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366 lines
10 KiB
366 lines
10 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* TI LM363X Regulator Driver |
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* |
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* Copyright 2015 Texas Instruments |
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* |
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* Author: Milo Kim <[email protected]> |
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*/ |
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#include <linux/err.h> |
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#include <linux/kernel.h> |
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#include <linux/mfd/ti-lmu.h> |
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#include <linux/mfd/ti-lmu-register.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/gpio/consumer.h> |
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#include <linux/platform_device.h> |
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#include <linux/regulator/driver.h> |
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#include <linux/regulator/of_regulator.h> |
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#include <linux/slab.h> |
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/* LM3631 */ |
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#define LM3631_BOOST_VSEL_MAX 0x25 |
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#define LM3631_LDO_VSEL_MAX 0x28 |
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#define LM3631_CONT_VSEL_MAX 0x03 |
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#define LM3631_VBOOST_MIN 4500000 |
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#define LM3631_VCONT_MIN 1800000 |
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#define LM3631_VLDO_MIN 4000000 |
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#define ENABLE_TIME_USEC 1000 |
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/* LM3632 */ |
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#define LM3632_BOOST_VSEL_MAX 0x26 |
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#define LM3632_LDO_VSEL_MAX 0x28 |
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#define LM3632_VBOOST_MIN 4500000 |
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#define LM3632_VLDO_MIN 4000000 |
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/* LM36274 */ |
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#define LM36274_BOOST_VSEL_MAX 0x3f |
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#define LM36274_LDO_VSEL_MAX 0x32 |
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#define LM36274_VOLTAGE_MIN 4000000 |
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/* Common */ |
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#define LM363X_STEP_50mV 50000 |
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#define LM363X_STEP_500mV 500000 |
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static const int ldo_cont_enable_time[] = { |
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0, 2000, 5000, 10000, 20000, 50000, 100000, 200000, |
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}; |
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static int lm363x_regulator_enable_time(struct regulator_dev *rdev) |
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{ |
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enum lm363x_regulator_id id = rdev_get_id(rdev); |
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unsigned int val, addr, mask; |
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switch (id) { |
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case LM3631_LDO_CONT: |
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addr = LM3631_REG_ENTIME_VCONT; |
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mask = LM3631_ENTIME_CONT_MASK; |
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break; |
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case LM3631_LDO_OREF: |
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addr = LM3631_REG_ENTIME_VOREF; |
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mask = LM3631_ENTIME_MASK; |
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break; |
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case LM3631_LDO_POS: |
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addr = LM3631_REG_ENTIME_VPOS; |
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mask = LM3631_ENTIME_MASK; |
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break; |
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case LM3631_LDO_NEG: |
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addr = LM3631_REG_ENTIME_VNEG; |
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mask = LM3631_ENTIME_MASK; |
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break; |
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default: |
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return 0; |
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} |
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if (regmap_read(rdev->regmap, addr, &val)) |
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return -EINVAL; |
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val = (val & mask) >> LM3631_ENTIME_SHIFT; |
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if (id == LM3631_LDO_CONT) |
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return ldo_cont_enable_time[val]; |
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else |
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return ENABLE_TIME_USEC * val; |
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} |
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static const struct regulator_ops lm363x_boost_voltage_table_ops = { |
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.list_voltage = regulator_list_voltage_linear, |
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.set_voltage_sel = regulator_set_voltage_sel_regmap, |
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.get_voltage_sel = regulator_get_voltage_sel_regmap, |
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}; |
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static const struct regulator_ops lm363x_regulator_voltage_table_ops = { |
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.list_voltage = regulator_list_voltage_linear, |
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.set_voltage_sel = regulator_set_voltage_sel_regmap, |
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.get_voltage_sel = regulator_get_voltage_sel_regmap, |
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.enable = regulator_enable_regmap, |
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.disable = regulator_disable_regmap, |
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.is_enabled = regulator_is_enabled_regmap, |
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.enable_time = lm363x_regulator_enable_time, |
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}; |
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static const struct regulator_desc lm363x_regulator_desc[] = { |
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/* LM3631 */ |
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{ |
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.name = "vboost", |
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.of_match = "vboost", |
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.id = LM3631_BOOST, |
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.ops = &lm363x_boost_voltage_table_ops, |
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.n_voltages = LM3631_BOOST_VSEL_MAX + 1, |
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.min_uV = LM3631_VBOOST_MIN, |
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.uV_step = LM363X_STEP_50mV, |
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.type = REGULATOR_VOLTAGE, |
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.owner = THIS_MODULE, |
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.vsel_reg = LM3631_REG_VOUT_BOOST, |
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.vsel_mask = LM3631_VOUT_MASK, |
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}, |
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{ |
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.name = "ldo_cont", |
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.of_match = "vcont", |
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.id = LM3631_LDO_CONT, |
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.ops = &lm363x_regulator_voltage_table_ops, |
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.n_voltages = LM3631_CONT_VSEL_MAX + 1, |
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.min_uV = LM3631_VCONT_MIN, |
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.uV_step = LM363X_STEP_500mV, |
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.type = REGULATOR_VOLTAGE, |
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.owner = THIS_MODULE, |
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.vsel_reg = LM3631_REG_VOUT_CONT, |
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.vsel_mask = LM3631_VOUT_CONT_MASK, |
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.enable_reg = LM3631_REG_LDO_CTRL2, |
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.enable_mask = LM3631_EN_CONT_MASK, |
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}, |
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{ |
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.name = "ldo_oref", |
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.of_match = "voref", |
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.id = LM3631_LDO_OREF, |
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.ops = &lm363x_regulator_voltage_table_ops, |
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.n_voltages = LM3631_LDO_VSEL_MAX + 1, |
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.min_uV = LM3631_VLDO_MIN, |
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.uV_step = LM363X_STEP_50mV, |
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.type = REGULATOR_VOLTAGE, |
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.owner = THIS_MODULE, |
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.vsel_reg = LM3631_REG_VOUT_OREF, |
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.vsel_mask = LM3631_VOUT_MASK, |
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.enable_reg = LM3631_REG_LDO_CTRL1, |
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.enable_mask = LM3631_EN_OREF_MASK, |
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}, |
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{ |
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.name = "ldo_vpos", |
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.of_match = "vpos", |
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.id = LM3631_LDO_POS, |
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.ops = &lm363x_regulator_voltage_table_ops, |
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.n_voltages = LM3631_LDO_VSEL_MAX + 1, |
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.min_uV = LM3631_VLDO_MIN, |
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.uV_step = LM363X_STEP_50mV, |
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.type = REGULATOR_VOLTAGE, |
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.owner = THIS_MODULE, |
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.vsel_reg = LM3631_REG_VOUT_POS, |
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.vsel_mask = LM3631_VOUT_MASK, |
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.enable_reg = LM3631_REG_LDO_CTRL1, |
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.enable_mask = LM3631_EN_VPOS_MASK, |
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}, |
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{ |
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.name = "ldo_vneg", |
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.of_match = "vneg", |
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.id = LM3631_LDO_NEG, |
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.ops = &lm363x_regulator_voltage_table_ops, |
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.n_voltages = LM3631_LDO_VSEL_MAX + 1, |
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.min_uV = LM3631_VLDO_MIN, |
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.uV_step = LM363X_STEP_50mV, |
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.type = REGULATOR_VOLTAGE, |
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.owner = THIS_MODULE, |
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.vsel_reg = LM3631_REG_VOUT_NEG, |
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.vsel_mask = LM3631_VOUT_MASK, |
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.enable_reg = LM3631_REG_LDO_CTRL1, |
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.enable_mask = LM3631_EN_VNEG_MASK, |
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}, |
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/* LM3632 */ |
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{ |
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.name = "vboost", |
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.of_match = "vboost", |
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.id = LM3632_BOOST, |
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.ops = &lm363x_boost_voltage_table_ops, |
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.n_voltages = LM3632_BOOST_VSEL_MAX + 1, |
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.min_uV = LM3632_VBOOST_MIN, |
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.uV_step = LM363X_STEP_50mV, |
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.type = REGULATOR_VOLTAGE, |
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.owner = THIS_MODULE, |
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.vsel_reg = LM3632_REG_VOUT_BOOST, |
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.vsel_mask = LM3632_VOUT_MASK, |
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}, |
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{ |
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.name = "ldo_vpos", |
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.of_match = "vpos", |
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.id = LM3632_LDO_POS, |
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.ops = &lm363x_regulator_voltage_table_ops, |
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.n_voltages = LM3632_LDO_VSEL_MAX + 1, |
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.min_uV = LM3632_VLDO_MIN, |
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.uV_step = LM363X_STEP_50mV, |
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.type = REGULATOR_VOLTAGE, |
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.owner = THIS_MODULE, |
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.vsel_reg = LM3632_REG_VOUT_POS, |
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.vsel_mask = LM3632_VOUT_MASK, |
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.enable_reg = LM3632_REG_BIAS_CONFIG, |
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.enable_mask = LM3632_EN_VPOS_MASK, |
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}, |
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{ |
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.name = "ldo_vneg", |
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.of_match = "vneg", |
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.id = LM3632_LDO_NEG, |
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.ops = &lm363x_regulator_voltage_table_ops, |
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.n_voltages = LM3632_LDO_VSEL_MAX + 1, |
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.min_uV = LM3632_VLDO_MIN, |
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.uV_step = LM363X_STEP_50mV, |
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.type = REGULATOR_VOLTAGE, |
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.owner = THIS_MODULE, |
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.vsel_reg = LM3632_REG_VOUT_NEG, |
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.vsel_mask = LM3632_VOUT_MASK, |
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.enable_reg = LM3632_REG_BIAS_CONFIG, |
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.enable_mask = LM3632_EN_VNEG_MASK, |
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}, |
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/* LM36274 */ |
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{ |
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.name = "vboost", |
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.of_match = "vboost", |
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.id = LM36274_BOOST, |
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.ops = &lm363x_boost_voltage_table_ops, |
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.n_voltages = LM36274_BOOST_VSEL_MAX + 1, |
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.min_uV = LM36274_VOLTAGE_MIN, |
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.uV_step = LM363X_STEP_50mV, |
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.type = REGULATOR_VOLTAGE, |
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.owner = THIS_MODULE, |
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.vsel_reg = LM36274_REG_VOUT_BOOST, |
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.vsel_mask = LM36274_VOUT_MASK, |
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}, |
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{ |
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.name = "ldo_vpos", |
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.of_match = "vpos", |
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.id = LM36274_LDO_POS, |
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.ops = &lm363x_regulator_voltage_table_ops, |
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.n_voltages = LM36274_LDO_VSEL_MAX + 1, |
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.min_uV = LM36274_VOLTAGE_MIN, |
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.uV_step = LM363X_STEP_50mV, |
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.type = REGULATOR_VOLTAGE, |
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.owner = THIS_MODULE, |
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.vsel_reg = LM36274_REG_VOUT_POS, |
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.vsel_mask = LM36274_VOUT_MASK, |
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.enable_reg = LM36274_REG_BIAS_CONFIG_1, |
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.enable_mask = LM36274_EN_VPOS_MASK, |
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}, |
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{ |
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.name = "ldo_vneg", |
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.of_match = "vneg", |
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.id = LM36274_LDO_NEG, |
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.ops = &lm363x_regulator_voltage_table_ops, |
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.n_voltages = LM36274_LDO_VSEL_MAX + 1, |
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.min_uV = LM36274_VOLTAGE_MIN, |
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.uV_step = LM363X_STEP_50mV, |
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.type = REGULATOR_VOLTAGE, |
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.owner = THIS_MODULE, |
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.vsel_reg = LM36274_REG_VOUT_NEG, |
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.vsel_mask = LM36274_VOUT_MASK, |
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.enable_reg = LM36274_REG_BIAS_CONFIG_1, |
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.enable_mask = LM36274_EN_VNEG_MASK, |
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}, |
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}; |
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static struct gpio_desc *lm363x_regulator_of_get_enable_gpio(struct device *dev, int id) |
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{ |
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/* |
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* Check LCM_EN1/2_GPIO is configured. |
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* Those pins are used for enabling VPOS/VNEG LDOs. |
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* Do not use devm* here: the regulator core takes over the |
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* lifecycle management of the GPIO descriptor. |
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*/ |
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switch (id) { |
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case LM3632_LDO_POS: |
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case LM36274_LDO_POS: |
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return gpiod_get_index_optional(dev, "enable", 0, |
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GPIOD_OUT_LOW | GPIOD_FLAGS_BIT_NONEXCLUSIVE); |
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case LM3632_LDO_NEG: |
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case LM36274_LDO_NEG: |
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return gpiod_get_index_optional(dev, "enable", 1, |
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GPIOD_OUT_LOW | GPIOD_FLAGS_BIT_NONEXCLUSIVE); |
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default: |
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return NULL; |
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} |
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} |
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static int lm363x_regulator_set_ext_en(struct regmap *regmap, int id) |
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{ |
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int ext_en_mask = 0; |
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switch (id) { |
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case LM3632_LDO_POS: |
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case LM3632_LDO_NEG: |
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ext_en_mask = LM3632_EXT_EN_MASK; |
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break; |
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case LM36274_LDO_POS: |
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case LM36274_LDO_NEG: |
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ext_en_mask = LM36274_EXT_EN_MASK; |
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break; |
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default: |
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return -ENODEV; |
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} |
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return regmap_update_bits(regmap, lm363x_regulator_desc[id].enable_reg, |
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ext_en_mask, ext_en_mask); |
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} |
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static int lm363x_regulator_probe(struct platform_device *pdev) |
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{ |
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struct ti_lmu *lmu = dev_get_drvdata(pdev->dev.parent); |
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struct regmap *regmap = lmu->regmap; |
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struct regulator_config cfg = { }; |
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struct regulator_dev *rdev; |
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struct device *dev = &pdev->dev; |
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int id = pdev->id; |
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struct gpio_desc *gpiod; |
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int ret; |
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cfg.dev = dev; |
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cfg.regmap = regmap; |
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/* |
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* LM3632 LDOs can be controlled by external pin. |
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* Register update is required if the pin is used. |
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*/ |
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gpiod = lm363x_regulator_of_get_enable_gpio(dev, id); |
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if (IS_ERR(gpiod)) |
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return PTR_ERR(gpiod); |
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if (gpiod) { |
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cfg.ena_gpiod = gpiod; |
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ret = lm363x_regulator_set_ext_en(regmap, id); |
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if (ret) { |
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gpiod_put(gpiod); |
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dev_err(dev, "External pin err: %d\n", ret); |
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return ret; |
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} |
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} |
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rdev = devm_regulator_register(dev, &lm363x_regulator_desc[id], &cfg); |
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if (IS_ERR(rdev)) { |
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ret = PTR_ERR(rdev); |
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dev_err(dev, "[%d] regulator register err: %d\n", id, ret); |
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return ret; |
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} |
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return 0; |
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} |
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static struct platform_driver lm363x_regulator_driver = { |
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.probe = lm363x_regulator_probe, |
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.driver = { |
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.name = "lm363x-regulator", |
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}, |
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}; |
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module_platform_driver(lm363x_regulator_driver); |
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MODULE_DESCRIPTION("TI LM363X Regulator Driver"); |
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MODULE_AUTHOR("Milo Kim"); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_ALIAS("platform:lm363x-regulator");
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