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108 lines
2.5 KiB
108 lines
2.5 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Atheros AR71XX/9XXX USB PHY driver |
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* |
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* Copyright (C) 2015-2018 Alban Bedel <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/phy/phy.h> |
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#include <linux/reset.h> |
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struct ath79_usb_phy { |
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struct reset_control *reset; |
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/* The suspend override logic is inverted, hence the no prefix |
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* to make the code a bit easier to understand. |
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*/ |
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struct reset_control *no_suspend_override; |
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}; |
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static int ath79_usb_phy_power_on(struct phy *phy) |
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{ |
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struct ath79_usb_phy *priv = phy_get_drvdata(phy); |
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int err = 0; |
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if (priv->no_suspend_override) { |
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err = reset_control_assert(priv->no_suspend_override); |
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if (err) |
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return err; |
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} |
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err = reset_control_deassert(priv->reset); |
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if (err && priv->no_suspend_override) |
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reset_control_deassert(priv->no_suspend_override); |
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return err; |
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} |
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static int ath79_usb_phy_power_off(struct phy *phy) |
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{ |
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struct ath79_usb_phy *priv = phy_get_drvdata(phy); |
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int err = 0; |
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err = reset_control_assert(priv->reset); |
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if (err) |
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return err; |
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if (priv->no_suspend_override) { |
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err = reset_control_deassert(priv->no_suspend_override); |
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if (err) |
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reset_control_deassert(priv->reset); |
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} |
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return err; |
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} |
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static const struct phy_ops ath79_usb_phy_ops = { |
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.power_on = ath79_usb_phy_power_on, |
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.power_off = ath79_usb_phy_power_off, |
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.owner = THIS_MODULE, |
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}; |
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static int ath79_usb_phy_probe(struct platform_device *pdev) |
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{ |
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struct ath79_usb_phy *priv; |
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struct phy *phy; |
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priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); |
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if (!priv) |
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return -ENOMEM; |
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priv->reset = devm_reset_control_get(&pdev->dev, "phy"); |
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if (IS_ERR(priv->reset)) |
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return PTR_ERR(priv->reset); |
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priv->no_suspend_override = devm_reset_control_get_optional( |
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&pdev->dev, "usb-suspend-override"); |
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if (IS_ERR(priv->no_suspend_override)) |
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return PTR_ERR(priv->no_suspend_override); |
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phy = devm_phy_create(&pdev->dev, NULL, &ath79_usb_phy_ops); |
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if (IS_ERR(phy)) |
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return PTR_ERR(phy); |
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phy_set_drvdata(phy, priv); |
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return PTR_ERR_OR_ZERO(devm_of_phy_provider_register( |
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&pdev->dev, of_phy_simple_xlate)); |
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} |
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static const struct of_device_id ath79_usb_phy_of_match[] = { |
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{ .compatible = "qca,ar7100-usb-phy" }, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(of, ath79_usb_phy_of_match); |
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static struct platform_driver ath79_usb_phy_driver = { |
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.probe = ath79_usb_phy_probe, |
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.driver = { |
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.of_match_table = ath79_usb_phy_of_match, |
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.name = "ath79-usb-phy", |
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} |
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}; |
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module_platform_driver(ath79_usb_phy_driver); |
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MODULE_DESCRIPTION("ATH79 USB PHY driver"); |
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MODULE_AUTHOR("Alban Bedel <[email protected]>"); |
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MODULE_LICENSE("GPL");
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