// SPDX-License-Identifier: GPL-2.0+
  //
  // Copyright (c) 2019 Mantas Pucka <mantas@8devices.com>
  // Copyright (c) 2019 Robert Marko <robert.marko@sartura.hr>
  //
  // Driver for IPQ4019 SD/MMC controller's I/O LDO voltage regulator
  
  #include <linux/io.h>
  #include <linux/module.h>
  #include <linux/of.h>
  #include <linux/platform_device.h>
  #include <linux/regmap.h>
  #include <linux/regulator/driver.h>
  #include <linux/regulator/machine.h>
  #include <linux/regulator/of_regulator.h>
  
  static const unsigned int ipq4019_vmmc_voltages[] = {
  	1500000, 1800000, 2500000, 3000000,
  };

  static const struct regulator_ops ipq4019_regulator_voltage_ops = {

  	.list_voltage = regulator_list_voltage_table,

  	.map_voltage = regulator_map_voltage_ascend,

  	.get_voltage_sel = regulator_get_voltage_sel_regmap,
  	.set_voltage_sel = regulator_set_voltage_sel_regmap,
  };

  static const struct regulator_desc vmmc_regulator = {

  	.name		= "vmmcq",
  	.ops		= &ipq4019_regulator_voltage_ops,
  	.type		= REGULATOR_VOLTAGE,
  	.owner		= THIS_MODULE,
  	.volt_table	= ipq4019_vmmc_voltages,
  	.n_voltages	= ARRAY_SIZE(ipq4019_vmmc_voltages),
  	.vsel_reg	= 0,
  	.vsel_mask	= 0x3,
  };

  static const struct regmap_config ipq4019_vmmcq_regmap_config = {

  	.reg_bits	= 32,
  	.reg_stride	= 4,
  	.val_bits	= 32,
  };
  
  static int ipq4019_regulator_probe(struct platform_device *pdev)
  {
  	struct device *dev = &pdev->dev;
  	struct regulator_init_data *init_data;
  	struct regulator_config cfg = {};
  	struct regulator_dev *rdev;
  	struct resource *res;
  	struct regmap *rmap;
  	void __iomem *base;
  
  	init_data = of_get_regulator_init_data(dev, dev->of_node,
  					       &vmmc_regulator);
  	if (!init_data)
  		return -EINVAL;
  
  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  	base = devm_ioremap_resource(dev, res);
  	if (IS_ERR(base))
  		return PTR_ERR(base);
  
  	rmap = devm_regmap_init_mmio(dev, base, &ipq4019_vmmcq_regmap_config);
  	if (IS_ERR(rmap))
  		return PTR_ERR(rmap);
  
  	cfg.dev = dev;
  	cfg.init_data = init_data;
  	cfg.of_node = dev->of_node;
  	cfg.regmap = rmap;
  
  	rdev = devm_regulator_register(dev, &vmmc_regulator, &cfg);
  	if (IS_ERR(rdev)) {
  		dev_err(dev, "Failed to register regulator: %ld
  ",
  			PTR_ERR(rdev));
  		return PTR_ERR(rdev);
  	}
  	platform_set_drvdata(pdev, rdev);
  
  	return 0;
  }

  static const struct of_device_id regulator_ipq4019_of_match[] = {
  	{ .compatible = "qcom,vqmmc-ipq4019-regulator", },
  	{},
  };
  
  static struct platform_driver ipq4019_regulator_driver = {
  	.probe = ipq4019_regulator_probe,

  	.driver = {
  		.name = "vqmmc-ipq4019-regulator",

  		.of_match_table = of_match_ptr(regulator_ipq4019_of_match),
  	},
  };
  module_platform_driver(ipq4019_regulator_driver);
  
  MODULE_LICENSE("GPL");
  MODULE_AUTHOR("Mantas Pucka <mantas@8devices.com>");
  MODULE_DESCRIPTION("IPQ4019 VQMMC voltage regulator");