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334 lines
9.3 KiB
334 lines
9.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
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// Copyright (C) 2020 ROHM Semiconductors |
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// ROHM BD9576MUF/BD9573MUF regulator driver |
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#include <linux/delay.h> |
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#include <linux/err.h> |
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#include <linux/gpio/consumer.h> |
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#include <linux/interrupt.h> |
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#include <linux/kernel.h> |
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#include <linux/mfd/rohm-bd957x.h> |
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#include <linux/mfd/rohm-generic.h> |
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#include <linux/module.h> |
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#include <linux/of.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/machine.h> |
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#include <linux/regulator/of_regulator.h> |
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#include <linux/slab.h> |
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#define BD957X_VOUTS1_VOLT 3300000 |
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#define BD957X_VOUTS4_BASE_VOLT 1030000 |
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#define BD957X_VOUTS34_NUM_VOLT 32 |
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static int vout1_volt_table[] = {5000000, 4900000, 4800000, 4700000, 4600000, |
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4500000, 4500000, 4500000, 5000000, 5100000, |
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5200000, 5300000, 5400000, 5500000, 5500000, |
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5500000}; |
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static int vout2_volt_table[] = {1800000, 1780000, 1760000, 1740000, 1720000, |
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1700000, 1680000, 1660000, 1800000, 1820000, |
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1840000, 1860000, 1880000, 1900000, 1920000, |
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1940000}; |
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static int voutl1_volt_table[] = {2500000, 2540000, 2580000, 2620000, 2660000, |
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2700000, 2740000, 2780000, 2500000, 2460000, |
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2420000, 2380000, 2340000, 2300000, 2260000, |
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2220000}; |
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struct bd957x_regulator_data { |
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struct regulator_desc desc; |
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int base_voltage; |
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}; |
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static int bd957x_vout34_list_voltage(struct regulator_dev *rdev, |
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unsigned int selector) |
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{ |
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const struct regulator_desc *desc = rdev->desc; |
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int multiplier = selector & desc->vsel_mask & 0x7f; |
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int tune; |
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/* VOUT3 and 4 has 10mV step */ |
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tune = multiplier * 10000; |
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if (!(selector & 0x80)) |
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return desc->fixed_uV - tune; |
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return desc->fixed_uV + tune; |
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} |
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static int bd957x_list_voltage(struct regulator_dev *rdev, |
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unsigned int selector) |
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{ |
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const struct regulator_desc *desc = rdev->desc; |
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int index = selector & desc->vsel_mask & 0x7f; |
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if (!(selector & 0x80)) |
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index += desc->n_voltages/2; |
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if (index >= desc->n_voltages) |
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return -EINVAL; |
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return desc->volt_table[index]; |
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} |
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static const struct regulator_ops bd957x_vout34_ops = { |
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.is_enabled = regulator_is_enabled_regmap, |
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.list_voltage = bd957x_vout34_list_voltage, |
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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 bd957X_vouts1_regulator_ops = { |
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.is_enabled = regulator_is_enabled_regmap, |
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}; |
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static const struct regulator_ops bd957x_ops = { |
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.is_enabled = regulator_is_enabled_regmap, |
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.list_voltage = bd957x_list_voltage, |
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.get_voltage_sel = regulator_get_voltage_sel_regmap, |
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}; |
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static struct bd957x_regulator_data bd9576_regulators[] = { |
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{ |
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.desc = { |
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.name = "VD50", |
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.of_match = of_match_ptr("regulator-vd50"), |
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.regulators_node = of_match_ptr("regulators"), |
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.id = BD957X_VD50, |
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.type = REGULATOR_VOLTAGE, |
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.ops = &bd957x_ops, |
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.volt_table = &vout1_volt_table[0], |
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.n_voltages = ARRAY_SIZE(vout1_volt_table), |
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.vsel_reg = BD957X_REG_VOUT1_TUNE, |
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.vsel_mask = BD957X_MASK_VOUT1_TUNE, |
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.enable_reg = BD957X_REG_POW_TRIGGER1, |
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.enable_mask = BD957X_REGULATOR_EN_MASK, |
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.enable_val = BD957X_REGULATOR_DIS_VAL, |
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.enable_is_inverted = true, |
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.owner = THIS_MODULE, |
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}, |
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}, |
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{ |
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.desc = { |
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.name = "VD18", |
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.of_match = of_match_ptr("regulator-vd18"), |
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.regulators_node = of_match_ptr("regulators"), |
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.id = BD957X_VD18, |
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.type = REGULATOR_VOLTAGE, |
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.ops = &bd957x_ops, |
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.volt_table = &vout2_volt_table[0], |
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.n_voltages = ARRAY_SIZE(vout2_volt_table), |
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.vsel_reg = BD957X_REG_VOUT2_TUNE, |
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.vsel_mask = BD957X_MASK_VOUT2_TUNE, |
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.enable_reg = BD957X_REG_POW_TRIGGER2, |
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.enable_mask = BD957X_REGULATOR_EN_MASK, |
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.enable_val = BD957X_REGULATOR_DIS_VAL, |
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.enable_is_inverted = true, |
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.owner = THIS_MODULE, |
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}, |
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}, |
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{ |
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.desc = { |
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.name = "VDDDR", |
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.of_match = of_match_ptr("regulator-vdddr"), |
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.regulators_node = of_match_ptr("regulators"), |
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.id = BD957X_VDDDR, |
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.ops = &bd957x_vout34_ops, |
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.type = REGULATOR_VOLTAGE, |
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.n_voltages = BD957X_VOUTS34_NUM_VOLT, |
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.vsel_reg = BD957X_REG_VOUT3_TUNE, |
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.vsel_mask = BD957X_MASK_VOUT3_TUNE, |
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.enable_reg = BD957X_REG_POW_TRIGGER3, |
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.enable_mask = BD957X_REGULATOR_EN_MASK, |
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.enable_val = BD957X_REGULATOR_DIS_VAL, |
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.enable_is_inverted = true, |
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.owner = THIS_MODULE, |
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}, |
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}, |
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{ |
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.desc = { |
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.name = "VD10", |
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.of_match = of_match_ptr("regulator-vd10"), |
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.regulators_node = of_match_ptr("regulators"), |
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.id = BD957X_VD10, |
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.ops = &bd957x_vout34_ops, |
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.type = REGULATOR_VOLTAGE, |
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.fixed_uV = BD957X_VOUTS4_BASE_VOLT, |
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.n_voltages = BD957X_VOUTS34_NUM_VOLT, |
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.vsel_reg = BD957X_REG_VOUT4_TUNE, |
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.vsel_mask = BD957X_MASK_VOUT4_TUNE, |
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.enable_reg = BD957X_REG_POW_TRIGGER4, |
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.enable_mask = BD957X_REGULATOR_EN_MASK, |
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.enable_val = BD957X_REGULATOR_DIS_VAL, |
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.enable_is_inverted = true, |
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.owner = THIS_MODULE, |
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}, |
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}, |
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{ |
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.desc = { |
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.name = "VOUTL1", |
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.of_match = of_match_ptr("regulator-voutl1"), |
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.regulators_node = of_match_ptr("regulators"), |
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.id = BD957X_VOUTL1, |
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.ops = &bd957x_ops, |
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.type = REGULATOR_VOLTAGE, |
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.volt_table = &voutl1_volt_table[0], |
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.n_voltages = ARRAY_SIZE(voutl1_volt_table), |
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.vsel_reg = BD957X_REG_VOUTL1_TUNE, |
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.vsel_mask = BD957X_MASK_VOUTL1_TUNE, |
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.enable_reg = BD957X_REG_POW_TRIGGERL1, |
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.enable_mask = BD957X_REGULATOR_EN_MASK, |
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.enable_val = BD957X_REGULATOR_DIS_VAL, |
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.enable_is_inverted = true, |
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.owner = THIS_MODULE, |
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}, |
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}, |
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{ |
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.desc = { |
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.name = "VOUTS1", |
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.of_match = of_match_ptr("regulator-vouts1"), |
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.regulators_node = of_match_ptr("regulators"), |
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.id = BD957X_VOUTS1, |
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.ops = &bd957X_vouts1_regulator_ops, |
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.type = REGULATOR_VOLTAGE, |
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.n_voltages = 1, |
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.fixed_uV = BD957X_VOUTS1_VOLT, |
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.enable_reg = BD957X_REG_POW_TRIGGERS1, |
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.enable_mask = BD957X_REGULATOR_EN_MASK, |
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.enable_val = BD957X_REGULATOR_DIS_VAL, |
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.enable_is_inverted = true, |
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.owner = THIS_MODULE, |
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}, |
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}, |
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}; |
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static int bd957x_probe(struct platform_device *pdev) |
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{ |
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struct regmap *regmap; |
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struct regulator_config config = { 0 }; |
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int i; |
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bool vout_mode, ddr_sel; |
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const struct bd957x_regulator_data *reg_data = &bd9576_regulators[0]; |
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unsigned int num_reg_data = ARRAY_SIZE(bd9576_regulators); |
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enum rohm_chip_type chip = platform_get_device_id(pdev)->driver_data; |
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regmap = dev_get_regmap(pdev->dev.parent, NULL); |
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if (!regmap) { |
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dev_err(&pdev->dev, "No regmap\n"); |
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return -EINVAL; |
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} |
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vout_mode = of_property_read_bool(pdev->dev.parent->of_node, |
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"rohm,vout1-en-low"); |
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if (vout_mode) { |
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struct gpio_desc *en; |
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dev_dbg(&pdev->dev, "GPIO controlled mode\n"); |
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/* VOUT1 enable state judged by VOUT1_EN pin */ |
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/* See if we have GPIO defined */ |
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en = devm_gpiod_get_from_of_node(&pdev->dev, |
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pdev->dev.parent->of_node, |
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"rohm,vout1-en-gpios", 0, |
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GPIOD_OUT_LOW, "vout1-en"); |
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if (!IS_ERR(en)) { |
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/* VOUT1_OPS gpio ctrl */ |
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/* |
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* Regulator core prioritizes the ena_gpio over |
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* enable/disable/is_enabled callbacks so no need to |
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* clear them. We can still use same ops |
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*/ |
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config.ena_gpiod = en; |
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} else { |
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/* |
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* In theory it is possible someone wants to set |
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* vout1-en LOW during OTP loading and set VOUT1 to be |
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* controlled by GPIO - but control the GPIO from some |
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* where else than this driver. For that to work we |
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* should unset the is_enabled callback here. |
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* |
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* I believe such case where rohm,vout1-en-low is set |
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* and vout1-en-gpios is not is likely to be a |
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* misconfiguration. So let's just err out for now. |
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*/ |
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dev_err(&pdev->dev, |
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"Failed to get VOUT1 control GPIO\n"); |
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return PTR_ERR(en); |
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} |
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} |
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/* |
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* If more than one PMIC needs to be controlled by same processor then |
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* allocate the regulator data array here and use bd9576_regulators as |
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* template. At the moment I see no such use-case so I spare some |
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* bytes and use bd9576_regulators directly for non-constant configs |
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* like DDR voltage selection. |
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*/ |
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ddr_sel = of_property_read_bool(pdev->dev.parent->of_node, |
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"rohm,ddr-sel-low"); |
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if (ddr_sel) |
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bd9576_regulators[2].desc.fixed_uV = 1350000; |
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else |
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bd9576_regulators[2].desc.fixed_uV = 1500000; |
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switch (chip) { |
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case ROHM_CHIP_TYPE_BD9576: |
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dev_dbg(&pdev->dev, "Found BD9576MUF\n"); |
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break; |
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case ROHM_CHIP_TYPE_BD9573: |
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dev_dbg(&pdev->dev, "Found BD9573MUF\n"); |
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break; |
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default: |
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dev_err(&pdev->dev, "Unsupported chip type\n"); |
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return -EINVAL; |
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} |
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config.dev = pdev->dev.parent; |
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config.regmap = regmap; |
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for (i = 0; i < num_reg_data; i++) { |
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const struct regulator_desc *desc; |
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struct regulator_dev *rdev; |
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const struct bd957x_regulator_data *r; |
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r = ®_data[i]; |
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desc = &r->desc; |
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rdev = devm_regulator_register(&pdev->dev, desc, &config); |
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if (IS_ERR(rdev)) { |
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dev_err(&pdev->dev, |
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"failed to register %s regulator\n", |
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desc->name); |
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return PTR_ERR(rdev); |
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} |
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/* |
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* Clear the VOUT1 GPIO setting - rest of the regulators do not |
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* support GPIO control |
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*/ |
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config.ena_gpiod = NULL; |
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} |
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return 0; |
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} |
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static const struct platform_device_id bd957x_pmic_id[] = { |
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{ "bd9573-pmic", ROHM_CHIP_TYPE_BD9573 }, |
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{ "bd9576-pmic", ROHM_CHIP_TYPE_BD9576 }, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(platform, bd957x_pmic_id); |
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static struct platform_driver bd957x_regulator = { |
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.driver = { |
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.name = "bd957x-pmic", |
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}, |
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.probe = bd957x_probe, |
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.id_table = bd957x_pmic_id, |
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}; |
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module_platform_driver(bd957x_regulator); |
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MODULE_AUTHOR("Matti Vaittinen <[email protected]>"); |
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MODULE_DESCRIPTION("ROHM BD9576/BD9573 voltage regulator driver"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:bd957x-pmic");
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