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drivers: regulator: Add MAX77541 Regulator Support
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Regulator driver for both MAX77541 and MAX77540.
The MAX77541 is a high-efficiency step-down converter
with two 3A switching phases for single-cell Li+ battery
and 5VDC systems.

The MAX77540 is a high-efficiency step-down converter
with two 3A switching phases.

Signed-off-by: Okan Sahin <okan.sahin@analog.com>
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@oknshn @intel-lab-lkp
oknshn authored and intel-lab-lkp committed Dec 26, 2022
1 parent 94fea23 commit f2fbe0a
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1 change: 1 addition & 0 deletions MAINTAINERS
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Expand Up @@ -12503,6 +12503,7 @@ L: linux-kernel@vger.kernel.org
S: Maintained
F: Documentation/devicetree/bindings/mfd/adi,max77541.yaml
F: drivers/mfd/max77541.c
F: drivers/regulator/max77541-regulator.c
F: include/linux/mfd/max77541.h

MAXIM MAX77650 PMIC MFD DRIVER
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9 changes: 9 additions & 0 deletions drivers/regulator/Kconfig
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Expand Up @@ -556,6 +556,15 @@ config REGULATOR_MAX597X
The MAX5970/5978 is a smart switch with no output regulation, but
fault protection and voltage and current monitoring capabilities.

config REGULATOR_MAX77541
tristate "Analog Devices MAX77541/77540 Regulator"
depends on MFD_MAX77541
help
This driver controls a Analog Devices MAX77541/77540 regulators
via I2C bus. Both MAX77540 and MAX77541 are dual-phase
high-efficiency buck converter. Say Y here to
enable the regulator driver.

config REGULATOR_MAX77620
tristate "Maxim 77620/MAX20024 voltage regulator"
depends on MFD_MAX77620 || COMPILE_TEST
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1 change: 1 addition & 0 deletions drivers/regulator/Makefile
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Expand Up @@ -68,6 +68,7 @@ obj-$(CONFIG_REGULATOR_LTC3676) += ltc3676.o
obj-$(CONFIG_REGULATOR_MAX14577) += max14577-regulator.o
obj-$(CONFIG_REGULATOR_MAX1586) += max1586.o
obj-$(CONFIG_REGULATOR_MAX597X) += max597x-regulator.o
obj-$(CONFIG_REGULATOR_MAX77541) += max77541-regulator.o
obj-$(CONFIG_REGULATOR_MAX77620) += max77620-regulator.o
obj-$(CONFIG_REGULATOR_MAX77650) += max77650-regulator.o
obj-$(CONFIG_REGULATOR_MAX8649) += max8649.o
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161 changes: 161 additions & 0 deletions drivers/regulator/max77541-regulator.c
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@@ -0,0 +1,161 @@
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2022 Analog Devices, Inc.
* ADI Regulator driver for the MAX77540 and MAX77541
*/

#include <linux/i2c.h>
#include <linux/mfd/max77541.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>

static const struct regulator_ops max77541_buck_ops = {
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.list_voltage = regulator_list_voltage_pickable_linear_range,
.get_voltage_sel = regulator_get_voltage_sel_pickable_regmap,
.set_voltage_sel = regulator_set_voltage_sel_pickable_regmap,
};

static const struct linear_range max77540_buck_ranges[] = {
/* Ranges when VOLT_SEL bits are 0x00 */
REGULATOR_LINEAR_RANGE(500000, 0x00, 0x8B, 5000),
REGULATOR_LINEAR_RANGE(1200000, 0x8C, 0xFF, 0),
/* Ranges when VOLT_SEL bits are 0x40 */
REGULATOR_LINEAR_RANGE(1200000, 0x00, 0x8B, 10000),
REGULATOR_LINEAR_RANGE(2400000, 0x8C, 0xFF, 0),
/* Ranges when VOLT_SEL bits are 0x80 */
REGULATOR_LINEAR_RANGE(2000000, 0x00, 0x9F, 20000),
REGULATOR_LINEAR_RANGE(5200000, 0xA0, 0xFF, 0),
};

static const struct linear_range max77541_buck_ranges[] = {
/* Ranges when VOLT_SEL bits are 0x00 */
REGULATOR_LINEAR_RANGE(300000, 0x00, 0xB3, 5000),
REGULATOR_LINEAR_RANGE(1200000, 0xB4, 0xFF, 0),
/* Ranges when VOLT_SEL bits are 0x40 */
REGULATOR_LINEAR_RANGE(1200000, 0x00, 0x8B, 10000),
REGULATOR_LINEAR_RANGE(2400000, 0x8C, 0xFF, 0),
/* Ranges when VOLT_SEL bits are 0x80 */
REGULATOR_LINEAR_RANGE(2000000, 0x00, 0x9F, 20000),
REGULATOR_LINEAR_RANGE(5200000, 0xA0, 0xFF, 0),
};

static const unsigned int max77541_buck_volt_range_sel[] = {
0x00, 0x00, 0x40, 0x40, 0x80, 0x80,
};

#define MAX77540_BUCK(_id, _ops) \
{ .id = MAX77541_BUCK ## _id, \
.name = "BUCK"#_id, \
.of_match = "BUCK"#_id, \
.regulators_node = "regulators", \
.enable_reg = MAX77541_REG_EN_CTRL, \
.enable_mask = MAX77541_BIT_M ## _id ## _EN, \
.ops = &(_ops), \
.type = REGULATOR_VOLTAGE, \
.linear_ranges = max77540_buck_ranges, \
.n_linear_ranges = ARRAY_SIZE(max77540_buck_ranges), \
.vsel_reg = MAX77541_REG_M ## _id ## _VOUT, \
.vsel_mask = MAX77541_BITS_MX_VOUT, \
.vsel_range_reg = MAX77541_REG_M ## _id ## _CFG1, \
.vsel_range_mask = MAX77541_BITS_MX_CFG1_RNG, \
.linear_range_selectors = max77541_buck_volt_range_sel, \
.owner = THIS_MODULE, \
}

#define MAX77541_BUCK(_id, _ops) \
{ .id = MAX77541_BUCK ## _id, \
.name = "BUCK"#_id, \
.of_match = "BUCK"#_id, \
.regulators_node = "regulators", \
.enable_reg = MAX77541_REG_EN_CTRL, \
.enable_mask = MAX77541_BIT_M ## _id ## _EN, \
.ops = &(_ops), \
.type = REGULATOR_VOLTAGE, \
.linear_ranges = max77541_buck_ranges, \
.n_linear_ranges = ARRAY_SIZE(max77541_buck_ranges), \
.vsel_reg = MAX77541_REG_M ## _id ## _VOUT, \
.vsel_mask = MAX77541_BITS_MX_VOUT, \
.vsel_range_reg = MAX77541_REG_M ## _id ## _CFG1, \
.vsel_range_mask = MAX77541_BITS_MX_CFG1_RNG, \
.linear_range_selectors = max77541_buck_volt_range_sel, \
.owner = THIS_MODULE, \
}

static const struct regulator_desc max77540_regulators_desc[] = {
MAX77540_BUCK(1, max77541_buck_ops),
MAX77540_BUCK(2, max77541_buck_ops),
};

static const struct regulator_desc max77541_regulators_desc[] = {
MAX77541_BUCK(1, max77541_buck_ops),
MAX77541_BUCK(2, max77541_buck_ops),
};

static int max77541_regulator_probe(struct platform_device *pdev)
{
struct max77541_dev *max77541 = dev_get_drvdata(pdev->dev.parent);
struct regulator_config config = {};
const struct regulator_desc *desc;
struct device *dev = &pdev->dev;
struct regulator_dev *rdev;
int i;

config.dev = pdev->dev.parent;

if (max77541->id == MAX77540)
desc = max77540_regulators_desc;
else if (max77541->id == MAX77541)
desc = max77541_regulators_desc;
else
return -EINVAL;

for (i = 0; i < MAX77541_MAX_REGULATORS; i++) {
rdev = devm_regulator_register(dev,
&desc[i], &config);
if (IS_ERR(rdev))
return dev_err_probe(dev, PTR_ERR(rdev),
"Failed to register regulator\n");
break;
}

return 0;
}

static const struct platform_device_id max77541_regulator_platform_id[] = {
{ "max77540-regulator", MAX77540 },
{ "max77541-regulator", MAX77541 },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, max77541_regulator_platform_id);

static const struct of_device_id max77541_regulator_of_id[] = {
{
.compatible = "adi,max77540-regulator",
.data = (void *)MAX77540,
},
{
.compatible = "adi,max77541-regulator",
.data = (void *)MAX77541,
},
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, max77541_regulator_of_id);

static struct platform_driver max77541_regulator_driver = {
.driver = {
.name = "max77541-regulator",
.of_match_table = max77541_regulator_of_id,
},
.probe = max77541_regulator_probe,
.id_table = max77541_regulator_platform_id,
};
module_platform_driver(max77541_regulator_driver);

MODULE_AUTHOR("Okan Sahin <Okan.Sahin@analog.com>");
MODULE_DESCRIPTION("MAX77540/MAX77541 regulator driver");
MODULE_LICENSE("GPL");

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