Commit 97be8288 authored by Jisheng Zhang's avatar Jisheng Zhang Committed by Mark Brown

regulator: add support for MP8869 regulator

The MP8869 from Monolithic Power Systems is a single output DC/DC
converter. The voltage can be controlled via I2C.
Signed-off-by: default avatarJisheng Zhang <Jisheng.Zhang@synaptics.com>
Link: https://lore.kernel.org/r/20200316223020.1a6d92ae@xhackerSigned-off-by: default avatarMark Brown <broonie@kernel.org>
parent 2473115c
......@@ -635,6 +635,13 @@ config REGULATOR_MP8859
Say M here if you want to include support for the regulator as a
module. The module will be named "mp8859".
config REGULATOR_MP886X
tristate "MPS MP8869 regulator driver"
depends on I2C && (OF || COMPILE_TEST)
select REGMAP_I2C
help
This driver supports the MP8869 voltage regulator.
config REGULATOR_MPQ7920
tristate "Monolithic MPQ7920 PMIC"
depends on I2C && OF
......
......@@ -80,6 +80,7 @@ obj-$(CONFIG_REGULATOR_MC13XXX_CORE) += mc13xxx-regulator-core.o
obj-$(CONFIG_REGULATOR_MCP16502) += mcp16502.o
obj-$(CONFIG_REGULATOR_MP5416) += mp5416.o
obj-$(CONFIG_REGULATOR_MP8859) += mp8859.o
obj-$(CONFIG_REGULATOR_MP886X) += mp886x.o
obj-$(CONFIG_REGULATOR_MPQ7920) += mpq7920.o
obj-$(CONFIG_REGULATOR_MT6311) += mt6311-regulator.o
obj-$(CONFIG_REGULATOR_MT6323) += mt6323-regulator.o
......
// SPDX-License-Identifier: GPL-2.0
//
// MP8869 regulator driver
//
// Copyright (C) 2020 Synaptics Incorporated
//
// Author: Jisheng Zhang <jszhang@kernel.org>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>
#define MP886X_VSEL 0x00
#define MP886X_V_BOOT (1 << 7)
#define MP886X_SYSCNTLREG1 0x01
#define MP886X_MODE (1 << 0)
#define MP886X_GO (1 << 6)
#define MP886X_EN (1 << 7)
struct mp886x_device_info {
struct device *dev;
struct regulator_desc desc;
struct regulator_init_data *regulator;
struct gpio_desc *en_gpio;
u32 r[2];
unsigned int sel;
};
static int mp886x_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
switch (mode) {
case REGULATOR_MODE_FAST:
regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
MP886X_MODE, MP886X_MODE);
break;
case REGULATOR_MODE_NORMAL:
regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
MP886X_MODE, 0);
break;
default:
return -EINVAL;
}
return 0;
}
static unsigned int mp886x_get_mode(struct regulator_dev *rdev)
{
u32 val;
int ret;
ret = regmap_read(rdev->regmap, MP886X_SYSCNTLREG1, &val);
if (ret < 0)
return ret;
if (val & MP886X_MODE)
return REGULATOR_MODE_FAST;
else
return REGULATOR_MODE_NORMAL;
}
static int mp8869_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel)
{
int ret;
ret = regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
MP886X_GO, MP886X_GO);
if (ret < 0)
return ret;
sel <<= ffs(rdev->desc->vsel_mask) - 1;
return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
MP886X_V_BOOT | rdev->desc->vsel_mask, sel);
}
static inline unsigned int mp8869_scale(unsigned int uv, u32 r1, u32 r2)
{
u32 tmp = uv * r1 / r2;
return uv + tmp;
}
static int mp8869_get_voltage_sel(struct regulator_dev *rdev)
{
struct mp886x_device_info *di = rdev_get_drvdata(rdev);
int ret, uv;
unsigned int val;
bool fbloop;
ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
if (ret)
return ret;
fbloop = val & MP886X_V_BOOT;
if (fbloop) {
uv = rdev->desc->min_uV;
uv = mp8869_scale(uv, di->r[0], di->r[1]);
return regulator_map_voltage_linear(rdev, uv, uv);
}
val &= rdev->desc->vsel_mask;
val >>= ffs(rdev->desc->vsel_mask) - 1;
return val;
}
static const struct regulator_ops mp8869_regulator_ops = {
.set_voltage_sel = mp8869_set_voltage_sel,
.get_voltage_sel = mp8869_get_voltage_sel,
.set_voltage_time_sel = regulator_set_voltage_time_sel,
.map_voltage = regulator_map_voltage_linear,
.list_voltage = regulator_list_voltage_linear,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.set_mode = mp886x_set_mode,
.get_mode = mp886x_get_mode,
};
static int mp886x_regulator_register(struct mp886x_device_info *di,
struct regulator_config *config)
{
struct regulator_desc *rdesc = &di->desc;
struct regulator_dev *rdev;
rdesc->name = "mp886x-reg";
rdesc->supply_name = "vin";
rdesc->ops = of_device_get_match_data(di->dev);
rdesc->type = REGULATOR_VOLTAGE;
rdesc->n_voltages = 128;
rdesc->enable_reg = MP886X_SYSCNTLREG1;
rdesc->enable_mask = MP886X_EN;
rdesc->min_uV = 600000;
rdesc->uV_step = 10000;
rdesc->vsel_reg = MP886X_VSEL;
rdesc->vsel_mask = 0x3f;
rdesc->owner = THIS_MODULE;
rdev = devm_regulator_register(di->dev, &di->desc, config);
if (IS_ERR(rdev))
return PTR_ERR(rdev);
di->sel = rdesc->ops->get_voltage_sel(rdev);
return 0;
}
static const struct regmap_config mp886x_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
};
static int mp886x_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct device *dev = &client->dev;
struct device_node *np = dev->of_node;
struct mp886x_device_info *di;
struct regulator_config config = { };
struct regmap *regmap;
int ret;
di = devm_kzalloc(dev, sizeof(struct mp886x_device_info), GFP_KERNEL);
if (!di)
return -ENOMEM;
di->regulator = of_get_regulator_init_data(dev, np, &di->desc);
if (!di->regulator) {
dev_err(dev, "Platform data not found!\n");
return -EINVAL;
}
ret = of_property_read_u32_array(np, "mps,fb-voltage-divider",
di->r, 2);
if (ret)
return ret;
di->en_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_HIGH);
if (IS_ERR(di->en_gpio))
return PTR_ERR(di->en_gpio);
di->dev = dev;
regmap = devm_regmap_init_i2c(client, &mp886x_regmap_config);
if (IS_ERR(regmap)) {
dev_err(dev, "Failed to allocate regmap!\n");
return PTR_ERR(regmap);
}
i2c_set_clientdata(client, di);
config.dev = di->dev;
config.init_data = di->regulator;
config.regmap = regmap;
config.driver_data = di;
config.of_node = np;
ret = mp886x_regulator_register(di, &config);
if (ret < 0)
dev_err(dev, "Failed to register regulator!\n");
return ret;
}
static const struct of_device_id mp886x_dt_ids[] = {
{
.compatible = "mps,mp8869",
.data = &mp8869_regulator_ops
},
{ }
};
MODULE_DEVICE_TABLE(of, mp886x_dt_ids);
static const struct i2c_device_id mp886x_id[] = {
{ "mp886x", },
{ },
};
MODULE_DEVICE_TABLE(i2c, mp886x_id);
static struct i2c_driver mp886x_regulator_driver = {
.driver = {
.name = "mp886x-regulator",
.of_match_table = of_match_ptr(mp886x_dt_ids),
},
.probe = mp886x_i2c_probe,
.id_table = mp886x_id,
};
module_i2c_driver(mp886x_regulator_driver);
MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>");
MODULE_DESCRIPTION("MP886x regulator driver");
MODULE_LICENSE("GPL v2");
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