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kernel-ark/drivers/regulator/lm363x-regulator.c
Linus Walleij 63239e4bf7
regulator: Fetch enable gpiods nonexclusive 
Since the core regulator code is treating GPIO descriptors as
nonexclusive, i.e. it assumes that the enable GPIO line may be
shared with several regulators, let's add the flag introduced
for fixing this problem on fixed regulators to all drivers
fetching GPIO descriptors to avoid possible regressions.

Reported-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
2018-10-15 10:48:59 +01:00

294 lines
8.3 KiB
C
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/*
* 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/gpio/consumer.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 struct gpio_desc *lm363x_regulator_of_get_enable_gpio(struct device *dev, 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 devm_gpiod_get_index_optional(dev, "enable", 0,
GPIOD_OUT_LOW | GPIOD_FLAGS_BIT_NONEXCLUSIVE);
case LM3632_LDO_NEG:
return devm_gpiod_get_index_optional(dev, "enable", 1,
GPIOD_OUT_LOW | GPIOD_FLAGS_BIT_NONEXCLUSIVE);
default:
return NULL;
}
}
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;
struct gpio_desc *gpiod;
int ret;
cfg.dev = dev;
cfg.regmap = regmap;
/*
* LM3632 LDOs can be controlled by external pin.
* Register update is required if the pin is used.
*/
gpiod = lm363x_regulator_of_get_enable_gpio(dev, id);
if (gpiod) {
cfg.ena_gpiod = gpiod;
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");
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