[PATCH 3/5] staging: drivers: regulator: Add MAX77541 Regulator Support
From: Okan Sahin
Date: Wed Dec 07 2022 - 04:12:49 EST
This patch adds 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@xxxxxxxxxx>
---
MAINTAINERS | 1 +
drivers/regulator/Kconfig | 9 ++
drivers/regulator/Makefile | 1 +
drivers/regulator/max77541-regulator.c | 181 +++++++++++++++++++++++++
4 files changed, 192 insertions(+)
create mode 100644 drivers/regulator/max77541-regulator.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 22f5a9c490e3..5704ed5afce3 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -12503,6 +12503,7 @@ L: linux-kernel@xxxxxxxxxxxxxxx
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
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 070e4403c6c2..1e416c195af9 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -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
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 5962307e1130..c19efc7cfbef 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -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
diff --git a/drivers/regulator/max77541-regulator.c b/drivers/regulator/max77541-regulator.c
new file mode 100644
index 000000000000..9204b15f8eed
--- /dev/null
+++ b/drivers/regulator/max77541-regulator.c
@@ -0,0 +1,181 @@
+// 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)
+};
+
+struct max77541_regulator_dev {
+ struct device *dev;
+ struct max77541_dev *max77541;
+};
+
+static int max77541_regulator_probe(struct platform_device *pdev)
+{
+ struct max77541_dev *max77541 = dev_get_drvdata(pdev->dev.parent);
+ struct max77541_regulator_dev *regulator;
+ struct regulator_config config = {};
+ struct regulator_dev *rdev;
+ int i;
+
+ regulator = devm_kzalloc(&pdev->dev, sizeof(*regulator), GFP_KERNEL);
+ if (!regulator)
+ return -ENOMEM;
+
+ regulator->dev = &pdev->dev;
+ regulator->max77541 = max77541;
+
+ config.dev = pdev->dev.parent;
+ config.driver_data = regulator;
+ config.regmap = regulator->max77541->regmap;
+
+ for (i = 0; i < MAX77541_MAX_REGULATORS; i++) {
+ switch (regulator->max77541->type) {
+ case MAX77540:
+ rdev = devm_regulator_register(&pdev->dev,
+ &max77540_regulators_desc[i], &config);
+ if (IS_ERR(rdev))
+ return dev_err_probe(&pdev->dev, PTR_ERR(rdev),
+ "Failed to register regulator\n");
+ break;
+ case MAX77541:
+ rdev = devm_regulator_register(&pdev->dev,
+ &max77541_regulators_desc[i], &config);
+ if (IS_ERR(rdev))
+ return dev_err_probe(&pdev->dev, PTR_ERR(rdev),
+ "Failed to register regulator\n");
+ break;
+ default:
+ return -EINVAL;
+ }
+ }
+
+ 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@xxxxxxxxxx>");
+MODULE_DESCRIPTION("MAX77540/MAX77541 regulator driver");
+MODULE_LICENSE("GPL");
--
2.30.2