regulator: fan53880: Add initial support

This patch adds support for ON Semiconductor FAN53880 regulator.

The FAN53880 is an I2C porgrammable power management IC (PMIC)
that contains a BUCK (step-down converter), four LDOs (low dropouts)
and one BOOST (step-up converter).  It is designed for mobile power
applications.

Signed-off-by: Christoph Fritz <chf.fritz@googlemail.com>
Link: https://lore.kernel.org/r/20200702210846.31659-2-chf.fritz@googlemail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index faa4cbfdc5d0c3257423daf8a9929d09bfd94c9a..2c6a8c4bdf06f49c1c646ef6650414fcef56693d 100644 (file)
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -336,6 +336,16 @@ config REGULATOR_FAN53555
          input voltage supply of 2.5V to 5.5V. The output voltage is
          programmed through an I2C interface.
 
+config REGULATOR_FAN53880
+       tristate "Fairchild FAN53880 Regulator"
+       depends on I2C
+       select REGMAP_I2C
+       help
+         This driver supports Fairchild (ON Semiconductor) FAN53880
+         regulator. The regulator is a programmable power management IC
+         (PMIC), it is controlled by I2C and provides one BUCK, one BOOST
+         and four LDO outputs.
+
 config REGULATOR_GPIO
        tristate "GPIO regulator support"
        depends on GPIOLIB || COMPILE_TEST

diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index a20670a1eab002d9a80f076b1cbf50e0317d5c9b..85bc3ef0be1c79315bf05b539cddbfb2002bc8c1 100644 (file)
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -42,6 +42,7 @@ obj-$(CONFIG_REGULATOR_DA9211) += da9211-regulator.o
 obj-$(CONFIG_REGULATOR_DBX500_PRCMU) += dbx500-prcmu.o
 obj-$(CONFIG_REGULATOR_DB8500_PRCMU) += db8500-prcmu.o
 obj-$(CONFIG_REGULATOR_FAN53555) += fan53555.o
+obj-$(CONFIG_REGULATOR_FAN53880) += fan53880.o
 obj-$(CONFIG_REGULATOR_GPIO) += gpio-regulator.o
 obj-$(CONFIG_REGULATOR_HI6421) += hi6421-regulator.o
 obj-$(CONFIG_REGULATOR_HI6421V530) += hi6421v530-regulator.o

diff --git a/drivers/regulator/fan53880.c b/drivers/regulator/fan53880.c
new file mode 100644 (file)
index 0000000..285acc7
--- /dev/null
+++ b/drivers/regulator/fan53880.c
@@ -0,0 +1,179 @@
+// SPDX-License-Identifier: GPL-2.0+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/regmap.h>
+#include <linux/regulator/driver.h>
+
+enum fan53880_regulator_ids {
+       FAN53880_LDO1,
+       FAN53880_LDO2,
+       FAN53880_LDO3,
+       FAN53880_LDO4,
+       FAN53880_BUCK,
+       FAN53880_BOOST,
+};
+
+enum fan53880_registers {
+       FAN53880_PRODUCT_ID = 0x00,
+       FAN53880_SILICON_REV,
+       FAN53880_BUCKVOUT,
+       FAN53880_BOOSTVOUT,
+       FAN53880_LDO1VOUT,
+       FAN53880_LDO2VOUT,
+       FAN53880_LDO3VOUT,
+       FAN53880_LDO4VOUT,
+       FAN53880_IOUT,
+       FAN53880_ENABLE,
+       FAN53880_ENABLE_BOOST,
+};
+
+#define FAN53880_ID    0x01
+
+static const struct regulator_ops fan53880_ops = {
+       .list_voltage = regulator_list_voltage_linear_range,
+       .map_voltage = regulator_map_voltage_linear_range,
+       .set_voltage_sel = regulator_set_voltage_sel_regmap,
+       .get_voltage_sel = regulator_get_voltage_sel_regmap,
+       .enable = regulator_enable_regmap,
+       .disable = regulator_disable_regmap,
+       .is_enabled = regulator_is_enabled_regmap,
+};
+
+#define FAN53880_LDO(_num, _supply, _default)                          \
+       [FAN53880_LDO ## _num] = {                                      \
+               .name =            "LDO"#_num,                          \
+               .of_match =        of_match_ptr("LDO"#_num),            \
+               .regulators_node = of_match_ptr("regulators"),          \
+               .type =            REGULATOR_VOLTAGE,                   \
+               .linear_ranges =   (struct linear_range[]) {            \
+                     REGULATOR_LINEAR_RANGE(_default, 0x0, 0x0, 0),    \
+                     REGULATOR_LINEAR_RANGE(800000, 0xf, 0x73, 25000), \
+               },                                                      \
+               .n_linear_ranges = 2,                                   \
+               .vsel_reg =        FAN53880_LDO ## _num ## VOUT,        \
+               .vsel_mask =       0x7f,                                \
+               .enable_reg =      FAN53880_ENABLE,                     \
+               .enable_mask =     BIT(_num - 1),                       \
+               .enable_time =     150,                                 \
+               .supply_name =     _supply,                             \
+               .ops =             &fan53880_ops,                       \
+       }
+
+static const struct regulator_desc fan53880_regulators[] = {
+       FAN53880_LDO(1, "VIN12", 2800000),
+       FAN53880_LDO(2, "VIN12", 2800000),
+       FAN53880_LDO(3, "VIN3", 1800000),
+       FAN53880_LDO(4, "VIN4", 1800000),
+       [FAN53880_BUCK] = {
+               .name =            "BUCK",
+               .of_match =        of_match_ptr("BUCK"),
+               .regulators_node = of_match_ptr("regulators"),
+               .type =            REGULATOR_VOLTAGE,
+               .linear_ranges =   (struct linear_range[]) {
+                     REGULATOR_LINEAR_RANGE(1100000, 0x0, 0x0, 0),
+                     REGULATOR_LINEAR_RANGE(600000, 0x1f, 0xf7, 12500),
+               },
+               .n_linear_ranges = 2,
+               .vsel_reg =        FAN53880_BUCKVOUT,
+               .vsel_mask =       0x7f,
+               .enable_reg =      FAN53880_ENABLE,
+               .enable_mask =     0x10,
+               .enable_time =     480,
+               .supply_name =     "PVIN",
+               .ops =             &fan53880_ops,
+       },
+       [FAN53880_BOOST] = {
+               .name =            "BOOST",
+               .of_match =        of_match_ptr("BOOST"),
+               .regulators_node = of_match_ptr("regulators"),
+               .type =            REGULATOR_VOLTAGE,
+               .linear_ranges =   (struct linear_range[]) {
+                     REGULATOR_LINEAR_RANGE(5000000, 0x0, 0x0, 0),
+                     REGULATOR_LINEAR_RANGE(3000000, 0x4, 0x70, 25000),
+               },
+               .n_linear_ranges = 2,
+               .vsel_reg =        FAN53880_BOOSTVOUT,
+               .vsel_mask =       0x7f,
+               .enable_reg =      FAN53880_ENABLE_BOOST,
+               .enable_mask =     0xff,
+               .enable_time =     580,
+               .supply_name =     "PVIN",
+               .ops =             &fan53880_ops,
+       },
+};
+
+static const struct regmap_config fan53880_regmap = {
+       .reg_bits = 8,
+       .val_bits = 8,
+       .max_register = FAN53880_ENABLE_BOOST,
+};
+
+static int fan53880_i2c_probe(struct i2c_client *i2c,
+                            const struct i2c_device_id *id)
+{
+       struct regulator_config config = { };
+       struct regulator_dev *rdev;
+       struct regmap *regmap;
+       int i, ret;
+       unsigned int data;
+
+       regmap = devm_regmap_init_i2c(i2c, &fan53880_regmap);
+       if (IS_ERR(regmap)) {
+               ret = PTR_ERR(regmap);
+               dev_err(&i2c->dev, "Failed to create regmap: %d\n", ret);
+               return ret;
+       }
+
+       ret = regmap_read(regmap, FAN53880_PRODUCT_ID, &data);
+       if (ret < 0) {
+               dev_err(&i2c->dev, "Failed to read PRODUCT_ID: %d\n", ret);
+               return ret;
+       }
+       if (data != FAN53880_ID) {
+               dev_err(&i2c->dev, "Unsupported device id: 0x%x.\n", data);
+               return -ENODEV;
+       }
+
+       config.dev = &i2c->dev;
+       config.init_data = NULL;
+
+       for (i = 0; i < ARRAY_SIZE(fan53880_regulators); i++) {
+               rdev = devm_regulator_register(&i2c->dev,
+                                              &fan53880_regulators[i],
+                                              &config);
+               if (IS_ERR(rdev)) {
+                       ret = PTR_ERR(rdev);
+                       dev_err(&i2c->dev, "Failed to register %s: %d\n",
+                               fan53880_regulators[i].name, ret);
+                       return ret;
+               }
+       }
+
+       return 0;
+}
+
+static const struct of_device_id fan53880_dt_ids[] = {
+       { .compatible = "onnn,fan53880", },
+       {}
+};
+MODULE_DEVICE_TABLE(of, fan53880_dt_ids);
+
+static const struct i2c_device_id fan53880_i2c_id[] = {
+       { "fan53880", },
+       {}
+};
+MODULE_DEVICE_TABLE(i2c, fan53880_i2c_id);
+
+static struct i2c_driver fan53880_regulator_driver = {
+       .driver = {
+               .name = "fan53880",
+               .of_match_table = of_match_ptr(fan53880_dt_ids),
+       },
+       .probe = fan53880_i2c_probe,
+       .id_table = fan53880_i2c_id,
+};
+module_i2c_driver(fan53880_regulator_driver);
+
+MODULE_DESCRIPTION("FAN53880 PMIC voltage regulator driver");
+MODULE_AUTHOR("Christoph Fritz <chf.fritz@googlemail.com>");
+MODULE_LICENSE("GPL");