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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Regulator driver for STw4810/STw4811 VMMC regulator.4 *5 * Copyright (C) 2013 ST-Ericsson SA6 * Written on behalf of Linaro for ST-Ericsson7 *8 * Author: Linus Walleij <linus.walleij@linaro.org>9 */10 11#include <linux/err.h>12#include <linux/init.h>13#include <linux/mfd/stw481x.h>14#include <linux/module.h>15#include <linux/platform_device.h>16#include <linux/regulator/driver.h>17#include <linux/regulator/of_regulator.h>18 19static const unsigned int stw481x_vmmc_voltages[] = {20 1800000,21 1800000,22 2850000,23 3000000,24 1850000,25 2600000,26 2700000,27 3300000,28};29 30static const struct regulator_ops stw481x_vmmc_ops = {31 .list_voltage = regulator_list_voltage_table,32 .enable = regulator_enable_regmap,33 .disable = regulator_disable_regmap,34 .is_enabled = regulator_is_enabled_regmap,35 .get_voltage_sel = regulator_get_voltage_sel_regmap,36 .set_voltage_sel = regulator_set_voltage_sel_regmap,37};38 39static const struct regulator_desc vmmc_regulator = {40 .name = "VMMC",41 .id = 0,42 .ops = &stw481x_vmmc_ops,43 .type = REGULATOR_VOLTAGE,44 .owner = THIS_MODULE,45 .n_voltages = ARRAY_SIZE(stw481x_vmmc_voltages),46 .volt_table = stw481x_vmmc_voltages,47 .enable_time = 200, /* FIXME: look this up */48 .enable_reg = STW_CONF1,49 .enable_mask = STW_CONF1_PDN_VMMC | STW_CONF1_MMC_LS_STATUS,50 .enable_val = STW_CONF1_PDN_VMMC,51 .vsel_reg = STW_CONF1,52 .vsel_mask = STW_CONF1_VMMC_MASK,53};54 55static int stw481x_vmmc_regulator_probe(struct platform_device *pdev)56{57 struct stw481x *stw481x = dev_get_platdata(&pdev->dev);58 struct regulator_config config = { };59 struct regulator_dev *rdev;60 int ret;61 62 /* First disable the external VMMC if it's active */63 ret = regmap_update_bits(stw481x->map, STW_CONF2,64 STW_CONF2_VMMC_EXT, 0);65 if (ret) {66 dev_err(&pdev->dev, "could not disable external VMMC\n");67 return ret;68 }69 70 /* Register VMMC regulator */71 config.dev = &pdev->dev;72 config.driver_data = stw481x;73 config.regmap = stw481x->map;74 config.of_node = pdev->dev.of_node;75 config.init_data = of_get_regulator_init_data(&pdev->dev,76 pdev->dev.of_node,77 &vmmc_regulator);78 79 rdev = devm_regulator_register(&pdev->dev, &vmmc_regulator, &config);80 if (IS_ERR(rdev)) {81 dev_err(&pdev->dev,82 "error initializing STw481x VMMC regulator\n");83 return PTR_ERR(rdev);84 }85 86 dev_info(&pdev->dev, "initialized STw481x VMMC regulator\n");87 return 0;88}89 90static const struct of_device_id stw481x_vmmc_match[] = {91 { .compatible = "st,stw481x-vmmc", },92 {},93};94 95static struct platform_driver stw481x_vmmc_regulator_driver = {96 .driver = {97 .name = "stw481x-vmmc-regulator",98 .probe_type = PROBE_PREFER_ASYNCHRONOUS,99 .of_match_table = stw481x_vmmc_match,100 },101 .probe = stw481x_vmmc_regulator_probe,102};103 104module_platform_driver(stw481x_vmmc_regulator_driver);105