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