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author | Milo Kim <milo.kim@ti.com> | 2015-11-26 06:57:05 (GMT) |
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committer | Mark Brown <broonie@kernel.org> | 2015-11-27 12:37:26 (GMT) |
commit | 3a8d1a73a037e1bf099dbbd477e017607bc3dc20 (patch) | |
tree | 9c88108a45977a8d3bbf1854742bd50002dc7115 /drivers/regulator/lm363x-regulator.c | |
parent | 8005c49d9aea74d382f474ce11afbbc7d7130bec (diff) | |
download | linux-3a8d1a73a037e1bf099dbbd477e017607bc3dc20.tar.xz |
regulator: add LM363X driver
LM363X regulator driver supports LM3631 and LM3632.
LM3631 has 5 regulators. LM3632 provides 3 regulators.
One boost output and LDOs are used for the display module.
Boost voltage is configurable but always on.
Supported operations for LDOs are enabled/disabled and voltage change.
Two LDOs of LM3632 can be controlled by external pins.
Those are configured through the DT properties.
Signed-off-by: Milo Kim <milo.kim@ti.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/regulator/lm363x-regulator.c')
-rw-r--r-- | drivers/regulator/lm363x-regulator.c | 309 |
1 files changed, 309 insertions, 0 deletions
diff --git a/drivers/regulator/lm363x-regulator.c b/drivers/regulator/lm363x-regulator.c new file mode 100644 index 0000000..e1b683e --- /dev/null +++ b/drivers/regulator/lm363x-regulator.c @@ -0,0 +1,309 @@ +/* + * 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 + +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"); |