diff options
Diffstat (limited to 'drivers/regulator/lp873x-regulator.c')
| -rw-r--r-- | drivers/regulator/lp873x-regulator.c | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/drivers/regulator/lp873x-regulator.c b/drivers/regulator/lp873x-regulator.c new file mode 100644 index 000000000..b4ffd113b --- /dev/null +++ b/drivers/regulator/lp873x-regulator.c @@ -0,0 +1,241 @@ +/* + * Regulator driver for LP873X PMIC + * + * Copyright (C) 2016 Texas Instruments Incorporated - http://www.ti.com/ + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed "as is" WITHOUT ANY WARRANTY of any + * kind, whether expressed or implied; without even the implied warranty + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License version 2 for more details. + */ + +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> + +#include <linux/mfd/lp873x.h> + +#define LP873X_REGULATOR(_name, _id, _of, _ops, _n, _vr, _vm, _er, _em, \ + _delay, _lr, _nlr, _cr) \ + [_id] = { \ + .desc = { \ + .name = _name, \ + .id = _id, \ + .of_match = of_match_ptr(_of), \ + .regulators_node = of_match_ptr("regulators"),\ + .ops = &_ops, \ + .n_voltages = _n, \ + .type = REGULATOR_VOLTAGE, \ + .owner = THIS_MODULE, \ + .vsel_reg = _vr, \ + .vsel_mask = _vm, \ + .enable_reg = _er, \ + .enable_mask = _em, \ + .ramp_delay = _delay, \ + .linear_ranges = _lr, \ + .n_linear_ranges = _nlr, \ + }, \ + .ctrl2_reg = _cr, \ + } + +struct lp873x_regulator { + struct regulator_desc desc; + unsigned int ctrl2_reg; +}; + +static const struct lp873x_regulator regulators[]; + +static const struct regulator_linear_range buck0_buck1_ranges[] = { + REGULATOR_LINEAR_RANGE(0, 0x0, 0x13, 0), + REGULATOR_LINEAR_RANGE(700000, 0x14, 0x17, 10000), + REGULATOR_LINEAR_RANGE(735000, 0x18, 0x9d, 5000), + REGULATOR_LINEAR_RANGE(1420000, 0x9e, 0xff, 20000), +}; + +static const struct regulator_linear_range ldo0_ldo1_ranges[] = { + REGULATOR_LINEAR_RANGE(800000, 0x0, 0x19, 100000), +}; + +static unsigned int lp873x_buck_ramp_delay[] = { + 30000, 15000, 10000, 7500, 3800, 1900, 940, 470 +}; + +/* LP873X BUCK current limit */ +static const unsigned int lp873x_buck_uA[] = { + 1500000, 2000000, 2500000, 3000000, 3500000, 4000000, +}; + +static int lp873x_buck_set_ramp_delay(struct regulator_dev *rdev, + int ramp_delay) +{ + int id = rdev_get_id(rdev); + struct lp873x *lp873 = rdev_get_drvdata(rdev); + unsigned int reg; + int ret; + + if (ramp_delay <= 470) + reg = 7; + else if (ramp_delay <= 940) + reg = 6; + else if (ramp_delay <= 1900) + reg = 5; + else if (ramp_delay <= 3800) + reg = 4; + else if (ramp_delay <= 7500) + reg = 3; + else if (ramp_delay <= 10000) + reg = 2; + else if (ramp_delay <= 15000) + reg = 1; + else + reg = 0; + + ret = regmap_update_bits(lp873->regmap, regulators[id].ctrl2_reg, + LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE, + reg << __ffs(LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE)); + if (ret) { + dev_err(lp873->dev, "SLEW RATE write failed: %d\n", ret); + return ret; + } + + rdev->constraints->ramp_delay = lp873x_buck_ramp_delay[reg]; + + return 0; +} + +static int lp873x_buck_set_current_limit(struct regulator_dev *rdev, + int min_uA, int max_uA) +{ + int id = rdev_get_id(rdev); + struct lp873x *lp873 = rdev_get_drvdata(rdev); + int i; + + for (i = ARRAY_SIZE(lp873x_buck_uA) - 1; i >= 0; i--) { + if (lp873x_buck_uA[i] >= min_uA && + lp873x_buck_uA[i] <= max_uA) + return regmap_update_bits(lp873->regmap, + regulators[id].ctrl2_reg, + LP873X_BUCK0_CTRL_2_BUCK0_ILIM, + i << __ffs(LP873X_BUCK0_CTRL_2_BUCK0_ILIM)); + } + + return -EINVAL; +} + +static int lp873x_buck_get_current_limit(struct regulator_dev *rdev) +{ + int id = rdev_get_id(rdev); + struct lp873x *lp873 = rdev_get_drvdata(rdev); + int ret; + unsigned int val; + + ret = regmap_read(lp873->regmap, regulators[id].ctrl2_reg, &val); + if (ret) + return ret; + + val = (val & LP873X_BUCK0_CTRL_2_BUCK0_ILIM) >> + __ffs(LP873X_BUCK0_CTRL_2_BUCK0_ILIM); + + return (val < ARRAY_SIZE(lp873x_buck_uA)) ? + lp873x_buck_uA[val] : -EINVAL; +} + +/* Operations permitted on BUCK0, BUCK1 */ +static struct regulator_ops lp873x_buck01_ops = { + .is_enabled = regulator_is_enabled_regmap, + .enable = regulator_enable_regmap, + .disable = regulator_disable_regmap, + .get_voltage_sel = regulator_get_voltage_sel_regmap, + .set_voltage_sel = regulator_set_voltage_sel_regmap, + .list_voltage = regulator_list_voltage_linear_range, + .map_voltage = regulator_map_voltage_linear_range, + .set_voltage_time_sel = regulator_set_voltage_time_sel, + .set_ramp_delay = lp873x_buck_set_ramp_delay, + .set_current_limit = lp873x_buck_set_current_limit, + .get_current_limit = lp873x_buck_get_current_limit, +}; + +/* Operations permitted on LDO0 and LDO1 */ +static struct regulator_ops lp873x_ldo01_ops = { + .is_enabled = regulator_is_enabled_regmap, + .enable = regulator_enable_regmap, + .disable = regulator_disable_regmap, + .get_voltage_sel = regulator_get_voltage_sel_regmap, + .set_voltage_sel = regulator_set_voltage_sel_regmap, + .list_voltage = regulator_list_voltage_linear_range, + .map_voltage = regulator_map_voltage_linear_range, +}; + +static const struct lp873x_regulator regulators[] = { + LP873X_REGULATOR("BUCK0", LP873X_BUCK_0, "buck0", lp873x_buck01_ops, + 256, LP873X_REG_BUCK0_VOUT, + LP873X_BUCK0_VOUT_BUCK0_VSET, LP873X_REG_BUCK0_CTRL_1, + LP873X_BUCK0_CTRL_1_BUCK0_EN, 10000, + buck0_buck1_ranges, 4, LP873X_REG_BUCK0_CTRL_2), + LP873X_REGULATOR("BUCK1", LP873X_BUCK_1, "buck1", lp873x_buck01_ops, + 256, LP873X_REG_BUCK1_VOUT, + LP873X_BUCK1_VOUT_BUCK1_VSET, LP873X_REG_BUCK1_CTRL_1, + LP873X_BUCK1_CTRL_1_BUCK1_EN, 10000, + buck0_buck1_ranges, 4, LP873X_REG_BUCK1_CTRL_2), + LP873X_REGULATOR("LDO0", LP873X_LDO_0, "ldo0", lp873x_ldo01_ops, 26, + LP873X_REG_LDO0_VOUT, LP873X_LDO0_VOUT_LDO0_VSET, + LP873X_REG_LDO0_CTRL, + LP873X_LDO0_CTRL_LDO0_EN, 0, ldo0_ldo1_ranges, 1, + 0xFF), + LP873X_REGULATOR("LDO1", LP873X_LDO_1, "ldo1", lp873x_ldo01_ops, 26, + LP873X_REG_LDO1_VOUT, LP873X_LDO1_VOUT_LDO1_VSET, + LP873X_REG_LDO1_CTRL, + LP873X_LDO1_CTRL_LDO1_EN, 0, ldo0_ldo1_ranges, 1, + 0xFF), +}; + +static int lp873x_regulator_probe(struct platform_device *pdev) +{ + struct lp873x *lp873 = dev_get_drvdata(pdev->dev.parent); + struct regulator_config config = { }; + struct regulator_dev *rdev; + int i; + + platform_set_drvdata(pdev, lp873); + + config.dev = &pdev->dev; + config.dev->of_node = lp873->dev->of_node; + config.driver_data = lp873; + config.regmap = lp873->regmap; + + for (i = 0; i < ARRAY_SIZE(regulators); i++) { + rdev = devm_regulator_register(&pdev->dev, ®ulators[i].desc, + &config); + if (IS_ERR(rdev)) { + dev_err(lp873->dev, "failed to register %s regulator\n", + pdev->name); + return PTR_ERR(rdev); + } + } + + return 0; +} + +static const struct platform_device_id lp873x_regulator_id_table[] = { + { "lp873x-regulator", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(platform, lp873x_regulator_id_table); + +static struct platform_driver lp873x_regulator_driver = { + .driver = { + .name = "lp873x-pmic", + }, + .probe = lp873x_regulator_probe, + .id_table = lp873x_regulator_id_table, +}; +module_platform_driver(lp873x_regulator_driver); + +MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>"); +MODULE_DESCRIPTION("LP873X voltage regulator driver"); +MODULE_ALIAS("platform:lp873x-pmic"); +MODULE_LICENSE("GPL v2"); |