Date:   Tue, 11 Jul 2023 19:27:48 +0300
From:   Okan Sahin <okan.sahin@...log.com>
To:     <okan.sahin@...log.com>
CC:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        "Rob Herring" <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Ibrahim Tilki <Ibrahim.Tilki@...log.com>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: [PATCH v2 2/2] regulator: max77857: Add ADI MAX77857/59/MAX77831 Regulator Support

Regulator driver for  MAX77857/59 and MAX77831.
The MAX77857 is a high-efficiency, high-performance
buck-boost converter targeted for systems requiring
a wide input voltage range (2.5V to 16V).

The MAX77859 is high-Efficiency Buck-Boost Converter
for USB-PD/PPS Applications. It has wide input range
(2.5V to 22V)

The MAX77831 is a high-efficiency, high-performance
buck-boost converter targeted for systems requiring
wide input voltage range (2.5V to 16V).

Signed-off-by: Okan Sahin <okan.sahin@...log.com>
---
 drivers/regulator/Kconfig              |  10 +
 drivers/regulator/Makefile             |   1 +
 drivers/regulator/max77857-regulator.c | 459 +++++++++++++++++++++++++
 3 files changed, 470 insertions(+)
 create mode 100644 drivers/regulator/max77857-regulator.c

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index e5f3613c15fa..09eaa1cd90de 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -573,6 +573,16 @@ config REGULATOR_MAX77650
 	  Semiconductor. This device has a SIMO with three independent
 	  power rails and an LDO.
 
+config REGULATOR_MAX77857
+	tristate "ADI MAX77857/MAX77831 regulator support"
+	depends on I2C
+	select REGMAP_I2C
+	help
+	  This driver controls a ADI MAX77857 and MAX77831 regulators.
+	  via I2C bus. MAX77857 and MAX77831 are high efficiency buck-boost
+	  converters with input voltage range (2.5V to 16V). Say Y here to
+	  enable the regulator driver
+
 config REGULATOR_MAX8649
 	tristate "Maxim 8649 voltage regulator"
 	depends on I2C
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 58dfe0147cd4..e7230846b680 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -85,6 +85,7 @@ obj-$(CONFIG_REGULATOR_MAX77686) += max77686-regulator.o
 obj-$(CONFIG_REGULATOR_MAX77693) += max77693-regulator.o
 obj-$(CONFIG_REGULATOR_MAX77802) += max77802-regulator.o
 obj-$(CONFIG_REGULATOR_MAX77826) += max77826-regulator.o
+obj-$(CONFIG_REGULATOR_MAX77857) += max77857-regulator.o
 obj-$(CONFIG_REGULATOR_MC13783) += mc13783-regulator.o
 obj-$(CONFIG_REGULATOR_MC13892) += mc13892-regulator.o
 obj-$(CONFIG_REGULATOR_MC13XXX_CORE) +=  mc13xxx-regulator-core.o
diff --git a/drivers/regulator/max77857-regulator.c b/drivers/regulator/max77857-regulator.c
new file mode 100644
index 000000000000..9a566e2d73b4
--- /dev/null
+++ b/drivers/regulator/max77857-regulator.c
@@ -0,0 +1,459 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2023 Analog Devices, Inc.
+ * ADI Regulator driver for the MAX77857
+ * MAX77859 and MAX77831.
+ */
+#include <linux/bitfield.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/util_macros.h>
+
+#define MAX77857_REG_INT_SRC		0x10
+#define MAX77857_REG_INT_MASK		0x11
+#define MAX77857_REG_CONT1		0x12
+#define MAX77857_REG_CONT2		0x13
+#define MAX77857_REG_CONT3		0x14
+
+#define MAX77857_INT_SRC_OCP		BIT(0)
+#define MAX77857_INT_SRC_THS		BIT(1)
+#define MAX77857_INT_SRC_HARDSHORT	BIT(2)
+#define MAX77857_INT_SRC_OVP		BIT(3)
+#define MAX77857_INT_SRC_POK		BIT(4)
+
+#define MAX77857_ILIM_MASK		GENMASK(2, 0)
+#define MAX77857_CONT1_FREQ		GENMASK(4, 3)
+#define MAX77857_CONT3_FPWM		BIT(5)
+
+#define MAX77859_REG_INT_SRC		0x11
+#define MAX77859_REG_CONT1		0x13
+#define MAX77859_REG_CONT2		0x14
+#define MAX77859_REG_CONT3		0x15
+#define MAX77859_REG_CONT5		0x17
+#define MAX77859_CONT2_FPWM		BIT(2)
+#define MAX77859_CONT2_INTB		BIT(3)
+#define MAX77859_CONT3_DVS_START	BIT(2)
+#define MAX77859_VOLTAGE_SEL_MASK	GENMASK(9, 0)
+
+#define MAX77859_CURRENT_MIN		1000000
+#define MAX77859_CURRENT_MAX		5000000
+#define MAX77859_CURRENT_STEP		50000
+
+enum max77857_id {
+	ID_MAX77831 = 1,
+	ID_MAX77857,
+	ID_MAX77859,
+	ID_MAX77859A,
+};
+
+static bool max77857_volatile_reg(struct device *dev, unsigned int reg)
+{
+	enum max77857_id id = (enum max77857_id)dev_get_drvdata(dev);
+
+	switch (id) {
+	case ID_MAX77831:
+	case ID_MAX77857:
+		return reg == MAX77857_REG_INT_SRC;
+	case ID_MAX77859:
+	case ID_MAX77859A:
+		return reg == MAX77859_REG_INT_SRC;
+	default:
+		return true;
+	}
+}
+
+struct regmap_config max77857_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.cache_type = REGCACHE_RBTREE,
+	.volatile_reg = max77857_volatile_reg,
+};
+
+static int max77857_get_status(struct regulator_dev *rdev)
+{
+	unsigned int val;
+	int ret;
+
+	ret = regmap_read(rdev->regmap, MAX77857_REG_INT_SRC, &val);
+	if (ret)
+		return ret;
+
+	if (FIELD_GET(MAX77857_INT_SRC_POK, val))
+		return REGULATOR_STATUS_ON;
+
+	return REGULATOR_STATUS_ERROR;
+}
+
+static unsigned int max77857_get_mode(struct regulator_dev *rdev)
+{
+	enum max77857_id id = (enum max77857_id)rdev_get_drvdata(rdev);
+	unsigned int regval;
+	int ret;
+
+	switch (id) {
+	case ID_MAX77831:
+	case ID_MAX77857:
+		ret = regmap_read(rdev->regmap, MAX77857_REG_CONT3, &regval);
+		if (ret)
+			return ret;
+
+		if (FIELD_GET(MAX77857_CONT3_FPWM, regval))
+			return REGULATOR_MODE_FAST;
+
+		break;
+	case ID_MAX77859:
+	case ID_MAX77859A:
+		ret = regmap_read(rdev->regmap, MAX77859_REG_CONT2, &regval);
+		if (ret)
+			return ret;
+
+		if (FIELD_GET(MAX77859_CONT2_FPWM, regval))
+			return REGULATOR_MODE_FAST;
+
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return REGULATOR_MODE_NORMAL;
+}
+
+static int max77857_set_mode(struct regulator_dev *rdev, unsigned int mode)
+{
+	enum max77857_id id = (enum max77857_id)rdev_get_drvdata(rdev);
+	unsigned int reg, val;
+
+	switch (id) {
+	case ID_MAX77831:
+	case ID_MAX77857:
+		reg = MAX77857_REG_CONT3;
+		val = MAX77857_CONT3_FPWM;
+		break;
+	case ID_MAX77859:
+	case ID_MAX77859A:
+		reg = MAX77859_REG_CONT2;
+		val = MAX77859_CONT2_FPWM;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	switch (mode) {
+	case REGULATOR_MODE_FAST:
+		return regmap_set_bits(rdev->regmap, reg, val);
+	case REGULATOR_MODE_NORMAL:
+		return regmap_clear_bits(rdev->regmap, reg, val);
+	default:
+		return -EINVAL;
+	}
+}
+
+static int max77857_get_error_flags(struct regulator_dev *rdev,
+				    unsigned int *flags)
+{
+	unsigned int val;
+	int ret;
+
+	ret = regmap_read(rdev->regmap, MAX77857_REG_INT_SRC, &val);
+	if (ret)
+		return ret;
+
+	*flags = 0;
+
+	if (FIELD_GET(MAX77857_INT_SRC_OVP, val))
+		*flags |= REGULATOR_ERROR_OVER_VOLTAGE_WARN;
+
+	if (FIELD_GET(MAX77857_INT_SRC_OCP, val) ||
+	    FIELD_GET(MAX77857_INT_SRC_HARDSHORT, val))
+		*flags |= REGULATOR_ERROR_OVER_CURRENT;
+
+	if (FIELD_GET(MAX77857_INT_SRC_THS, val))
+		*flags |= REGULATOR_ERROR_OVER_TEMP;
+
+	if (!FIELD_GET(MAX77857_INT_SRC_POK, val))
+		*flags |= REGULATOR_ERROR_FAIL;
+
+	return 0;
+}
+
+static struct linear_range max77859_lin_ranges[] = {
+	REGULATOR_LINEAR_RANGE(3200000, 0x0A0, 0x320, 20000)
+};
+
+static const unsigned int max77859_ramp_table[4] = {
+	1000, 500, 250, 125
+};
+
+static int max77859_set_voltage_sel(struct regulator_dev *rdev,
+				    unsigned int sel)
+{
+	__be16 reg;
+	int ret;
+
+	reg = cpu_to_be16(sel);
+
+	ret = regmap_bulk_write(rdev->regmap, MAX77859_REG_CONT3, &reg, 2);
+	if (ret)
+		return ret;
+
+	/* actually apply new voltage */
+	return regmap_set_bits(rdev->regmap, MAX77859_REG_CONT3,
+			       MAX77859_CONT3_DVS_START);
+}
+
+int max77859_get_voltage_sel(struct regulator_dev *rdev)
+{
+	__be16 reg;
+	int ret;
+
+	ret = regmap_bulk_read(rdev->regmap, MAX77859_REG_CONT3, &reg, 2);
+	if (ret)
+		return ret;
+
+	return FIELD_GET(MAX77859_VOLTAGE_SEL_MASK, __be16_to_cpu(reg));
+}
+
+int max77859_set_current_limit(struct regulator_dev *rdev, int min_uA, int max_uA)
+{
+	u32 selector;
+
+	if (max_uA < MAX77859_CURRENT_MIN)
+		return -EINVAL;
+
+	selector = 0x12 + (max_uA - MAX77859_CURRENT_MIN) / MAX77859_CURRENT_STEP;
+
+	selector = clamp_val(selector, 0x00, 0x7F);
+
+	return regmap_write(rdev->regmap, MAX77859_REG_CONT5, selector);
+}
+
+int max77859_get_current_limit(struct regulator_dev *rdev)
+{
+	u32 selector;
+	int ret;
+
+	ret = regmap_read(rdev->regmap, MAX77859_REG_CONT5, &selector);
+	if (ret)
+		return ret;
+
+	if (selector <= 0x12)
+		return MAX77859_CURRENT_MIN;
+
+	if (selector >= 0x64)
+		return MAX77859_CURRENT_MAX;
+
+	return MAX77859_CURRENT_MIN + (selector - 0x12) * MAX77859_CURRENT_STEP;
+}
+
+static const struct regulator_ops max77859_regulator_ops = {
+	.list_voltage = regulator_list_voltage_linear_range,
+	.set_voltage_sel = max77859_set_voltage_sel,
+	.get_voltage_sel = max77859_get_voltage_sel,
+	.set_ramp_delay = regulator_set_ramp_delay_regmap,
+	.get_status = max77857_get_status,
+	.set_mode = max77857_set_mode,
+	.get_mode = max77857_get_mode,
+	.get_error_flags = max77857_get_error_flags,
+};
+
+static const struct regulator_ops max77859a_regulator_ops = {
+	.list_voltage = regulator_list_voltage_linear_range,
+	.set_voltage_sel = max77859_set_voltage_sel,
+	.get_voltage_sel = max77859_get_voltage_sel,
+	.set_current_limit = max77859_set_current_limit,
+	.get_current_limit = max77859_get_current_limit,
+	.set_ramp_delay = regulator_set_ramp_delay_regmap,
+	.get_status = max77857_get_status,
+	.set_mode = max77857_set_mode,
+	.get_mode = max77857_get_mode,
+	.get_error_flags = max77857_get_error_flags,
+};
+
+static const struct regulator_ops max77857_regulator_ops = {
+	.list_voltage = regulator_list_voltage_linear_range,
+	.set_voltage_sel = regulator_set_voltage_sel_regmap,
+	.get_voltage_sel = regulator_get_voltage_sel_regmap,
+	.set_ramp_delay = regulator_set_ramp_delay_regmap,
+	.get_status = max77857_get_status,
+	.set_mode = max77857_set_mode,
+	.get_mode = max77857_get_mode,
+	.get_error_flags = max77857_get_error_flags,
+};
+
+static struct linear_range max77857_lin_ranges[] = {
+	REGULATOR_LINEAR_RANGE(4485000, 0x3D, 0xCC, 73500)
+};
+
+static const unsigned int max77857_switch_freq[] = {
+	1200000, 1500000, 1800000, 2100000
+};
+
+static const unsigned int max77857_ramp_table[2][4] = {
+	{ 1333, 667, 333, 227 }, /* when switch freq is 1.8MHz or 2.1MHz */
+	{ 1166, 667, 333, 167 }, /* when switch freq is 1.2MHz or 1.5MHz */
+};
+
+static struct regulator_desc max77857_regulator_desc = {
+	.ops = &max77857_regulator_ops,
+	.name = "max77857",
+	.linear_ranges = max77857_lin_ranges,
+	.n_linear_ranges = ARRAY_SIZE(max77857_lin_ranges),
+	.vsel_mask = 0xFF,
+	.vsel_reg = MAX77857_REG_CONT2,
+	.ramp_delay_table = max77857_ramp_table[0],
+	.n_ramp_values = ARRAY_SIZE(max77857_ramp_table[0]),
+	.ramp_reg = MAX77857_REG_CONT3,
+	.ramp_mask = GENMASK(1, 0),
+	.ramp_delay = max77857_ramp_table[0][0],
+	.owner = THIS_MODULE,
+};
+
+static void max77857_calc_range(struct device *dev, enum max77857_id id)
+{
+	struct linear_range *range;
+	unsigned long vref_step;
+	u32 rtop = 0;
+	u32 rbot = 0;
+
+	device_property_read_u32(dev, "adi,rtop-ohms", &rtop);
+	device_property_read_u32(dev, "adi,rbot-ohms", &rbot);
+
+	if (!rbot || !rtop)
+		return;
+
+	switch (id) {
+	case ID_MAX77831:
+	case ID_MAX77857:
+		range = max77857_lin_ranges;
+		vref_step = 4900UL;
+		break;
+	case ID_MAX77859:
+	case ID_MAX77859A:
+		range = max77859_lin_ranges;
+		vref_step = 1250UL;
+		break;
+	}
+
+	range->step = DIV_ROUND_CLOSEST(vref_step * (rbot + rtop), rbot);
+	range->min = range->step * range->min_sel;
+}
+
+static int max77857_probe(struct i2c_client *client)
+{
+	const struct i2c_device_id *i2c_id;
+	struct device *dev = &client->dev;
+	struct regulator_config cfg = { };
+	struct regulator_dev *rdev;
+	struct regmap *regmap;
+	enum max77857_id id;
+	u32 switch_freq = 0;
+	int ret;
+
+	i2c_id = i2c_client_get_device_id(client);
+	if (!i2c_id)
+		return -EINVAL;
+
+	id = i2c_id->driver_data;
+
+	dev_set_drvdata(dev, (void *)id);
+
+	if (id == ID_MAX77859 || id == ID_MAX77859A) {
+		max77857_regulator_desc.ops = &max77859_regulator_ops;
+		max77857_regulator_desc.linear_ranges = max77859_lin_ranges;
+		max77857_regulator_desc.ramp_delay_table = max77859_ramp_table;
+		max77857_regulator_desc.ramp_delay = max77859_ramp_table[0];
+	}
+
+	if (id == ID_MAX77859A)
+		max77857_regulator_desc.ops = &max77859a_regulator_ops;
+
+	max77857_calc_range(dev, id);
+
+	regmap = devm_regmap_init_i2c(client, &max77857_regmap_config);
+	if (IS_ERR(regmap))
+		return dev_err_probe(dev, PTR_ERR(regmap),
+				     "cannot initialize regmap\n");
+
+	device_property_read_u32(dev, "adi,switch-frequency-hz", &switch_freq);
+	if (switch_freq) {
+		switch_freq = find_closest(switch_freq, max77857_switch_freq,
+					   ARRAY_SIZE(max77857_switch_freq));
+
+		if (id == ID_MAX77831 && switch_freq == 3)
+			switch_freq = 2;
+
+		switch (id) {
+		case ID_MAX77831:
+		case ID_MAX77857:
+			ret = regmap_update_bits(regmap, MAX77857_REG_CONT1,
+						 MAX77857_CONT1_FREQ, switch_freq);
+
+			if (switch_freq >= 2)
+				break;
+
+			max77857_regulator_desc.ramp_delay_table = max77857_ramp_table[1];
+			max77857_regulator_desc.ramp_delay = max77857_ramp_table[1][0];
+			break;
+		case ID_MAX77859:
+		case ID_MAX77859A:
+			ret = regmap_update_bits(regmap, MAX77859_REG_CONT1,
+						 MAX77857_CONT1_FREQ, switch_freq);
+			break;
+		}
+		if (ret)
+			return ret;
+	}
+
+	cfg.dev = dev;
+	cfg.driver_data = (void *)id;
+	cfg.regmap = regmap;
+	cfg.init_data = of_get_regulator_init_data(dev, dev->of_node,
+						   &max77857_regulator_desc);
+	if (!cfg.init_data)
+		return -ENOMEM;
+
+	rdev = devm_regulator_register(dev, &max77857_regulator_desc, &cfg);
+	if (IS_ERR(rdev))
+		return dev_err_probe(dev, PTR_ERR(rdev),
+				     "cannot register regulator\n");
+
+	return 0;
+}
+
+const struct i2c_device_id max77857_id[] = {
+	{ "max77831", ID_MAX77831 },
+	{ "max77857", ID_MAX77857 },
+	{ "max77859", ID_MAX77859 },
+	{ "max77859a", ID_MAX77859A },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, max77857_id);
+
+static const struct of_device_id max77857_of_id[] = {
+	{ .compatible = "adi,max77831", .data = (void *)ID_MAX77831 },
+	{ .compatible = "adi,max77857", .data = (void *)ID_MAX77857 },
+	{ .compatible = "adi,max77859", .data = (void *)ID_MAX77859 },
+	{ .compatible = "adi,max77859a", .data = (void *)ID_MAX77859A },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, max77857_of_id);
+
+struct i2c_driver max77857_driver = {
+	.driver = {
+		.name = "max77857",
+		.of_match_table = max77857_of_id,
+	},
+	.id_table = max77857_id,
+	.probe_new = max77857_probe,
+};
+module_i2c_driver(max77857_driver);
+
+MODULE_DESCRIPTION("Analog Devices MAX77857 Buck-Boost Converter Driver");
+MODULE_AUTHOR("Ibrahim Tilki <Ibrahim.Tilki@...log.com>");
+MODULE_AUTHOR("Okan Sahin <Okan.Sahin@...log.com>");
+MODULE_LICENSE("GPL");
-- 
2.30.2

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