109 lines
2.5 KiB
C
109 lines
2.5 KiB
C
// 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 <albeu@free.fr>
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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 <albeu@free.fr>");
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MODULE_LICENSE("GPL");
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