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As per the RZ/G2L HW manual, VBUSEN can be controlled by the VBOUT bit of the VBUS Control Register. This register is mapped in the reset framework. The reset driver expose this register as regmap and instantiates this driver. The consumer will use the regulator API to control the VBOUT bit as the control need to be done in the atomic context. Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com> Link: https://patch.msgid.link/20240616105402.45211-5-biju.das.jz@bp.renesas.com Signed-off-by: Mark Brown <broonie@kernel.org>
75 lines
2.0 KiB
C
75 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// Renesas USB VBUS output regulator driver
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//
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// Copyright (C) 2024 Renesas Electronics Corporation
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//
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/kernel.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/of_regulator.h>
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static const struct regulator_ops rzg2l_usb_vbus_reg_ops = {
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.enable = regulator_enable_regmap,
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.disable = regulator_disable_regmap,
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.is_enabled = regulator_is_enabled_regmap,
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};
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static const struct regulator_desc rzg2l_usb_vbus_rdesc = {
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.name = "vbus",
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.of_match = of_match_ptr("regulator-vbus"),
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.ops = &rzg2l_usb_vbus_reg_ops,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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.enable_reg = 0,
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.enable_mask = BIT(0),
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.enable_is_inverted = true,
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.fixed_uV = 5000000,
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.n_voltages = 1,
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};
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static int rzg2l_usb_vbus_regulator_probe(struct platform_device *pdev)
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{
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struct regulator_config config = { };
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struct device *dev = &pdev->dev;
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struct regulator_dev *rdev;
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config.regmap = dev_get_regmap(dev->parent, NULL);
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if (!config.regmap)
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return dev_err_probe(dev, -ENOENT, "Failed to get regmap\n");
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config.dev = dev;
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config.of_node = of_get_child_by_name(dev->parent->of_node, "regulator-vbus");
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if (!config.of_node)
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return dev_err_probe(dev, -ENODEV, "regulator node not found\n");
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rdev = devm_regulator_register(dev, &rzg2l_usb_vbus_rdesc, &config);
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if (IS_ERR(rdev)) {
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of_node_put(config.of_node);
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return dev_err_probe(dev, PTR_ERR(rdev),
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"not able to register vbus regulator\n");
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}
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of_node_put(config.of_node);
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return 0;
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}
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static struct platform_driver rzg2l_usb_vbus_regulator_driver = {
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.probe = rzg2l_usb_vbus_regulator_probe,
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.driver = {
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.name = "rzg2l-usb-vbus-regulator",
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.probe_type = PROBE_PREFER_ASYNCHRONOUS,
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},
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};
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module_platform_driver(rzg2l_usb_vbus_regulator_driver);
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MODULE_AUTHOR("Biju Das <biju.das.jz@bp.renesas.com>");
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MODULE_DESCRIPTION("Renesas RZ/G2L USB Vbus Regulator Driver");
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MODULE_LICENSE("GPL");
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