[PATCH V14 7/9] regulator: Add a regulator driver for the PM8008 PMIC

From: Satya Priya
Date: Tue Jun 07 2022 - 07:51:59 EST

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@xxxxxxxxxxx>
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
---
Changes in V14:
- Remove unused headers and debug prints.
- Remove min_uv and max_uv from reg_data[] and set the min/max based
on the voltage_range pointer.
- In get_voltage_sel read voltage from hw and calculate selector instead
of using selector from set_voltage.
- Add errro check after regulator_list_voltage_linear_range().
- Use static_assert to make sure nldo_ranges & pldo_ranges doesn't become
larger and we forget to update the pm8008_reg->rdesc.n_linear_ranges

Changes in V13:
- Added if check to avoid buffer overflow warnings.
for (i = 0; i < ARRAY_SIZE(reg_data); i++)
if (strstr(name, reg_data[i].name))
break;
if (i == ARRAY_SIZE(reg_data)) {
dev_err(dev, "Invalid regulator name %s\n", name);
return -EINVAL;
}
- Removed unused headers.

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.

drivers/regulator/Kconfig | 9 ++
drivers/regulator/Makefile | 1 +
drivers/regulator/qcom-pm8008-regulator.c | 248 ++++++++++++++++++++++++++++++
3 files changed, 258 insertions(+)
create mode 100644 drivers/regulator/qcom-pm8008-regulator.c

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..71cb95c
--- /dev/null
+++ b/drivers/regulator/qcom-pm8008-regulator.c
@@ -0,0 +1,248 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2019-2020, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2022 Qualcomm Innovation Center, Inc. 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/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/regulator/driver.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)
+
+#define NLDO_MIN_UV 528000
+#define NLDO_MAX_UV 1504000
+
+#define PLDO_MIN_UV 1504000
+#define PLDO_MAX_UV 3400000
+
+struct pm8008_regulator_data {
+ const char *name;
+ const char *supply_name;
+ 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_assert(ARRAY_SIZE(pldo_ranges) == 1 && ARRAY_SIZE(nldo_ranges) == 1);
+
+static const struct pm8008_regulator_data reg_data[] = {
+ /* name parent headroom_uv voltage_range */
+ { "ldo1", "vdd_l1_l2", 225000, nldo_ranges, },
+ { "ldo2", "vdd_l1_l2", 225000, nldo_ranges, },
+ { "ldo3", "vdd_l3_l4", 300000, pldo_ranges, },
+ { "ldo4", "vdd_l3_l4", 300000, pldo_ranges, },
+ { "ldo5", "vdd_l5", 200000, pldo_ranges, },
+ { "ldo6", "vdd_l6", 200000, pldo_ranges, },
+ { "ldo7", "vdd_l7", 200000, pldo_ranges, },
+};
+
+static int pm8008_regulator_get_voltage(struct regulator_dev *rdev)
+{
+ struct pm8008_regulator *pm8008_reg = rdev_get_drvdata(rdev);
+ __le16 mV;
+ int rc, uV;
+
+ regmap_bulk_read(pm8008_reg->regmap,
+ LDO_VSET_LB_REG(pm8008_reg->base), (void *)&mV, 2);
+
+ uV = le16_to_cpu(mV) * 1000;
+ return (uV - pm8008_reg->rdesc.min_uV) / pm8008_reg->rdesc.uV_step;
+}
+
+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;
+
+ rc = regulator_list_voltage_linear_range(rdev, selector);
+ if (rc < 0)
+ return rc;
+
+ /* voltage control register is set with voltage in millivolts */
+ mV = DIV_ROUND_UP(rc, 1000);
+
+ rc = pm8008_write_voltage(pm8008_reg, mV);
+ if (rc < 0)
+ return rc;
+
+ pm8008_reg->voltage_selector = selector;
+
+ 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;
+
+ if (i == ARRAY_SIZE(reg_data)) {
+ dev_err(dev, "Invalid regulator name %s\n", name);
+ return -EINVAL;
+ }
+
+ 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.linear_ranges = reg_data[i].voltage_range;
+ pm8008_reg->rdesc.n_linear_ranges = 1;
+
+ if (reg_data[i].voltage_range == nldo_ranges) {
+ pm8008_reg->rdesc.min_uV = NLDO_MIN_UV;
+ pm8008_reg->rdesc.n_voltages
+ = ((NLDO_MAX_UV - NLDO_MIN_UV)
+ / pm8008_reg->rdesc.uV_step) + 1;
+ } else {
+ pm8008_reg->rdesc.min_uV = PLDO_MIN_UV;
+ pm8008_reg->rdesc.n_voltages
+ = ((PLDO_MAX_UV - PLDO_MIN_UV)
+ / pm8008_reg->rdesc.uV_step) + 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 Technologies, Inc. PM8008 PMIC Regulator Driver");
+MODULE_LICENSE("GPL");
--
2.7.4