linux/drivers/regulator/stw481x-vmmc.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Regulator driver for STw4810/STw4811 VMMC regulator.
   4 *
   5 * Copyright (C) 2013 ST-Ericsson SA
   6 * Written on behalf of Linaro for ST-Ericsson
   7 *
   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                .of_match_table = stw481x_vmmc_match,
  99        },
 100        .probe = stw481x_vmmc_regulator_probe,
 101};
 102
 103module_platform_driver(stw481x_vmmc_regulator_driver);
 104