drivers/regulator/stw481x-vmmc.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Regulator driver for STw4810/STw4811 VMMC regulator.
0004  *
0005  * Copyright (C) 2013 ST-Ericsson SA
0006  * Written on behalf of Linaro for ST-Ericsson
0007  *
0008  * Author: Linus Walleij <linus.walleij@linaro.org>
0009  */
0010
0011 #include <linux/err.h>
0012 #include <linux/init.h>
0013 #include <linux/mfd/stw481x.h>
0014 #include <linux/module.h>
0015 #include <linux/platform_device.h>
0016 #include <linux/regulator/driver.h>
0017 #include <linux/regulator/of_regulator.h>
0018
0019 static const unsigned int stw481x_vmmc_voltages[] = {
0020     1800000,
0021     1800000,
0022     2850000,
0023     3000000,
0024     1850000,
0025     2600000,
0026     2700000,
0027     3300000,
0028 };
0029
0030 static const struct regulator_ops stw481x_vmmc_ops = {
0031     .list_voltage = regulator_list_voltage_table,
0032     .enable      = regulator_enable_regmap,
0033     .disable     = regulator_disable_regmap,
0034     .is_enabled  = regulator_is_enabled_regmap,
0035     .get_voltage_sel = regulator_get_voltage_sel_regmap,
0036     .set_voltage_sel = regulator_set_voltage_sel_regmap,
0037 };
0038
0039 static const struct regulator_desc vmmc_regulator = {
0040     .name = "VMMC",
0041     .id   = 0,
0042     .ops  = &stw481x_vmmc_ops,
0043     .type = REGULATOR_VOLTAGE,
0044     .owner = THIS_MODULE,
0045     .n_voltages = ARRAY_SIZE(stw481x_vmmc_voltages),
0046     .volt_table = stw481x_vmmc_voltages,
0047     .enable_time = 200, /* FIXME: look this up */
0048     .enable_reg = STW_CONF1,
0049     .enable_mask = STW_CONF1_PDN_VMMC | STW_CONF1_MMC_LS_STATUS,
0050     .enable_val = STW_CONF1_PDN_VMMC,
0051     .vsel_reg = STW_CONF1,
0052     .vsel_mask = STW_CONF1_VMMC_MASK,
0053 };
0054
0055 static int stw481x_vmmc_regulator_probe(struct platform_device *pdev)
0056 {
0057     struct stw481x *stw481x = dev_get_platdata(&pdev->dev);
0058     struct regulator_config config = { };
0059     struct regulator_dev *rdev;
0060     int ret;
0061
0062     /* First disable the external VMMC if it's active */
0063     ret = regmap_update_bits(stw481x->map, STW_CONF2,
0064                  STW_CONF2_VMMC_EXT, 0);
0065     if (ret) {
0066         dev_err(&pdev->dev, "could not disable external VMMC\n");
0067         return ret;
0068     }
0069
0070     /* Register VMMC regulator */
0071     config.dev = &pdev->dev;
0072     config.driver_data = stw481x;
0073     config.regmap = stw481x->map;
0074     config.of_node = pdev->dev.of_node;
0075     config.init_data = of_get_regulator_init_data(&pdev->dev,
0076                               pdev->dev.of_node,
0077                               &vmmc_regulator);
0078
0079     rdev = devm_regulator_register(&pdev->dev, &vmmc_regulator, &config);
0080     if (IS_ERR(rdev)) {
0081         dev_err(&pdev->dev,
0082             "error initializing STw481x VMMC regulator\n");
0083         return PTR_ERR(rdev);
0084     }
0085
0086     dev_info(&pdev->dev, "initialized STw481x VMMC regulator\n");
0087     return 0;
0088 }
0089
0090 static const struct of_device_id stw481x_vmmc_match[] = {
0091     { .compatible = "st,stw481x-vmmc", },
0092     {},
0093 };
0094
0095 static struct platform_driver stw481x_vmmc_regulator_driver = {
0096     .driver = {
0097         .name  = "stw481x-vmmc-regulator",
0098         .of_match_table = stw481x_vmmc_match,
0099     },
0100     .probe = stw481x_vmmc_regulator_probe,
0101 };
0102
0103 module_platform_driver(stw481x_vmmc_regulator_driver);