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