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regulator: max77541: Add ADI MAX77541/MAX77540 Regulator Support
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> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20230412111256.40013-3-okan.sahin@analog.com Signed-off-by: Lee Jones <lee@kernel.org>
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‎drivers/regulator/Kconfig‎

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@@ -556,6 +556,17 @@ config REGULATOR_MAX597X
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The MAX5970/5978 is a smart switch with no output regulation, but
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fault protection and voltage and current monitoring capabilities.
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config REGULATOR_MAX77541
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tristate "Analog Devices MAX77541/77540 Regulator"
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depends on MFD_MAX77541
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help
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This driver controls a Analog Devices MAX77541/77540 regulators
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via I2C bus. Both MAX77540 and MAX77541 are dual-phase
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high-efficiency buck converter. Say Y here to
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enable the regulator driver.
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Say M here if you want to include support for the regulator as a
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module.
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config REGULATOR_MAX77620
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tristate "Maxim 77620/MAX20024 voltage regulator"
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depends on MFD_MAX77620 || COMPILE_TEST

‎drivers/regulator/Makefile‎

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@@ -68,6 +68,7 @@ obj-$(CONFIG_REGULATOR_LTC3676) += ltc3676.o
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obj-$(CONFIG_REGULATOR_MAX14577) += max14577-regulator.o
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obj-$(CONFIG_REGULATOR_MAX1586) += max1586.o
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obj-$(CONFIG_REGULATOR_MAX597X) += max597x-regulator.o
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obj-$(CONFIG_REGULATOR_MAX77541) += max77541-regulator.o
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obj-$(CONFIG_REGULATOR_MAX77620) += max77620-regulator.o
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obj-$(CONFIG_REGULATOR_MAX77650) += max77650-regulator.o
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obj-$(CONFIG_REGULATOR_MAX8649) += max8649.o

‎drivers/regulator/max77541-regulator.c‎

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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2022 Analog Devices, Inc.
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* ADI Regulator driver for the MAX77540 and MAX77541
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*/
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#include <linux/mfd/max77541.h>
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#include <linux/mod_devicetable.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/regulator/driver.h>
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static const struct regulator_ops max77541_buck_ops = {
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.enable = regulator_enable_regmap,
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.disable = regulator_disable_regmap,
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.is_enabled = regulator_is_enabled_regmap,
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.list_voltage = regulator_list_voltage_pickable_linear_range,
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.get_voltage_sel = regulator_get_voltage_sel_pickable_regmap,
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.set_voltage_sel = regulator_set_voltage_sel_pickable_regmap,
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};
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static const struct linear_range max77540_buck_ranges[] = {
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/* Ranges when VOLT_SEL bits are 0x00 */
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REGULATOR_LINEAR_RANGE(500000, 0x00, 0x8B, 5000),
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REGULATOR_LINEAR_RANGE(1200000, 0x8C, 0xFF, 0),
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/* Ranges when VOLT_SEL bits are 0x40 */
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REGULATOR_LINEAR_RANGE(1200000, 0x00, 0x8B, 10000),
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REGULATOR_LINEAR_RANGE(2400000, 0x8C, 0xFF, 0),
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/* Ranges when VOLT_SEL bits are 0x80 */
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REGULATOR_LINEAR_RANGE(2000000, 0x00, 0x9F, 20000),
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REGULATOR_LINEAR_RANGE(5200000, 0xA0, 0xFF, 0),
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};
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static const struct linear_range max77541_buck_ranges[] = {
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/* Ranges when VOLT_SEL bits are 0x00 */
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REGULATOR_LINEAR_RANGE(300000, 0x00, 0xB3, 5000),
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REGULATOR_LINEAR_RANGE(1200000, 0xB4, 0xFF, 0),
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/* Ranges when VOLT_SEL bits are 0x40 */
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REGULATOR_LINEAR_RANGE(1200000, 0x00, 0x8B, 10000),
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REGULATOR_LINEAR_RANGE(2400000, 0x8C, 0xFF, 0),
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/* Ranges when VOLT_SEL bits are 0x80 */
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REGULATOR_LINEAR_RANGE(2000000, 0x00, 0x9F, 20000),
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REGULATOR_LINEAR_RANGE(5200000, 0xA0, 0xFF, 0),
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};
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static const unsigned int max77541_buck_volt_range_sel[] = {
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0x00, 0x00, 0x40, 0x40, 0x80, 0x80,
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};
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enum max77541_regulators {
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MAX77541_BUCK1 = 1,
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MAX77541_BUCK2,
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};
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#define MAX77540_BUCK(_id, _ops) \
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{ .id = MAX77541_BUCK ## _id, \
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.name = "buck"#_id, \
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.of_match = "buck"#_id, \
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.regulators_node = "regulators", \
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.enable_reg = MAX77541_REG_EN_CTRL, \
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.enable_mask = MAX77541_BIT_M ## _id ## _EN, \
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.ops = &(_ops), \
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.type = REGULATOR_VOLTAGE, \
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.linear_ranges = max77540_buck_ranges, \
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.n_linear_ranges = ARRAY_SIZE(max77540_buck_ranges), \
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.vsel_reg = MAX77541_REG_M ## _id ## _VOUT, \
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.vsel_mask = MAX77541_BITS_MX_VOUT, \
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.vsel_range_reg = MAX77541_REG_M ## _id ## _CFG1, \
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.vsel_range_mask = MAX77541_BITS_MX_CFG1_RNG, \
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.linear_range_selectors = max77541_buck_volt_range_sel, \
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.owner = THIS_MODULE, \
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}
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#define MAX77541_BUCK(_id, _ops) \
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{ .id = MAX77541_BUCK ## _id, \
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.name = "buck"#_id, \
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.of_match = "buck"#_id, \
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.regulators_node = "regulators", \
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.enable_reg = MAX77541_REG_EN_CTRL, \
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.enable_mask = MAX77541_BIT_M ## _id ## _EN, \
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.ops = &(_ops), \
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.type = REGULATOR_VOLTAGE, \
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.linear_ranges = max77541_buck_ranges, \
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.n_linear_ranges = ARRAY_SIZE(max77541_buck_ranges), \
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.vsel_reg = MAX77541_REG_M ## _id ## _VOUT, \
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.vsel_mask = MAX77541_BITS_MX_VOUT, \
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.vsel_range_reg = MAX77541_REG_M ## _id ## _CFG1, \
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.vsel_range_mask = MAX77541_BITS_MX_CFG1_RNG, \
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.linear_range_selectors = max77541_buck_volt_range_sel, \
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.owner = THIS_MODULE, \
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}
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static const struct regulator_desc max77540_regulators_desc[] = {
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MAX77540_BUCK(1, max77541_buck_ops),
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MAX77540_BUCK(2, max77541_buck_ops),
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};
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static const struct regulator_desc max77541_regulators_desc[] = {
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MAX77541_BUCK(1, max77541_buck_ops),
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MAX77541_BUCK(2, max77541_buck_ops),
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};
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static int max77541_regulator_probe(struct platform_device *pdev)
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{
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struct regulator_config config = {};
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const struct regulator_desc *desc;
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struct device *dev = &pdev->dev;
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struct regulator_dev *rdev;
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struct max77541 *max77541 = dev_get_drvdata(dev->parent);
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unsigned int i;
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config.dev = dev->parent;
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switch (max77541->id) {
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case MAX77540:
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desc = max77540_regulators_desc;
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break;
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case MAX77541:
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desc = max77541_regulators_desc;
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break;
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default:
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return -EINVAL;
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}
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for (i = 0; i < MAX77541_MAX_REGULATORS; i++) {
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rdev = devm_regulator_register(dev, &desc[i], &config);
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if (IS_ERR(rdev))
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return dev_err_probe(dev, PTR_ERR(rdev),
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"Failed to register regulator\n");
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}
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return 0;
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}
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static const struct platform_device_id max77541_regulator_platform_id[] = {
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{ "max77540-regulator" },
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{ "max77541-regulator" },
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{ }
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};
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MODULE_DEVICE_TABLE(platform, max77541_regulator_platform_id);
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static struct platform_driver max77541_regulator_driver = {
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.driver = {
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.name = "max77541-regulator",
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},
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.probe = max77541_regulator_probe,
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.id_table = max77541_regulator_platform_id,
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};
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module_platform_driver(max77541_regulator_driver);
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MODULE_AUTHOR("Okan Sahin <Okan.Sahin@analog.com>");
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MODULE_DESCRIPTION("MAX77540/MAX77541 regulator driver");
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MODULE_LICENSE("GPL");

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