// SPDX-License-Identifier: GPL-2.0
//
// Lochnagar regulator driver
//
// Copyright (c) 2017-2018 Cirrus Logic, Inc. and
// Cirrus Logic International Semiconductor Ltd.
//
// Author: Charles Keepax <[email protected]>
#include <linux/bitops.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>
#include <linux/mfd/lochnagar.h>
#include <linux/mfd/lochnagar1_regs.h>
#include <linux/mfd/lochnagar2_regs.h>
static const struct regulator_ops lochnagar_micvdd_ops = {
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.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 = regulator_set_voltage_sel_regmap,
};
static const struct linear_range lochnagar_micvdd_ranges[] = {
REGULATOR_LINEAR_RANGE(1000000, 0, 0xC, 50000),
REGULATOR_LINEAR_RANGE(1700000, 0xD, 0x1F, 100000),
};
static int lochnagar_micbias_enable(struct regulator_dev *rdev)
{
struct lochnagar *lochnagar = rdev_get_drvdata(rdev);
int ret;
mutex_lock(&lochnagar->analogue_config_lock);
ret = regulator_enable_regmap(rdev);
if (ret < 0)
goto err;
ret = lochnagar_update_config(lochnagar);
err:
mutex_unlock(&lochnagar->analogue_config_lock);
return ret;
}
static int lochnagar_micbias_disable(struct regulator_dev *rdev)
{
struct lochnagar *lochnagar = rdev_get_drvdata(rdev);
int ret;
mutex_lock(&lochnagar->analogue_config_lock);
ret = regulator_disable_regmap(rdev);
if (ret < 0)
goto err;
ret = lochnagar_update_config(lochnagar);
err:
mutex_unlock(&lochnagar->analogue_config_lock);
return ret;
}
static const struct regulator_ops lochnagar_micbias_ops = {
.enable = lochnagar_micbias_enable,
.disable = lochnagar_micbias_disable,
.is_enabled = regulator_is_enabled_regmap,
};
static const struct regulator_ops lochnagar_vddcore_ops = {
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.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 = regulator_set_voltage_sel_regmap,
};
static const struct linear_range lochnagar_vddcore_ranges[] = {
REGULATOR_LINEAR_RANGE(600000, 0, 0x7, 0),
REGULATOR_LINEAR_RANGE(600000, 0x8, 0x41, 12500),
};
enum lochnagar_regulators {
LOCHNAGAR_MICVDD,
LOCHNAGAR_MIC1VDD,
LOCHNAGAR_MIC2VDD,
LOCHNAGAR_VDDCORE,
};
static int lochnagar_micbias_of_parse(struct device_node *np,
const struct regulator_desc *desc,
struct regulator_config *config)
{
struct lochnagar *lochnagar = config->driver_data;
int shift = (desc->id - LOCHNAGAR_MIC1VDD) *
LOCHNAGAR2_P2_MICBIAS_SRC_SHIFT;
int mask = LOCHNAGAR2_P1_MICBIAS_SRC_MASK << shift;
unsigned int val;
int ret;
ret = of_property_read_u32(np, "cirrus,micbias-input", &val);
if (ret >= 0) {
mutex_lock(&lochnagar->analogue_config_lock);
ret = regmap_update_bits(lochnagar->regmap,
LOCHNAGAR2_ANALOGUE_PATH_CTRL2,
mask, val << shift);
mutex_unlock(&lochnagar->analogue_config_lock);
if (ret < 0) {
dev_err(lochnagar->dev,
"Failed to update micbias source: %d\n", ret);
return ret;
}
}
return 0;
}
static const struct regulator_desc lochnagar_regulators[] = {
[LOCHNAGAR_MICVDD] = {
.name = "MICVDD",
.supply_name = "SYSVDD",
.type = REGULATOR_VOLTAGE,
.n_voltages = 32,
.ops = &lochnagar_micvdd_ops,
.id = LOCHNAGAR_MICVDD,
.of_match = of_match_ptr("MICVDD"),
.enable_reg = LOCHNAGAR2_MICVDD_CTRL1,
.enable_mask = LOCHNAGAR2_MICVDD_REG_ENA_MASK,
.vsel_reg = LOCHNAGAR2_MICVDD_CTRL2,
.vsel_mask = LOCHNAGAR2_MICVDD_VSEL_MASK,
.linear_ranges = lochnagar_micvdd_ranges,
.n_linear_ranges = ARRAY_SIZE(lochnagar_micvdd_ranges),
.enable_time = 3000,
.ramp_delay = 1000,
.owner = THIS_MODULE,
},
[LOCHNAGAR_MIC1VDD] = {
.name = "MIC1VDD",
.supply_name = "MICBIAS1",
.type = REGULATOR_VOLTAGE,
.ops = &lochnagar_micbias_ops,
.id = LOCHNAGAR_MIC1VDD,
.of_match = of_match_ptr("MIC1VDD"),
.of_parse_cb = lochnagar_micbias_of_parse,
.enable_reg = LOCHNAGAR2_ANALOGUE_PATH_CTRL2,
.enable_mask = LOCHNAGAR2_P1_INPUT_BIAS_ENA_MASK,
.owner = THIS_MODULE,
},
[LOCHNAGAR_MIC2VDD] = {
.name = "MIC2VDD",
.supply_name = "MICBIAS2",
.type = REGULATOR_VOLTAGE,
.ops = &lochnagar_micbias_ops,
.id = LOCHNAGAR_MIC2VDD,
.of_match = of_match_ptr("MIC2VDD"),
.of_parse_cb = lochnagar_micbias_of_parse,
.enable_reg = LOCHNAGAR2_ANALOGUE_PATH_CTRL2,
.enable_mask = LOCHNAGAR2_P2_INPUT_BIAS_ENA_MASK,
.owner = THIS_MODULE,
},
[LOCHNAGAR_VDDCORE] = {
.name = "VDDCORE",
.supply_name = "SYSVDD",
.type = REGULATOR_VOLTAGE,
.n_voltages = 66,
.ops = &lochnagar_vddcore_ops,
.id = LOCHNAGAR_VDDCORE,
.of_match = of_match_ptr("VDDCORE"),
.enable_reg = LOCHNAGAR2_VDDCORE_CDC_CTRL1,
.enable_mask = LOCHNAGAR2_VDDCORE_CDC_REG_ENA_MASK,
.vsel_reg = LOCHNAGAR2_VDDCORE_CDC_CTRL2,
.vsel_mask = LOCHNAGAR2_VDDCORE_CDC_VSEL_MASK,
.linear_ranges = lochnagar_vddcore_ranges,
.n_linear_ranges = ARRAY_SIZE(lochnagar_vddcore_ranges),
.enable_time = 3000,
.ramp_delay = 1000,
.off_on_delay = 15000,
.owner = THIS_MODULE,
},
};
static const struct of_device_id lochnagar_of_match[] = {
{
.compatible = "cirrus,lochnagar2-micvdd",
.data = &lochnagar_regulators[LOCHNAGAR_MICVDD],
},
{
.compatible = "cirrus,lochnagar2-mic1vdd",
.data = &lochnagar_regulators[LOCHNAGAR_MIC1VDD],
},
{
.compatible = "cirrus,lochnagar2-mic2vdd",
.data = &lochnagar_regulators[LOCHNAGAR_MIC2VDD],
},
{
.compatible = "cirrus,lochnagar2-vddcore",
.data = &lochnagar_regulators[LOCHNAGAR_VDDCORE],
},
{}
};
MODULE_DEVICE_TABLE(of, lochnagar_of_match);
static int lochnagar_regulator_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct lochnagar *lochnagar = dev_get_drvdata(dev->parent);
struct regulator_config config = { };
const struct regulator_desc *desc;
struct regulator_dev *rdev;
int ret;
config.dev = dev;
config.regmap = lochnagar->regmap;
config.driver_data = lochnagar;
desc = device_get_match_data(dev);
if (!desc)
return -EINVAL;
rdev = devm_regulator_register(dev, desc, &config);
if (IS_ERR(rdev)) {
ret = PTR_ERR(rdev);
dev_err(dev, "Failed to register %s regulator: %d\n",
desc->name, ret);
return ret;
}
return 0;
}
static struct platform_driver lochnagar_regulator_driver = {
.driver = {
.name = "lochnagar-regulator",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
.of_match_table = of_match_ptr(lochnagar_of_match),
},
.probe = lochnagar_regulator_probe,
};
module_platform_driver(lochnagar_regulator_driver);
MODULE_AUTHOR("Charles Keepax <[email protected]>");
MODULE_DESCRIPTION("Regulator driver for Cirrus Logic Lochnagar Board");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:lochnagar-regulator");
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