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