| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0+ |
| 2 | /* |
| 3 | * Atheros AR71XX/9XXX USB PHY driver |
| 4 | * |
| 5 | * Copyright (C) 2015-2018 Alban Bedel <albeu@free.fr> |
| 6 | */ |
| 7 | |
| 8 | #include <linux/module.h> |
| 9 | #include <linux/platform_device.h> |
| 10 | #include <linux/phy/phy.h> |
| 11 | #include <linux/reset.h> |
| 12 | |
| 13 | struct ath79_usb_phy { |
| 14 | struct reset_control *reset; |
| 15 | /* The suspend override logic is inverted, hence the no prefix |
| 16 | * to make the code a bit easier to understand. |
| 17 | */ |
| 18 | struct reset_control *no_suspend_override; |
| 19 | }; |
| 20 | |
| 21 | static int ath79_usb_phy_power_on(struct phy *phy) |
| 22 | { |
| 23 | struct ath79_usb_phy *priv = phy_get_drvdata(phy); |
| 24 | int err = 0; |
| 25 | |
| 26 | if (priv->no_suspend_override) { |
| 27 | err = reset_control_assert(priv->no_suspend_override); |
| 28 | if (err) |
| 29 | return err; |
| 30 | } |
| 31 | |
| 32 | err = reset_control_deassert(priv->reset); |
| 33 | if (err && priv->no_suspend_override) |
| 34 | reset_control_deassert(priv->no_suspend_override); |
| 35 | |
| 36 | return err; |
| 37 | } |
| 38 | |
| 39 | static int ath79_usb_phy_power_off(struct phy *phy) |
| 40 | { |
| 41 | struct ath79_usb_phy *priv = phy_get_drvdata(phy); |
| 42 | int err = 0; |
| 43 | |
| 44 | err = reset_control_assert(priv->reset); |
| 45 | if (err) |
| 46 | return err; |
| 47 | |
| 48 | if (priv->no_suspend_override) { |
| 49 | err = reset_control_deassert(priv->no_suspend_override); |
| 50 | if (err) |
| 51 | reset_control_deassert(priv->reset); |
| 52 | } |
| 53 | |
| 54 | return err; |
| 55 | } |
| 56 | |
| 57 | static const struct phy_ops ath79_usb_phy_ops = { |
| 58 | .power_on = ath79_usb_phy_power_on, |
| 59 | .power_off = ath79_usb_phy_power_off, |
| 60 | .owner = THIS_MODULE, |
| 61 | }; |
| 62 | |
| 63 | static int ath79_usb_phy_probe(struct platform_device *pdev) |
| 64 | { |
| 65 | struct ath79_usb_phy *priv; |
| 66 | struct phy *phy; |
| 67 | |
| 68 | priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); |
| 69 | if (!priv) |
| 70 | return -ENOMEM; |
| 71 | |
| 72 | priv->reset = devm_reset_control_get(&pdev->dev, "phy"); |
| 73 | if (IS_ERR(priv->reset)) |
| 74 | return PTR_ERR(priv->reset); |
| 75 | |
| 76 | priv->no_suspend_override = devm_reset_control_get_optional( |
| 77 | &pdev->dev, "usb-suspend-override"); |
| 78 | if (IS_ERR(priv->no_suspend_override)) |
| 79 | return PTR_ERR(priv->no_suspend_override); |
| 80 | |
| 81 | phy = devm_phy_create(&pdev->dev, NULL, &ath79_usb_phy_ops); |
| 82 | if (IS_ERR(phy)) |
| 83 | return PTR_ERR(phy); |
| 84 | |
| 85 | phy_set_drvdata(phy, priv); |
| 86 | |
| 87 | return PTR_ERR_OR_ZERO(devm_of_phy_provider_register( |
| 88 | &pdev->dev, of_phy_simple_xlate)); |
| 89 | } |
| 90 | |
| 91 | static const struct of_device_id ath79_usb_phy_of_match[] = { |
| 92 | { .compatible = "qca,ar7100-usb-phy" }, |
| 93 | {} |
| 94 | }; |
| 95 | MODULE_DEVICE_TABLE(of, ath79_usb_phy_of_match); |
| 96 | |
| 97 | static struct platform_driver ath79_usb_phy_driver = { |
| 98 | .probe = ath79_usb_phy_probe, |
| 99 | .driver = { |
| 100 | .of_match_table = ath79_usb_phy_of_match, |
| 101 | .name = "ath79-usb-phy", |
| 102 | } |
| 103 | }; |
| 104 | module_platform_driver(ath79_usb_phy_driver); |
| 105 | |
| 106 | MODULE_DESCRIPTION("ATH79 USB PHY driver"); |
| 107 | MODULE_AUTHOR("Alban Bedel <albeu@free.fr>"); |
| 108 | MODULE_LICENSE("GPL"); |