LXR linux/drivers/regulator/vqmmc-ipq4019-regulator.c

   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 regulator
   7
   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 resource *res;
  52        struct regmap *rmap;
  53        void __iomem *base;
  54
  55        init_data = of_get_regulator_init_data(dev, dev->of_node,
  56                                               &vmmc_regulator);
  57        if (!init_data)
  58                return -EINVAL;
  59
  60        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  61        base = devm_ioremap_resource(dev, res);
  62        if (IS_ERR(base))
  63                return PTR_ERR(base);
  64
  65        rmap = devm_regmap_init_mmio(dev, base, &ipq4019_vmmcq_regmap_config);
  66        if (IS_ERR(rmap))
  67                return PTR_ERR(rmap);
  68
  69        cfg.dev = dev;
  70        cfg.init_data = init_data;
  71        cfg.of_node = dev->of_node;
  72        cfg.regmap = rmap;
  73
  74        rdev = devm_regulator_register(dev, &vmmc_regulator, &cfg);
  75        if (IS_ERR(rdev)) {
  76                dev_err(dev, "Failed to register regulator: %ld\n",
  77                        PTR_ERR(rdev));
  78                return PTR_ERR(rdev);
  79        }
  80        platform_set_drvdata(pdev, rdev);
  81
  82        return 0;
  83}
  84
  85static const struct of_device_id regulator_ipq4019_of_match[] = {
  86        { .compatible = "qcom,vqmmc-ipq4019-regulator", },
  87        {},
  88};
  89
  90static struct platform_driver ipq4019_regulator_driver = {
  91        .probe = ipq4019_regulator_probe,
  92        .driver = {
  93                .name = "vqmmc-ipq4019-regulator",
  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