| /* |
| * TI LM363X Regulator Driver |
| * |
| * Copyright 2015 Texas Instruments |
| * |
| * Author: Milo Kim <milo.kim@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. |
| */ |
| |
| #include <linux/err.h> |
| #include <linux/kernel.h> |
| #include <linux/mfd/ti-lmu.h> |
| #include <linux/mfd/ti-lmu-register.h> |
| #include <linux/module.h> |
| #include <linux/of.h> |
| #include <linux/of_gpio.h> |
| #include <linux/platform_device.h> |
| #include <linux/regulator/driver.h> |
| #include <linux/regulator/of_regulator.h> |
| #include <linux/slab.h> |
| |
| /* LM3631 */ |
| #define LM3631_BOOST_VSEL_MAX 0x25 |
| #define LM3631_LDO_VSEL_MAX 0x28 |
| #define LM3631_CONT_VSEL_MAX 0x03 |
| #define LM3631_VBOOST_MIN 4500000 |
| #define LM3631_VCONT_MIN 1800000 |
| #define LM3631_VLDO_MIN 4000000 |
| #define ENABLE_TIME_USEC 1000 |
| |
| /* LM3632 */ |
| #define LM3632_BOOST_VSEL_MAX 0x26 |
| #define LM3632_LDO_VSEL_MAX 0x29 |
| #define LM3632_VBOOST_MIN 4500000 |
| #define LM3632_VLDO_MIN 4000000 |
| |
| /* Common */ |
| #define LM363X_STEP_50mV 50000 |
| #define LM363X_STEP_500mV 500000 |
| |
| static const int ldo_cont_enable_time[] = { |
| 0, 2000, 5000, 10000, 20000, 50000, 100000, 200000, |
| }; |
| |
| static int lm363x_regulator_enable_time(struct regulator_dev *rdev) |
| { |
| enum lm363x_regulator_id id = rdev_get_id(rdev); |
| u8 val, addr, mask; |
| |
| switch (id) { |
| case LM3631_LDO_CONT: |
| addr = LM3631_REG_ENTIME_VCONT; |
| mask = LM3631_ENTIME_CONT_MASK; |
| break; |
| case LM3631_LDO_OREF: |
| addr = LM3631_REG_ENTIME_VOREF; |
| mask = LM3631_ENTIME_MASK; |
| break; |
| case LM3631_LDO_POS: |
| addr = LM3631_REG_ENTIME_VPOS; |
| mask = LM3631_ENTIME_MASK; |
| break; |
| case LM3631_LDO_NEG: |
| addr = LM3631_REG_ENTIME_VNEG; |
| mask = LM3631_ENTIME_MASK; |
| break; |
| default: |
| return 0; |
| } |
| |
| if (regmap_read(rdev->regmap, addr, (unsigned int *)&val)) |
| return -EINVAL; |
| |
| val = (val & mask) >> LM3631_ENTIME_SHIFT; |
| |
| if (id == LM3631_LDO_CONT) |
| return ldo_cont_enable_time[val]; |
| else |
| return ENABLE_TIME_USEC * val; |
| } |
| |
| static struct regulator_ops lm363x_boost_voltage_table_ops = { |
| .list_voltage = regulator_list_voltage_linear, |
| .set_voltage_sel = regulator_set_voltage_sel_regmap, |
| .get_voltage_sel = regulator_get_voltage_sel_regmap, |
| }; |
| |
| static struct regulator_ops lm363x_regulator_voltage_table_ops = { |
| .list_voltage = regulator_list_voltage_linear, |
| .set_voltage_sel = regulator_set_voltage_sel_regmap, |
| .get_voltage_sel = regulator_get_voltage_sel_regmap, |
| .enable = regulator_enable_regmap, |
| .disable = regulator_disable_regmap, |
| .is_enabled = regulator_is_enabled_regmap, |
| .enable_time = lm363x_regulator_enable_time, |
| }; |
| |
| static const struct regulator_desc lm363x_regulator_desc[] = { |
| /* LM3631 */ |
| { |
| .name = "vboost", |
| .of_match = "vboost", |
| .id = LM3631_BOOST, |
| .ops = &lm363x_boost_voltage_table_ops, |
| .n_voltages = LM3631_BOOST_VSEL_MAX + 1, |
| .min_uV = LM3631_VBOOST_MIN, |
| .uV_step = LM363X_STEP_50mV, |
| .type = REGULATOR_VOLTAGE, |
| .owner = THIS_MODULE, |
| .vsel_reg = LM3631_REG_VOUT_BOOST, |
| .vsel_mask = LM3631_VOUT_MASK, |
| }, |
| { |
| .name = "ldo_cont", |
| .of_match = "vcont", |
| .id = LM3631_LDO_CONT, |
| .ops = &lm363x_regulator_voltage_table_ops, |
| .n_voltages = LM3631_CONT_VSEL_MAX + 1, |
| .min_uV = LM3631_VCONT_MIN, |
| .uV_step = LM363X_STEP_500mV, |
| .type = REGULATOR_VOLTAGE, |
| .owner = THIS_MODULE, |
| .vsel_reg = LM3631_REG_VOUT_CONT, |
| .vsel_mask = LM3631_VOUT_CONT_MASK, |
| .enable_reg = LM3631_REG_LDO_CTRL2, |
| .enable_mask = LM3631_EN_CONT_MASK, |
| }, |
| { |
| .name = "ldo_oref", |
| .of_match = "voref", |
| .id = LM3631_LDO_OREF, |
| .ops = &lm363x_regulator_voltage_table_ops, |
| .n_voltages = LM3631_LDO_VSEL_MAX + 1, |
| .min_uV = LM3631_VLDO_MIN, |
| .uV_step = LM363X_STEP_50mV, |
| .type = REGULATOR_VOLTAGE, |
| .owner = THIS_MODULE, |
| .vsel_reg = LM3631_REG_VOUT_OREF, |
| .vsel_mask = LM3631_VOUT_MASK, |
| .enable_reg = LM3631_REG_LDO_CTRL1, |
| .enable_mask = LM3631_EN_OREF_MASK, |
| }, |
| { |
| .name = "ldo_vpos", |
| .of_match = "vpos", |
| .id = LM3631_LDO_POS, |
| .ops = &lm363x_regulator_voltage_table_ops, |
| .n_voltages = LM3631_LDO_VSEL_MAX + 1, |
| .min_uV = LM3631_VLDO_MIN, |
| .uV_step = LM363X_STEP_50mV, |
| .type = REGULATOR_VOLTAGE, |
| .owner = THIS_MODULE, |
| .vsel_reg = LM3631_REG_VOUT_POS, |
| .vsel_mask = LM3631_VOUT_MASK, |
| .enable_reg = LM3631_REG_LDO_CTRL1, |
| .enable_mask = LM3631_EN_VPOS_MASK, |
| }, |
| { |
| .name = "ldo_vneg", |
| .of_match = "vneg", |
| .id = LM3631_LDO_NEG, |
| .ops = &lm363x_regulator_voltage_table_ops, |
| .n_voltages = LM3631_LDO_VSEL_MAX + 1, |
| .min_uV = LM3631_VLDO_MIN, |
| .uV_step = LM363X_STEP_50mV, |
| .type = REGULATOR_VOLTAGE, |
| .owner = THIS_MODULE, |
| .vsel_reg = LM3631_REG_VOUT_NEG, |
| .vsel_mask = LM3631_VOUT_MASK, |
| .enable_reg = LM3631_REG_LDO_CTRL1, |
| .enable_mask = LM3631_EN_VNEG_MASK, |
| }, |
| /* LM3632 */ |
| { |
| .name = "vboost", |
| .of_match = "vboost", |
| .id = LM3632_BOOST, |
| .ops = &lm363x_boost_voltage_table_ops, |
| .n_voltages = LM3632_BOOST_VSEL_MAX + 1, |
| .min_uV = LM3632_VBOOST_MIN, |
| .uV_step = LM363X_STEP_50mV, |
| .type = REGULATOR_VOLTAGE, |
| .owner = THIS_MODULE, |
| .vsel_reg = LM3632_REG_VOUT_BOOST, |
| .vsel_mask = LM3632_VOUT_MASK, |
| }, |
| { |
| .name = "ldo_vpos", |
| .of_match = "vpos", |
| .id = LM3632_LDO_POS, |
| .ops = &lm363x_regulator_voltage_table_ops, |
| .n_voltages = LM3632_LDO_VSEL_MAX + 1, |
| .min_uV = LM3632_VLDO_MIN, |
| .uV_step = LM363X_STEP_50mV, |
| .type = REGULATOR_VOLTAGE, |
| .owner = THIS_MODULE, |
| .vsel_reg = LM3632_REG_VOUT_POS, |
| .vsel_mask = LM3632_VOUT_MASK, |
| .enable_reg = LM3632_REG_BIAS_CONFIG, |
| .enable_mask = LM3632_EN_VPOS_MASK, |
| }, |
| { |
| .name = "ldo_vneg", |
| .of_match = "vneg", |
| .id = LM3632_LDO_NEG, |
| .ops = &lm363x_regulator_voltage_table_ops, |
| .n_voltages = LM3632_LDO_VSEL_MAX + 1, |
| .min_uV = LM3632_VLDO_MIN, |
| .uV_step = LM363X_STEP_50mV, |
| .type = REGULATOR_VOLTAGE, |
| .owner = THIS_MODULE, |
| .vsel_reg = LM3632_REG_VOUT_NEG, |
| .vsel_mask = LM3632_VOUT_MASK, |
| .enable_reg = LM3632_REG_BIAS_CONFIG, |
| .enable_mask = LM3632_EN_VNEG_MASK, |
| }, |
| }; |
| |
| static int lm363x_regulator_of_get_enable_gpio(struct device_node *np, int id) |
| { |
| /* |
| * Check LCM_EN1/2_GPIO is configured. |
| * Those pins are used for enabling VPOS/VNEG LDOs. |
| */ |
| switch (id) { |
| case LM3632_LDO_POS: |
| return of_get_named_gpio(np, "enable-gpios", 0); |
| case LM3632_LDO_NEG: |
| return of_get_named_gpio(np, "enable-gpios", 1); |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| static int lm363x_regulator_probe(struct platform_device *pdev) |
| { |
| struct ti_lmu *lmu = dev_get_drvdata(pdev->dev.parent); |
| struct regmap *regmap = lmu->regmap; |
| struct regulator_config cfg = { }; |
| struct regulator_dev *rdev; |
| struct device *dev = &pdev->dev; |
| int id = pdev->id; |
| int ret, ena_gpio; |
| |
| cfg.dev = dev; |
| cfg.regmap = regmap; |
| |
| /* |
| * LM3632 LDOs can be controlled by external pin. |
| * Register update is required if the pin is used. |
| */ |
| ena_gpio = lm363x_regulator_of_get_enable_gpio(dev->of_node, id); |
| if (gpio_is_valid(ena_gpio)) { |
| cfg.ena_gpio = ena_gpio; |
| cfg.ena_gpio_flags = GPIOF_OUT_INIT_LOW; |
| |
| ret = regmap_update_bits(regmap, LM3632_REG_BIAS_CONFIG, |
| LM3632_EXT_EN_MASK, |
| LM3632_EXT_EN_MASK); |
| if (ret) { |
| dev_err(dev, "External pin err: %d\n", ret); |
| return ret; |
| } |
| } |
| |
| rdev = devm_regulator_register(dev, &lm363x_regulator_desc[id], &cfg); |
| if (IS_ERR(rdev)) { |
| ret = PTR_ERR(rdev); |
| dev_err(dev, "[%d] regulator register err: %d\n", id, ret); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static struct platform_driver lm363x_regulator_driver = { |
| .probe = lm363x_regulator_probe, |
| .driver = { |
| .name = "lm363x-regulator", |
| }, |
| }; |
| |
| module_platform_driver(lm363x_regulator_driver); |
| |
| MODULE_DESCRIPTION("TI LM363X Regulator Driver"); |
| MODULE_AUTHOR("Milo Kim"); |
| MODULE_LICENSE("GPL v2"); |
| MODULE_ALIAS("platform:lm363x-regulator"); |
