744e004bf2
The .remove() callback for a platform driver returns an int which makes many driver authors wrongly assume it's possible to do error handling by returning an error code. However the value returned is (mostly) ignored and this typically results in resource leaks. To improve here there is a quest to make the remove callback return void. In the first step of this quest all drivers are converted to .remove_new() which already returns void. Trivially convert this driver from always returning zero in the remove callback to the void returning variant. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Link: https://lore.kernel.org/r/20230319092428.283054-7-u.kleine-koenig@pengutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
118 lines
2.9 KiB
C
118 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* phy-keystone - USB PHY, talking to dwc3 controller in Keystone.
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*
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* Copyright (C) 2013 Texas Instruments Incorporated - https://www.ti.com
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*
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* Author: WingMan Kwok <w-kwok2@ti.com>
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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/usb/usb_phy_generic.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include "phy-generic.h"
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/* USB PHY control register offsets */
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#define USB_PHY_CTL_UTMI 0x0000
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#define USB_PHY_CTL_PIPE 0x0004
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#define USB_PHY_CTL_PARAM_1 0x0008
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#define USB_PHY_CTL_PARAM_2 0x000c
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#define USB_PHY_CTL_CLOCK 0x0010
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#define USB_PHY_CTL_PLL 0x0014
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#define PHY_REF_SSP_EN BIT(29)
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struct keystone_usbphy {
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struct usb_phy_generic usb_phy_gen;
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void __iomem *phy_ctrl;
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};
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static inline u32 keystone_usbphy_readl(void __iomem *base, u32 offset)
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{
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return readl(base + offset);
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}
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static inline void keystone_usbphy_writel(void __iomem *base,
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u32 offset, u32 value)
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{
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writel(value, base + offset);
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}
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static int keystone_usbphy_init(struct usb_phy *phy)
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{
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struct keystone_usbphy *k_phy = dev_get_drvdata(phy->dev);
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u32 val;
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val = keystone_usbphy_readl(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK);
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keystone_usbphy_writel(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK,
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val | PHY_REF_SSP_EN);
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return 0;
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}
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static void keystone_usbphy_shutdown(struct usb_phy *phy)
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{
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struct keystone_usbphy *k_phy = dev_get_drvdata(phy->dev);
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u32 val;
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val = keystone_usbphy_readl(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK);
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keystone_usbphy_writel(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK,
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val & ~PHY_REF_SSP_EN);
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}
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static int keystone_usbphy_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct keystone_usbphy *k_phy;
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int ret;
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k_phy = devm_kzalloc(dev, sizeof(*k_phy), GFP_KERNEL);
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if (!k_phy)
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return -ENOMEM;
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k_phy->phy_ctrl = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(k_phy->phy_ctrl))
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return PTR_ERR(k_phy->phy_ctrl);
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ret = usb_phy_gen_create_phy(dev, &k_phy->usb_phy_gen);
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if (ret)
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return ret;
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k_phy->usb_phy_gen.phy.init = keystone_usbphy_init;
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k_phy->usb_phy_gen.phy.shutdown = keystone_usbphy_shutdown;
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platform_set_drvdata(pdev, k_phy);
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return usb_add_phy_dev(&k_phy->usb_phy_gen.phy);
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}
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static void keystone_usbphy_remove(struct platform_device *pdev)
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{
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struct keystone_usbphy *k_phy = platform_get_drvdata(pdev);
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usb_remove_phy(&k_phy->usb_phy_gen.phy);
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}
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static const struct of_device_id keystone_usbphy_ids[] = {
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{ .compatible = "ti,keystone-usbphy" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, keystone_usbphy_ids);
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static struct platform_driver keystone_usbphy_driver = {
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.probe = keystone_usbphy_probe,
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.remove_new = keystone_usbphy_remove,
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.driver = {
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.name = "keystone-usbphy",
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.of_match_table = keystone_usbphy_ids,
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},
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};
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module_platform_driver(keystone_usbphy_driver);
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MODULE_ALIAS("platform:keystone-usbphy");
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MODULE_AUTHOR("Texas Instruments Inc.");
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MODULE_DESCRIPTION("Keystone USB phy driver");
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MODULE_LICENSE("GPL v2");
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