| 1 | // SPDX-License-Identifier: GPL-2.0 |
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| 2 | // |
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| 3 | // Renesas USB VBUS output regulator driver |
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| 4 | // |
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| 5 | // Copyright (C) 2024 Renesas Electronics Corporation |
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| 6 | // |
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| 7 | |
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| 8 | #include <linux/module.h> |
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| 9 | #include <linux/err.h> |
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| 10 | #include <linux/kernel.h> |
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| 11 | #include <linux/of.h> |
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| 12 | #include <linux/platform_device.h> |
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| 13 | #include <linux/regmap.h> |
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| 14 | #include <linux/regulator/driver.h> |
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| 15 | #include <linux/regulator/of_regulator.h> |
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| 16 | |
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| 17 | static const struct regulator_ops rzg2l_usb_vbus_reg_ops = { |
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| 18 | .enable = regulator_enable_regmap, |
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| 19 | .disable = regulator_disable_regmap, |
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| 20 | .is_enabled = regulator_is_enabled_regmap, |
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| 21 | }; |
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| 22 | |
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| 23 | static const struct regulator_desc rzg2l_usb_vbus_rdesc = { |
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| 24 | .name = "vbus" , |
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| 25 | .of_match = of_match_ptr("regulator-vbus" ), |
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| 26 | .ops = &rzg2l_usb_vbus_reg_ops, |
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| 27 | .type = REGULATOR_VOLTAGE, |
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| 28 | .owner = THIS_MODULE, |
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| 29 | .enable_reg = 0, |
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| 30 | .enable_mask = BIT(0), |
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| 31 | .enable_is_inverted = true, |
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| 32 | .fixed_uV = 5000000, |
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| 33 | .n_voltages = 1, |
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| 34 | }; |
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| 35 | |
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| 36 | static int rzg2l_usb_vbus_regulator_probe(struct platform_device *pdev) |
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| 37 | { |
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| 38 | struct regulator_config config = { }; |
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| 39 | struct device *dev = &pdev->dev; |
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| 40 | struct regulator_dev *rdev; |
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| 41 | |
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| 42 | config.regmap = dev_get_regmap(dev: dev->parent, NULL); |
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| 43 | if (!config.regmap) |
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| 44 | return dev_err_probe(dev, err: -ENOENT, fmt: "Failed to get regmap\n" ); |
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| 45 | |
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| 46 | config.dev = dev; |
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| 47 | config.of_node = of_get_child_by_name(node: dev->parent->of_node, name: "regulator-vbus" ); |
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| 48 | if (!config.of_node) |
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| 49 | return dev_err_probe(dev, err: -ENODEV, fmt: "regulator node not found\n" ); |
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| 50 | |
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| 51 | rdev = devm_regulator_register(dev, regulator_desc: &rzg2l_usb_vbus_rdesc, config: &config); |
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| 52 | of_node_put(node: config.of_node); |
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| 53 | if (IS_ERR(ptr: rdev)) |
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| 54 | return dev_err_probe(dev, err: PTR_ERR(ptr: rdev), |
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| 55 | fmt: "not able to register vbus regulator\n" ); |
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| 56 | |
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| 57 | return 0; |
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| 58 | } |
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| 59 | |
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| 60 | static struct platform_driver rzg2l_usb_vbus_regulator_driver = { |
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| 61 | .probe = rzg2l_usb_vbus_regulator_probe, |
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| 62 | .driver = { |
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| 63 | .name = "rzg2l-usb-vbus-regulator" , |
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| 64 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, |
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| 65 | }, |
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| 66 | }; |
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| 67 | module_platform_driver(rzg2l_usb_vbus_regulator_driver); |
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| 68 | |
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| 69 | MODULE_AUTHOR("Biju Das <biju.das.jz@bp.renesas.com>" ); |
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| 70 | MODULE_DESCRIPTION("Renesas RZ/G2L USB Vbus Regulator Driver" ); |
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| 71 | MODULE_LICENSE("GPL" ); |
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| 72 | |
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