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regulator: 88pg86x: new i2c dual regulator chip

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This chip is found on Google Chromecast and Valve Steam Link devices.
It provides two DC regulators with I2C voltage control, separate GPIO
enable pins and one sleep mode pin.

This driver does not expose GPIO functionality, but supports voltage
control in 1.0-2.2V range, based on I2C register information given in
Chromecast kernel driver by Jisheng Zhang.

Cc: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
Signed-off-by: Alexander Monakov <amonakov@ispras.ru>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Alexander Monakov 2018-03-09 01:53:03 +03:00 committed by Mark Brown
parent 2a254de29e
commit a265b03bd2
No known key found for this signature in database
GPG key ID: 24D68B725D5487D0
3 changed files with 124 additions and 0 deletions
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114
drivers/regulator/88pg86x.c Normal file
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@ -0,0 +1,114 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/of.h>
#include <linux/regulator/driver.h>
#include <linux/regmap.h>
static const struct regulator_ops pg86x_ops = {
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.list_voltage = regulator_list_voltage_linear_range,
};
static const struct regulator_linear_range pg86x_buck1_ranges[] = {
REGULATOR_LINEAR_RANGE( 0, 0, 10, 0),
REGULATOR_LINEAR_RANGE(1000000, 11, 34, 25000),
REGULATOR_LINEAR_RANGE(1600000, 35, 47, 50000),
};
static const struct regulator_linear_range pg86x_buck2_ranges[] = {
REGULATOR_LINEAR_RANGE( 0, 0, 15, 0),
REGULATOR_LINEAR_RANGE(1000000, 16, 39, 25000),
REGULATOR_LINEAR_RANGE(1600000, 40, 52, 50000),
};
static const struct regulator_desc pg86x_regulators[] = {
{
.id = 0,
.type = REGULATOR_VOLTAGE,
.name = "buck1",
.of_match = of_match_ptr("buck1"),
.n_voltages = 11 + 24 + 13,
.linear_ranges = pg86x_buck1_ranges,
.n_linear_ranges = 3,
.vsel_reg = 0x24,
.vsel_mask = 0xff,
.ops = &pg86x_ops,
.owner = THIS_MODULE
},
{
.id = 1,
.type = REGULATOR_VOLTAGE,
.name = "buck2",
.of_match = of_match_ptr("buck2"),
.n_voltages = 16 + 24 + 13,
.linear_ranges = pg86x_buck2_ranges,
.n_linear_ranges = 3,
.vsel_reg = 0x13,
.vsel_mask = 0xff,
.ops = &pg86x_ops,
.owner = THIS_MODULE
},
};
static const struct regmap_config pg86x_regmap = {
.reg_bits = 8,
.val_bits = 8,
};
static int pg86x_i2c_probe(struct i2c_client *i2c)
{
int id, ret;
struct regulator_config config = {.dev = &i2c->dev};
struct regmap *regmap = devm_regmap_init_i2c(i2c, &pg86x_regmap);
if (IS_ERR(regmap)) {
ret = PTR_ERR(regmap);
dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
return ret;
}
for (id = 0; id < ARRAY_SIZE(pg86x_regulators); id++) {
struct regulator_dev *rdev;
rdev = devm_regulator_register(&i2c->dev,
&pg86x_regulators[id],
&config);
if (IS_ERR(rdev)) {
ret = PTR_ERR(rdev);
dev_err(&i2c->dev, "failed to register %s: %d\n",
pg86x_regulators[id].name, ret);
return ret;
}
}
return 0;
}
static const struct of_device_id pg86x_dt_ids [] = {
{ .compatible = "marvell,88pg867" },
{ .compatible = "marvell,88pg868" },
{ }
};
MODULE_DEVICE_TABLE(of, pg86x_dt_ids);
static const struct i2c_device_id pg86x_i2c_id[] = {
{ "88pg867", },
{ "88pg868", },
{ }
};
MODULE_DEVICE_TABLE(i2c, pg86x_i2c_id);
static struct i2c_driver pg86x_regulator_driver = {
.driver = {
.name = "88pg86x",
.of_match_table = of_match_ptr(pg86x_dt_ids),
},
.probe_new = pg86x_i2c_probe,
.id_table = pg86x_i2c_id,
};
module_i2c_driver(pg86x_regulator_driver);
MODULE_DESCRIPTION("Marvell 88PG86X voltage regulator");
MODULE_AUTHOR("Alexander Monakov <amonakov@gmail.com>");
MODULE_LICENSE("GPL");

9
drivers/regulator/Kconfig
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@ -54,6 +54,15 @@ config REGULATOR_USERSPACE_CONSUMER
If unsure, say no.
config REGULATOR_88PG86X
tristate "Marvell 88PG86X voltage regulators"
depends on I2C
select REGMAP_I2C
help
This driver supports Marvell 88PG867 and 88PG868 voltage regulators.
They provide two I2C-controlled DC/DC step-down converters with
sleep mode and separate enable pins.
config REGULATOR_88PM800
tristate "Marvell 88PM800 Power regulators"
depends on MFD_88PM800

1
drivers/regulator/Makefile
View file

@ -10,6 +10,7 @@ obj-$(CONFIG_REGULATOR_FIXED_VOLTAGE) += fixed.o
obj-$(CONFIG_REGULATOR_VIRTUAL_CONSUMER) += virtual.o
obj-$(CONFIG_REGULATOR_USERSPACE_CONSUMER) += userspace-consumer.o
obj-$(CONFIG_REGULATOR_88PG86X) += 88pg86x.o
obj-$(CONFIG_REGULATOR_88PM800) += 88pm800.o
obj-$(CONFIG_REGULATOR_88PM8607) += 88pm8607.o
obj-$(CONFIG_REGULATOR_CPCAP) += cpcap-regulator.o