1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Regulator driver for RICOH RC5T583 power management chip. 4 * 5 * Copyright (c) 2011-2012, NVIDIA CORPORATION. All rights reserved. 6 * Author: Laxman dewangan <ldewangan@nvidia.com> 7 * 8 * based on code 9 * Copyright (C) 2011 RICOH COMPANY,LTD 10 */ 11 12 #include <linux/module.h> 13 #include <linux/init.h> 14 #include <linux/slab.h> 15 #include <linux/err.h> 16 #include <linux/platform_device.h> 17 #include <linux/regulator/driver.h> 18 #include <linux/regulator/machine.h> 19 #include <linux/gpio.h> 20 #include <linux/mfd/rc5t583.h> 21 22 struct rc5t583_regulator_info { 23 int deepsleep_id; 24 25 /* Regulator register address.*/ 26 uint8_t reg_disc_reg; 27 uint8_t disc_bit; 28 uint8_t deepsleep_reg; 29 30 /* Regulator specific turn-on delay and voltage settling time*/ 31 int enable_uv_per_us; 32 33 /* Used by regulator core */ 34 struct regulator_desc desc; 35 }; 36 37 static int rc5t583_regulator_enable_time(struct regulator_dev *rdev) 38 { 39 struct rc5t583_regulator_info *reg_info = rdev_get_drvdata(rdev); 40 int vsel = regulator_get_voltage_sel_regmap(rdev); 41 int curr_uV = regulator_list_voltage_linear(rdev, vsel); 42 43 return DIV_ROUND_UP(curr_uV, reg_info->enable_uv_per_us); 44 } 45 46 static const struct regulator_ops rc5t583_ops = { 47 .is_enabled = regulator_is_enabled_regmap, 48 .enable = regulator_enable_regmap, 49 .disable = regulator_disable_regmap, 50 .enable_time = rc5t583_regulator_enable_time, 51 .get_voltage_sel = regulator_get_voltage_sel_regmap, 52 .set_voltage_sel = regulator_set_voltage_sel_regmap, 53 .list_voltage = regulator_list_voltage_linear, 54 .map_voltage = regulator_map_voltage_linear, 55 .set_voltage_time_sel = regulator_set_voltage_time_sel, 56 }; 57 58 #define RC5T583_REG(_id, _en_reg, _en_bit, _disc_reg, _disc_bit, \ 59 _vout_mask, _min_mv, _max_mv, _step_uV, _enable_mv) \ 60 { \ 61 .reg_disc_reg = RC5T583_REG_##_disc_reg, \ 62 .disc_bit = _disc_bit, \ 63 .deepsleep_reg = RC5T583_REG_##_id##DAC_DS, \ 64 .enable_uv_per_us = _enable_mv * 1000, \ 65 .deepsleep_id = RC5T583_DS_##_id, \ 66 .desc = { \ 67 .name = "rc5t583-regulator-"#_id, \ 68 .id = RC5T583_REGULATOR_##_id, \ 69 .n_voltages = (_max_mv - _min_mv) * 1000 / _step_uV + 1, \ 70 .ops = &rc5t583_ops, \ 71 .type = REGULATOR_VOLTAGE, \ 72 .owner = THIS_MODULE, \ 73 .vsel_reg = RC5T583_REG_##_id##DAC, \ 74 .vsel_mask = _vout_mask, \ 75 .enable_reg = RC5T583_REG_##_en_reg, \ 76 .enable_mask = BIT(_en_bit), \ 77 .min_uV = _min_mv * 1000, \ 78 .uV_step = _step_uV, \ 79 .ramp_delay = 40 * 1000, \ 80 }, \ 81 } 82 83 static struct rc5t583_regulator_info rc5t583_reg_info[RC5T583_REGULATOR_MAX] = { 84 RC5T583_REG(DC0, DC0CTL, 0, DC0CTL, 1, 0x7F, 700, 1500, 12500, 4), 85 RC5T583_REG(DC1, DC1CTL, 0, DC1CTL, 1, 0x7F, 700, 1500, 12500, 14), 86 RC5T583_REG(DC2, DC2CTL, 0, DC2CTL, 1, 0x7F, 900, 2400, 12500, 14), 87 RC5T583_REG(DC3, DC3CTL, 0, DC3CTL, 1, 0x7F, 900, 2400, 12500, 14), 88 RC5T583_REG(LDO0, LDOEN2, 0, LDODIS2, 0, 0x7F, 900, 3400, 25000, 160), 89 RC5T583_REG(LDO1, LDOEN2, 1, LDODIS2, 1, 0x7F, 900, 3400, 25000, 160), 90 RC5T583_REG(LDO2, LDOEN2, 2, LDODIS2, 2, 0x7F, 900, 3400, 25000, 160), 91 RC5T583_REG(LDO3, LDOEN2, 3, LDODIS2, 3, 0x7F, 900, 3400, 25000, 160), 92 RC5T583_REG(LDO4, LDOEN2, 4, LDODIS2, 4, 0x3F, 750, 1500, 12500, 133), 93 RC5T583_REG(LDO5, LDOEN2, 5, LDODIS2, 5, 0x7F, 900, 3400, 25000, 267), 94 RC5T583_REG(LDO6, LDOEN2, 6, LDODIS2, 6, 0x7F, 900, 3400, 25000, 133), 95 RC5T583_REG(LDO7, LDOEN2, 7, LDODIS2, 7, 0x7F, 900, 3400, 25000, 233), 96 RC5T583_REG(LDO8, LDOEN1, 0, LDODIS1, 0, 0x7F, 900, 3400, 25000, 233), 97 RC5T583_REG(LDO9, LDOEN1, 1, LDODIS1, 1, 0x7F, 900, 3400, 25000, 133), 98 }; 99 100 static int rc5t583_regulator_probe(struct platform_device *pdev) 101 { 102 struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent); 103 struct rc5t583_platform_data *pdata = dev_get_platdata(rc5t583->dev); 104 struct regulator_config config = { }; 105 struct regulator_dev *rdev; 106 struct rc5t583_regulator_info *ri; 107 int ret; 108 int id; 109 110 if (!pdata) { 111 dev_err(&pdev->dev, "No platform data, exiting...\n"); 112 return -ENODEV; 113 } 114 115 for (id = 0; id < RC5T583_REGULATOR_MAX; ++id) { 116 ri = &rc5t583_reg_info[id]; 117 118 if (ri->deepsleep_id == RC5T583_DS_NONE) 119 goto skip_ext_pwr_config; 120 121 ret = rc5t583_ext_power_req_config(rc5t583->dev, 122 ri->deepsleep_id, 123 pdata->regulator_ext_pwr_control[id], 124 pdata->regulator_deepsleep_slot[id]); 125 /* 126 * Configuring external control is not a major issue, 127 * just give warning. 128 */ 129 if (ret < 0) 130 dev_warn(&pdev->dev, 131 "Failed to configure ext control %d\n", id); 132 133 skip_ext_pwr_config: 134 config.dev = &pdev->dev; 135 config.init_data = pdata->reg_init_data[id]; 136 config.driver_data = ri; 137 config.regmap = rc5t583->regmap; 138 139 rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config); 140 if (IS_ERR(rdev)) { 141 dev_err(&pdev->dev, "Failed to register regulator %s\n", 142 ri->desc.name); 143 return PTR_ERR(rdev); 144 } 145 } 146 return 0; 147 } 148 149 static struct platform_driver rc5t583_regulator_driver = { 150 .driver = { 151 .name = "rc5t583-regulator", 152 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 153 }, 154 .probe = rc5t583_regulator_probe, 155 }; 156 157 static int __init rc5t583_regulator_init(void) 158 { 159 return platform_driver_register(&rc5t583_regulator_driver); 160 } 161 subsys_initcall(rc5t583_regulator_init); 162 163 static void __exit rc5t583_regulator_exit(void) 164 { 165 platform_driver_unregister(&rc5t583_regulator_driver); 166 } 167 module_exit(rc5t583_regulator_exit); 168 169 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); 170 MODULE_DESCRIPTION("RC5T583 regulator driver"); 171 MODULE_ALIAS("platform:rc5t583-regulator"); 172 MODULE_LICENSE("GPL v2"); 173