101 lines
2.7 KiB
C
101 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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//
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// Copyright (c) 2019 Mantas Pucka <mantas@8devices.com>
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// Copyright (c) 2019 Robert Marko <robert.marko@sartura.hr>
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//
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// Driver for IPQ4019 SD/MMC controller's I/O LDO voltage regulator
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/regulator/driver.h>
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#include <linux/regulator/machine.h>
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#include <linux/regulator/of_regulator.h>
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static const unsigned int ipq4019_vmmc_voltages[] = {
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1500000, 1800000, 2500000, 3000000,
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};
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static const struct regulator_ops ipq4019_regulator_voltage_ops = {
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.list_voltage = regulator_list_voltage_table,
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.map_voltage = regulator_map_voltage_ascend,
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.get_voltage_sel = regulator_get_voltage_sel_regmap,
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.set_voltage_sel = regulator_set_voltage_sel_regmap,
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};
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static const struct regulator_desc vmmc_regulator = {
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.name = "vmmcq",
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.ops = &ipq4019_regulator_voltage_ops,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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.volt_table = ipq4019_vmmc_voltages,
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.n_voltages = ARRAY_SIZE(ipq4019_vmmc_voltages),
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.vsel_reg = 0,
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.vsel_mask = 0x3,
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};
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static const struct regmap_config ipq4019_vmmcq_regmap_config = {
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.reg_bits = 32,
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.reg_stride = 4,
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.val_bits = 32,
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};
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static int ipq4019_regulator_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct regulator_init_data *init_data;
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struct regulator_config cfg = {};
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struct regulator_dev *rdev;
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struct regmap *rmap;
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void __iomem *base;
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init_data = of_get_regulator_init_data(dev, dev->of_node,
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&vmmc_regulator);
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if (!init_data)
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return -EINVAL;
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base = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(base))
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return PTR_ERR(base);
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rmap = devm_regmap_init_mmio(dev, base, &ipq4019_vmmcq_regmap_config);
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if (IS_ERR(rmap))
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return PTR_ERR(rmap);
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cfg.dev = dev;
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cfg.init_data = init_data;
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cfg.of_node = dev->of_node;
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cfg.regmap = rmap;
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rdev = devm_regulator_register(dev, &vmmc_regulator, &cfg);
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if (IS_ERR(rdev)) {
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dev_err(dev, "Failed to register regulator: %ld\n",
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PTR_ERR(rdev));
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return PTR_ERR(rdev);
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}
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platform_set_drvdata(pdev, rdev);
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return 0;
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}
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static const struct of_device_id regulator_ipq4019_of_match[] = {
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{ .compatible = "qcom,vqmmc-ipq4019-regulator", },
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{},
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};
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static struct platform_driver ipq4019_regulator_driver = {
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.probe = ipq4019_regulator_probe,
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.driver = {
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.name = "vqmmc-ipq4019-regulator",
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.probe_type = PROBE_PREFER_ASYNCHRONOUS,
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.of_match_table = of_match_ptr(regulator_ipq4019_of_match),
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},
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};
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module_platform_driver(ipq4019_regulator_driver);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Mantas Pucka <mantas@8devices.com>");
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MODULE_DESCRIPTION("IPQ4019 VQMMC voltage regulator");
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