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359 lines
9.0 KiB
359 lines
9.0 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* fixed.c |
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* |
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* Copyright 2008 Wolfson Microelectronics PLC. |
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* |
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* Author: Mark Brown <[email protected]> |
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* |
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* Copyright (c) 2009 Nokia Corporation |
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* Roger Quadros <[email protected]> |
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* |
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* This is useful for systems with mixed controllable and |
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* non-controllable regulators, as well as for allowing testing on |
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* systems with no controllable regulators. |
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*/ |
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#include <linux/err.h> |
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#include <linux/mutex.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/pm_domain.h> |
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#include <linux/pm_opp.h> |
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#include <linux/regulator/driver.h> |
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#include <linux/regulator/fixed.h> |
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#include <linux/gpio/consumer.h> |
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#include <linux/slab.h> |
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#include <linux/of.h> |
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#include <linux/of_device.h> |
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#include <linux/regulator/of_regulator.h> |
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#include <linux/regulator/machine.h> |
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#include <linux/clk.h> |
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struct fixed_voltage_data { |
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struct regulator_desc desc; |
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struct regulator_dev *dev; |
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struct clk *enable_clock; |
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unsigned int enable_counter; |
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int performance_state; |
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}; |
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struct fixed_dev_type { |
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bool has_enable_clock; |
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bool has_performance_state; |
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}; |
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static int reg_clock_enable(struct regulator_dev *rdev) |
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{ |
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struct fixed_voltage_data *priv = rdev_get_drvdata(rdev); |
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int ret = 0; |
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ret = clk_prepare_enable(priv->enable_clock); |
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if (ret) |
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return ret; |
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priv->enable_counter++; |
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return ret; |
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} |
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static int reg_clock_disable(struct regulator_dev *rdev) |
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{ |
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struct fixed_voltage_data *priv = rdev_get_drvdata(rdev); |
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clk_disable_unprepare(priv->enable_clock); |
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priv->enable_counter--; |
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return 0; |
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} |
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static int reg_domain_enable(struct regulator_dev *rdev) |
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{ |
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struct fixed_voltage_data *priv = rdev_get_drvdata(rdev); |
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struct device *dev = rdev->dev.parent; |
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int ret; |
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ret = dev_pm_genpd_set_performance_state(dev, priv->performance_state); |
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if (ret) |
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return ret; |
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priv->enable_counter++; |
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return ret; |
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} |
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static int reg_domain_disable(struct regulator_dev *rdev) |
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{ |
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struct fixed_voltage_data *priv = rdev_get_drvdata(rdev); |
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struct device *dev = rdev->dev.parent; |
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int ret; |
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ret = dev_pm_genpd_set_performance_state(dev, 0); |
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if (ret) |
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return ret; |
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priv->enable_counter--; |
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return 0; |
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} |
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static int reg_is_enabled(struct regulator_dev *rdev) |
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{ |
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struct fixed_voltage_data *priv = rdev_get_drvdata(rdev); |
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return priv->enable_counter > 0; |
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} |
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/** |
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* of_get_fixed_voltage_config - extract fixed_voltage_config structure info |
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* @dev: device requesting for fixed_voltage_config |
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* @desc: regulator description |
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* |
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* Populates fixed_voltage_config structure by extracting data from device |
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* tree node, returns a pointer to the populated structure of NULL if memory |
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* alloc fails. |
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*/ |
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static struct fixed_voltage_config * |
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of_get_fixed_voltage_config(struct device *dev, |
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const struct regulator_desc *desc) |
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{ |
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struct fixed_voltage_config *config; |
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struct device_node *np = dev->of_node; |
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struct regulator_init_data *init_data; |
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config = devm_kzalloc(dev, sizeof(struct fixed_voltage_config), |
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GFP_KERNEL); |
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if (!config) |
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return ERR_PTR(-ENOMEM); |
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config->init_data = of_get_regulator_init_data(dev, dev->of_node, desc); |
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if (!config->init_data) |
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return ERR_PTR(-EINVAL); |
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init_data = config->init_data; |
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init_data->constraints.apply_uV = 0; |
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config->supply_name = init_data->constraints.name; |
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if (init_data->constraints.min_uV == init_data->constraints.max_uV) { |
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config->microvolts = init_data->constraints.min_uV; |
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} else { |
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dev_err(dev, |
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"Fixed regulator specified with variable voltages\n"); |
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return ERR_PTR(-EINVAL); |
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} |
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if (init_data->constraints.boot_on) |
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config->enabled_at_boot = true; |
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of_property_read_u32(np, "startup-delay-us", &config->startup_delay); |
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of_property_read_u32(np, "off-on-delay-us", &config->off_on_delay); |
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if (of_find_property(np, "vin-supply", NULL)) |
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config->input_supply = "vin"; |
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return config; |
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} |
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static const struct regulator_ops fixed_voltage_ops = { |
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}; |
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static const struct regulator_ops fixed_voltage_clkenabled_ops = { |
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.enable = reg_clock_enable, |
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.disable = reg_clock_disable, |
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.is_enabled = reg_is_enabled, |
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}; |
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static const struct regulator_ops fixed_voltage_domain_ops = { |
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.enable = reg_domain_enable, |
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.disable = reg_domain_disable, |
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.is_enabled = reg_is_enabled, |
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}; |
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static int reg_fixed_voltage_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct fixed_voltage_config *config; |
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struct fixed_voltage_data *drvdata; |
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const struct fixed_dev_type *drvtype = of_device_get_match_data(dev); |
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struct regulator_config cfg = { }; |
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enum gpiod_flags gflags; |
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int ret; |
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drvdata = devm_kzalloc(&pdev->dev, sizeof(struct fixed_voltage_data), |
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GFP_KERNEL); |
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if (!drvdata) |
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return -ENOMEM; |
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if (pdev->dev.of_node) { |
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config = of_get_fixed_voltage_config(&pdev->dev, |
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&drvdata->desc); |
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if (IS_ERR(config)) |
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return PTR_ERR(config); |
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} else { |
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config = dev_get_platdata(&pdev->dev); |
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} |
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if (!config) |
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return -ENOMEM; |
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drvdata->desc.name = devm_kstrdup(&pdev->dev, |
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config->supply_name, |
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GFP_KERNEL); |
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if (drvdata->desc.name == NULL) { |
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dev_err(&pdev->dev, "Failed to allocate supply name\n"); |
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return -ENOMEM; |
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} |
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drvdata->desc.type = REGULATOR_VOLTAGE; |
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drvdata->desc.owner = THIS_MODULE; |
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if (drvtype && drvtype->has_enable_clock) { |
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drvdata->desc.ops = &fixed_voltage_clkenabled_ops; |
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drvdata->enable_clock = devm_clk_get(dev, NULL); |
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if (IS_ERR(drvdata->enable_clock)) { |
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dev_err(dev, "Can't get enable-clock from devicetree\n"); |
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return -ENOENT; |
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} |
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} else if (drvtype && drvtype->has_performance_state) { |
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drvdata->desc.ops = &fixed_voltage_domain_ops; |
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drvdata->performance_state = of_get_required_opp_performance_state(dev->of_node, 0); |
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if (drvdata->performance_state < 0) { |
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dev_err(dev, "Can't get performance state from devicetree\n"); |
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return drvdata->performance_state; |
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} |
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} else { |
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drvdata->desc.ops = &fixed_voltage_ops; |
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} |
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drvdata->desc.enable_time = config->startup_delay; |
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drvdata->desc.off_on_delay = config->off_on_delay; |
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if (config->input_supply) { |
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drvdata->desc.supply_name = devm_kstrdup(&pdev->dev, |
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config->input_supply, |
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GFP_KERNEL); |
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if (!drvdata->desc.supply_name) { |
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dev_err(&pdev->dev, |
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"Failed to allocate input supply\n"); |
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return -ENOMEM; |
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} |
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} |
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if (config->microvolts) |
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drvdata->desc.n_voltages = 1; |
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drvdata->desc.fixed_uV = config->microvolts; |
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/* |
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* The signal will be inverted by the GPIO core if flagged so in the |
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* descriptor. |
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*/ |
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if (config->enabled_at_boot) |
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gflags = GPIOD_OUT_HIGH; |
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else |
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gflags = GPIOD_OUT_LOW; |
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/* |
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* Some fixed regulators share the enable line between two |
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* regulators which makes it necessary to get a handle on the |
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* same descriptor for two different consumers. This will get |
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* the GPIO descriptor, but only the first call will initialize |
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* it so any flags such as inversion or open drain will only |
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* be set up by the first caller and assumed identical on the |
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* next caller. |
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* |
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* FIXME: find a better way to deal with this. |
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*/ |
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gflags |= GPIOD_FLAGS_BIT_NONEXCLUSIVE; |
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/* |
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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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cfg.ena_gpiod = gpiod_get_optional(&pdev->dev, NULL, gflags); |
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if (IS_ERR(cfg.ena_gpiod)) |
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return dev_err_probe(&pdev->dev, PTR_ERR(cfg.ena_gpiod), |
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"can't get GPIO\n"); |
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cfg.dev = &pdev->dev; |
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cfg.init_data = config->init_data; |
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cfg.driver_data = drvdata; |
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cfg.of_node = pdev->dev.of_node; |
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drvdata->dev = devm_regulator_register(&pdev->dev, &drvdata->desc, |
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&cfg); |
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if (IS_ERR(drvdata->dev)) { |
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ret = dev_err_probe(&pdev->dev, PTR_ERR(drvdata->dev), |
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"Failed to register regulator: %ld\n", |
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PTR_ERR(drvdata->dev)); |
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return ret; |
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} |
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platform_set_drvdata(pdev, drvdata); |
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dev_dbg(&pdev->dev, "%s supplying %duV\n", drvdata->desc.name, |
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drvdata->desc.fixed_uV); |
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return 0; |
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} |
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#if defined(CONFIG_OF) |
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static const struct fixed_dev_type fixed_voltage_data = { |
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.has_enable_clock = false, |
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}; |
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static const struct fixed_dev_type fixed_clkenable_data = { |
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.has_enable_clock = true, |
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}; |
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static const struct fixed_dev_type fixed_domain_data = { |
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.has_performance_state = true, |
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}; |
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static const struct of_device_id fixed_of_match[] = { |
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{ |
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.compatible = "regulator-fixed", |
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.data = &fixed_voltage_data, |
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}, |
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{ |
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.compatible = "regulator-fixed-clock", |
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.data = &fixed_clkenable_data, |
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}, |
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{ |
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.compatible = "regulator-fixed-domain", |
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.data = &fixed_domain_data, |
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}, |
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{ |
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}, |
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}; |
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MODULE_DEVICE_TABLE(of, fixed_of_match); |
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#endif |
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static struct platform_driver regulator_fixed_voltage_driver = { |
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.probe = reg_fixed_voltage_probe, |
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.driver = { |
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.name = "reg-fixed-voltage", |
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.of_match_table = of_match_ptr(fixed_of_match), |
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}, |
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}; |
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static int __init regulator_fixed_voltage_init(void) |
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{ |
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return platform_driver_register(®ulator_fixed_voltage_driver); |
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} |
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subsys_initcall(regulator_fixed_voltage_init); |
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static void __exit regulator_fixed_voltage_exit(void) |
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{ |
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platform_driver_unregister(®ulator_fixed_voltage_driver); |
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} |
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module_exit(regulator_fixed_voltage_exit); |
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MODULE_AUTHOR("Mark Brown <[email protected]>"); |
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MODULE_DESCRIPTION("Fixed voltage regulator"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:reg-fixed-voltage");
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