diff mbox series

[V12,7/9] regulator: Add a regulator driver for the PM8008 PMIC

Message ID 1652275113-10277-8-git-send-email-quic_c_skakit@quicinc.com (mailing list archive)
State Superseded
Headers show
Series Add Qualcomm Technologies, Inc. PM8008 regulator driver | expand

Commit Message

Satya Priya Kakitapalli (Temp) May 11, 2022, 1:18 p.m. UTC 
Qualcomm Technologies, Inc. PM8008 is an I2C controlled PMIC
containing 7 LDO regulators.  Add a PM8008 regulator driver to
support PMIC regulator management via the regulator framework.

Signed-off-by: Satya Priya <quic_c_skakit@quicinc.com>
---
Changes in V12:
 - Get base from reg property in DT node.

Changes in V11:
 - Added of_device_id table and compatible to register the ldos.

Changes in V10:
 - Changed the driver name.
 - Removed unused header.
 - Use get_voltage_sel.

Changes in V9:
 - Nothing has changed.

Changes in V8:
 - Changed the regulators_data struct name to pm8008_regulator_data

 drivers/regulator/Kconfig                 |   9 ++
 drivers/regulator/Makefile                |   1 +
 drivers/regulator/qcom-pm8008-regulator.c | 221 ++++++++++++++++++++++++++++++
 3 files changed, 231 insertions(+)
 create mode 100644 drivers/regulator/qcom-pm8008-regulator.c

Comments

Dan Carpenter May 16, 2022, 12:12 p.m. UTC | #1 
Hi Satya,

url:    https://github.com/intel-lab-lkp/linux/commits/Satya-Priya/Add-Qualcomm-Technologies-Inc-PM8008-regulator-driver/20220511-212136
base:   https://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd.git for-mfd-next
config: nios2-randconfig-m031-20220512 (https://download.01.org/0day-ci/archive/20220513/202205130908.O31s3mhc-lkp@intel.com/config)
compiler: nios2-linux-gcc (GCC) 11.3.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>

New smatch warnings:
drivers/regulator/qcom-pm8008-regulator.c:174 pm8008_regulator_probe() error: buffer overflow 'reg_data' 7 <= 7 (assuming for loop doesn't break)

Old smatch warnings:
drivers/regulator/qcom-pm8008-regulator.c:175 pm8008_regulator_probe() error: buffer overflow 'reg_data' 7 <= 7 (assuming for loop doesn't break)
drivers/regulator/qcom-pm8008-regulator.c:176 pm8008_regulator_probe() error: buffer overflow 'reg_data' 7 <= 7 (assuming for loop doesn't break)
drivers/regulator/qcom-pm8008-regulator.c:178 pm8008_regulator_probe() error: buffer overflow 'reg_data' 7 <= 7 (assuming for loop doesn't break)
drivers/regulator/qcom-pm8008-regulator.c:180 pm8008_regulator_probe() error: buffer overflow 'reg_data' 7 <= 7 (assuming for loop doesn't break)
drivers/regulator/qcom-pm8008-regulator.c:180 pm8008_regulator_probe() error: buffer overflow 'reg_data' 7 <= 7 (assuming for loop doesn't break)
drivers/regulator/qcom-pm8008-regulator.c:182 pm8008_regulator_probe() error: buffer overflow 'reg_data' 7 <= 7 (assuming for loop doesn't break)
drivers/regulator/qcom-pm8008-regulator.c:186 pm8008_regulator_probe() error: buffer overflow 'reg_data' 7 <= 7 (assuming for loop doesn't break)
drivers/regulator/qcom-pm8008-regulator.c:196 pm8008_regulator_probe() error: buffer overflow 'reg_data' 7 <= 7 (assuming for loop doesn't break)

vim +174 drivers/regulator/qcom-pm8008-regulator.c

3337142527c77d Satya Priya 2022-05-11  122  static int pm8008_regulator_probe(struct platform_device *pdev)
3337142527c77d Satya Priya 2022-05-11  123  {
3337142527c77d Satya Priya 2022-05-11  124  	int rc, i;
3337142527c77d Satya Priya 2022-05-11  125  	u32 base;
3337142527c77d Satya Priya 2022-05-11  126  	unsigned int reg;
3337142527c77d Satya Priya 2022-05-11  127  	const char *name;
3337142527c77d Satya Priya 2022-05-11  128  	struct device *dev = &pdev->dev;
3337142527c77d Satya Priya 2022-05-11  129  	struct regulator_config reg_config = {};
3337142527c77d Satya Priya 2022-05-11  130  	struct regulator_dev    *rdev;
3337142527c77d Satya Priya 2022-05-11  131  	const struct pm8008_data *chip = dev_get_drvdata(pdev->dev.parent);
3337142527c77d Satya Priya 2022-05-11  132  	struct pm8008_regulator *pm8008_reg;
3337142527c77d Satya Priya 2022-05-11  133  
3337142527c77d Satya Priya 2022-05-11  134  	pm8008_reg = devm_kzalloc(dev, sizeof(*pm8008_reg), GFP_KERNEL);
3337142527c77d Satya Priya 2022-05-11  135  	if (!pm8008_reg)
3337142527c77d Satya Priya 2022-05-11  136  		return -ENOMEM;
3337142527c77d Satya Priya 2022-05-11  137  
3337142527c77d Satya Priya 2022-05-11  138  	pm8008_reg->regmap = pm8008_get_regmap(chip);
3337142527c77d Satya Priya 2022-05-11  139  	if (!pm8008_reg->regmap) {
3337142527c77d Satya Priya 2022-05-11  140  		dev_err(dev, "parent regmap is missing\n");
3337142527c77d Satya Priya 2022-05-11  141  		return -EINVAL;
3337142527c77d Satya Priya 2022-05-11  142  	}
3337142527c77d Satya Priya 2022-05-11  143  
3337142527c77d Satya Priya 2022-05-11  144  	pm8008_reg->dev = dev;
3337142527c77d Satya Priya 2022-05-11  145  
3337142527c77d Satya Priya 2022-05-11  146  	rc = of_property_read_string(dev->of_node, "regulator-name", &name);
3337142527c77d Satya Priya 2022-05-11  147  	if (rc)
3337142527c77d Satya Priya 2022-05-11  148  		return rc;
3337142527c77d Satya Priya 2022-05-11  149  
3337142527c77d Satya Priya 2022-05-11  150  	/* get the required regulator data */
3337142527c77d Satya Priya 2022-05-11  151  	for (i = 0; i < ARRAY_SIZE(reg_data); i++)
3337142527c77d Satya Priya 2022-05-11  152  		if (strstr(name, reg_data[i].name))
3337142527c77d Satya Priya 2022-05-11  153  			break;

This code assumes that we will find a match but it would be more robust
to add a check.

	if (i == ARRAY_SIZE(reg_data))
		return -ENODEV;

3337142527c77d Satya Priya 2022-05-11  154  
3337142527c77d Satya Priya 2022-05-11  155  	rc = of_property_read_u32_index(dev->of_node, "reg", 1, &base);
3337142527c77d Satya Priya 2022-05-11  156  	if (rc < 0) {
3337142527c77d Satya Priya 2022-05-11  157  		dev_err(dev, "%s: failed to get regulator base rc=%d\n", name, rc);
3337142527c77d Satya Priya 2022-05-11  158  		return rc;
3337142527c77d Satya Priya 2022-05-11  159  	}
3337142527c77d Satya Priya 2022-05-11  160  	pm8008_reg->base = base;
3337142527c77d Satya Priya 2022-05-11  161  
3337142527c77d Satya Priya 2022-05-11  162  	/* get slew rate */
3337142527c77d Satya Priya 2022-05-11  163  	rc = regmap_bulk_read(pm8008_reg->regmap,
3337142527c77d Satya Priya 2022-05-11  164  			LDO_STEPPER_CTL_REG(pm8008_reg->base), &reg, 1);
3337142527c77d Satya Priya 2022-05-11  165  	if (rc < 0) {
3337142527c77d Satya Priya 2022-05-11  166  		dev_err(dev, "failed to read step rate configuration rc=%d\n", rc);
3337142527c77d Satya Priya 2022-05-11  167  		return rc;
3337142527c77d Satya Priya 2022-05-11  168  	}
3337142527c77d Satya Priya 2022-05-11  169  	reg &= STEP_RATE_MASK;
3337142527c77d Satya Priya 2022-05-11  170  	pm8008_reg->step_rate = DEFAULT_VOLTAGE_STEPPER_RATE >> reg;
3337142527c77d Satya Priya 2022-05-11  171  
3337142527c77d Satya Priya 2022-05-11  172  	pm8008_reg->rdesc.type = REGULATOR_VOLTAGE;
3337142527c77d Satya Priya 2022-05-11  173  	pm8008_reg->rdesc.ops = &pm8008_regulator_ops;
3337142527c77d Satya Priya 2022-05-11 @174  	pm8008_reg->rdesc.name = reg_data[i].name;
3337142527c77d Satya Priya 2022-05-11  175  	pm8008_reg->rdesc.supply_name = reg_data[i].supply_name;
3337142527c77d Satya Priya 2022-05-11  176  	pm8008_reg->rdesc.of_match = reg_data[i].name;
3337142527c77d Satya Priya 2022-05-11  177  	pm8008_reg->rdesc.uV_step = VSET_STEP_UV;
3337142527c77d Satya Priya 2022-05-11  178  	pm8008_reg->rdesc.min_uV = reg_data[i].min_uv;
3337142527c77d Satya Priya 2022-05-11  179  	pm8008_reg->rdesc.n_voltages
3337142527c77d Satya Priya 2022-05-11  180  		= ((reg_data[i].max_uv - reg_data[i].min_uv)
3337142527c77d Satya Priya 2022-05-11  181  			/ pm8008_reg->rdesc.uV_step) + 1;
3337142527c77d Satya Priya 2022-05-11  182  	pm8008_reg->rdesc.linear_ranges = reg_data[i].voltage_range;
3337142527c77d Satya Priya 2022-05-11  183  	pm8008_reg->rdesc.n_linear_ranges = 1;
3337142527c77d Satya Priya 2022-05-11  184  	pm8008_reg->rdesc.enable_reg = LDO_ENABLE_REG(pm8008_reg->base);
3337142527c77d Satya Priya 2022-05-11  185  	pm8008_reg->rdesc.enable_mask = ENABLE_BIT;
3337142527c77d Satya Priya 2022-05-11  186  	pm8008_reg->rdesc.min_dropout_uV = reg_data[i].min_dropout_uv;
3337142527c77d Satya Priya 2022-05-11  187  	pm8008_reg->voltage_selector = -ENOTRECOVERABLE;
3337142527c77d Satya Priya 2022-05-11  188  
3337142527c77d Satya Priya 2022-05-11  189  	reg_config.dev = dev->parent;
3337142527c77d Satya Priya 2022-05-11  190  	reg_config.driver_data = pm8008_reg;
3337142527c77d Satya Priya 2022-05-11  191  	reg_config.regmap = pm8008_reg->regmap;
3337142527c77d Satya Priya 2022-05-11  192  
3337142527c77d Satya Priya 2022-05-11  193  	rdev = devm_regulator_register(dev, &pm8008_reg->rdesc, &reg_config);
3337142527c77d Satya Priya 2022-05-11  194  	if (IS_ERR(rdev)) {
3337142527c77d Satya Priya 2022-05-11  195  		rc = PTR_ERR(rdev);
3337142527c77d Satya Priya 2022-05-11  196  		dev_err(dev, "%s: failed to register regulator rc=%d\n",
3337142527c77d Satya Priya 2022-05-11  197  				reg_data[i].name, rc);
3337142527c77d Satya Priya 2022-05-11  198  		return rc;
3337142527c77d Satya Priya 2022-05-11  199  	}
3337142527c77d Satya Priya 2022-05-11  200  
3337142527c77d Satya Priya 2022-05-11  201  	return 0;
3337142527c77d Satya Priya 2022-05-11  202  }
Stephen Boyd May 16, 2022, 7:03 p.m. UTC | #2 
Quoting Satya Priya (2022-05-11 06:18:31)
> diff --git a/drivers/regulator/qcom-pm8008-regulator.c b/drivers/regulator/qcom-pm8008-regulator.c
> new file mode 100644
> index 0000000..0361f02
> --- /dev/null
> +++ b/drivers/regulator/qcom-pm8008-regulator.c
> @@ -0,0 +1,221 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/* Copyright (c) 2022, The Linux Foundation. All rights reserved. */
> +
> +#include <linux/device.h>
> +#include <linux/kernel.h>
> +#include <linux/mfd/qcom_pm8008.h>
> +#include <linux/module.h>
> +#include <linux/of.h>

Is this include used?

> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/regulator/driver.h>
> +#include <linux/regulator/of_regulator.h>

Is this include used?

> +
> +#define VSET_STEP_MV                   8
> +#define VSET_STEP_UV                   (VSET_STEP_MV * 1000)
> +
> +#define LDO_ENABLE_REG(base)           ((base) + 0x46)
> +#define ENABLE_BIT                     BIT(7)
> +
> +#define LDO_VSET_LB_REG(base)          ((base) + 0x40)
> +
> +#define LDO_STEPPER_CTL_REG(base)      ((base) + 0x3b)
> +#define DEFAULT_VOLTAGE_STEPPER_RATE   38400
> +#define STEP_RATE_MASK                 GENMASK(1, 0)
> +
> +struct pm8008_regulator_data {
> +       const char                      *name;
> +       const char                      *supply_name;
> +       int                             min_uv;
> +       int                             max_uv;
> +       int                             min_dropout_uv;
> +       const struct linear_range       *voltage_range;
> +};
> +
> +struct pm8008_regulator {
> +       struct device           *dev;
> +       struct regmap           *regmap;
> +       struct regulator_desc   rdesc;
> +       u16                     base;
> +       int                     step_rate;
> +       int                     voltage_selector;
> +};
> +
> +static const struct linear_range nldo_ranges[] = {
> +       REGULATOR_LINEAR_RANGE(528000, 0, 122, 8000),
> +};
> +
> +static const struct linear_range pldo_ranges[] = {
> +       REGULATOR_LINEAR_RANGE(1504000, 0, 237, 8000),
> +};
> +
> +static const struct pm8008_regulator_data reg_data[] = {
> +       /* name  parent       min_uv  max_uv  headroom_uv voltage_range */
> +       { "ldo1", "vdd_l1_l2", 528000, 1504000, 225000, nldo_ranges, },
> +       { "ldo2", "vdd_l1_l2", 528000, 1504000, 225000, nldo_ranges, },
> +       { "ldo3", "vdd_l3_l4", 1504000, 3400000, 300000, pldo_ranges, },
> +       { "ldo4", "vdd_l3_l4", 1504000, 3400000, 300000, pldo_ranges, },
> +       { "ldo5", "vdd_l5",    1504000, 3400000, 200000, pldo_ranges, },
> +       { "ldo6", "vdd_l6",    1504000, 3400000, 200000, pldo_ranges, },
> +       { "ldo7", "vdd_l7",    1504000, 3400000, 200000, pldo_ranges, },
> +};
> +
> +static int pm8008_regulator_get_voltage(struct regulator_dev *rdev)
> +{
> +       struct pm8008_regulator *pm8008_reg = rdev_get_drvdata(rdev);
> +
> +       return pm8008_reg->voltage_selector;
> +}
> +
> +static inline int pm8008_write_voltage(struct pm8008_regulator *pm8008_reg,
> +                                                       int mV)
> +{
> +       __le16 vset_raw;
> +
> +       vset_raw = cpu_to_le16(mV);
> +
> +       return regmap_bulk_write(pm8008_reg->regmap,
> +                       LDO_VSET_LB_REG(pm8008_reg->base),
> +                       (const void *)&vset_raw, sizeof(vset_raw));

Does sparse complain about casting away __le16?

> +}
> +
> +static int pm8008_regulator_set_voltage_time(struct regulator_dev *rdev,
> +                               int old_uV, int new_uv)
> +{
> +       struct pm8008_regulator *pm8008_reg = rdev_get_drvdata(rdev);
> +
> +       return DIV_ROUND_UP(abs(new_uv - old_uV), pm8008_reg->step_rate);
> +}
> +
Satya Priya Kakitapalli (Temp) May 19, 2022, 12:06 p.m. UTC | #3 
On 5/17/2022 12:33 AM, Stephen Boyd wrote:
> Quoting Satya Priya (2022-05-11 06:18:31)
>> diff --git a/drivers/regulator/qcom-pm8008-regulator.c b/drivers/regulator/qcom-pm8008-regulator.c
>> new file mode 100644
>> index 0000000..0361f02
>> --- /dev/null
>> +++ b/drivers/regulator/qcom-pm8008-regulator.c
>> @@ -0,0 +1,221 @@
>> +// SPDX-License-Identifier: GPL-2.0-only
>> +/* Copyright (c) 2022, The Linux Foundation. All rights reserved. */
>> +
>> +#include <linux/device.h>
>> +#include <linux/kernel.h>
>> +#include <linux/mfd/qcom_pm8008.h>
>> +#include <linux/module.h>
>> +#include <linux/of.h>
> Is this include used?


This is used for of_property_read_* APIs.


>> +#include <linux/of_device.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/regmap.h>
>> +#include <linux/regulator/driver.h>
>> +#include <linux/regulator/of_regulator.h>
> Is this include used?


This is not required, I will remove this.


>> +
>> +#define VSET_STEP_MV                   8
>> +#define VSET_STEP_UV                   (VSET_STEP_MV * 1000)
>> +
>> +#define LDO_ENABLE_REG(base)           ((base) + 0x46)
>> +#define ENABLE_BIT                     BIT(7)
>> +
>> +#define LDO_VSET_LB_REG(base)          ((base) + 0x40)
>> +
>> +#define LDO_STEPPER_CTL_REG(base)      ((base) + 0x3b)
>> +#define DEFAULT_VOLTAGE_STEPPER_RATE   38400
>> +#define STEP_RATE_MASK                 GENMASK(1, 0)
>> +
>> +struct pm8008_regulator_data {
>> +       const char                      *name;
>> +       const char                      *supply_name;
>> +       int                             min_uv;
>> +       int                             max_uv;
>> +       int                             min_dropout_uv;
>> +       const struct linear_range       *voltage_range;
>> +};
>> +
>> +struct pm8008_regulator {
>> +       struct device           *dev;
>> +       struct regmap           *regmap;
>> +       struct regulator_desc   rdesc;
>> +       u16                     base;
>> +       int                     step_rate;
>> +       int                     voltage_selector;
>> +};
>> +
>> +static const struct linear_range nldo_ranges[] = {
>> +       REGULATOR_LINEAR_RANGE(528000, 0, 122, 8000),
>> +};
>> +
>> +static const struct linear_range pldo_ranges[] = {
>> +       REGULATOR_LINEAR_RANGE(1504000, 0, 237, 8000),
>> +};
>> +
>> +static const struct pm8008_regulator_data reg_data[] = {
>> +       /* name  parent       min_uv  max_uv  headroom_uv voltage_range */
>> +       { "ldo1", "vdd_l1_l2", 528000, 1504000, 225000, nldo_ranges, },
>> +       { "ldo2", "vdd_l1_l2", 528000, 1504000, 225000, nldo_ranges, },
>> +       { "ldo3", "vdd_l3_l4", 1504000, 3400000, 300000, pldo_ranges, },
>> +       { "ldo4", "vdd_l3_l4", 1504000, 3400000, 300000, pldo_ranges, },
>> +       { "ldo5", "vdd_l5",    1504000, 3400000, 200000, pldo_ranges, },
>> +       { "ldo6", "vdd_l6",    1504000, 3400000, 200000, pldo_ranges, },
>> +       { "ldo7", "vdd_l7",    1504000, 3400000, 200000, pldo_ranges, },
>> +};
>> +
>> +static int pm8008_regulator_get_voltage(struct regulator_dev *rdev)
>> +{
>> +       struct pm8008_regulator *pm8008_reg = rdev_get_drvdata(rdev);
>> +
>> +       return pm8008_reg->voltage_selector;
>> +}
>> +
>> +static inline int pm8008_write_voltage(struct pm8008_regulator *pm8008_reg,
>> +                                                       int mV)
>> +{
>> +       __le16 vset_raw;
>> +
>> +       vset_raw = cpu_to_le16(mV);
>> +
>> +       return regmap_bulk_write(pm8008_reg->regmap,
>> +                       LDO_VSET_LB_REG(pm8008_reg->base),
>> +                       (const void *)&vset_raw, sizeof(vset_raw));
> Does sparse complain about casting away __le16?


No.


>> +}
>> +
>> +static int pm8008_regulator_set_voltage_time(struct regulator_dev *rdev,
>> +                               int old_uV, int new_uv)
>> +{
>> +       struct pm8008_regulator *pm8008_reg = rdev_get_drvdata(rdev);
>> +
>> +       return DIV_ROUND_UP(abs(new_uv - old_uV), pm8008_reg->step_rate);
>> +}
>> +
diff mbox series

Patch

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index cbe0f96..2c6d9c2 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -925,6 +925,15 @@  config REGULATOR_PWM
 	  This driver supports PWM controlled voltage regulators. PWM
 	  duty cycle can increase or decrease the voltage.
 
+config REGULATOR_QCOM_PM8008
+	tristate "Qualcomm Technologies, Inc. PM8008 PMIC regulators"
+	depends on MFD_QCOM_PM8008
+	help
+	  Select this option to get support for the voltage regulators
+	  of Qualcomm Technologies, Inc. PM8008 PMIC chip. PM8008 has 7 LDO
+	  regulators. This driver provides support for basic operations like
+	  set/get voltage and enable/disable.
+
 config REGULATOR_QCOM_RPM
 	tristate "Qualcomm RPM regulator driver"
 	depends on MFD_QCOM_RPM
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 8d3ee8b..169e686 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -101,6 +101,7 @@  obj-$(CONFIG_REGULATOR_MT6380)	+= mt6380-regulator.o
 obj-$(CONFIG_REGULATOR_MT6397)	+= mt6397-regulator.o
 obj-$(CONFIG_REGULATOR_MTK_DVFSRC) += mtk-dvfsrc-regulator.o
 obj-$(CONFIG_REGULATOR_QCOM_LABIBB) += qcom-labibb-regulator.o
+obj-$(CONFIG_REGULATOR_QCOM_PM8008) += qcom-pm8008-regulator.o
 obj-$(CONFIG_REGULATOR_QCOM_RPM) += qcom_rpm-regulator.o
 obj-$(CONFIG_REGULATOR_QCOM_RPMH) += qcom-rpmh-regulator.o
 obj-$(CONFIG_REGULATOR_QCOM_SMD_RPM) += qcom_smd-regulator.o
diff --git a/drivers/regulator/qcom-pm8008-regulator.c b/drivers/regulator/qcom-pm8008-regulator.c
new file mode 100644
index 0000000..0361f02
--- /dev/null
+++ b/drivers/regulator/qcom-pm8008-regulator.c
@@ -0,0 +1,221 @@ 
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (c) 2022, The Linux Foundation. All rights reserved. */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/mfd/qcom_pm8008.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/of_regulator.h>
+
+#define VSET_STEP_MV			8
+#define VSET_STEP_UV			(VSET_STEP_MV * 1000)
+
+#define LDO_ENABLE_REG(base)		((base) + 0x46)
+#define ENABLE_BIT			BIT(7)
+
+#define LDO_VSET_LB_REG(base)		((base) + 0x40)
+
+#define LDO_STEPPER_CTL_REG(base)	((base) + 0x3b)
+#define DEFAULT_VOLTAGE_STEPPER_RATE	38400
+#define STEP_RATE_MASK			GENMASK(1, 0)
+
+struct pm8008_regulator_data {
+	const char			*name;
+	const char			*supply_name;
+	int				min_uv;
+	int				max_uv;
+	int				min_dropout_uv;
+	const struct linear_range	*voltage_range;
+};
+
+struct pm8008_regulator {
+	struct device		*dev;
+	struct regmap		*regmap;
+	struct regulator_desc	rdesc;
+	u16			base;
+	int			step_rate;
+	int			voltage_selector;
+};
+
+static const struct linear_range nldo_ranges[] = {
+	REGULATOR_LINEAR_RANGE(528000, 0, 122, 8000),
+};
+
+static const struct linear_range pldo_ranges[] = {
+	REGULATOR_LINEAR_RANGE(1504000, 0, 237, 8000),
+};
+
+static const struct pm8008_regulator_data reg_data[] = {
+	/* name  parent       min_uv  max_uv  headroom_uv voltage_range */
+	{ "ldo1", "vdd_l1_l2", 528000, 1504000, 225000, nldo_ranges, },
+	{ "ldo2", "vdd_l1_l2", 528000, 1504000, 225000, nldo_ranges, },
+	{ "ldo3", "vdd_l3_l4", 1504000, 3400000, 300000, pldo_ranges, },
+	{ "ldo4", "vdd_l3_l4", 1504000, 3400000, 300000, pldo_ranges, },
+	{ "ldo5", "vdd_l5",    1504000, 3400000, 200000, pldo_ranges, },
+	{ "ldo6", "vdd_l6",    1504000, 3400000, 200000, pldo_ranges, },
+	{ "ldo7", "vdd_l7",    1504000, 3400000, 200000, pldo_ranges, },
+};
+
+static int pm8008_regulator_get_voltage(struct regulator_dev *rdev)
+{
+	struct pm8008_regulator *pm8008_reg = rdev_get_drvdata(rdev);
+
+	return pm8008_reg->voltage_selector;
+}
+
+static inline int pm8008_write_voltage(struct pm8008_regulator *pm8008_reg,
+							int mV)
+{
+	__le16 vset_raw;
+
+	vset_raw = cpu_to_le16(mV);
+
+	return regmap_bulk_write(pm8008_reg->regmap,
+			LDO_VSET_LB_REG(pm8008_reg->base),
+			(const void *)&vset_raw, sizeof(vset_raw));
+}
+
+static int pm8008_regulator_set_voltage_time(struct regulator_dev *rdev,
+				int old_uV, int new_uv)
+{
+	struct pm8008_regulator *pm8008_reg = rdev_get_drvdata(rdev);
+
+	return DIV_ROUND_UP(abs(new_uv - old_uV), pm8008_reg->step_rate);
+}
+
+static int pm8008_regulator_set_voltage(struct regulator_dev *rdev,
+					unsigned int selector)
+{
+	struct pm8008_regulator *pm8008_reg = rdev_get_drvdata(rdev);
+	int rc, mV;
+
+	/* voltage control register is set with voltage in millivolts */
+	mV = DIV_ROUND_UP(regulator_list_voltage_linear_range(rdev, selector),
+						1000);
+	if (mV < 0)
+		return mV;
+
+	rc = pm8008_write_voltage(pm8008_reg, mV);
+	if (rc < 0)
+		return rc;
+
+	pm8008_reg->voltage_selector = selector;
+	dev_dbg(&rdev->dev, "voltage set to %d\n", mV * 1000);
+	return 0;
+}
+
+static const struct regulator_ops pm8008_regulator_ops = {
+	.enable			= regulator_enable_regmap,
+	.disable		= regulator_disable_regmap,
+	.is_enabled		= regulator_is_enabled_regmap,
+	.set_voltage_sel	= pm8008_regulator_set_voltage,
+	.get_voltage_sel	= pm8008_regulator_get_voltage,
+	.list_voltage		= regulator_list_voltage_linear,
+	.set_voltage_time	= pm8008_regulator_set_voltage_time,
+};
+
+static int pm8008_regulator_probe(struct platform_device *pdev)
+{
+	int rc, i;
+	u32 base;
+	unsigned int reg;
+	const char *name;
+	struct device *dev = &pdev->dev;
+	struct regulator_config reg_config = {};
+	struct regulator_dev    *rdev;
+	const struct pm8008_data *chip = dev_get_drvdata(pdev->dev.parent);
+	struct pm8008_regulator *pm8008_reg;
+
+	pm8008_reg = devm_kzalloc(dev, sizeof(*pm8008_reg), GFP_KERNEL);
+	if (!pm8008_reg)
+		return -ENOMEM;
+
+	pm8008_reg->regmap = pm8008_get_regmap(chip);
+	if (!pm8008_reg->regmap) {
+		dev_err(dev, "parent regmap is missing\n");
+		return -EINVAL;
+	}
+
+	pm8008_reg->dev = dev;
+
+	rc = of_property_read_string(dev->of_node, "regulator-name", &name);
+	if (rc)
+		return rc;
+
+	/* get the required regulator data */
+	for (i = 0; i < ARRAY_SIZE(reg_data); i++)
+		if (strstr(name, reg_data[i].name))
+			break;
+
+	rc = of_property_read_u32_index(dev->of_node, "reg", 1, &base);
+	if (rc < 0) {
+		dev_err(dev, "%s: failed to get regulator base rc=%d\n", name, rc);
+		return rc;
+	}
+	pm8008_reg->base = base;
+
+	/* get slew rate */
+	rc = regmap_bulk_read(pm8008_reg->regmap,
+			LDO_STEPPER_CTL_REG(pm8008_reg->base), &reg, 1);
+	if (rc < 0) {
+		dev_err(dev, "failed to read step rate configuration rc=%d\n", rc);
+		return rc;
+	}
+	reg &= STEP_RATE_MASK;
+	pm8008_reg->step_rate = DEFAULT_VOLTAGE_STEPPER_RATE >> reg;
+
+	pm8008_reg->rdesc.type = REGULATOR_VOLTAGE;
+	pm8008_reg->rdesc.ops = &pm8008_regulator_ops;
+	pm8008_reg->rdesc.name = reg_data[i].name;
+	pm8008_reg->rdesc.supply_name = reg_data[i].supply_name;
+	pm8008_reg->rdesc.of_match = reg_data[i].name;
+	pm8008_reg->rdesc.uV_step = VSET_STEP_UV;
+	pm8008_reg->rdesc.min_uV = reg_data[i].min_uv;
+	pm8008_reg->rdesc.n_voltages
+		= ((reg_data[i].max_uv - reg_data[i].min_uv)
+			/ pm8008_reg->rdesc.uV_step) + 1;
+	pm8008_reg->rdesc.linear_ranges = reg_data[i].voltage_range;
+	pm8008_reg->rdesc.n_linear_ranges = 1;
+	pm8008_reg->rdesc.enable_reg = LDO_ENABLE_REG(pm8008_reg->base);
+	pm8008_reg->rdesc.enable_mask = ENABLE_BIT;
+	pm8008_reg->rdesc.min_dropout_uV = reg_data[i].min_dropout_uv;
+	pm8008_reg->voltage_selector = -ENOTRECOVERABLE;
+
+	reg_config.dev = dev->parent;
+	reg_config.driver_data = pm8008_reg;
+	reg_config.regmap = pm8008_reg->regmap;
+
+	rdev = devm_regulator_register(dev, &pm8008_reg->rdesc, &reg_config);
+	if (IS_ERR(rdev)) {
+		rc = PTR_ERR(rdev);
+		dev_err(dev, "%s: failed to register regulator rc=%d\n",
+				reg_data[i].name, rc);
+		return rc;
+	}
+
+	return 0;
+}
+
+static const struct of_device_id pm8008_regulator_match_table[] = {
+	{ .compatible = "qcom,pm8008-regulator", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, pm8008_regulator_match_table);
+
+static struct platform_driver pm8008_regulator_driver = {
+	.driver	= {
+		.name		= "qcom-pm8008-regulator",
+		.of_match_table	= pm8008_regulator_match_table,
+	},
+	.probe	= pm8008_regulator_probe,
+};
+
+module_platform_driver(pm8008_regulator_driver);
+
+MODULE_DESCRIPTION("Qualcomm PM8008 PMIC Regulator Driver");
+MODULE_LICENSE("GPL");