Eric Lee / smarc-fsl-linux-kernel

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drivers/regulator/bd70528-regulator.c 8.29 KB
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  // SPDX-License-Identifier: GPL-2.0
  // Copyright (C) 2018 ROHM Semiconductors
  // bd70528-regulator.c ROHM BD70528MWV regulator driver
  
  #include <linux/delay.h>
  #include <linux/err.h>
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  #include <linux/interrupt.h>
  #include <linux/kernel.h>
  #include <linux/mfd/rohm-bd70528.h>
  #include <linux/module.h>
  #include <linux/of.h>
  #include <linux/platform_device.h>
  #include <linux/regmap.h>
  #include <linux/regulator/driver.h>
  #include <linux/regulator/machine.h>
  #include <linux/regulator/of_regulator.h>
  #include <linux/slab.h>
  
  #define BUCK_RAMPRATE_250MV 0
  #define BUCK_RAMPRATE_125MV 1
  #define BUCK_RAMP_MAX 250
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  static const struct linear_range bd70528_buck1_volts[] = {
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  	REGULATOR_LINEAR_RANGE(1200000, 0x00, 0x1, 600000),
  	REGULATOR_LINEAR_RANGE(2750000, 0x2, 0xf, 50000),
  };
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  static const struct linear_range bd70528_buck2_volts[] = {
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  	REGULATOR_LINEAR_RANGE(1200000, 0x00, 0x1, 300000),
  	REGULATOR_LINEAR_RANGE(1550000, 0x2, 0xd, 50000),
  	REGULATOR_LINEAR_RANGE(3000000, 0xe, 0xf, 300000),
  };
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  static const struct linear_range bd70528_buck3_volts[] = {
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  	REGULATOR_LINEAR_RANGE(800000, 0x00, 0xd, 50000),
  	REGULATOR_LINEAR_RANGE(1800000, 0xe, 0xf, 0),
  };
  
  /* All LDOs have same voltage ranges */
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  static const struct linear_range bd70528_ldo_volts[] = {
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  	REGULATOR_LINEAR_RANGE(1650000, 0x0, 0x07, 50000),
  	REGULATOR_LINEAR_RANGE(2100000, 0x8, 0x0f, 100000),
  	REGULATOR_LINEAR_RANGE(2850000, 0x10, 0x19, 50000),
  	REGULATOR_LINEAR_RANGE(3300000, 0x19, 0x1f, 0),
  };
  
  /* Also both LEDs support same voltages */
  static const unsigned int led_volts[] = {
  	20000, 30000
  };
  
  static int bd70528_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
  {
  	if (ramp_delay > 0 && ramp_delay <= BUCK_RAMP_MAX) {
  		unsigned int ramp_value = BUCK_RAMPRATE_250MV;
  
  		if (ramp_delay <= 125)
  			ramp_value = BUCK_RAMPRATE_125MV;
  
  		return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
  				  BD70528_MASK_BUCK_RAMP,
  				  ramp_value << BD70528_SIFT_BUCK_RAMP);
  	}
  	dev_err(&rdev->dev, "%s: ramp_delay: %d not supported
  ",
  		rdev->desc->name, ramp_delay);
  	return -EINVAL;
  }
  
  static int bd70528_led_set_voltage_sel(struct regulator_dev *rdev,
  				       unsigned int sel)
  {
  	int ret;
  
  	ret = regulator_is_enabled_regmap(rdev);
  	if (ret < 0)
  		return ret;
  
  	if (ret == 0)
  		return regulator_set_voltage_sel_regmap(rdev, sel);
  
  	dev_err(&rdev->dev,
  		"LED voltage change not allowed when led is enabled
  ");
  
  	return -EBUSY;
  }
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  static const struct regulator_ops bd70528_buck_ops = {
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  	.enable = regulator_enable_regmap,
  	.disable = regulator_disable_regmap,
  	.is_enabled = regulator_is_enabled_regmap,
  	.list_voltage = regulator_list_voltage_linear_range,
  	.set_voltage_sel = regulator_set_voltage_sel_regmap,
  	.get_voltage_sel = regulator_get_voltage_sel_regmap,
  	.set_voltage_time_sel = regulator_set_voltage_time_sel,
  	.set_ramp_delay = bd70528_set_ramp_delay,
  };
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  static const struct regulator_ops bd70528_ldo_ops = {
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  	.enable = regulator_enable_regmap,
  	.disable = regulator_disable_regmap,
  	.is_enabled = regulator_is_enabled_regmap,
  	.list_voltage = regulator_list_voltage_linear_range,
  	.set_voltage_sel = regulator_set_voltage_sel_regmap,
  	.get_voltage_sel = regulator_get_voltage_sel_regmap,
  	.set_voltage_time_sel = regulator_set_voltage_time_sel,
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  };
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  static const struct regulator_ops bd70528_led_ops = {
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  	.enable = regulator_enable_regmap,
  	.disable = regulator_disable_regmap,
  	.is_enabled = regulator_is_enabled_regmap,
  	.list_voltage = regulator_list_voltage_table,
  	.set_voltage_sel = bd70528_led_set_voltage_sel,
  	.get_voltage_sel = regulator_get_voltage_sel_regmap,
  };
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  static const struct regulator_desc bd70528_desc[] = {
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  	{
  		.name = "buck1",
  		.of_match = of_match_ptr("BUCK1"),
  		.regulators_node = of_match_ptr("regulators"),
  		.id = BD70528_BUCK1,
  		.ops = &bd70528_buck_ops,
  		.type = REGULATOR_VOLTAGE,
  		.linear_ranges = bd70528_buck1_volts,
  		.n_linear_ranges = ARRAY_SIZE(bd70528_buck1_volts),
  		.n_voltages = BD70528_BUCK_VOLTS,
  		.enable_reg = BD70528_REG_BUCK1_EN,
  		.enable_mask = BD70528_MASK_RUN_EN,
  		.vsel_reg = BD70528_REG_BUCK1_VOLT,
  		.vsel_mask = BD70528_MASK_BUCK_VOLT,
  		.owner = THIS_MODULE,
  	},
  	{
  		.name = "buck2",
  		.of_match = of_match_ptr("BUCK2"),
  		.regulators_node = of_match_ptr("regulators"),
  		.id = BD70528_BUCK2,
  		.ops = &bd70528_buck_ops,
  		.type = REGULATOR_VOLTAGE,
  		.linear_ranges = bd70528_buck2_volts,
  		.n_linear_ranges = ARRAY_SIZE(bd70528_buck2_volts),
  		.n_voltages = BD70528_BUCK_VOLTS,
  		.enable_reg = BD70528_REG_BUCK2_EN,
  		.enable_mask = BD70528_MASK_RUN_EN,
  		.vsel_reg = BD70528_REG_BUCK2_VOLT,
  		.vsel_mask = BD70528_MASK_BUCK_VOLT,
  		.owner = THIS_MODULE,
  	},
  	{
  		.name = "buck3",
  		.of_match = of_match_ptr("BUCK3"),
  		.regulators_node = of_match_ptr("regulators"),
  		.id = BD70528_BUCK3,
  		.ops = &bd70528_buck_ops,
  		.type = REGULATOR_VOLTAGE,
  		.linear_ranges = bd70528_buck3_volts,
  		.n_linear_ranges = ARRAY_SIZE(bd70528_buck3_volts),
  		.n_voltages = BD70528_BUCK_VOLTS,
  		.enable_reg = BD70528_REG_BUCK3_EN,
  		.enable_mask = BD70528_MASK_RUN_EN,
  		.vsel_reg = BD70528_REG_BUCK3_VOLT,
  		.vsel_mask = BD70528_MASK_BUCK_VOLT,
  		.owner = THIS_MODULE,
  	},
  	{
  		.name = "ldo1",
  		.of_match = of_match_ptr("LDO1"),
  		.regulators_node = of_match_ptr("regulators"),
  		.id = BD70528_LDO1,
  		.ops = &bd70528_ldo_ops,
  		.type = REGULATOR_VOLTAGE,
  		.linear_ranges = bd70528_ldo_volts,
  		.n_linear_ranges = ARRAY_SIZE(bd70528_ldo_volts),
  		.n_voltages = BD70528_LDO_VOLTS,
  		.enable_reg = BD70528_REG_LDO1_EN,
  		.enable_mask = BD70528_MASK_RUN_EN,
  		.vsel_reg = BD70528_REG_LDO1_VOLT,
  		.vsel_mask = BD70528_MASK_LDO_VOLT,
  		.owner = THIS_MODULE,
  	},
  	{
  		.name = "ldo2",
  		.of_match = of_match_ptr("LDO2"),
  		.regulators_node = of_match_ptr("regulators"),
  		.id = BD70528_LDO2,
  		.ops = &bd70528_ldo_ops,
  		.type = REGULATOR_VOLTAGE,
  		.linear_ranges = bd70528_ldo_volts,
  		.n_linear_ranges = ARRAY_SIZE(bd70528_ldo_volts),
  		.n_voltages = BD70528_LDO_VOLTS,
  		.enable_reg = BD70528_REG_LDO2_EN,
  		.enable_mask = BD70528_MASK_RUN_EN,
  		.vsel_reg = BD70528_REG_LDO2_VOLT,
  		.vsel_mask = BD70528_MASK_LDO_VOLT,
  		.owner = THIS_MODULE,
  	},
  	{
  		.name = "ldo3",
  		.of_match = of_match_ptr("LDO3"),
  		.regulators_node = of_match_ptr("regulators"),
  		.id = BD70528_LDO3,
  		.ops = &bd70528_ldo_ops,
  		.type = REGULATOR_VOLTAGE,
  		.linear_ranges = bd70528_ldo_volts,
  		.n_linear_ranges = ARRAY_SIZE(bd70528_ldo_volts),
  		.n_voltages = BD70528_LDO_VOLTS,
  		.enable_reg = BD70528_REG_LDO3_EN,
  		.enable_mask = BD70528_MASK_RUN_EN,
  		.vsel_reg = BD70528_REG_LDO3_VOLT,
  		.vsel_mask = BD70528_MASK_LDO_VOLT,
  		.owner = THIS_MODULE,
  	},
  	{
  		.name = "ldo_led1",
  		.of_match = of_match_ptr("LDO_LED1"),
  		.regulators_node = of_match_ptr("regulators"),
  		.id = BD70528_LED1,
  		.ops = &bd70528_led_ops,
  		.type = REGULATOR_VOLTAGE,
  		.volt_table = &led_volts[0],
  		.n_voltages = ARRAY_SIZE(led_volts),
  		.enable_reg = BD70528_REG_LED_EN,
  		.enable_mask = BD70528_MASK_LED1_EN,
  		.vsel_reg = BD70528_REG_LED_VOLT,
  		.vsel_mask = BD70528_MASK_LED1_VOLT,
  		.owner = THIS_MODULE,
  	},
  	{
  		.name = "ldo_led2",
  		.of_match = of_match_ptr("LDO_LED2"),
  		.regulators_node = of_match_ptr("regulators"),
  		.id = BD70528_LED2,
  		.ops = &bd70528_led_ops,
  		.type = REGULATOR_VOLTAGE,
  		.volt_table = &led_volts[0],
  		.n_voltages = ARRAY_SIZE(led_volts),
  		.enable_reg = BD70528_REG_LED_EN,
  		.enable_mask = BD70528_MASK_LED2_EN,
  		.vsel_reg = BD70528_REG_LED_VOLT,
  		.vsel_mask = BD70528_MASK_LED2_VOLT,
  		.owner = THIS_MODULE,
  	},
  
  };
  
  static int bd70528_probe(struct platform_device *pdev)
  {
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  	struct rohm_regmap_dev *bd70528;
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  	int i;
  	struct regulator_config config = {
  		.dev = pdev->dev.parent,
  	};
  
  	bd70528 = dev_get_drvdata(pdev->dev.parent);
  	if (!bd70528) {
  		dev_err(&pdev->dev, "No MFD driver data
  ");
  		return -EINVAL;
  	}
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  	config.regmap = bd70528->regmap;
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  	for (i = 0; i < ARRAY_SIZE(bd70528_desc); i++) {
  		struct regulator_dev *rdev;
  
  		rdev = devm_regulator_register(&pdev->dev, &bd70528_desc[i],
  					       &config);
  		if (IS_ERR(rdev)) {
  			dev_err(&pdev->dev,
  				"failed to register %s regulator
  ",
  				bd70528_desc[i].name);
  			return PTR_ERR(rdev);
  		}
  	}
  	return 0;
  }
  
  static struct platform_driver bd70528_regulator = {
  	.driver = {
  		.name = "bd70528-pmic"
  	},
  	.probe = bd70528_probe,
  };
  
  module_platform_driver(bd70528_regulator);
  
  MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
  MODULE_DESCRIPTION("BD70528 voltage regulator driver");
  MODULE_LICENSE("GPL");
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  MODULE_ALIAS("platform:bd70528-pmic");