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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * PHY driver for NXP LPC18xx/43xx internal USB OTG PHY4 *5 * Copyright (C) 2015 Joachim Eastwood <manabian@gmail.com>6 */7 8#include <linux/clk.h>9#include <linux/err.h>10#include <linux/mfd/syscon.h>11#include <linux/module.h>12#include <linux/of.h>13#include <linux/phy/phy.h>14#include <linux/platform_device.h>15#include <linux/regmap.h>16 17/* USB OTG PHY register offset and bit in CREG */18#define LPC18XX_CREG_CREG0 0x00419#define LPC18XX_CREG_CREG0_USB0PHY BIT(5)20 21struct lpc18xx_usb_otg_phy {22 struct phy *phy;23 struct clk *clk;24 struct regmap *reg;25};26 27static int lpc18xx_usb_otg_phy_init(struct phy *phy)28{29 struct lpc18xx_usb_otg_phy *lpc = phy_get_drvdata(phy);30 int ret;31 32 /* The PHY must be clocked at 480 MHz */33 ret = clk_set_rate(lpc->clk, 480000000);34 if (ret)35 return ret;36 37 return clk_prepare(lpc->clk);38}39 40static int lpc18xx_usb_otg_phy_exit(struct phy *phy)41{42 struct lpc18xx_usb_otg_phy *lpc = phy_get_drvdata(phy);43 44 clk_unprepare(lpc->clk);45 46 return 0;47}48 49static int lpc18xx_usb_otg_phy_power_on(struct phy *phy)50{51 struct lpc18xx_usb_otg_phy *lpc = phy_get_drvdata(phy);52 int ret;53 54 ret = clk_enable(lpc->clk);55 if (ret)56 return ret;57 58 /* The bit in CREG is cleared to enable the PHY */59 ret = regmap_update_bits(lpc->reg, LPC18XX_CREG_CREG0,60 LPC18XX_CREG_CREG0_USB0PHY, 0);61 if (ret) {62 clk_disable(lpc->clk);63 return ret;64 }65 66 return 0;67}68 69static int lpc18xx_usb_otg_phy_power_off(struct phy *phy)70{71 struct lpc18xx_usb_otg_phy *lpc = phy_get_drvdata(phy);72 int ret;73 74 ret = regmap_update_bits(lpc->reg, LPC18XX_CREG_CREG0,75 LPC18XX_CREG_CREG0_USB0PHY,76 LPC18XX_CREG_CREG0_USB0PHY);77 if (ret)78 return ret;79 80 clk_disable(lpc->clk);81 82 return 0;83}84 85static const struct phy_ops lpc18xx_usb_otg_phy_ops = {86 .init = lpc18xx_usb_otg_phy_init,87 .exit = lpc18xx_usb_otg_phy_exit,88 .power_on = lpc18xx_usb_otg_phy_power_on,89 .power_off = lpc18xx_usb_otg_phy_power_off,90 .owner = THIS_MODULE,91};92 93static int lpc18xx_usb_otg_phy_probe(struct platform_device *pdev)94{95 struct phy_provider *phy_provider;96 struct lpc18xx_usb_otg_phy *lpc;97 98 lpc = devm_kzalloc(&pdev->dev, sizeof(*lpc), GFP_KERNEL);99 if (!lpc)100 return -ENOMEM;101 102 lpc->reg = syscon_node_to_regmap(pdev->dev.of_node->parent);103 if (IS_ERR(lpc->reg)) {104 dev_err(&pdev->dev, "failed to get syscon\n");105 return PTR_ERR(lpc->reg);106 }107 108 lpc->clk = devm_clk_get(&pdev->dev, NULL);109 if (IS_ERR(lpc->clk)) {110 dev_err(&pdev->dev, "failed to get clock\n");111 return PTR_ERR(lpc->clk);112 }113 114 lpc->phy = devm_phy_create(&pdev->dev, NULL, &lpc18xx_usb_otg_phy_ops);115 if (IS_ERR(lpc->phy)) {116 dev_err(&pdev->dev, "failed to create PHY\n");117 return PTR_ERR(lpc->phy);118 }119 120 phy_set_drvdata(lpc->phy, lpc);121 122 phy_provider = devm_of_phy_provider_register(&pdev->dev,123 of_phy_simple_xlate);124 125 return PTR_ERR_OR_ZERO(phy_provider);126}127 128static const struct of_device_id lpc18xx_usb_otg_phy_match[] = {129 { .compatible = "nxp,lpc1850-usb-otg-phy" },130 { }131};132MODULE_DEVICE_TABLE(of, lpc18xx_usb_otg_phy_match);133 134static struct platform_driver lpc18xx_usb_otg_phy_driver = {135 .probe = lpc18xx_usb_otg_phy_probe,136 .driver = {137 .name = "lpc18xx-usb-otg-phy",138 .of_match_table = lpc18xx_usb_otg_phy_match,139 },140};141module_platform_driver(lpc18xx_usb_otg_phy_driver);142 143MODULE_AUTHOR("Joachim Eastwood <manabian@gmail.com>");144MODULE_DESCRIPTION("NXP LPC18xx/43xx USB OTG PHY driver");145MODULE_LICENSE("GPL v2");146