 0),
+	STPMU1_RANGE(1500000, 36, 63, 0),
+};
+
+static const struct stpmu1_range buck3_ranges[] = {
+	STPMU1_RANGE(1000000, 0, 19, 0),
+	STPMU1_RANGE(1100000, 20, 23, 0),
+	STPMU1_RANGE(1200000, 24, 27, 0),
+	STPMU1_RANGE(1300000, 28, 31, 0),
+	STPMU1_RANGE(1400000, 32, 35, 0),
+	STPMU1_RANGE(1500000, 36, 55, 100000),
+	STPMU1_RANGE(3400000, 56, 63, 0),
+};
+
+static const struct stpmu1_range buck4_ranges[] = {
+	STPMU1_RANGE(600000, 0, 27, 25000),
+	STPMU1_RANGE(1300000, 28, 29, 0),
+	STPMU1_RANGE(1350000, 30, 31, 0),
+	STPMU1_RANGE(1400000, 32, 33, 0),
+	STPMU1_RANGE(1450000, 34, 35, 0),
+	STPMU1_RANGE(1500000, 36, 60, 100000),
+	STPMU1_RANGE(3900000, 61, 63, 0),
+};
+
+/* BUCK: 1,2,3,4 - voltage ranges */
+static const struct stpmu1_output_range buck_voltage_range[] = {
+	STPMU1_OUTPUT_RANGE(buck1_ranges, ARRAY_SIZE(buck1_ranges)),
+	STPMU1_OUTPUT_RANGE(buck2_ranges, ARRAY_SIZE(buck2_ranges)),
+	STPMU1_OUTPUT_RANGE(buck3_ranges, ARRAY_SIZE(buck3_ranges)),
+	STPMU1_OUTPUT_RANGE(buck4_ranges, ARRAY_SIZE(buck4_ranges)),
+};
+
+/* BUCK modes */
+static const struct dm_regulator_mode buck_modes[] = {
+	STPMU1_MODE(STPMU1_BUCK_MODE_HP, STPMU1_BUCK_MODE_HP, "HP"),
+	STPMU1_MODE(STPMU1_BUCK_MODE_LP, STPMU1_BUCK_MODE_LP, "LP"),
+};
+
+static int stpmu1_buck_get_uv(struct udevice *dev, int buck)
+{
+	int sel;
+
+	sel = pmic_reg_read(dev, STPMU1_BUCKX_CTRL_REG(buck));
+	if (sel < 0)
+		return sel;
+
+	sel &= STPMU1_BUCK_OUTPUT_MASK;
+	sel >>= STPMU1_BUCK_OUTPUT_SHIFT;
+
+	return stpmu1_output_find_uv(sel, &buck_voltage_range[buck]);
+}
+
+static int stpmu1_buck_get_value(struct udevice *dev)
+{
+	return stpmu1_buck_get_uv(dev->parent, dev->driver_data - 1);
+}
+
+static int stpmu1_buck_set_value(struct udevice *dev, int uv)
+{
+	int sel, buck = dev->driver_data - 1;
+
+	sel = stpmu1_output_find_sel(uv, &buck_voltage_range[buck]);
+	if (sel < 0)
+		return sel;
+
+	return pmic_clrsetbits(dev->parent,
+			       STPMU1_BUCKX_CTRL_REG(buck),
+			       STPMU1_BUCK_OUTPUT_MASK,
+			       sel << STPMU1_BUCK_OUTPUT_SHIFT);
+}
+
+static int stpmu1_buck_get_enable(struct udevice *dev)
+{
+	int ret;
+
+	ret = pmic_reg_read(dev->parent,
+			    STPMU1_BUCKX_CTRL_REG(dev->driver_data - 1));
+	if (ret < 0)
+		return false;
+
+	return ret & STPMU1_BUCK_EN ? true : false;
+}
+
+static int stpmu1_buck_set_enable(struct udevice *dev, bool enable)
+{
+	struct dm_regulator_uclass_platdata *uc_pdata;
+	int ret, uv;
+
+	/* if regulator is already in the wanted state, nothing to do */
+	if (stpmu1_buck_get_enable(dev) == enable)
+		return 0;
+
+	if (enable) {
+		uc_pdata = dev_get_uclass_platdata(dev);
+		uv = stpmu1_buck_get_value(dev);
+		if ((uv < uc_pdata->min_uV) || (uv > uc_pdata->max_uV))
+			stpmu1_buck_set_value(dev, uc_pdata->min_uV);
+	}
+
+	ret = pmic_clrsetbits(dev->parent,
+			      STPMU1_BUCKX_CTRL_REG(dev->driver_data - 1),
+			      STPMU1_BUCK_EN, enable ? STPMU1_BUCK_EN : 0);
+	if (enable)
+		mdelay(STPMU1_DEFAULT_START_UP_DELAY_MS);
+
+	return ret;
+}
+
+static int stpmu1_buck_get_mode(struct udevice *dev)
+{
+	int ret;
+
+	ret = pmic_reg_read(dev->parent,
+			    STPMU1_BUCKX_CTRL_REG(dev->driver_data - 1));
+	if (ret < 0)
+		return ret;
+
+	return ret & STPMU1_BUCK_MODE ? STPMU1_BUCK_MODE_LP :
+					 STPMU1_BUCK_MODE_HP;
+}
+
+static int stpmu1_buck_set_mode(struct udevice *dev, int mode)
+{
+	return pmic_clrsetbits(dev->parent,
+			       STPMU1_BUCKX_CTRL_REG(dev->driver_data - 1),
+			       STPMU1_BUCK_MODE,
+			       mode ? STPMU1_BUCK_MODE : 0);
+}
+
+static int stpmu1_buck_probe(struct udevice *dev)
+{
+	struct dm_regulator_uclass_platdata *uc_pdata;
+
+	if (!dev->driver_data || dev->driver_data > STPMU1_MAX_BUCK)
+		return -EINVAL;
+
+	uc_pdata = dev_get_uclass_platdata(dev);
+
+	uc_pdata->type = REGULATOR_TYPE_BUCK;
+	uc_pdata->mode = (struct dm_regulator_mode *)buck_modes;
+	uc_pdata->mode_count = ARRAY_SIZE(buck_modes);
+
+	return 0;
+}
+
+static const struct dm_regulator_ops stpmu1_buck_ops = {
+	.get_value  = stpmu1_buck_get_value,
+	.set_value  = stpmu1_buck_set_value,
+	.get_enable = stpmu1_buck_get_enable,
+	.set_enable = stpmu1_buck_set_enable,
+	.get_mode   = stpmu1_buck_get_mode,
+	.set_mode   = stpmu1_buck_set_mode,
+};
+
+U_BOOT_DRIVER(stpmu1_buck) = {
+	.name = "stpmu1_buck",
+	.id = UCLASS_REGULATOR,
+	.ops = &stpmu1_buck_ops,
+	.probe = stpmu1_buck_probe,
+};
+
+/*
+ * LDO regulators
+ */
+
+static const struct stpmu1_range ldo12_ranges[] = {
+	STPMU1_RANGE(1700000, 0, 7, 0),
+	STPMU1_RANGE(1700000, 8, 24, 100000),
+	STPMU1_RANGE(3300000, 25, 31, 0),
+};
+
+static const struct stpmu1_range ldo3_ranges[] = {
+	STPMU1_RANGE(1700000, 0, 7, 0),
+	STPMU1_RANGE(1700000, 8, 24, 100000),
+	STPMU1_RANGE(3300000, 25, 30, 0),
+	/* Sel 31 is special case when LDO3 is in mode sync_source (BUCK2/2) */
+};
+
+static const struct stpmu1_range ldo5_ranges[] = {
+	STPMU1_RANGE(1700000, 0, 7, 0),
+	STPMU1_RANGE(1700000, 8, 30, 100000),
+	STPMU1_RANGE(3900000, 31, 31, 0),
+};
+
+static const struct stpmu1_range ldo6_ranges[] = {
+	STPMU1_RANGE(900000, 0, 24, 100000),
+	STPMU1_RANGE(3300000, 25, 31, 0),
+};
+
+/* LDO: 1,2,3,4,5,6 - voltage ranges */
+static const struct stpmu1_output_range ldo_voltage_range[] = {
+	STPMU1_OUTPUT_RANGE(ldo12_ranges, ARRAY_SIZE(ldo12_ranges)),
+	STPMU1_OUTPUT_RANGE(ldo12_ranges, ARRAY_SIZE(ldo12_ranges)),
+	STPMU1_OUTPUT_RANGE(ldo3_ranges, ARRAY_SIZE(ldo3_ranges)),
+	STPMU1_OUTPUT_RANGE(NULL, 0),
+	STPMU1_OUTPUT_RANGE(ldo5_ranges, ARRAY_SIZE(ldo5_ranges)),
+	STPMU1_OUTPUT_RANGE(ldo6_ranges, ARRAY_SIZE(ldo6_ranges)),
+};
+
+/* LDO modes */
+static const struct dm_regulator_mode ldo_modes[] = {
+	STPMU1_MODE(STPMU1_LDO_MODE_NORMAL,
+		    STPMU1_LDO_MODE_NORMAL, "NORMAL"),
+	STPMU1_MODE(STPMU1_LDO_MODE_BYPASS,
+		    STPMU1_LDO_MODE_BYPASS, "BYPASS"),
+	STPMU1_MODE(STPMU1_LDO_MODE_SINK_SOURCE,
+		    STPMU1_LDO_MODE_SINK_SOURCE, "SINK SOURCE"),
+};
+
+static int stpmu1_ldo_get_value(struct udevice *dev)
+{
+	int sel, ldo = dev->driver_data - 1;
+
+	sel = pmic_reg_read(dev->parent, STPMU1_LDOX_CTRL_REG(ldo));
+	if (sel < 0)
+		return sel;
+
+	/* ldo4 => 3,3V */
+	if (ldo == STPMU1_LDO4)
+		return STPMU1_LDO4_UV;
+
+	sel &= STPMU1_LDO12356_OUTPUT_MASK;
+	sel >>= STPMU1_LDO12356_OUTPUT_SHIFT;
+
+	/* ldo3, sel = 31 => BUCK2/2 */
+	if (ldo == STPMU1_LDO3 && sel == STPMU1_LDO3_DDR_SEL)
+		return stpmu1_buck_get_uv(dev->parent, STPMU1_BUCK2) / 2;
+
+	return stpmu1_output_find_uv(sel, &ldo_voltage_range[ldo]);
+}
+
+static int stpmu1_ldo_set_value(struct udevice *dev, int uv)
+{
+	int sel, ldo = dev->driver_data - 1;
+
+	/* ldo4 => not possible */
+	if (ldo == STPMU1_LDO4)
+		return -EINVAL;
+
+	sel = stpmu1_output_find_sel(uv, &ldo_voltage_range[ldo]);
+	if (sel < 0)
+		return sel;
+
+	return pmic_clrsetbits(dev->parent,
+			       STPMU1_LDOX_CTRL_REG(ldo),
+			       STPMU1_LDO12356_OUTPUT_MASK,
+			       sel << STPMU1_LDO12356_OUTPUT_SHIFT);
+}
+
+static int stpmu1_ldo_get_enable(struct udevice *dev)
+{
+	int ret;
+
+	ret = pmic_reg_read(dev->parent,
+			    STPMU1_LDOX_CTRL_REG(dev->driver_data - 1));
+	if (ret < 0)
+		return false;
+
+	return ret & STPMU1_LDO_EN ? true : false;
+}
+
+static int stpmu1_ldo_set_enable(struct udevice *dev, bool enable)
+{
+	struct dm_regulator_uclass_platdata *uc_pdata;
+	int ret, uv;
+
+	/* if regulator is already in the wanted state, nothing to do */
+	if (stpmu1_ldo_get_enable(dev) == enable)
+		return 0;
+
+	if (enable) {
+		uc_pdata = dev_get_uclass_platdata(dev);
+		uv = stpmu1_ldo_get_value(dev);
+		if ((uv < uc_pdata->min_uV) || (uv > uc_pdata->max_uV))
+			stpmu1_ldo_set_value(dev, uc_pdata->min_uV);
+	}
+
+	ret = pmic_clrsetbits(dev->parent,
+			      STPMU1_LDOX_CTRL_REG(dev->driver_data - 1),
+			      STPMU1_LDO_EN, enable ? STPMU1_LDO_EN : 0);
+	if (enable)
+		mdelay(STPMU1_DEFAULT_START_UP_DELAY_MS);
+
+	return ret;
+}
+
+static int stpmu1_ldo_get_mode(struct udevice *dev)
+{
+	int ret, ldo = dev->driver_data - 1;
+
+	if (ldo != STPMU1_LDO3)
+		return -EINVAL;
+
+	ret = pmic_reg_read(dev->parent, STPMU1_LDOX_CTRL_REG(ldo));
+	if (ret < 0)
+		return ret;
+
+	if (ret & STPMU1_LDO3_MODE)
+		return STPMU1_LDO_MODE_BYPASS;
+
+	ret &= STPMU1_LDO12356_OUTPUT_MASK;
+	ret >>= STPMU1_LDO12356_OUTPUT_SHIFT;
+
+	return ret == STPMU1_LDO3_DDR_SEL ? STPMU1_LDO_MODE_SINK_SOURCE :
+					     STPMU1_LDO_MODE_NORMAL;
+}
+
+static int stpmu1_ldo_set_mode(struct udevice *dev, int mode)
+{
+	int ret, ldo = dev->driver_data - 1;
+
+	if (ldo != STPMU1_LDO3)
+		return -EINVAL;
+
+	ret = pmic_reg_read(dev->parent, STPMU1_LDOX_CTRL_REG(ldo));
+	if (ret < 0)
+		return ret;
+
+	switch (mode) {
+	case STPMU1_LDO_MODE_SINK_SOURCE:
+		ret &= ~STPMU1_LDO12356_OUTPUT_MASK;
+		ret |= STPMU1_LDO3_DDR_SEL << STPMU1_LDO12356_OUTPUT_SHIFT;
+	case STPMU1_LDO_MODE_NORMAL:
+		ret &= ~STPMU1_LDO3_MODE;
+		break;
+	case STPMU1_LDO_MODE_BYPASS:
+		ret |= STPMU1_LDO3_MODE;
+		break;
+	}
+
+	return pmic_reg_write(dev->parent, STPMU1_LDOX_CTRL_REG(ldo), ret);
+}
+
+static int stpmu1_ldo_probe(struct udevice *dev)
+{
+	struct dm_regulator_uclass_platdata *uc_pdata;
+
+	if (!dev->driver_data || dev->driver_data > STPMU1_MAX_LDO)
+		return -EINVAL;
+
+	uc_pdata = dev_get_uclass_platdata(dev);
+
+	uc_pdata->type = REGULATOR_TYPE_LDO;
+	if (dev->driver_data - 1 == STPMU1_LDO3) {
+		uc_pdata->mode = (struct dm_regulator_mode *)ldo_modes;
+		uc_pdata->mode_count = ARRAY_SIZE(ldo_modes);
+	} else {
+		uc_pdata->mode_count = 0;
+	}
+
+	return 0;
+}
+
+static const struct dm_regulator_ops stpmu1_ldo_ops = {
+	.get_value  = stpmu1_ldo_get_value,
+	.set_value  = stpmu1_ldo_set_value,
+	.get_enable = stpmu1_ldo_get_enable,
+	.set_enable = stpmu1_ldo_set_enable,
+	.get_mode   = stpmu1_ldo_get_mode,
+	.set_mode   = stpmu1_ldo_set_mode,
+};
+
+U_BOOT_DRIVER(stpmu1_ldo) = {
+	.name = "stpmu1_ldo",
+	.id = UCLASS_REGULATOR,
+	.ops = &stpmu1_ldo_ops,
+	.probe = stpmu1_ldo_probe,
+};
+
+/*
+ * VREF DDR regulator
+ */
+
+static int stpmu1_vref_ddr_get_value(struct udevice *dev)
+{
+	/* BUCK2/2 */
+	return stpmu1_buck_get_uv(dev->parent, STPMU1_BUCK2) / 2;
+}
+
+static int stpmu1_vref_ddr_get_enable(struct udevice *dev)
+{
+	int ret;
+
+	ret = pmic_reg_read(dev->parent, STPMU1_VREF_CTRL_REG);
+	if (ret < 0)
+		return false;
+
+	return ret & STPMU1_VREF_EN ? true : false;
+}
+
+static int stpmu1_vref_ddr_set_enable(struct udevice *dev, bool enable)
+{
+	int ret;
+
+	/* if regulator is already in the wanted state, nothing to do */
+	if (stpmu1_vref_ddr_get_enable(dev) == enable)
+		return 0;
+
+	ret = pmic_clrsetbits(dev->parent, STPMU1_VREF_CTRL_REG,
+			      STPMU1_VREF_EN, enable ? STPMU1_VREF_EN : 0);
+	if (enable)
+		mdelay(STPMU1_DEFAULT_START_UP_DELAY_MS);
+
+	return ret;
+}
+
+static int stpmu1_vref_ddr_probe(struct udevice *dev)
+{
+	struct dm_regulator_uclass_platdata *uc_pdata;
+
+	uc_pdata = dev_get_uclass_platdata(dev);
+
+	uc_pdata->type = REGULATOR_TYPE_FIXED;
+	uc_pdata->mode_count = 0;
+
+	return 0;
+}
+
+static const struct dm_regulator_ops stpmu1_vref_ddr_ops = {
+	.get_value  = stpmu1_vref_ddr_get_value,
+	.get_enable = stpmu1_vref_ddr_get_enable,
+	.set_enable = stpmu1_vref_ddr_set_enable,
+};
+
+U_BOOT_DRIVER(stpmu1_vref_ddr) = {
+	.name = "stpmu1_vref_ddr",
+	.id = UCLASS_REGULATOR,
+	.ops = &stpmu1_vref_ddr_ops,
+	.probe = stpmu1_vref_ddr_probe,
+};
+
+/*
+ * BOOST regulator
+ */
+
+static int stpmu1_boost_get_enable(struct udevice *dev)
+{
+	int ret;
+
+	ret = pmic_reg_read(dev->parent, STPMU1_USB_CTRL_REG);
+	if (ret < 0)
+		return false;
+
+	return ret & STPMU1_USB_BOOST_EN ? true : false;
+}
+
+static int stpmu1_boost_set_enable(struct udevice *dev, bool enable)
+{
+	int ret;
+
+	ret = pmic_reg_read(dev->parent, STPMU1_USB_CTRL_REG);
+	if (ret < 0)
+		return ret;
+
+	if (!enable && ret & STPMU1_USB_PWR_SW_EN)
+		return -EINVAL;
+
+	/* if regulator is already in the wanted state, nothing to do */
+	if (!!(ret & STPMU1_USB_BOOST_EN) == enable)
+		return 0;
+
+	ret = pmic_clrsetbits(dev->parent, STPMU1_USB_CTRL_REG,
+			      STPMU1_USB_BOOST_EN,
+			      enable ? STPMU1_USB_BOOST_EN : 0);
+	if (enable)
+		mdelay(STPMU1_USB_BOOST_START_UP_DELAY_MS);
+
+	return ret;
+}
+
+static int stpmu1_boost_probe(struct udevice *dev)
+{
+	struct dm_regulator_uclass_platdata *uc_pdata;
+
+	uc_pdata = dev_get_uclass_platdata(dev);
+
+	uc_pdata->type = REGULATOR_TYPE_FIXED;
+	uc_pdata->mode_count = 0;
+
+	return 0;
+}
+
+static const struct dm_regulator_ops stpmu1_boost_ops = {
+	.get_enable = stpmu1_boost_get_enable,
+	.set_enable = stpmu1_boost_set_enable,
+};
+
+U_BOOT_DRIVER(stpmu1_boost) = {
+	.name = "stpmu1_boost",
+	.id = UCLASS_REGULATOR,
+	.ops = &stpmu1_boost_ops,
+	.probe = stpmu1_boost_probe,
+};
+
+/*
+ * USB power switch
+ */
+
+static int stpmu1_pwr_sw_get_enable(struct udevice *dev)
+{
+	uint mask = 1 << dev->driver_data;
+	int ret;
+
+	ret = pmic_reg_read(dev->parent, STPMU1_USB_CTRL_REG);
+	if (ret < 0)
+		return false;
+
+	return ret & mask ? true : false;
+}
+
+static int stpmu1_pwr_sw_set_enable(struct udevice *dev, bool enable)
+{
+	uint mask = 1 << dev->driver_data;
+	int ret;
+
+	ret = pmic_reg_read(dev->parent, STPMU1_USB_CTRL_REG);
+	if (ret < 0)
+		return ret;
+
+	/* if regulator is already in the wanted state, nothing to do */
+	if (!!(ret & mask) == enable)
+		return 0;
+
+	/* Boost management */
+	if (enable && !(ret & STPMU1_USB_BOOST_EN)) {
+		pmic_clrsetbits(dev->parent, STPMU1_USB_CTRL_REG,
+				STPMU1_USB_BOOST_EN, STPMU1_USB_BOOST_EN);
+		mdelay(STPMU1_USB_BOOST_START_UP_DELAY_MS);
+	} else if (!enable && ret & STPMU1_USB_BOOST_EN &&
+		   (ret & STPMU1_USB_PWR_SW_EN) != STPMU1_USB_PWR_SW_EN) {
+		pmic_clrsetbits(dev->parent, STPMU1_USB_CTRL_REG,
+				STPMU1_USB_BOOST_EN, 0);
+	}
+
+	ret = pmic_clrsetbits(dev->parent, STPMU1_USB_CTRL_REG,
+			      mask, enable ? mask : 0);
+	if (enable)
+		mdelay(STPMU1_DEFAULT_START_UP_DELAY_MS);
+
+	return ret;
+}
+
+static int stpmu1_pwr_sw_probe(struct udevice *dev)
+{
+	struct dm_regulator_uclass_platdata *uc_pdata;
+
+	if (!dev->driver_data || dev->driver_data > STPMU1_MAX_PWR_SW)
+		return -EINVAL;
+
+	uc_pdata = dev_get_uclass_platdata(dev);
+
+	uc_pdata->type = REGULATOR_TYPE_FIXED;
+	uc_pdata->mode_count = 0;
+
+	return 0;
+}
+
+static const struct dm_regulator_ops stpmu1_pwr_sw_ops = {
+	.get_enable = stpmu1_pwr_sw_get_enable,
+	.set_enable = stpmu1_pwr_sw_set_enable,
+};
+
+U_BOOT_DRIVER(stpmu1_pwr_sw) = {
+	.name = "stpmu1_pwr_sw",
+	.id = UCLASS_REGULATOR,
+	.ops = &stpmu1_pwr_sw_ops,
+	.probe = stpmu1_pwr_sw_probe,
+};