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// SPDX-License-Identifier: GPL-2.0-only
/*
* Regulator driver for STw4810/STw4811 VMMC regulator.
*
* Copyright (C) 2013 ST-Ericsson SA
* Written on behalf of Linaro for ST-Ericsson
*
* Author: Linus Walleij <linus.walleij@linaro.org>
*/
#include <linux/err.h>
#include <linux/init.h>
#include <linux/mfd/stw481x.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>
static const unsigned int stw481x_vmmc_voltages[] = {
1800000,
1800000,
2850000,
3000000,
1850000,
2600000,
2700000,
3300000,
};
static const struct regulator_ops stw481x_vmmc_ops = {
.list_voltage = regulator_list_voltage_table,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
};
static const struct regulator_desc vmmc_regulator = {
.name = "VMMC",
.id = 0,
.ops = &stw481x_vmmc_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.n_voltages = ARRAY_SIZE(stw481x_vmmc_voltages),
.volt_table = stw481x_vmmc_voltages,
.enable_time = 200, /* FIXME: look this up */
.enable_reg = STW_CONF1,
.enable_mask = STW_CONF1_PDN_VMMC | STW_CONF1_MMC_LS_STATUS,
.enable_val = STW_CONF1_PDN_VMMC,
.vsel_reg = STW_CONF1,
.vsel_mask = STW_CONF1_VMMC_MASK,
};
static int stw481x_vmmc_regulator_probe(struct platform_device *pdev)
{
struct stw481x *stw481x = dev_get_platdata(&pdev->dev);
struct regulator_config config = { };
struct regulator_dev *rdev;
int ret;
/* First disable the external VMMC if it's active */
ret = regmap_update_bits(stw481x->map, STW_CONF2,
STW_CONF2_VMMC_EXT, 0);
if (ret) {
dev_err(&pdev->dev, "could not disable external VMMC\n");
return ret;
}
/* Register VMMC regulator */
config.dev = &pdev->dev;
config.driver_data = stw481x;
config.regmap = stw481x->map;
config.of_node = pdev->dev.of_node;
config.init_data = of_get_regulator_init_data(&pdev->dev,
pdev->dev.of_node,
&vmmc_regulator);
rdev = devm_regulator_register(&pdev->dev, &vmmc_regulator, &config);
if (IS_ERR(rdev)) {
dev_err(&pdev->dev,
"error initializing STw481x VMMC regulator\n");
return PTR_ERR(rdev);
}
dev_info(&pdev->dev, "initialized STw481x VMMC regulator\n");
return 0;
}
static const struct of_device_id stw481x_vmmc_match[] = {
{ .compatible = "st,stw481x-vmmc", },
{},
};
static struct platform_driver stw481x_vmmc_regulator_driver = {
.driver = {
.name = "stw481x-vmmc-regulator",
.of_match_table = stw481x_vmmc_match,
},
.probe = stw481x_vmmc_regulator_probe,
};
module_platform_driver(stw481x_vmmc_regulator_driver);
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