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regulator: Add Maxim MAX20411 support
Merge series from Bjorn Andersson <quic_bjorande@quicinc.com>: Introduce binding and driver for the Maxim MAX20411, and wire these up on the Qualcomm SA8295P ADP.
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‎Documentation/devicetree/bindings/regulator/maxim,max20411.yaml‎

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# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/regulator/maxim,max20411.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Maxim Integrated MAX20411 Step-Down DC-DC Converter
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maintainers:
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- Bjorn Andersson <andersson@kernel.org>
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description:
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The MAX20411 is a high-efficiency, DC-DC step-down converter. It provides
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configurable output voltage in the range of 0.5V to 1.275V, configurable over
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I2C.
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allOf:
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- $ref: regulator.yaml#
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properties:
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compatible:
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const: maxim,max20411
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reg:
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maxItems: 1
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enable-gpios:
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description: GPIO connected to the EN pin, active high
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vdd-supply:
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description: Input supply for the device (VDD pin, 3.0V to 5.5V)
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required:
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- compatible
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- reg
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- enable-gpios
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unevaluatedProperties: false
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examples:
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- |
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#include <dt-bindings/gpio/gpio.h>
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i2c {
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#address-cells = <1>;
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#size-cells = <0>;
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regulator@39 {
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compatible = "maxim,max20411";
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reg = <0x39>;
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enable-gpios = <&gpio 2 GPIO_ACTIVE_HIGH>;
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regulator-min-microvolt = <800000>;
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regulator-max-microvolt = <1000000>;
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};
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};
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...

‎drivers/regulator/Kconfig‎

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@@ -655,6 +655,14 @@ config REGULATOR_MAX20086
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protectorvia I2C bus. The regulator has 2 or 4 outputs depending on
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the device model. This driver is only capable to turn on/off them.
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config REGULATOR_MAX20411
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tristate "Maxim MAX20411 High-Efficiency Single Step-Down Converter"
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depends on I2C
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select REGMAP_I2C
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help
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This driver controls the Maxim MAX20411 family of high-efficiency,
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syncrhonous step-down converters.
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config REGULATOR_MAX77686
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tristate "Maxim 77686 regulator"
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depends on MFD_MAX77686 || COMPILE_TEST

‎drivers/regulator/Makefile‎

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@@ -80,6 +80,7 @@ obj-$(CONFIG_REGULATOR_MAX8973) += max8973-regulator.o
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obj-$(CONFIG_REGULATOR_MAX8997) += max8997-regulator.o
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obj-$(CONFIG_REGULATOR_MAX8998) += max8998.o
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obj-$(CONFIG_REGULATOR_MAX20086) += max20086-regulator.o
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obj-$(CONFIG_REGULATOR_MAX20411) += max20411-regulator.o
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obj-$(CONFIG_REGULATOR_MAX77686) += max77686-regulator.o
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obj-$(CONFIG_REGULATOR_MAX77693) += max77693-regulator.o
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obj-$(CONFIG_REGULATOR_MAX77802) += max77802-regulator.o

‎drivers/regulator/max20411-regulator.c‎

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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2021, The Linux Foundation. All rights reserved.
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* Copyright (c) 2022, Linaro Ltd.
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*/
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#include <linux/gpio/consumer.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/of_platform.h>
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#include <linux/regmap.h>
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#include <linux/regulator/driver.h>
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#include <linux/regulator/machine.h>
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#include <linux/regulator/of_regulator.h>
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#define MAX20411_UV_STEP 6250
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#define MAX20411_BASE_UV 243750
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#define MAX20411_MIN_SEL 41 /* 0.5V */
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#define MAX20411_MAX_SEL 165 /* 1.275V */
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#define MAX20411_VID_OFFSET 0x7
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#define MAX20411_VID_MASK 0xff
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#define MAX20411_SLEW_OFFSET 0x6
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#define MAX20411_SLEW_DVS_MASK 0xc
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#define MAX20411_SLEW_SR_MASK 0x3
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struct max20411 {
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struct device *dev;
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struct device_node *of_node;
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struct regulator_desc desc;
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struct regulator_dev *rdev;
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struct regmap *regmap;
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};
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static const unsigned int max20411_slew_rates[] = { 13100, 6600, 3300, 1600 };
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static int max20411_enable_time(struct regulator_dev *rdev)
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{
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int voltage, rate, ret;
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unsigned int val;
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/* get voltage */
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ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
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if (ret)
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return ret;
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val &= rdev->desc->vsel_mask;
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voltage = regulator_list_voltage_linear(rdev, val);
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/* get rate */
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ret = regmap_read(rdev->regmap, MAX20411_SLEW_OFFSET, &val);
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if (ret)
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return ret;
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val = FIELD_GET(MAX20411_SLEW_SR_MASK, val);
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rate = max20411_slew_rates[val];
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return DIV_ROUND_UP(voltage, rate);
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}
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static const struct regmap_config max20411_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = 0xe,
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};
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static const struct regulator_ops max20411_ops = {
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.get_voltage_sel = regulator_get_voltage_sel_regmap,
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.set_voltage_sel = regulator_set_voltage_sel_regmap,
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.list_voltage = regulator_list_voltage_linear,
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.enable_time = max20411_enable_time,
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};
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static const struct regulator_desc max20411_desc = {
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.ops = &max20411_ops,
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.owner = THIS_MODULE,
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.type = REGULATOR_VOLTAGE,
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.supply_name = "vin",
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.name = "max20411",
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/*
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* voltage = 0.24375V + selector * 6.25mV
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* with valid selector between 41 to 165 (0.5V to 1.275V)
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*/
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.min_uV = MAX20411_BASE_UV,
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.uV_step = MAX20411_UV_STEP,
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.linear_min_sel = MAX20411_MIN_SEL,
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.n_voltages = MAX20411_MAX_SEL,
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.vsel_reg = MAX20411_VID_OFFSET,
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.vsel_mask = MAX20411_VID_MASK,
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.ramp_reg = MAX20411_SLEW_OFFSET,
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.ramp_mask = MAX20411_SLEW_DVS_MASK,
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.ramp_delay_table = max20411_slew_rates,
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.n_ramp_values = ARRAY_SIZE(max20411_slew_rates),
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};
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static int max20411_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct regulator_init_data *init_data;
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struct device *dev = &client->dev;
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struct regulator_config cfg = {};
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struct max20411 *max20411;
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max20411 = devm_kzalloc(dev, sizeof(*max20411), GFP_KERNEL);
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if (!max20411)
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return -ENOMEM;
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max20411->regmap = devm_regmap_init_i2c(client, &max20411_regmap_config);
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if (IS_ERR(max20411->regmap)) {
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dev_err(dev, "Failed to allocate regmap!\n");
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return PTR_ERR(max20411->regmap);
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}
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max20411->dev = dev;
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max20411->of_node = dev->of_node;
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max20411->desc = max20411_desc;
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init_data = of_get_regulator_init_data(max20411->dev, max20411->of_node, &max20411->desc);
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if (!init_data)
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return -ENODATA;
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cfg.dev = max20411->dev;
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cfg.init_data = init_data;
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cfg.of_node = max20411->of_node;
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cfg.driver_data = max20411;
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cfg.ena_gpiod = gpiod_get(max20411->dev, "enable", GPIOD_ASIS);
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if (IS_ERR(cfg.ena_gpiod))
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return dev_err_probe(dev, PTR_ERR(cfg.ena_gpiod),
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"unable to acquire enable gpio\n");
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max20411->rdev = devm_regulator_register(max20411->dev, &max20411->desc, &cfg);
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if (IS_ERR(max20411->rdev))
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dev_err(max20411->dev, "Failed to register regulator\n");
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return PTR_ERR_OR_ZERO(max20411->rdev);
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}
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static const struct of_device_id of_max20411_match_tbl[] = {
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{ .compatible = "maxim,max20411", },
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{ },
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};
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MODULE_DEVICE_TABLE(of, of_max20411_match_tbl);
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static const struct i2c_device_id max20411_id[] = {
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{ "max20411", 0 },
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{ },
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};
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MODULE_DEVICE_TABLE(i2c, max20411_id);
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static struct i2c_driver max20411_i2c_driver = {
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.driver = {
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.name = "max20411",
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.of_match_table = of_max20411_match_tbl,
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},
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.probe = max20411_probe,
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.id_table = max20411_id,
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};
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module_i2c_driver(max20411_i2c_driver);
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MODULE_LICENSE("GPL");

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