1910adc0eSFabio Estevam // SPDX-License-Identifier: GPL-2.0 2910adc0eSFabio Estevam // 3910adc0eSFabio Estevam // Regulator Driver for Freescale MC13xxx PMIC 4910adc0eSFabio Estevam // 5910adc0eSFabio Estevam // Copyright 2010 Yong Shen <yong.shen@linaro.org> 6910adc0eSFabio Estevam // 7910adc0eSFabio Estevam // Based on mc13783 regulator driver : 8910adc0eSFabio Estevam // Copyright (C) 2008 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de> 9910adc0eSFabio Estevam // Copyright 2009 Alberto Panizzo <maramaopercheseimorto@gmail.com> 10910adc0eSFabio Estevam // 11910adc0eSFabio Estevam // Regs infos taken from mc13xxx drivers from freescale and mc13xxx.pdf file 12910adc0eSFabio Estevam // from freescale 13167e3d8aSYong Shen 14167e3d8aSYong Shen #include <linux/mfd/mc13xxx.h> 15167e3d8aSYong Shen #include <linux/regulator/machine.h> 16167e3d8aSYong Shen #include <linux/regulator/driver.h> 1793bcb23bSShawn Guo #include <linux/regulator/of_regulator.h> 18167e3d8aSYong Shen #include <linux/platform_device.h> 19167e3d8aSYong Shen #include <linux/kernel.h> 20167e3d8aSYong Shen #include <linux/slab.h> 21167e3d8aSYong Shen #include <linux/init.h> 22167e3d8aSYong Shen #include <linux/err.h> 2365602c32SPaul Gortmaker #include <linux/module.h> 2493bcb23bSShawn Guo #include <linux/of.h> 25167e3d8aSYong Shen #include "mc13xxx.h" 26167e3d8aSYong Shen 27167e3d8aSYong Shen static int mc13xxx_regulator_enable(struct regulator_dev *rdev) 28167e3d8aSYong Shen { 29167e3d8aSYong Shen struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); 30167e3d8aSYong Shen struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; 31167e3d8aSYong Shen int id = rdev_get_id(rdev); 32167e3d8aSYong Shen 33167e3d8aSYong Shen dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id); 34167e3d8aSYong Shen 357dd33c1dSAlexander Shiyan return mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg, 36167e3d8aSYong Shen mc13xxx_regulators[id].enable_bit, 37167e3d8aSYong Shen mc13xxx_regulators[id].enable_bit); 38167e3d8aSYong Shen } 39167e3d8aSYong Shen 40167e3d8aSYong Shen static int mc13xxx_regulator_disable(struct regulator_dev *rdev) 41167e3d8aSYong Shen { 42167e3d8aSYong Shen struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); 43167e3d8aSYong Shen struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; 44167e3d8aSYong Shen int id = rdev_get_id(rdev); 45167e3d8aSYong Shen 46167e3d8aSYong Shen dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id); 47167e3d8aSYong Shen 487dd33c1dSAlexander Shiyan return mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg, 49167e3d8aSYong Shen mc13xxx_regulators[id].enable_bit, 0); 50167e3d8aSYong Shen } 51167e3d8aSYong Shen 52167e3d8aSYong Shen static int mc13xxx_regulator_is_enabled(struct regulator_dev *rdev) 53167e3d8aSYong Shen { 54167e3d8aSYong Shen struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); 55167e3d8aSYong Shen struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; 56167e3d8aSYong Shen int ret, id = rdev_get_id(rdev); 57167e3d8aSYong Shen unsigned int val; 58167e3d8aSYong Shen 59167e3d8aSYong Shen ret = mc13xxx_reg_read(priv->mc13xxx, mc13xxx_regulators[id].reg, &val); 60167e3d8aSYong Shen if (ret) 61167e3d8aSYong Shen return ret; 62167e3d8aSYong Shen 63167e3d8aSYong Shen return (val & mc13xxx_regulators[id].enable_bit) != 0; 64167e3d8aSYong Shen } 65167e3d8aSYong Shen 66939b62d8SAxel Lin static int mc13xxx_regulator_set_voltage_sel(struct regulator_dev *rdev, 67939b62d8SAxel Lin unsigned selector) 68167e3d8aSYong Shen { 69167e3d8aSYong Shen struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); 70167e3d8aSYong Shen struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; 71939b62d8SAxel Lin int id = rdev_get_id(rdev); 72167e3d8aSYong Shen 737dd33c1dSAlexander Shiyan return mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].vsel_reg, 74167e3d8aSYong Shen mc13xxx_regulators[id].vsel_mask, 75939b62d8SAxel Lin selector << mc13xxx_regulators[id].vsel_shift); 76167e3d8aSYong Shen } 77167e3d8aSYong Shen 78167e3d8aSYong Shen static int mc13xxx_regulator_get_voltage(struct regulator_dev *rdev) 79167e3d8aSYong Shen { 80167e3d8aSYong Shen struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); 81167e3d8aSYong Shen struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; 82167e3d8aSYong Shen int ret, id = rdev_get_id(rdev); 83167e3d8aSYong Shen unsigned int val; 84167e3d8aSYong Shen 85167e3d8aSYong Shen dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id); 86167e3d8aSYong Shen 87167e3d8aSYong Shen ret = mc13xxx_reg_read(priv->mc13xxx, 88167e3d8aSYong Shen mc13xxx_regulators[id].vsel_reg, &val); 89167e3d8aSYong Shen if (ret) 90167e3d8aSYong Shen return ret; 91167e3d8aSYong Shen 92167e3d8aSYong Shen val = (val & mc13xxx_regulators[id].vsel_mask) 93167e3d8aSYong Shen >> mc13xxx_regulators[id].vsel_shift; 94167e3d8aSYong Shen 95167e3d8aSYong Shen dev_dbg(rdev_get_dev(rdev), "%s id: %d val: %d\n", __func__, id, val); 96167e3d8aSYong Shen 973c24019dSAxel Lin BUG_ON(val >= mc13xxx_regulators[id].desc.n_voltages); 98167e3d8aSYong Shen 9934e74f39SAxel Lin return rdev->desc->volt_table[val]; 100167e3d8aSYong Shen } 101167e3d8aSYong Shen 102167e3d8aSYong Shen struct regulator_ops mc13xxx_regulator_ops = { 103167e3d8aSYong Shen .enable = mc13xxx_regulator_enable, 104167e3d8aSYong Shen .disable = mc13xxx_regulator_disable, 105167e3d8aSYong Shen .is_enabled = mc13xxx_regulator_is_enabled, 10634e74f39SAxel Lin .list_voltage = regulator_list_voltage_table, 107939b62d8SAxel Lin .set_voltage_sel = mc13xxx_regulator_set_voltage_sel, 108167e3d8aSYong Shen .get_voltage = mc13xxx_regulator_get_voltage, 109167e3d8aSYong Shen }; 1104d7071f1SMark Brown EXPORT_SYMBOL_GPL(mc13xxx_regulator_ops); 111167e3d8aSYong Shen 112167e3d8aSYong Shen int mc13xxx_fixed_regulator_set_voltage(struct regulator_dev *rdev, int min_uV, 113167e3d8aSYong Shen int max_uV, unsigned *selector) 114167e3d8aSYong Shen { 115167e3d8aSYong Shen int id = rdev_get_id(rdev); 116167e3d8aSYong Shen 117167e3d8aSYong Shen dev_dbg(rdev_get_dev(rdev), "%s id: %d min_uV: %d max_uV: %d\n", 118167e3d8aSYong Shen __func__, id, min_uV, max_uV); 119167e3d8aSYong Shen 12034e74f39SAxel Lin if (min_uV <= rdev->desc->volt_table[0] && 12113407ea8SAxel Lin rdev->desc->volt_table[0] <= max_uV) { 12213407ea8SAxel Lin *selector = 0; 123167e3d8aSYong Shen return 0; 12413407ea8SAxel Lin } else { 125167e3d8aSYong Shen return -EINVAL; 126167e3d8aSYong Shen } 12713407ea8SAxel Lin } 1284d7071f1SMark Brown EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_set_voltage); 129167e3d8aSYong Shen 130167e3d8aSYong Shen struct regulator_ops mc13xxx_fixed_regulator_ops = { 131167e3d8aSYong Shen .enable = mc13xxx_regulator_enable, 132167e3d8aSYong Shen .disable = mc13xxx_regulator_disable, 133167e3d8aSYong Shen .is_enabled = mc13xxx_regulator_is_enabled, 13434e74f39SAxel Lin .list_voltage = regulator_list_voltage_table, 135167e3d8aSYong Shen .set_voltage = mc13xxx_fixed_regulator_set_voltage, 136167e3d8aSYong Shen }; 1374d7071f1SMark Brown EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_ops); 138167e3d8aSYong Shen 13993bcb23bSShawn Guo #ifdef CONFIG_OF 140a5023574SBill Pemberton int mc13xxx_get_num_regulators_dt(struct platform_device *pdev) 14193bcb23bSShawn Guo { 14286f66733SAxel Lin struct device_node *parent; 14386f66733SAxel Lin int num; 14493bcb23bSShawn Guo 145b431e69aSAlexander Shiyan if (!pdev->dev.parent->of_node) 146bf7f882bSSachin Kamat return -ENODEV; 147bf7f882bSSachin Kamat 148b431e69aSAlexander Shiyan parent = of_get_child_by_name(pdev->dev.parent->of_node, "regulators"); 14993bcb23bSShawn Guo if (!parent) 15093bcb23bSShawn Guo return -ENODEV; 15193bcb23bSShawn Guo 15286f66733SAxel Lin num = of_get_child_count(parent); 153c92f5dd2SAxel Lin of_node_put(parent); 15493bcb23bSShawn Guo return num; 15593bcb23bSShawn Guo } 15653269163SDavid Miller EXPORT_SYMBOL_GPL(mc13xxx_get_num_regulators_dt); 15793bcb23bSShawn Guo 158a5023574SBill Pemberton struct mc13xxx_regulator_init_data *mc13xxx_parse_regulators_dt( 15993bcb23bSShawn Guo struct platform_device *pdev, struct mc13xxx_regulator *regulators, 160eb0d8e7aSAlexander Shiyan int num_regulators) 16193bcb23bSShawn Guo { 16293bcb23bSShawn Guo struct mc13xxx_regulator_priv *priv = platform_get_drvdata(pdev); 16393bcb23bSShawn Guo struct mc13xxx_regulator_init_data *data, *p; 16493bcb23bSShawn Guo struct device_node *parent, *child; 1652c8a5dcaSMatt Sealey int i, parsed = 0; 1662c8a5dcaSMatt Sealey 167b431e69aSAlexander Shiyan if (!pdev->dev.parent->of_node) 168bf7f882bSSachin Kamat return NULL; 169bf7f882bSSachin Kamat 170b431e69aSAlexander Shiyan parent = of_get_child_by_name(pdev->dev.parent->of_node, "regulators"); 17193bcb23bSShawn Guo if (!parent) 17293bcb23bSShawn Guo return NULL; 17393bcb23bSShawn Guo 17493bcb23bSShawn Guo data = devm_kzalloc(&pdev->dev, sizeof(*data) * priv->num_regulators, 17593bcb23bSShawn Guo GFP_KERNEL); 176c92f5dd2SAxel Lin if (!data) { 177c92f5dd2SAxel Lin of_node_put(parent); 17893bcb23bSShawn Guo return NULL; 179c92f5dd2SAxel Lin } 180c92f5dd2SAxel Lin 18193bcb23bSShawn Guo p = data; 18293bcb23bSShawn Guo 18393bcb23bSShawn Guo for_each_child_of_node(parent, child) { 184eb0d8e7aSAlexander Shiyan int found = 0; 185eb0d8e7aSAlexander Shiyan 18693bcb23bSShawn Guo for (i = 0; i < num_regulators; i++) { 187eb0d8e7aSAlexander Shiyan if (!regulators[i].desc.name) 188eb0d8e7aSAlexander Shiyan continue; 18993bcb23bSShawn Guo if (!of_node_cmp(child->name, 19093bcb23bSShawn Guo regulators[i].desc.name)) { 19193bcb23bSShawn Guo p->id = i; 19293bcb23bSShawn Guo p->init_data = of_get_regulator_init_data( 193072e78b1SJavier Martinez Canillas &pdev->dev, child, 194072e78b1SJavier Martinez Canillas ®ulators[i].desc); 19593bcb23bSShawn Guo p->node = child; 19693bcb23bSShawn Guo p++; 1972c8a5dcaSMatt Sealey 1982c8a5dcaSMatt Sealey parsed++; 199eb0d8e7aSAlexander Shiyan found = 1; 20093bcb23bSShawn Guo break; 20193bcb23bSShawn Guo } 20293bcb23bSShawn Guo } 203eb0d8e7aSAlexander Shiyan 204eb0d8e7aSAlexander Shiyan if (!found) 205eb0d8e7aSAlexander Shiyan dev_warn(&pdev->dev, 206eb0d8e7aSAlexander Shiyan "Unknown regulator: %s\n", child->name); 20793bcb23bSShawn Guo } 208c92f5dd2SAxel Lin of_node_put(parent); 20993bcb23bSShawn Guo 210eb0d8e7aSAlexander Shiyan priv->num_regulators = parsed; 211eb0d8e7aSAlexander Shiyan 21293bcb23bSShawn Guo return data; 21393bcb23bSShawn Guo } 21453269163SDavid Miller EXPORT_SYMBOL_GPL(mc13xxx_parse_regulators_dt); 21593bcb23bSShawn Guo #endif 21693bcb23bSShawn Guo 217167e3d8aSYong Shen MODULE_LICENSE("GPL v2"); 218167e3d8aSYong Shen MODULE_AUTHOR("Yong Shen <yong.shen@linaro.org>"); 219167e3d8aSYong Shen MODULE_DESCRIPTION("Regulator Driver for Freescale MC13xxx PMIC"); 220167e3d8aSYong Shen MODULE_ALIAS("mc13xxx-regulator-core"); 221