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>

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index f2881fe3e0a70ff8b28714b4042693d6ffa2b1a4..af120cbe0a3916b307b2ffdfe9ebcc2e529a776f 100644 (file)
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -556,6 +556,17 @@ 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.
+         Say M here if you want to include support for the regulator as a
+         module.
+
 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 58dfe0147cd431cd824f27624a6ac683cfb2aed2..680ef751f625543b7efe9f3ae6419a737ba12420 100644 (file)
--- 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 (file)
index 0000000..2976f9c
--- /dev/null
+++ b/drivers/regulator/max77541-regulator.c
@@ -0,0 +1,153 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2022 Analog Devices, Inc.
+ * ADI Regulator driver for the MAX77540 and MAX77541
+ */
+
+#include <linux/mfd/max77541.h>
+#include <linux/mod_devicetable.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/regulator/driver.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,
+};
+
+enum max77541_regulators {
+       MAX77541_BUCK1 = 1,
+       MAX77541_BUCK2,
+};
+
+#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 regulator_config config = {};
+       const struct regulator_desc *desc;
+       struct device *dev = &pdev->dev;
+       struct regulator_dev *rdev;
+       struct max77541 *max77541 = dev_get_drvdata(dev->parent);
+       unsigned int i;
+
+       config.dev = dev->parent;
+
+       switch (max77541->id) {
+       case MAX77540:
+               desc = max77540_regulators_desc;
+               break;
+       case MAX77541:
+               desc = max77541_regulators_desc;
+               break;
+       default:
+               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");
+       }
+
+       return 0;
+}
+
+static const struct platform_device_id max77541_regulator_platform_id[] = {
+       { "max77540-regulator" },
+       { "max77541-regulator" },
+       { }
+};
+MODULE_DEVICE_TABLE(platform, max77541_regulator_platform_id);
+
+static struct platform_driver max77541_regulator_driver = {
+       .driver = {
+               .name = "max77541-regulator",
+       },
+       .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");