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259b93b21a
Probing of regulators can be a slow operation and can contribute to slower boot times. This is especially true if a regulator is turned on at probe time (with regulator-boot-on or regulator-always-on) and the regulator requires delays (off-on-time, ramp time, etc). While the overall kernel is not ready to switch to async probe by default, as per the discussion on the mailing lists [1] it is believed that the regulator subsystem is in good shape and we can move regulator drivers over wholesale. There is no way to just magically opt in all regulators (regulators are just normal drivers like platform_driver), so we set PROBE_PREFER_ASYNCHRONOUS for all regulators found in 'drivers/regulator' individually. Given the number of drivers touched and the impossibility to test this ahead of time, it wouldn't be shocking at all if this caused a regression for someone. If there is a regression caused by this patch, it's likely to be one of the cases talked about in [1]. As a "quick fix", drivers involved in the regression could be fixed by changing them to PROBE_FORCE_SYNCHRONOUS. That being said, the correct fix would be to directly fix the problem that caused the issue with async probe. The approach here follows a similar approach that was used for the mmc subsystem several years ago [2]. In fact, I ran nearly the same python script to auto-generate the changes. The only thing I changed was to search for "i2c_driver", "spmi_driver", and "spi_driver" in addition to "platform_driver". [1] https://lore.kernel.org/r/06db017f-e985-4434-8d1d-02ca2100cca0@sirena.org.uk [2] https://lore.kernel.org/r/20200903232441.2694866-1-dianders@chromium.org/ Signed-off-by: Douglas Anderson <dianders@chromium.org> Link: https://lore.kernel.org/r/20230316125351.1.I2a4677392a38db5758dee0788b2cea5872562a82@changeid Signed-off-by: Mark Brown <broonie@kernel.org>
277 lines
7.7 KiB
C
277 lines
7.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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//
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// Regulator support for WM8400
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//
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// Copyright 2008 Wolfson Microelectronics PLC.
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//
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// Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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#include <linux/bug.h>
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#include <linux/err.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/regulator/driver.h>
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#include <linux/mfd/wm8400-private.h>
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static const struct linear_range wm8400_ldo_ranges[] = {
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REGULATOR_LINEAR_RANGE(900000, 0, 14, 50000),
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REGULATOR_LINEAR_RANGE(1700000, 15, 31, 100000),
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};
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static const struct regulator_ops wm8400_ldo_ops = {
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.is_enabled = regulator_is_enabled_regmap,
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.enable = regulator_enable_regmap,
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.disable = regulator_disable_regmap,
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.list_voltage = regulator_list_voltage_linear_range,
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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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.map_voltage = regulator_map_voltage_linear_range,
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};
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static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev)
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{
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struct regmap *rmap = rdev_get_regmap(dev);
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int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
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u16 data[2];
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int ret;
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ret = regmap_bulk_read(rmap, WM8400_DCDC1_CONTROL_1 + offset, data, 2);
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if (ret != 0)
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return 0;
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/* Datasheet: hibernate */
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if (data[0] & WM8400_DC1_SLEEP)
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return REGULATOR_MODE_STANDBY;
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/* Datasheet: standby */
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if (!(data[0] & WM8400_DC1_ACTIVE))
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return REGULATOR_MODE_IDLE;
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/* Datasheet: active with or without force PWM */
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if (data[1] & WM8400_DC1_FRC_PWM)
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return REGULATOR_MODE_FAST;
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else
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return REGULATOR_MODE_NORMAL;
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}
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static int wm8400_dcdc_set_mode(struct regulator_dev *dev, unsigned int mode)
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{
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struct regmap *rmap = rdev_get_regmap(dev);
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int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
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int ret;
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switch (mode) {
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case REGULATOR_MODE_FAST:
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/* Datasheet: active with force PWM */
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ret = regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_2 + offset,
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WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM);
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if (ret != 0)
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return ret;
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return regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_1 + offset,
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WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
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WM8400_DC1_ACTIVE);
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case REGULATOR_MODE_NORMAL:
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/* Datasheet: active */
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ret = regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_2 + offset,
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WM8400_DC1_FRC_PWM, 0);
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if (ret != 0)
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return ret;
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return regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_1 + offset,
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WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
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WM8400_DC1_ACTIVE);
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case REGULATOR_MODE_IDLE:
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/* Datasheet: standby */
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return regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_1 + offset,
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WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, 0);
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default:
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return -EINVAL;
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}
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}
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static unsigned int wm8400_dcdc_get_optimum_mode(struct regulator_dev *dev,
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int input_uV, int output_uV,
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int load_uA)
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{
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return REGULATOR_MODE_NORMAL;
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}
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static const struct regulator_ops wm8400_dcdc_ops = {
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.is_enabled = regulator_is_enabled_regmap,
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.enable = regulator_enable_regmap,
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.disable = regulator_disable_regmap,
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.list_voltage = regulator_list_voltage_linear,
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.map_voltage = regulator_map_voltage_linear,
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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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.get_mode = wm8400_dcdc_get_mode,
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.set_mode = wm8400_dcdc_set_mode,
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.get_optimum_mode = wm8400_dcdc_get_optimum_mode,
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};
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static struct regulator_desc regulators[] = {
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{
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.name = "LDO1",
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.id = WM8400_LDO1,
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.ops = &wm8400_ldo_ops,
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.enable_reg = WM8400_LDO1_CONTROL,
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.enable_mask = WM8400_LDO1_ENA,
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.n_voltages = WM8400_LDO1_VSEL_MASK + 1,
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.linear_ranges = wm8400_ldo_ranges,
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.n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
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.vsel_reg = WM8400_LDO1_CONTROL,
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.vsel_mask = WM8400_LDO1_VSEL_MASK,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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},
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{
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.name = "LDO2",
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.id = WM8400_LDO2,
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.ops = &wm8400_ldo_ops,
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.enable_reg = WM8400_LDO2_CONTROL,
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.enable_mask = WM8400_LDO2_ENA,
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.n_voltages = WM8400_LDO2_VSEL_MASK + 1,
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.linear_ranges = wm8400_ldo_ranges,
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.n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
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.type = REGULATOR_VOLTAGE,
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.vsel_reg = WM8400_LDO2_CONTROL,
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.vsel_mask = WM8400_LDO2_VSEL_MASK,
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.owner = THIS_MODULE,
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},
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{
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.name = "LDO3",
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.id = WM8400_LDO3,
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.ops = &wm8400_ldo_ops,
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.enable_reg = WM8400_LDO3_CONTROL,
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.enable_mask = WM8400_LDO3_ENA,
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.n_voltages = WM8400_LDO3_VSEL_MASK + 1,
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.linear_ranges = wm8400_ldo_ranges,
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.n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
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.vsel_reg = WM8400_LDO3_CONTROL,
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.vsel_mask = WM8400_LDO3_VSEL_MASK,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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},
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{
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.name = "LDO4",
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.id = WM8400_LDO4,
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.ops = &wm8400_ldo_ops,
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.enable_reg = WM8400_LDO4_CONTROL,
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.enable_mask = WM8400_LDO4_ENA,
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.n_voltages = WM8400_LDO4_VSEL_MASK + 1,
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.linear_ranges = wm8400_ldo_ranges,
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.n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
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.vsel_reg = WM8400_LDO4_CONTROL,
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.vsel_mask = WM8400_LDO4_VSEL_MASK,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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},
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{
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.name = "DCDC1",
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.id = WM8400_DCDC1,
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.ops = &wm8400_dcdc_ops,
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.enable_reg = WM8400_DCDC1_CONTROL_1,
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.enable_mask = WM8400_DC1_ENA_MASK,
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.n_voltages = WM8400_DC1_VSEL_MASK + 1,
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.vsel_reg = WM8400_DCDC1_CONTROL_1,
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.vsel_mask = WM8400_DC1_VSEL_MASK,
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.min_uV = 850000,
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.uV_step = 25000,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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},
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{
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.name = "DCDC2",
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.id = WM8400_DCDC2,
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.ops = &wm8400_dcdc_ops,
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.enable_reg = WM8400_DCDC2_CONTROL_1,
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.enable_mask = WM8400_DC2_ENA_MASK,
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.n_voltages = WM8400_DC2_VSEL_MASK + 1,
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.vsel_reg = WM8400_DCDC2_CONTROL_1,
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.vsel_mask = WM8400_DC2_VSEL_MASK,
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.min_uV = 850000,
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.uV_step = 25000,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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},
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};
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static int wm8400_regulator_probe(struct platform_device *pdev)
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{
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struct wm8400 *wm8400 = container_of(pdev, struct wm8400, regulators[pdev->id]);
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struct regulator_config config = { };
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struct regulator_dev *rdev;
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config.dev = &pdev->dev;
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config.init_data = dev_get_platdata(&pdev->dev);
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config.driver_data = wm8400;
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config.regmap = wm8400->regmap;
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rdev = devm_regulator_register(&pdev->dev, ®ulators[pdev->id],
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&config);
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if (IS_ERR(rdev))
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return PTR_ERR(rdev);
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platform_set_drvdata(pdev, rdev);
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return 0;
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}
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static struct platform_driver wm8400_regulator_driver = {
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.driver = {
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.name = "wm8400-regulator",
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.probe_type = PROBE_PREFER_ASYNCHRONOUS,
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},
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.probe = wm8400_regulator_probe,
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};
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/**
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* wm8400_register_regulator - enable software control of a WM8400 regulator
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*
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* This function enables software control of a WM8400 regulator via
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* the regulator API. It is intended to be called from the
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* platform_init() callback of the WM8400 MFD driver.
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*
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* @dev: The WM8400 device to operate on.
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* @reg: The regulator to control.
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* @initdata: Regulator initdata for the regulator.
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*/
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int wm8400_register_regulator(struct device *dev, int reg,
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struct regulator_init_data *initdata)
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{
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struct wm8400 *wm8400 = dev_get_drvdata(dev);
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if (wm8400->regulators[reg].name)
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return -EBUSY;
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initdata->driver_data = wm8400;
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wm8400->regulators[reg].name = "wm8400-regulator";
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wm8400->regulators[reg].id = reg;
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wm8400->regulators[reg].dev.parent = dev;
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wm8400->regulators[reg].dev.platform_data = initdata;
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return platform_device_register(&wm8400->regulators[reg]);
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}
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EXPORT_SYMBOL_GPL(wm8400_register_regulator);
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static int __init wm8400_regulator_init(void)
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{
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return platform_driver_register(&wm8400_regulator_driver);
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}
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subsys_initcall(wm8400_regulator_init);
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static void __exit wm8400_regulator_exit(void)
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{
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platform_driver_unregister(&wm8400_regulator_driver);
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}
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module_exit(wm8400_regulator_exit);
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MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
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MODULE_DESCRIPTION("WM8400 regulator driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:wm8400-regulator");
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