/* * TI LM363X Regulator Driver * * Copyright 2015 Texas Instruments * * Author: Milo Kim * * 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 #include #include #include #include #include #include #include #include #include #include /* 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 struct lm363x_regulator { struct regmap *regmap; struct regulator_dev *regulator; }; const int ldo_cont_enable_time[] = { 0, 2000, 5000, 10000, 20000, 50000, 100000, 200000, }; static int lm363x_regulator_enable_time(struct regulator_dev *rdev) { struct lm363x_regulator *lm363x_regulator = rdev_get_drvdata(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(lm363x_regulator->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, "ti,lcm-en1-gpio", 0); case LM3632_LDO_NEG: return of_get_named_gpio(np, "ti,lcm-en2-gpio", 0); default: return -EINVAL; } } static int lm363x_regulator_probe(struct platform_device *pdev) { struct ti_lmu *lmu = dev_get_drvdata(pdev->dev.parent); struct lm363x_regulator *lm363x_regulator; 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; lm363x_regulator = devm_kzalloc(dev, sizeof(*lm363x_regulator), GFP_KERNEL); if (!lm363x_regulator) return -ENOMEM; lm363x_regulator->regmap = regmap; cfg.dev = dev; cfg.driver_data = lm363x_regulator; 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; } lm363x_regulator->regulator = rdev; platform_set_drvdata(pdev, lm363x_regulator); 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");