105 lines
2.7 KiB
C
105 lines
2.7 KiB
C
/*
|
|
* 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>
|
|
*
|
|
* License terms: GNU General Public License (GPL) version 2
|
|
*/
|
|
|
|
#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 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 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);
|