1 // SPDX-License-Identifier: GPL-2.0-only 2 // Copyright Axis Communications AB 3 4 #include <linux/err.h> 5 #include <linux/i2c.h> 6 #include <linux/module.h> 7 #include <linux/of_device.h> 8 #include <linux/regmap.h> 9 #include <linux/regulator/of_regulator.h> 10 #include <linux/regulator/machine.h> 11 #include <linux/regulator/driver.h> 12 13 #include <dt-bindings/regulator/ti,tps62864.h> 14 15 #define TPS6286X_VOUT1 0x01 16 #define TPS6286X_VOUT1_VO1_SET GENMASK(7, 0) 17 18 #define TPS6286X_CONTROL 0x03 19 #define TPS6286X_CONTROL_FPWM BIT(4) 20 #define TPS6286X_CONTROL_SWEN BIT(5) 21 22 #define TPS6286X_MIN_MV 400 23 #define TPS6286X_MAX_MV 1675 24 #define TPS6286X_STEP_MV 5 25 26 static const struct regmap_config tps6286x_regmap_config = { 27 .reg_bits = 8, 28 .val_bits = 8, 29 }; 30 31 static int tps6286x_set_mode(struct regulator_dev *rdev, unsigned int mode) 32 { 33 unsigned int val; 34 35 switch (mode) { 36 case REGULATOR_MODE_NORMAL: 37 val = 0; 38 break; 39 case REGULATOR_MODE_FAST: 40 val = TPS6286X_CONTROL_FPWM; 41 break; 42 default: 43 return -EINVAL; 44 } 45 46 return regmap_update_bits(rdev->regmap, TPS6286X_CONTROL, 47 TPS6286X_CONTROL_FPWM, val); 48 } 49 50 static unsigned int tps6286x_get_mode(struct regulator_dev *rdev) 51 { 52 unsigned int val; 53 int ret; 54 55 ret = regmap_read(rdev->regmap, TPS6286X_CONTROL, &val); 56 if (ret < 0) 57 return 0; 58 59 return (val & TPS6286X_CONTROL_FPWM) ? REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL; 60 } 61 62 static const struct regulator_ops tps6286x_regulator_ops = { 63 .enable = regulator_enable_regmap, 64 .disable = regulator_disable_regmap, 65 .set_mode = tps6286x_set_mode, 66 .get_mode = tps6286x_get_mode, 67 .is_enabled = regulator_is_enabled_regmap, 68 .set_voltage_sel = regulator_set_voltage_sel_regmap, 69 .get_voltage_sel = regulator_get_voltage_sel_regmap, 70 .list_voltage = regulator_list_voltage_linear, 71 }; 72 73 static unsigned int tps6286x_of_map_mode(unsigned int mode) 74 { 75 switch (mode) { 76 case TPS62864_MODE_NORMAL: 77 return REGULATOR_MODE_NORMAL; 78 case TPS62864_MODE_FPWM: 79 return REGULATOR_MODE_FAST; 80 default: 81 return REGULATOR_MODE_INVALID; 82 } 83 } 84 85 static const struct regulator_desc tps6286x_reg = { 86 .name = "tps6286x", 87 .of_match = of_match_ptr("SW"), 88 .owner = THIS_MODULE, 89 .ops = &tps6286x_regulator_ops, 90 .of_map_mode = tps6286x_of_map_mode, 91 .regulators_node = of_match_ptr("regulators"), 92 .type = REGULATOR_VOLTAGE, 93 .n_voltages = ((TPS6286X_MAX_MV - TPS6286X_MIN_MV) / TPS6286X_STEP_MV) + 1, 94 .min_uV = TPS6286X_MIN_MV * 1000, 95 .uV_step = TPS6286X_STEP_MV * 1000, 96 .vsel_reg = TPS6286X_VOUT1, 97 .vsel_mask = TPS6286X_VOUT1_VO1_SET, 98 .enable_reg = TPS6286X_CONTROL, 99 .enable_mask = TPS6286X_CONTROL_SWEN, 100 .ramp_delay = 1000, 101 /* tDelay + tRamp, rounded up */ 102 .enable_time = 3000, 103 }; 104 105 static const struct of_device_id tps6286x_dt_ids[] = { 106 { .compatible = "ti,tps62864", }, 107 { .compatible = "ti,tps62866", }, 108 { .compatible = "ti,tps62868", }, 109 { .compatible = "ti,tps62869", }, 110 { } 111 }; 112 MODULE_DEVICE_TABLE(of, tps6286x_dt_ids); 113 114 static int tps6286x_i2c_probe(struct i2c_client *i2c, 115 const struct i2c_device_id *id) 116 { 117 struct device *dev = &i2c->dev; 118 struct regulator_config config = {}; 119 struct regulator_dev *rdev; 120 struct regmap *regmap; 121 122 regmap = devm_regmap_init_i2c(i2c, &tps6286x_regmap_config); 123 if (IS_ERR(regmap)) 124 return PTR_ERR(regmap); 125 126 config.dev = &i2c->dev; 127 config.of_node = dev->of_node; 128 config.regmap = regmap; 129 130 rdev = devm_regulator_register(&i2c->dev, &tps6286x_reg, &config); 131 if (IS_ERR(rdev)) { 132 dev_err(&i2c->dev, "Failed to register tps6286x regulator\n"); 133 return PTR_ERR(rdev); 134 } 135 136 return 0; 137 } 138 139 static const struct i2c_device_id tps6286x_i2c_id[] = { 140 { "tps62864", 0 }, 141 { "tps62866", 0 }, 142 { "tps62868", 0 }, 143 { "tps62869", 0 }, 144 {}, 145 }; 146 MODULE_DEVICE_TABLE(i2c, tps6286x_i2c_id); 147 148 static struct i2c_driver tps6286x_regulator_driver = { 149 .driver = { 150 .name = "tps6286x", 151 .of_match_table = of_match_ptr(tps6286x_dt_ids), 152 }, 153 .probe = tps6286x_i2c_probe, 154 .id_table = tps6286x_i2c_id, 155 }; 156 157 module_i2c_driver(tps6286x_regulator_driver); 158 159 MODULE_LICENSE("GPL v2"); 160