mirror of https://gitee.com/openkylin/linux.git
109 lines
2.5 KiB
C
109 lines
2.5 KiB
C
// 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_deassert(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, "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");
|