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linux-stable/drivers/regulator/da9121-regulator.c
Adam Ward c860476b9e
regulator: da9121: Add device variant regmaps 
Add ability to probe device and validate configuration, then apply a regmap
configuration for a single or dual buck device accordingly.

Signed-off-by: Adam Ward <Adam.Ward.opensource@diasemi.com>
Link: https://lore.kernel.org/r/068c6b8d5e1b4e221e899e4c914c429429a2ec7d.1606755367.git.Adam.Ward.opensource@diasemi.com
Signed-off-by: Mark Brown <broonie@kernel.org>
2020-12-01 12:17:58 +00:00

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// SPDX-License-Identifier: GPL-2.0-only
//
// DA9121 Single-channel dual-phase 10A buck converter
//
// Copyright (C) 2020 Axis Communications AB
//
// DA9130 Single-channel dual-phase 10A buck converter (Automotive)
// DA9217 Single-channel dual-phase 6A buck converter
// DA9122 Dual-channel single-phase 5A buck converter
// DA9131 Dual-channel single-phase 5A buck converter (Automotive)
// DA9220 Dual-channel single-phase 3A buck converter
// DA9132 Dual-channel single-phase 3A buck converter (Automotive)
//
// Copyright (C) 2020 Dialog Semiconductor
#include <linux/of_device.h>
#include <linux/regulator/of_regulator.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/driver.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/regulator/da9121.h>
#include "da9121-regulator.h"
/* Chip data */
struct da9121 {
struct device *dev;
struct regmap *regmap;
int variant_id;
};
static const struct regulator_ops da9121_buck_ops = {
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.list_voltage = regulator_list_voltage_linear,
};
#define DA9121_MIN_MV 300
#define DA9121_MAX_MV 1900
#define DA9121_STEP_MV 10
#define DA9121_MIN_SEL (DA9121_MIN_MV / DA9121_STEP_MV)
#define DA9121_N_VOLTAGES (((DA9121_MAX_MV - DA9121_MIN_MV) / DA9121_STEP_MV) \
+ 1 + DA9121_MIN_SEL)
static const struct regulator_desc da9121_reg = {
.name = "da9121",
.of_match = "buck1",
.owner = THIS_MODULE,
.ops = &da9121_buck_ops,
.type = REGULATOR_VOLTAGE,
.n_voltages = DA9121_N_VOLTAGES,
.min_uV = DA9121_MIN_MV * 1000,
.uV_step = DA9121_STEP_MV * 1000,
.linear_min_sel = DA9121_MIN_SEL,
.vsel_reg = DA9121_REG_BUCK_BUCK1_5,
.vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
.enable_reg = DA9121_REG_BUCK_BUCK1_0,
.enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
/* Default value of BUCK_BUCK1_0.CH1_SRC_DVC_UP */
.ramp_delay = 20000,
/* tBUCK_EN */
.enable_time = 20,
};
/* DA9121 chip register model */
static const struct regmap_range da9121_1ch_readable_ranges[] = {
regmap_reg_range(DA9121_REG_SYS_STATUS_0, DA9121_REG_SYS_MASK_3),
regmap_reg_range(DA9121_REG_SYS_CONFIG_2, DA9121_REG_SYS_CONFIG_3),
regmap_reg_range(DA9121_REG_SYS_GPIO0_0, DA9121_REG_SYS_GPIO2_1),
regmap_reg_range(DA9121_REG_BUCK_BUCK1_0, DA9121_REG_BUCK_BUCK1_6),
regmap_reg_range(DA9121_REG_OTP_DEVICE_ID, DA9121_REG_OTP_CONFIG_ID),
};
static const struct regmap_access_table da9121_1ch_readable_table = {
.yes_ranges = da9121_1ch_readable_ranges,
.n_yes_ranges = ARRAY_SIZE(da9121_1ch_readable_ranges),
};
static const struct regmap_range da9121_2ch_readable_ranges[] = {
regmap_reg_range(DA9121_REG_SYS_STATUS_0, DA9121_REG_SYS_MASK_3),
regmap_reg_range(DA9121_REG_SYS_CONFIG_2, DA9121_REG_SYS_CONFIG_3),
regmap_reg_range(DA9121_REG_SYS_GPIO0_0, DA9121_REG_SYS_GPIO2_1),
regmap_reg_range(DA9121_REG_BUCK_BUCK1_0, DA9121_REG_BUCK_BUCK1_7),
regmap_reg_range(DA9xxx_REG_BUCK_BUCK2_0, DA9xxx_REG_BUCK_BUCK2_7),
regmap_reg_range(DA9121_REG_OTP_DEVICE_ID, DA9121_REG_OTP_CONFIG_ID),
};
static const struct regmap_access_table da9121_2ch_readable_table = {
.yes_ranges = da9121_2ch_readable_ranges,
.n_yes_ranges = ARRAY_SIZE(da9121_2ch_readable_ranges),
};
static const struct regmap_range da9121_1ch_writeable_ranges[] = {
regmap_reg_range(DA9121_REG_SYS_EVENT_0, DA9121_REG_SYS_MASK_3),
regmap_reg_range(DA9121_REG_SYS_CONFIG_2, DA9121_REG_SYS_CONFIG_3),
regmap_reg_range(DA9121_REG_SYS_GPIO0_0, DA9121_REG_SYS_GPIO2_1),
regmap_reg_range(DA9121_REG_BUCK_BUCK1_0, DA9121_REG_BUCK_BUCK1_2),
regmap_reg_range(DA9121_REG_BUCK_BUCK1_4, DA9121_REG_BUCK_BUCK1_6),
};
static const struct regmap_access_table da9121_1ch_writeable_table = {
.yes_ranges = da9121_1ch_writeable_ranges,
.n_yes_ranges = ARRAY_SIZE(da9121_1ch_writeable_ranges),
};
static const struct regmap_range da9121_2ch_writeable_ranges[] = {
regmap_reg_range(DA9121_REG_SYS_EVENT_0, DA9121_REG_SYS_MASK_3),
regmap_reg_range(DA9121_REG_SYS_CONFIG_2, DA9121_REG_SYS_CONFIG_3),
regmap_reg_range(DA9121_REG_SYS_GPIO0_0, DA9121_REG_SYS_GPIO2_1),
regmap_reg_range(DA9121_REG_BUCK_BUCK1_0, DA9121_REG_BUCK_BUCK1_2),
regmap_reg_range(DA9121_REG_BUCK_BUCK1_4, DA9121_REG_BUCK_BUCK1_7),
regmap_reg_range(DA9xxx_REG_BUCK_BUCK2_0, DA9xxx_REG_BUCK_BUCK2_2),
regmap_reg_range(DA9xxx_REG_BUCK_BUCK2_4, DA9xxx_REG_BUCK_BUCK2_7),
};
static const struct regmap_access_table da9121_2ch_writeable_table = {
.yes_ranges = da9121_2ch_writeable_ranges,
.n_yes_ranges = ARRAY_SIZE(da9121_2ch_writeable_ranges),
};
static const struct regmap_range da9121_volatile_ranges[] = {
regmap_reg_range(DA9121_REG_SYS_STATUS_0, DA9121_REG_SYS_EVENT_2),
regmap_reg_range(DA9121_REG_SYS_GPIO0_0, DA9121_REG_SYS_GPIO2_1),
regmap_reg_range(DA9121_REG_BUCK_BUCK1_0, DA9121_REG_BUCK_BUCK1_6),
};
static const struct regmap_access_table da9121_volatile_table = {
.yes_ranges = da9121_volatile_ranges,
.n_yes_ranges = ARRAY_SIZE(da9121_volatile_ranges),
};
/* DA9121 regmap config for 1 channel variants */
static struct regmap_config da9121_1ch_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = DA9121_REG_OTP_CONFIG_ID,
.rd_table = &da9121_1ch_readable_table,
.wr_table = &da9121_1ch_writeable_table,
.volatile_table = &da9121_volatile_table,
.cache_type = REGCACHE_RBTREE,
};
/* DA9121 regmap config for 2 channel variants */
static struct regmap_config da9121_2ch_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = DA9121_REG_OTP_CONFIG_ID,
.rd_table = &da9121_2ch_readable_table,
.wr_table = &da9121_2ch_writeable_table,
.volatile_table = &da9121_volatile_table,
.cache_type = REGCACHE_RBTREE,
};
static int da9121_check_device_type(struct i2c_client *i2c, struct da9121 *chip)
{
u32 device_id;
u8 chip_id = chip->variant_id;
u32 variant_id;
u8 variant_mrc, variant_vrc;
char *type;
const char *name;
bool config_match = false;
int ret = 0;
ret = regmap_read(chip->regmap, DA9121_REG_OTP_DEVICE_ID, &device_id);
if (ret < 0) {
dev_err(chip->dev, "Cannot read device ID: %d\n", ret);
goto error;
}
ret = regmap_read(chip->regmap, DA9121_REG_OTP_VARIANT_ID, &variant_id);
if (ret < 0) {
dev_err(chip->dev, "Cannot read variant ID: %d\n", ret);
goto error;
}
if (device_id != DA9121_DEVICE_ID) {
dev_err(chip->dev, "Invalid device ID: 0x%02x\n", device_id);
ret = -ENODEV;
goto error;
}
variant_vrc = variant_id & DA9121_MASK_OTP_VARIANT_ID_VRC;
switch (variant_vrc) {
case DA9121_VARIANT_VRC:
type = "DA9121/DA9130";
config_match = (chip_id == DA9121_TYPE_DA9121_DA9130);
break;
case DA9220_VARIANT_VRC:
type = "DA9220/DA9132";
config_match = (chip_id == DA9121_TYPE_DA9220_DA9132);
break;
case DA9122_VARIANT_VRC:
type = "DA9122/DA9131";
config_match = (chip_id == DA9121_TYPE_DA9122_DA9131);
break;
case DA9217_VARIANT_VRC:
type = "DA9217";
config_match = (chip_id == DA9121_TYPE_DA9217);
break;
default:
type = "Unknown";
break;
}
dev_info(chip->dev,
"Device detected (device-ID: 0x%02X, var-ID: 0x%02X, %s)\n",
device_id, variant_id, type);
if (!config_match) {
dev_err(chip->dev, "Device tree configuration '%s' does not match detected device.\n", name);
ret = -EINVAL;
goto error;
}
variant_mrc = (variant_id & DA9121_MASK_OTP_VARIANT_ID_MRC)
>> DA9121_SHIFT_OTP_VARIANT_ID_MRC;
if ((device_id == DA9121_DEVICE_ID) &&
(variant_mrc < DA9121_VARIANT_MRC_BASE)) {
dev_err(chip->dev,
"Cannot support variant MRC: 0x%02X\n", variant_mrc);
ret = -EINVAL;
}
error:
return ret;
}
static int da9121_assign_chip_model(struct i2c_client *i2c,
struct da9121 *chip)
{
struct regmap_config *regmap;
int ret = 0;
chip->dev = &i2c->dev;
switch (chip->variant_id) {
case DA9121_TYPE_DA9121_DA9130:
fallthrough;
case DA9121_TYPE_DA9217:
regmap = &da9121_1ch_regmap_config;
break;
case DA9121_TYPE_DA9122_DA9131:
fallthrough;
case DA9121_TYPE_DA9220_DA9132:
regmap = &da9121_2ch_regmap_config;
break;
}
chip->regmap = devm_regmap_init_i2c(i2c, regmap);
if (IS_ERR(chip->regmap)) {
ret = PTR_ERR(chip->regmap);
dev_err(chip->dev, "Failed to configure a register map: %d\n",
ret);
}
ret = da9121_check_device_type(i2c, chip);
return ret;
}
static const struct of_device_id da9121_dt_ids[] = {
{ .compatible = "dlg,da9121", .data = (void *) DA9121_TYPE_DA9121_DA9130 },
{ .compatible = "dlg,da9130", .data = (void *) DA9121_TYPE_DA9121_DA9130 },
{ .compatible = "dlg,da9217", .data = (void *) DA9121_TYPE_DA9217 },
{ .compatible = "dlg,da9122", .data = (void *) DA9121_TYPE_DA9122_DA9131 },
{ .compatible = "dlg,da9131", .data = (void *) DA9121_TYPE_DA9122_DA9131 },
{ .compatible = "dlg,da9220", .data = (void *) DA9121_TYPE_DA9220_DA9132 },
{ .compatible = "dlg,da9132", .data = (void *) DA9121_TYPE_DA9220_DA9132 },
{ }
};
MODULE_DEVICE_TABLE(of, da9121_dt_ids);
static inline int da9121_of_get_id(struct device *dev)
{
const struct of_device_id *id = of_match_device(da9121_dt_ids, dev);
if (!id) {
dev_err(dev, "%s: Failed\n", __func__);
return -EINVAL;
}
return (uintptr_t)id->data;
}
static int da9121_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct da9121 *chip;
int ret = 0;
struct device *dev = &i2c->dev;
struct regulator_config config = {};
struct regulator_dev *rdev;
chip = devm_kzalloc(&i2c->dev, sizeof(struct da9121), GFP_KERNEL);
if (!chip) {
ret = -ENOMEM;
goto error;
}
chip->variant_id = da9121_of_get_id(&i2c->dev);
ret = da9121_assign_chip_model(i2c, chip);
if (ret < 0)
goto error;
config.dev = &i2c->dev;
config.of_node = dev->of_node;
config.regmap = chip->regmap;
rdev = devm_regulator_register(&i2c->dev, &da9121_reg, &config);
if (IS_ERR(rdev)) {
dev_err(&i2c->dev, "Failed to register da9121 regulator\n");
return PTR_ERR(rdev);
}
error:
return ret;
}
static const struct i2c_device_id da9121_i2c_id[] = {
{"da9121", DA9121_TYPE_DA9121_DA9130},
{"da9130", DA9121_TYPE_DA9121_DA9130},
{"da9217", DA9121_TYPE_DA9217},
{"da9122", DA9121_TYPE_DA9122_DA9131},
{"da9131", DA9121_TYPE_DA9122_DA9131},
{"da9220", DA9121_TYPE_DA9220_DA9132},
{"da9132", DA9121_TYPE_DA9220_DA9132},
{},
};
MODULE_DEVICE_TABLE(i2c, da9121_i2c_id);
static struct i2c_driver da9121_regulator_driver = {
.driver = {
.name = "da9121",
.of_match_table = of_match_ptr(da9121_dt_ids),
},
.probe = da9121_i2c_probe,
.id_table = da9121_i2c_id,
};
module_i2c_driver(da9121_regulator_driver);
MODULE_LICENSE("GPL v2");
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