regulator: Add support for TI TPS6287x regulators

Add support for Texas Instruments TPS6287x, single-channel
synchronous step-down converters with four output voltage ranges.

Signed-off-by: Mårten Lindahl <marten.lindahl@axis.com
Link: https://lore.kernel.org/r/20230502-tps6287x-driver-v3-2-e25140a023f5@axis.com
Signed-off-by: Mark Brown <broonie@kernel.org

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index e5f3613..76918f8 100644 (file)
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -1397,6 +1397,17 @@ config REGULATOR_TPS6286X
          high-frequency synchronous step-down converters with an I2C
          interface.
 
+config REGULATOR_TPS6287X
+       tristate "TI TPS6287x Power Regulator"
+       depends on I2C && OF
+       select REGMAP_I2C
+       help
+         This driver supports TPS6287x voltage regulator chips. These are
+         pin-to-pin high-frequency synchronous step-down dc-dc converters
+         with an I2C interface.
+
+         If built as a module it will be called tps6287x-regulator.
+
 config REGULATOR_TPS65023
        tristate "TI TPS65023 Power regulators"
        depends on I2C

diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 58dfe01..0b3ad1b 100644 (file)
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -163,6 +163,7 @@ obj-$(CONFIG_REGULATOR_TI_ABB) += ti-abb-regulator.o
 obj-$(CONFIG_REGULATOR_TPS6105X) += tps6105x-regulator.o
 obj-$(CONFIG_REGULATOR_TPS62360) += tps62360-regulator.o
 obj-$(CONFIG_REGULATOR_TPS6286X) += tps6286x-regulator.o
+obj-$(CONFIG_REGULATOR_TPS6287X) += tps6287x-regulator.o
 obj-$(CONFIG_REGULATOR_TPS65023) += tps65023-regulator.o
 obj-$(CONFIG_REGULATOR_TPS6507X) += tps6507x-regulator.o
 obj-$(CONFIG_REGULATOR_TPS65086) += tps65086-regulator.o

diff --git a/drivers/regulator/tps6287x-regulator.c b/drivers/regulator/tps6287x-regulator.c
new file mode 100644 (file)
index 0000000..d7fc821
--- /dev/null
+++ b/drivers/regulator/tps6287x-regulator.c
@@ -0,0 +1,188 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2023 Axis Communications AB
+ *
+ * Driver for Texas Instruments TPS6287x PMIC.
+ * Datasheet: https://www.ti.com/lit/ds/symlink/tps62873.pdf
+ */
+
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/driver.h>
+#include <linux/bitfield.h>
+#include <linux/linear_range.h>
+
+#define TPS6287X_VSET          0x00
+#define TPS6287X_CTRL1         0x01
+#define TPS6287X_CTRL1_VRAMP   GENMASK(1, 0)
+#define TPS6287X_CTRL1_FPWMEN  BIT(4)
+#define TPS6287X_CTRL1_SWEN    BIT(5)
+#define TPS6287X_CTRL2         0x02
+#define TPS6287X_CTRL2_VRANGE  GENMASK(3, 2)
+#define TPS6287X_CTRL3         0x03
+#define TPS6287X_STATUS                0x04
+
+static const struct regmap_config tps6287x_regmap_config = {
+       .reg_bits = 8,
+       .val_bits = 8,
+       .max_register = TPS6287X_STATUS,
+};
+
+static const struct linear_range tps6287x_voltage_ranges[] = {
+       LINEAR_RANGE(400000, 0, 0xFF, 1250),
+       LINEAR_RANGE(400000, 0, 0xFF, 2500),
+       LINEAR_RANGE(400000, 0, 0xFF, 5000),
+       LINEAR_RANGE(800000, 0, 0xFF, 10000),
+};
+
+static const unsigned int tps6287x_voltage_range_sel[] = {
+       0x0, 0x4, 0x8, 0xC
+};
+
+static const unsigned int tps6287x_ramp_table[] = {
+       10000, 5000, 1250, 500
+};
+
+static int tps6287x_set_mode(struct regulator_dev *rdev, unsigned int mode)
+{
+       unsigned int val;
+
+       switch (mode) {
+       case REGULATOR_MODE_NORMAL:
+               val = 0;
+               break;
+       case REGULATOR_MODE_FAST:
+               val = TPS6287X_CTRL1_FPWMEN;
+               break;
+       default:
+               return -EINVAL;
+       }
+
+       return regmap_update_bits(rdev->regmap, TPS6287X_CTRL1,
+                                 TPS6287X_CTRL1_FPWMEN, val);
+}
+
+static unsigned int tps6287x_get_mode(struct regulator_dev *rdev)
+{
+       unsigned int val;
+       int ret;
+
+       ret = regmap_read(rdev->regmap, TPS6287X_CTRL1, &val);
+       if (ret < 0)
+               return 0;
+
+       return (val & TPS6287X_CTRL1_FPWMEN) ? REGULATOR_MODE_FAST :
+           REGULATOR_MODE_NORMAL;
+}
+
+static unsigned int tps6287x_of_map_mode(unsigned int mode)
+{
+       switch (mode) {
+       case REGULATOR_MODE_NORMAL:
+       case REGULATOR_MODE_FAST:
+               return mode;
+       default:
+               return REGULATOR_MODE_INVALID;
+       }
+}
+
+static const struct regulator_ops tps6287x_regulator_ops = {
+       .enable = regulator_enable_regmap,
+       .disable = regulator_disable_regmap,
+       .set_mode = tps6287x_set_mode,
+       .get_mode = tps6287x_get_mode,
+       .is_enabled = regulator_is_enabled_regmap,
+       .get_voltage_sel = regulator_get_voltage_sel_pickable_regmap,
+       .set_voltage_sel = regulator_set_voltage_sel_pickable_regmap,
+       .list_voltage = regulator_list_voltage_pickable_linear_range,
+       .set_ramp_delay = regulator_set_ramp_delay_regmap,
+};
+
+static struct regulator_desc tps6287x_reg = {
+       .name = "tps6287x",
+       .owner = THIS_MODULE,
+       .ops = &tps6287x_regulator_ops,
+       .of_map_mode = tps6287x_of_map_mode,
+       .type = REGULATOR_VOLTAGE,
+       .enable_reg = TPS6287X_CTRL1,
+       .enable_mask = TPS6287X_CTRL1_SWEN,
+       .vsel_reg = TPS6287X_VSET,
+       .vsel_mask = 0xFF,
+       .vsel_range_reg = TPS6287X_CTRL2,
+       .vsel_range_mask = TPS6287X_CTRL2_VRANGE,
+       .ramp_reg = TPS6287X_CTRL1,
+       .ramp_mask = TPS6287X_CTRL1_VRAMP,
+       .ramp_delay_table = tps6287x_ramp_table,
+       .n_ramp_values = ARRAY_SIZE(tps6287x_ramp_table),
+       .linear_ranges = tps6287x_voltage_ranges,
+       .n_linear_ranges = ARRAY_SIZE(tps6287x_voltage_ranges),
+       .linear_range_selectors = tps6287x_voltage_range_sel,
+};
+
+static int tps6287x_i2c_probe(struct i2c_client *i2c)
+{
+       struct device *dev = &i2c->dev;
+       struct regulator_config config = {};
+       struct regulator_dev *rdev;
+
+       config.regmap = devm_regmap_init_i2c(i2c, &tps6287x_regmap_config);
+       if (IS_ERR(config.regmap)) {
+               dev_err(dev, "Failed to init i2c\n");
+               return PTR_ERR(config.regmap);
+       }
+
+       config.dev = dev;
+       config.of_node = dev->of_node;
+       config.init_data = of_get_regulator_init_data(dev, dev->of_node,
+                                                     &tps6287x_reg);
+
+       rdev = devm_regulator_register(dev, &tps6287x_reg, &config);
+       if (IS_ERR(rdev)) {
+               dev_err(dev, "Failed to register regulator\n");
+               return PTR_ERR(rdev);
+       }
+
+       dev_dbg(dev, "Probed regulator\n");
+
+       return 0;
+}
+
+static const struct of_device_id tps6287x_dt_ids[] = {
+       { .compatible = "ti,tps62870", },
+       { .compatible = "ti,tps62871", },
+       { .compatible = "ti,tps62872", },
+       { .compatible = "ti,tps62873", },
+       { }
+};
+
+MODULE_DEVICE_TABLE(of, tps6287x_dt_ids);
+
+static const struct i2c_device_id tps6287x_i2c_id[] = {
+       { "tps62870", 0 },
+       { "tps62871", 0 },
+       { "tps62872", 0 },
+       { "tps62873", 0 },
+       {},
+};
+
+MODULE_DEVICE_TABLE(i2c, tps6287x_i2c_id);
+
+static struct i2c_driver tps6287x_regulator_driver = {
+       .driver = {
+               .name = "tps6287x",
+               .of_match_table = tps6287x_dt_ids,
+       },
+       .probe_new = tps6287x_i2c_probe,
+       .id_table = tps6287x_i2c_id,
+};
+
+module_i2c_driver(tps6287x_regulator_driver);
+
+MODULE_AUTHOR("Mårten Lindahl <marten.lindahl@axis.com>");
+MODULE_DESCRIPTION("Regulator driver for TI TPS6287X PMIC");
+MODULE_LICENSE("GPL");