Vincent Whitchurch | e2a01b4 | 2022-02-04 16:52:41 +0100 | [diff] [blame] | 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"); |