Quelle  vqmmc-ipq4019-regulator.c   Sprache: C

// 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 regmap *rmap;
 void __iomem *base;

 init_data = of_get_regulator_init_data(dev, dev->of_node,
            &vmmc_regulator);
 if (!init_data)
  return -EINVAL;

 base = devm_platform_ioremap_resource(pdev, 0);
 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\n",
   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", },
 {},
};
MODULE_DEVICE_TABLE(of, regulator_ipq4019_of_match);

static struct platform_driver ipq4019_regulator_driver = {
 .probe = ipq4019_regulator_probe,
 .driver = {
  .name = "vqmmc-ipq4019-regulator",
  .probe_type = PROBE_PREFER_ASYNCHRONOUS,
  .of_match_table = of_match_ptr(regulator_ipq4019_of_match),
 },
};
module_platform_driver(ipq4019_regulator_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mantas Pucka ");
MODULE_DESCRIPTION("IPQ4019 VQMMC voltage regulator");