1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Driver for regulators found in the SpacemiT P1 PMIC 4 * 5 * Copyright (C) 2025 by RISCstar Solutions Corporation. All rights reserved. 6 * Derived from code from SpacemiT. 7 * Copyright (c) 2023, SPACEMIT Co., Ltd 8 */ 9 10 #include <linux/array_size.h> 11 #include <linux/bits.h> 12 #include <linux/device.h> 13 #include <linux/linear_range.h> 14 #include <linux/module.h> 15 #include <linux/of.h> 16 #include <linux/platform_device.h> 17 #include <linux/regulator/driver.h> 18 19 #define MOD_NAME "spacemit-p1-regulator" 20 21 enum p1_regulator_id { 22 P1_BUCK1, 23 P1_BUCK2, 24 P1_BUCK3, 25 P1_BUCK4, 26 P1_BUCK5, 27 P1_BUCK6, 28 29 P1_ALDO1, 30 P1_ALDO2, 31 P1_ALDO3, 32 P1_ALDO4, 33 34 P1_DLDO1, 35 P1_DLDO2, 36 P1_DLDO3, 37 P1_DLDO4, 38 P1_DLDO5, 39 P1_DLDO6, 40 P1_DLDO7, 41 }; 42 43 static const struct regulator_ops p1_regulator_ops = { 44 .list_voltage = regulator_list_voltage_linear_range, 45 .get_voltage_sel = regulator_get_voltage_sel_regmap, 46 .set_voltage_sel = regulator_set_voltage_sel_regmap, 47 .set_voltage_time_sel = regulator_set_voltage_time_sel, 48 .enable = regulator_enable_regmap, 49 .disable = regulator_disable_regmap, 50 .is_enabled = regulator_is_enabled_regmap, 51 }; 52 53 /* Selector value 255 can be used to disable the buck converter on sleep */ 54 static const struct linear_range p1_buck_ranges[] = { 55 REGULATOR_LINEAR_RANGE(500000, 0, 170, 5000), 56 REGULATOR_LINEAR_RANGE(1375000, 171, 254, 25000), 57 }; 58 59 /* Selector value 0 can be used for suspend */ 60 static const struct linear_range p1_ldo_ranges[] = { 61 REGULATOR_LINEAR_RANGE(500000, 11, 127, 25000), 62 }; 63 64 /* These define the voltage selector field for buck and LDO regulators */ 65 #define BUCK_MASK GENMASK(7, 0) 66 #define LDO_MASK GENMASK(6, 0) 67 68 #define P1_ID(_TYPE, _n) P1_ ## _TYPE ## _n 69 #define P1_ENABLE_REG(_off, _n) ((_off) + 3 * ((_n) - 1)) 70 71 #define P1_REG_DESC(_TYPE, _type, _n, _s, _off, _mask, _nv, _ranges) \ 72 { \ 73 .name = #_type #_n, \ 74 .supply_name = _s, \ 75 .of_match = of_match_ptr(#_type #_n), \ 76 .regulators_node = of_match_ptr("regulators"), \ 77 .id = P1_ID(_TYPE, _n), \ 78 .n_voltages = _nv, \ 79 .ops = &p1_regulator_ops, \ 80 .owner = THIS_MODULE, \ 81 .linear_ranges = _ranges, \ 82 .n_linear_ranges = ARRAY_SIZE(_ranges), \ 83 .vsel_reg = P1_ENABLE_REG(_off, _n) + 1, \ 84 .vsel_mask = _mask, \ 85 .enable_reg = P1_ENABLE_REG(_off, _n), \ 86 .enable_mask = BIT(0), \ 87 } 88 89 #define P1_BUCK_DESC(_n) \ 90 P1_REG_DESC(BUCK, buck, _n, "vcc", 0x47, BUCK_MASK, 254, p1_buck_ranges) 91 92 #define P1_ALDO_DESC(_n) \ 93 P1_REG_DESC(ALDO, aldo, _n, "vcc", 0x5b, LDO_MASK, 117, p1_ldo_ranges) 94 95 #define P1_DLDO_DESC(_n) \ 96 P1_REG_DESC(DLDO, dldo, _n, "buck5", 0x67, LDO_MASK, 117, p1_ldo_ranges) 97 98 static const struct regulator_desc p1_regulator_desc[] = { 99 P1_BUCK_DESC(1), 100 P1_BUCK_DESC(2), 101 P1_BUCK_DESC(3), 102 P1_BUCK_DESC(4), 103 P1_BUCK_DESC(5), 104 P1_BUCK_DESC(6), 105 106 P1_ALDO_DESC(1), 107 P1_ALDO_DESC(2), 108 P1_ALDO_DESC(3), 109 P1_ALDO_DESC(4), 110 111 P1_DLDO_DESC(1), 112 P1_DLDO_DESC(2), 113 P1_DLDO_DESC(3), 114 P1_DLDO_DESC(4), 115 P1_DLDO_DESC(5), 116 P1_DLDO_DESC(6), 117 P1_DLDO_DESC(7), 118 }; 119 120 static int p1_regulator_probe(struct platform_device *pdev) 121 { 122 struct regulator_config config = { }; 123 struct device *dev = &pdev->dev; 124 u32 i; 125 126 /* 127 * The parent device (PMIC) owns the regmap. Since we don't 128 * provide one in the config structure, that one will be used. 129 */ 130 config.dev = dev->parent; 131 132 for (i = 0; i < ARRAY_SIZE(p1_regulator_desc); i++) { 133 const struct regulator_desc *desc = &p1_regulator_desc[i]; 134 struct regulator_dev *rdev; 135 136 rdev = devm_regulator_register(dev, desc, &config); 137 if (IS_ERR(rdev)) 138 return dev_err_probe(dev, PTR_ERR(rdev), 139 "error registering regulator %s\n", 140 desc->name); 141 } 142 143 return 0; 144 } 145 146 static struct platform_driver p1_regulator_driver = { 147 .probe = p1_regulator_probe, 148 .driver = { 149 .name = MOD_NAME, 150 }, 151 }; 152 153 module_platform_driver(p1_regulator_driver); 154 155 MODULE_DESCRIPTION("SpacemiT P1 regulator driver"); 156 MODULE_LICENSE("GPL"); 157 MODULE_ALIAS("platform:" MOD_NAME); 158