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
  17 static const unsigned int ipq4019_vmmc_voltages[] = {
  18         1500000, 1800000, 2500000, 3000000,
  19 };
  20
  21 static 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
  28 static 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
  39 static const struct regmap_config ipq4019_vmmcq_regmap_config = {
  40         .reg_bits       = 32,
  41         .reg_stride     = 4,
  42         .val_bits       = 32,
  43 };
  44
  45 static 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
  85 static const struct of_device_id regulator_ipq4019_of_match[] = {
  86         { .compatible = "qcom,vqmmc-ipq4019-regulator", },
  87         {},
  88 };
  89
  90 static 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 };
  97 module_platform_driver(ipq4019_regulator_driver);
  98
  99 MODULE_LICENSE("GPL");
 100 MODULE_AUTHOR("Mantas Pucka <mantas@8devices.com>");
 101 MODULE_DESCRIPTION("IPQ4019 VQMMC voltage regulator");