249 lines
6.6 KiB
C
249 lines
6.6 KiB
C
/*
|
|
* Regulator driver for mp8865
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
* for more details.
|
|
*/
|
|
|
|
#include <linux/i2c.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/regmap.h>
|
|
#include <linux/regulator/driver.h>
|
|
#include <linux/regulator/of_regulator.h>
|
|
|
|
#define MP8865_MAX_VSEL 0x7f
|
|
#define VOL_MIN_IDX 0x00
|
|
#define VOL_MAX_IDX 0x7f
|
|
#define MP8865_ENABLE_TIME 150
|
|
|
|
/* Register definitions */
|
|
#define MP8865_VOUT_REG 0
|
|
#define MP8865_SYSCNTL_REG 1
|
|
#define MP8865_ID_REG 2
|
|
#define MP8865_STATUS_REG 3
|
|
#define MP8865_MAX_REG 4
|
|
|
|
#define MP8865_VOUT_MASK 0x7f
|
|
#define MP8865_VBOOT_MASK 0x80
|
|
|
|
#define MP8865_ENABLE 0x80
|
|
#define MP8865_GO_BIT 0x40
|
|
#define MP8865_SLEW_RATE_MASK 0x38
|
|
#define MP8865_SWITCH_FRE_MASK 0x06
|
|
#define MP8865_PFM_MODE 0X01
|
|
|
|
/* mp8865 chip information */
|
|
struct mp8865_chip {
|
|
struct device *dev;
|
|
struct regulator_desc desc;
|
|
struct regulator_dev *rdev;
|
|
struct regmap *regmap;
|
|
};
|
|
|
|
struct mp8865_platform_data {
|
|
struct regulator_init_data *mp8865_init_data;
|
|
struct device_node *of_node;
|
|
};
|
|
|
|
static const struct linear_range mp8865_voltage_ranges[] = {
|
|
REGULATOR_LINEAR_RANGE(600000, VOL_MIN_IDX, VOL_MAX_IDX, 10000),
|
|
};
|
|
|
|
static int mp8865_set_voltage(struct regulator_dev *rdev, unsigned sel)
|
|
{
|
|
int ret;
|
|
|
|
ret = regmap_update_bits(rdev->regmap, MP8865_SYSCNTL_REG,
|
|
MP8865_GO_BIT, MP8865_GO_BIT);
|
|
if (ret)
|
|
return ret;
|
|
|
|
sel <<= ffs(rdev->desc->vsel_mask) - 1;
|
|
return regmap_write(rdev->regmap, MP8865_VOUT_REG, sel);
|
|
}
|
|
|
|
static bool is_write_reg(struct device *dev, unsigned int reg)
|
|
{
|
|
return (reg < MP8865_ID_REG) ? true : false;
|
|
}
|
|
|
|
static bool is_volatile_reg(struct device *dev, unsigned int reg)
|
|
{
|
|
return (reg == MP8865_STATUS_REG) ? true : false;
|
|
}
|
|
|
|
static const struct regmap_config mp8865_regmap_config = {
|
|
.reg_bits = 8,
|
|
.val_bits = 8,
|
|
.writeable_reg = is_write_reg,
|
|
.volatile_reg = is_volatile_reg,
|
|
.max_register = MP8865_MAX_REG,
|
|
.cache_type = REGCACHE_RBTREE,
|
|
};
|
|
|
|
static struct regulator_ops mp8865_dcdc_ops = {
|
|
.list_voltage = regulator_list_voltage_linear_range,
|
|
.map_voltage = regulator_map_voltage_linear_range,
|
|
.get_voltage_sel = regulator_get_voltage_sel_regmap,
|
|
.set_voltage_sel = mp8865_set_voltage,
|
|
.set_voltage_time_sel = regulator_set_voltage_time_sel,
|
|
.enable = regulator_enable_regmap,
|
|
.disable = regulator_disable_regmap,
|
|
.is_enabled = regulator_is_enabled_regmap,
|
|
};
|
|
|
|
static const struct of_device_id mp8865_of_match[] = {
|
|
{.compatible = "mps,mp8865", .data = (void *)0},
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, mp8865_of_match);
|
|
|
|
static struct of_regulator_match mp8865_matches = {
|
|
.name = "mp8865_dcdc1",
|
|
.driver_data = (void *)0,
|
|
};
|
|
|
|
static struct mp8865_platform_data *
|
|
mp8865_parse_dt(struct i2c_client *client,
|
|
struct of_regulator_match **mp8865_reg_matches)
|
|
{
|
|
struct mp8865_platform_data *pdata;
|
|
struct device_node *np, *regulators;
|
|
int ret;
|
|
|
|
pdata = devm_kzalloc(&client->dev, sizeof(struct mp8865_platform_data),
|
|
GFP_KERNEL);
|
|
if (!pdata)
|
|
return NULL;
|
|
|
|
np = of_node_get(client->dev.of_node);
|
|
regulators = of_find_node_by_name(np, "regulators");
|
|
if (!regulators) {
|
|
dev_err(&client->dev, "regulator node not found\n");
|
|
return NULL;
|
|
}
|
|
|
|
ret = of_regulator_match(&client->dev, regulators, &mp8865_matches, 1);
|
|
if (ret < 0) {
|
|
dev_err(&client->dev, "Error parsing regulators init data\n");
|
|
return NULL;
|
|
}
|
|
*mp8865_reg_matches = &mp8865_matches;
|
|
of_node_put(regulators);
|
|
|
|
pdata->mp8865_init_data = mp8865_matches.init_data;
|
|
pdata->of_node = mp8865_matches.of_node;
|
|
|
|
return pdata;
|
|
}
|
|
|
|
static int mp8865_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct mp8865_chip *mp8865;
|
|
struct mp8865_platform_data *pdata;
|
|
struct of_regulator_match *mp8865_reg_matches = NULL;
|
|
struct regulator_dev *sy_rdev;
|
|
struct regulator_config config;
|
|
struct regulator_desc *rdesc;
|
|
int ret;
|
|
|
|
mp8865 = devm_kzalloc(&client->dev, sizeof(struct mp8865_chip),
|
|
GFP_KERNEL);
|
|
if (!mp8865)
|
|
return -ENOMEM;
|
|
pdata = dev_get_platdata(&client->dev);
|
|
if (!pdata)
|
|
pdata = mp8865_parse_dt(client, &mp8865_reg_matches);
|
|
|
|
if (!pdata || !pdata->mp8865_init_data) {
|
|
dev_err(&client->dev, "Platform data not found!\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
mp8865->dev = &client->dev;
|
|
mp8865->regmap = devm_regmap_init_i2c(client, &mp8865_regmap_config);
|
|
if (IS_ERR(mp8865->regmap)) {
|
|
dev_err(&client->dev, "Failed to allocate regmap!\n");
|
|
return PTR_ERR(mp8865->regmap);
|
|
}
|
|
|
|
i2c_set_clientdata(client, mp8865);
|
|
|
|
config.dev = mp8865->dev;
|
|
config.driver_data = mp8865;
|
|
config.init_data = pdata->mp8865_init_data;
|
|
config.of_node = pdata->of_node;
|
|
config.regmap = mp8865->regmap;
|
|
|
|
rdesc = &mp8865->desc;
|
|
rdesc->name = "mp8865_dcdc1",
|
|
rdesc->id = 0,
|
|
rdesc->ops = &mp8865_dcdc_ops,
|
|
rdesc->n_voltages = MP8865_MAX_VSEL + 1,
|
|
rdesc->linear_ranges = mp8865_voltage_ranges,
|
|
rdesc->n_linear_ranges = ARRAY_SIZE(mp8865_voltage_ranges),
|
|
rdesc->vsel_reg = MP8865_VOUT_REG;
|
|
rdesc->vsel_mask = MP8865_VOUT_MASK;
|
|
rdesc->enable_reg = MP8865_SYSCNTL_REG;
|
|
rdesc->enable_mask = MP8865_ENABLE;
|
|
rdesc->enable_time = MP8865_ENABLE_TIME;
|
|
rdesc->type = REGULATOR_VOLTAGE,
|
|
rdesc->owner = THIS_MODULE;
|
|
|
|
/* set slew_rate 16mV/uS */
|
|
ret = regmap_update_bits(mp8865->regmap, MP8865_SYSCNTL_REG,
|
|
MP8865_SLEW_RATE_MASK, 0x10);
|
|
if (ret) {
|
|
dev_err(mp8865->dev, "failed to set slew_rate\n");
|
|
return ret;
|
|
}
|
|
|
|
/* set switch_frequency 1.1MHz */
|
|
ret = regmap_update_bits(mp8865->regmap, MP8865_SYSCNTL_REG,
|
|
MP8865_SWITCH_FRE_MASK, 0x40);
|
|
if (ret) {
|
|
dev_err(mp8865->dev, "failed to set switch_frequency\n");
|
|
return ret;
|
|
}
|
|
|
|
sy_rdev = devm_regulator_register(mp8865->dev, &mp8865->desc,
|
|
&config);
|
|
if (IS_ERR(sy_rdev)) {
|
|
dev_err(mp8865->dev, "failed to register regulator\n");
|
|
return PTR_ERR(sy_rdev);
|
|
}
|
|
|
|
dev_info(mp8865->dev, "mp8865 register successful\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id mp8865_id[] = {
|
|
{ .name = "mps,mp8865", },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, mp8865_id);
|
|
|
|
static struct i2c_driver mp8865_driver = {
|
|
.driver = {
|
|
.name = "mp8865",
|
|
.of_match_table = of_match_ptr(mp8865_of_match),
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = mp8865_probe,
|
|
.id_table = mp8865_id,
|
|
};
|
|
module_i2c_driver(mp8865_driver);
|
|
|
|
MODULE_AUTHOR("Zain Wang <zain.wang@rock-chips.com>");
|
|
MODULE_DESCRIPTION("mp8865 voltage regulator driver");
|
|
MODULE_LICENSE("GPL v2");
|