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The ST Microelectronics STw481x PMIC used for the Nomadik has one single software-controlled regulator for VMMC. This driver registers directly to the compatible string as there is just one regulator. Signed-off-by: Linus Walleij <[email protected]> Signed-off-by: Mark Brown <[email protected]>
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/* | ||
* Regulator driver for STw4810/STw4811 VMMC regulator. | ||
* | ||
* Copyright (C) 2013 ST-Ericsson SA | ||
* Written on behalf of Linaro for ST-Ericsson | ||
* | ||
* Author: Linus Walleij <[email protected]> | ||
* | ||
* License terms: GNU General Public License (GPL) version 2 | ||
*/ | ||
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#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> | ||
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static const unsigned int stw481x_vmmc_voltages[] = { | ||
1800000, | ||
1800000, | ||
2850000, | ||
3000000, | ||
1850000, | ||
2600000, | ||
2700000, | ||
3300000, | ||
}; | ||
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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, | ||
}; | ||
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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, | ||
.vsel_reg = STW_CONF1, | ||
.vsel_mask = STW_CONF1_VMMC_MASK, | ||
}; | ||
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static int stw481x_vmmc_regulator_probe(struct platform_device *pdev) | ||
{ | ||
struct stw481x *stw481x = dev_get_platdata(&pdev->dev); | ||
struct regulator_config config = { }; | ||
int ret; | ||
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/* 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; | ||
} | ||
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/* 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); | ||
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stw481x->vmmc_regulator = regulator_register(&vmmc_regulator, &config); | ||
if (IS_ERR(stw481x->vmmc_regulator)) { | ||
dev_err(&pdev->dev, | ||
"error initializing STw481x VMMC regulator\n"); | ||
return PTR_ERR(stw481x->vmmc_regulator); | ||
} | ||
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dev_info(&pdev->dev, "initialized STw481x VMMC regulator\n"); | ||
return 0; | ||
} | ||
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static int stw481x_vmmc_regulator_remove(struct platform_device *pdev) | ||
{ | ||
struct stw481x *stw481x = dev_get_platdata(&pdev->dev); | ||
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regulator_unregister(stw481x->vmmc_regulator); | ||
return 0; | ||
} | ||
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static const struct of_device_id stw481x_vmmc_match[] = { | ||
{ .compatible = "st,stw481x-vmmc", }, | ||
{}, | ||
}; | ||
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static struct platform_driver stw481x_vmmc_regulator_driver = { | ||
.driver = { | ||
.name = "stw481x-vmmc-regulator", | ||
.owner = THIS_MODULE, | ||
}, | ||
.probe = stw481x_vmmc_regulator_probe, | ||
.remove = stw481x_vmmc_regulator_remove, | ||
}; | ||
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module_platform_driver(stw481x_vmmc_regulator_driver); |