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>

1 files changed, 153 insertions, 0 deletions

diff --git a/drivers/regulator/max77541-regulator.c b/drivers/regulator/max77541-regulator.c
new file mode 100644
index 000000000000..2976f9cb3e26
--- /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");