1 // SPDX-License-Identifier: GPL-2.0 2 // 3 // Regulator driver for TPS68470 PMIC 4 // 5 // Copyright (c) 2021 Red Hat Inc. 6 // Copyright (C) 2018 Intel Corporation 7 // 8 // Authors: 9 // Hans de Goede <hdegoede@redhat.com> 10 // Zaikuo Wang <zaikuo.wang@intel.com> 11 // Tianshu Qiu <tian.shu.qiu@intel.com> 12 // Jian Xu Zheng <jian.xu.zheng@intel.com> 13 // Yuning Pu <yuning.pu@intel.com> 14 // Rajmohan Mani <rajmohan.mani@intel.com> 15 16 #include <linux/clk.h> 17 #include <linux/device.h> 18 #include <linux/err.h> 19 #include <linux/init.h> 20 #include <linux/kernel.h> 21 #include <linux/mfd/tps68470.h> 22 #include <linux/module.h> 23 #include <linux/platform_data/tps68470.h> 24 #include <linux/platform_device.h> 25 #include <linux/regulator/driver.h> 26 #include <linux/regulator/machine.h> 27 28 struct tps68470_regulator_data { 29 struct clk *clk; 30 }; 31 32 #define TPS68470_REGULATOR(_name, _id, _ops, _n, \ 33 _vr, _vm, _er, _em, _lr, _nlr) \ 34 [TPS68470_ ## _name] = { \ 35 .name = # _name, \ 36 .id = _id, \ 37 .ops = &_ops, \ 38 .n_voltages = _n, \ 39 .type = REGULATOR_VOLTAGE, \ 40 .owner = THIS_MODULE, \ 41 .vsel_reg = _vr, \ 42 .vsel_mask = _vm, \ 43 .enable_reg = _er, \ 44 .enable_mask = _em, \ 45 .linear_ranges = _lr, \ 46 .n_linear_ranges = _nlr, \ 47 } 48 49 static const struct linear_range tps68470_ldo_ranges[] = { 50 REGULATOR_LINEAR_RANGE(875000, 0, 125, 17800), 51 }; 52 53 static const struct linear_range tps68470_core_ranges[] = { 54 REGULATOR_LINEAR_RANGE(900000, 0, 42, 25000), 55 }; 56 57 static int tps68470_regulator_enable(struct regulator_dev *rdev) 58 { 59 struct tps68470_regulator_data *data = rdev->reg_data; 60 int ret; 61 62 /* The Core buck regulator needs the PMIC's PLL to be enabled */ 63 if (rdev->desc->id == TPS68470_CORE) { 64 ret = clk_prepare_enable(data->clk); 65 if (ret) { 66 dev_err(&rdev->dev, "Error enabling TPS68470 clock\n"); 67 return ret; 68 } 69 } 70 71 return regulator_enable_regmap(rdev); 72 } 73 74 static int tps68470_regulator_disable(struct regulator_dev *rdev) 75 { 76 struct tps68470_regulator_data *data = rdev->reg_data; 77 78 if (rdev->desc->id == TPS68470_CORE) 79 clk_disable_unprepare(data->clk); 80 81 return regulator_disable_regmap(rdev); 82 } 83 84 /* Operations permitted on DCDCx, LDO2, LDO3 and LDO4 */ 85 static const struct regulator_ops tps68470_regulator_ops = { 86 .is_enabled = regulator_is_enabled_regmap, 87 .enable = tps68470_regulator_enable, 88 .disable = tps68470_regulator_disable, 89 .get_voltage_sel = regulator_get_voltage_sel_regmap, 90 .set_voltage_sel = regulator_set_voltage_sel_regmap, 91 .list_voltage = regulator_list_voltage_linear_range, 92 .map_voltage = regulator_map_voltage_linear_range, 93 }; 94 95 static const struct regulator_ops tps68470_always_on_reg_ops = { 96 .get_voltage_sel = regulator_get_voltage_sel_regmap, 97 .set_voltage_sel = regulator_set_voltage_sel_regmap, 98 .list_voltage = regulator_list_voltage_linear_range, 99 .map_voltage = regulator_map_voltage_linear_range, 100 }; 101 102 static const struct regulator_desc regulators[] = { 103 TPS68470_REGULATOR(CORE, TPS68470_CORE, tps68470_regulator_ops, 43, 104 TPS68470_REG_VDVAL, TPS68470_VDVAL_DVOLT_MASK, 105 TPS68470_REG_VDCTL, TPS68470_VDCTL_EN_MASK, 106 tps68470_core_ranges, ARRAY_SIZE(tps68470_core_ranges)), 107 TPS68470_REGULATOR(ANA, TPS68470_ANA, tps68470_regulator_ops, 126, 108 TPS68470_REG_VAVAL, TPS68470_VAVAL_AVOLT_MASK, 109 TPS68470_REG_VACTL, TPS68470_VACTL_EN_MASK, 110 tps68470_ldo_ranges, ARRAY_SIZE(tps68470_ldo_ranges)), 111 TPS68470_REGULATOR(VCM, TPS68470_VCM, tps68470_regulator_ops, 126, 112 TPS68470_REG_VCMVAL, TPS68470_VCMVAL_VCVOLT_MASK, 113 TPS68470_REG_VCMCTL, TPS68470_VCMCTL_EN_MASK, 114 tps68470_ldo_ranges, ARRAY_SIZE(tps68470_ldo_ranges)), 115 TPS68470_REGULATOR(VIO, TPS68470_VIO, tps68470_always_on_reg_ops, 126, 116 TPS68470_REG_VIOVAL, TPS68470_VIOVAL_IOVOLT_MASK, 117 0, 0, 118 tps68470_ldo_ranges, ARRAY_SIZE(tps68470_ldo_ranges)), 119 /* 120 * (1) This regulator must have the same voltage as VIO if S_IO LDO is used to 121 * power a sensor/VCM which I2C is daisy chained behind the PMIC. 122 * (2) If there is no I2C daisy chain it can be set freely. 123 */ 124 TPS68470_REGULATOR(VSIO, TPS68470_VSIO, tps68470_regulator_ops, 126, 125 TPS68470_REG_VSIOVAL, TPS68470_VSIOVAL_IOVOLT_MASK, 126 TPS68470_REG_S_I2C_CTL, TPS68470_S_I2C_CTL_EN_MASK, 127 tps68470_ldo_ranges, ARRAY_SIZE(tps68470_ldo_ranges)), 128 TPS68470_REGULATOR(AUX1, TPS68470_AUX1, tps68470_regulator_ops, 126, 129 TPS68470_REG_VAUX1VAL, TPS68470_VAUX1VAL_AUX1VOLT_MASK, 130 TPS68470_REG_VAUX1CTL, TPS68470_VAUX1CTL_EN_MASK, 131 tps68470_ldo_ranges, ARRAY_SIZE(tps68470_ldo_ranges)), 132 TPS68470_REGULATOR(AUX2, TPS68470_AUX2, tps68470_regulator_ops, 126, 133 TPS68470_REG_VAUX2VAL, TPS68470_VAUX2VAL_AUX2VOLT_MASK, 134 TPS68470_REG_VAUX2CTL, TPS68470_VAUX2CTL_EN_MASK, 135 tps68470_ldo_ranges, ARRAY_SIZE(tps68470_ldo_ranges)), 136 }; 137 138 static int tps68470_regulator_probe(struct platform_device *pdev) 139 { 140 struct device *dev = &pdev->dev; 141 struct tps68470_regulator_platform_data *pdata = dev_get_platdata(dev); 142 struct tps68470_regulator_data *data; 143 struct regulator_config config = { }; 144 struct regulator_dev *rdev; 145 int i; 146 147 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); 148 if (!data) 149 return -ENOMEM; 150 151 data->clk = devm_clk_get(dev, "tps68470-clk"); 152 if (IS_ERR(data->clk)) 153 return dev_err_probe(dev, PTR_ERR(data->clk), "getting tps68470-clk\n"); 154 155 config.dev = dev->parent; 156 config.regmap = dev_get_drvdata(dev->parent); 157 config.driver_data = data; 158 159 for (i = 0; i < TPS68470_NUM_REGULATORS; i++) { 160 if (pdata) 161 config.init_data = pdata->reg_init_data[i]; 162 else 163 config.init_data = NULL; 164 165 rdev = devm_regulator_register(dev, ®ulators[i], &config); 166 if (IS_ERR(rdev)) 167 return dev_err_probe(dev, PTR_ERR(rdev), 168 "registering %s regulator\n", 169 regulators[i].name); 170 } 171 172 return 0; 173 } 174 175 static struct platform_driver tps68470_regulator_driver = { 176 .driver = { 177 .name = "tps68470-regulator", 178 }, 179 .probe = tps68470_regulator_probe, 180 }; 181 182 /* 183 * The ACPI tps68470 probe-ordering depends on the clk/gpio/regulator drivers 184 * registering before the drivers for the camera-sensors which use them bind. 185 * subsys_initcall() ensures this when the drivers are builtin. 186 */ 187 static int __init tps68470_regulator_init(void) 188 { 189 return platform_driver_register(&tps68470_regulator_driver); 190 } 191 subsys_initcall(tps68470_regulator_init); 192 193 static void __exit tps68470_regulator_exit(void) 194 { 195 platform_driver_unregister(&tps68470_regulator_driver); 196 } 197 module_exit(tps68470_regulator_exit); 198 199 MODULE_ALIAS("platform:tps68470-regulator"); 200 MODULE_DESCRIPTION("TPS68470 voltage regulator driver"); 201 MODULE_LICENSE("GPL v2"); 202