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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/phy/qualcomm/phy-ath79-usb.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/phy/qualcomm/phy-ath79-usb.c')
-rw-r--r-- | drivers/phy/qualcomm/phy-ath79-usb.c | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/drivers/phy/qualcomm/phy-ath79-usb.c b/drivers/phy/qualcomm/phy-ath79-usb.c new file mode 100644 index 000000000..09a77e556 --- /dev/null +++ b/drivers/phy/qualcomm/phy-ath79-usb.c @@ -0,0 +1,108 @@ +// 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"); |