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1// SPDX-License-Identifier: GPL-2.0+2//3// Copyright (c) 2019 Mantas Pucka <mantas@8devices.com>4// Copyright (c) 2019 Robert Marko <robert.marko@sartura.hr>5//6// Driver for IPQ4019 SD/MMC controller's I/O LDO voltage regulator7 8#include <linux/io.h>9#include <linux/module.h>10#include <linux/of.h>11#include <linux/platform_device.h>12#include <linux/regmap.h>13#include <linux/regulator/driver.h>14#include <linux/regulator/machine.h>15#include <linux/regulator/of_regulator.h>16 17static const unsigned int ipq4019_vmmc_voltages[] = {18 1500000, 1800000, 2500000, 3000000,19};20 21static const struct regulator_ops ipq4019_regulator_voltage_ops = {22 .list_voltage = regulator_list_voltage_table,23 .map_voltage = regulator_map_voltage_ascend,24 .get_voltage_sel = regulator_get_voltage_sel_regmap,25 .set_voltage_sel = regulator_set_voltage_sel_regmap,26};27 28static const struct regulator_desc vmmc_regulator = {29 .name = "vmmcq",30 .ops = &ipq4019_regulator_voltage_ops,31 .type = REGULATOR_VOLTAGE,32 .owner = THIS_MODULE,33 .volt_table = ipq4019_vmmc_voltages,34 .n_voltages = ARRAY_SIZE(ipq4019_vmmc_voltages),35 .vsel_reg = 0,36 .vsel_mask = 0x3,37};38 39static const struct regmap_config ipq4019_vmmcq_regmap_config = {40 .reg_bits = 32,41 .reg_stride = 4,42 .val_bits = 32,43};44 45static int ipq4019_regulator_probe(struct platform_device *pdev)46{47 struct device *dev = &pdev->dev;48 struct regulator_init_data *init_data;49 struct regulator_config cfg = {};50 struct regulator_dev *rdev;51 struct regmap *rmap;52 void __iomem *base;53 54 init_data = of_get_regulator_init_data(dev, dev->of_node,55 &vmmc_regulator);56 if (!init_data)57 return -EINVAL;58 59 base = devm_platform_ioremap_resource(pdev, 0);60 if (IS_ERR(base))61 return PTR_ERR(base);62 63 rmap = devm_regmap_init_mmio(dev, base, &ipq4019_vmmcq_regmap_config);64 if (IS_ERR(rmap))65 return PTR_ERR(rmap);66 67 cfg.dev = dev;68 cfg.init_data = init_data;69 cfg.of_node = dev->of_node;70 cfg.regmap = rmap;71 72 rdev = devm_regulator_register(dev, &vmmc_regulator, &cfg);73 if (IS_ERR(rdev)) {74 dev_err(dev, "Failed to register regulator: %ld\n",75 PTR_ERR(rdev));76 return PTR_ERR(rdev);77 }78 platform_set_drvdata(pdev, rdev);79 80 return 0;81}82 83static const struct of_device_id regulator_ipq4019_of_match[] = {84 { .compatible = "qcom,vqmmc-ipq4019-regulator", },85 {},86};87MODULE_DEVICE_TABLE(of, regulator_ipq4019_of_match);88 89static struct platform_driver ipq4019_regulator_driver = {90 .probe = ipq4019_regulator_probe,91 .driver = {92 .name = "vqmmc-ipq4019-regulator",93 .probe_type = PROBE_PREFER_ASYNCHRONOUS,94 .of_match_table = of_match_ptr(regulator_ipq4019_of_match),95 },96};97module_platform_driver(ipq4019_regulator_driver);98 99MODULE_LICENSE("GPL");100MODULE_AUTHOR("Mantas Pucka <mantas@8devices.com>");101MODULE_DESCRIPTION("IPQ4019 VQMMC voltage regulator");102