/* * PHY driver for NXP LPC18xx/43xx internal USB OTG PHY * * Copyright (C) 2015 Joachim Eastwood <manabian@gmail.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * */ #include <linux/clk.h> #include <linux/err.h> #include <linux/mfd/syscon.h> #include <linux/module.h> #include <linux/of.h> #include <linux/phy/phy.h> #include <linux/platform_device.h> #include <linux/regmap.h> /* USB OTG PHY register offset and bit in CREG */ #define LPC18XX_CREG_CREG0 0x004 #define LPC18XX_CREG_CREG0_USB0PHY BIT(5) struct lpc18xx_usb_otg_phy { struct phy *phy; struct clk *clk; struct regmap *reg; }; static int lpc18xx_usb_otg_phy_init(struct phy *phy) { struct lpc18xx_usb_otg_phy *lpc = phy_get_drvdata(phy); int ret; /* The PHY must be clocked at 480 MHz */ ret = clk_set_rate(lpc->clk, 480000000); if (ret) return ret; return clk_prepare(lpc->clk); } static int lpc18xx_usb_otg_phy_exit(struct phy *phy) { struct lpc18xx_usb_otg_phy *lpc = phy_get_drvdata(phy); clk_unprepare(lpc->clk); return 0; } static int lpc18xx_usb_otg_phy_power_on(struct phy *phy) { struct lpc18xx_usb_otg_phy *lpc = phy_get_drvdata(phy); int ret; ret = clk_enable(lpc->clk); if (ret) return ret; /* The bit in CREG is cleared to enable the PHY */ ret = regmap_update_bits(lpc->reg, LPC18XX_CREG_CREG0, LPC18XX_CREG_CREG0_USB0PHY, 0); if (ret) { clk_disable(lpc->clk); return ret; } return 0; } static int lpc18xx_usb_otg_phy_power_off(struct phy *phy) { struct lpc18xx_usb_otg_phy *lpc = phy_get_drvdata(phy); int ret; ret = regmap_update_bits(lpc->reg, LPC18XX_CREG_CREG0, LPC18XX_CREG_CREG0_USB0PHY, LPC18XX_CREG_CREG0_USB0PHY); if (ret) return ret; clk_disable(lpc->clk); return 0; } static const struct phy_ops lpc18xx_usb_otg_phy_ops = { .init = lpc18xx_usb_otg_phy_init, .exit = lpc18xx_usb_otg_phy_exit, .power_on = lpc18xx_usb_otg_phy_power_on, .power_off = lpc18xx_usb_otg_phy_power_off, .owner = THIS_MODULE, }; static int lpc18xx_usb_otg_phy_probe(struct platform_device *pdev) { struct phy_provider *phy_provider; struct lpc18xx_usb_otg_phy *lpc; lpc = devm_kzalloc(&pdev->dev, sizeof(*lpc), GFP_KERNEL); if (!lpc) return -ENOMEM; lpc->reg = syscon_node_to_regmap(pdev->dev.of_node->parent); if (IS_ERR(lpc->reg)) { dev_err(&pdev->dev, "failed to get syscon\n"); return PTR_ERR(lpc->reg); } lpc->clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(lpc->clk)) { dev_err(&pdev->dev, "failed to get clock\n"); return PTR_ERR(lpc->clk); } lpc->phy = devm_phy_create(&pdev->dev, NULL, &lpc18xx_usb_otg_phy_ops); if (IS_ERR(lpc->phy)) { dev_err(&pdev->dev, "failed to create PHY\n"); return PTR_ERR(lpc->phy); } phy_set_drvdata(lpc->phy, lpc); phy_provider = devm_of_phy_provider_register(&pdev->dev, of_phy_simple_xlate); return PTR_ERR_OR_ZERO(phy_provider); } static const struct of_device_id lpc18xx_usb_otg_phy_match[] = { { .compatible = "nxp,lpc1850-usb-otg-phy" }, { } }; MODULE_DEVICE_TABLE(of, lpc18xx_usb_otg_phy_match); static struct platform_driver lpc18xx_usb_otg_phy_driver = { .probe = lpc18xx_usb_otg_phy_probe, .driver = { .name = "lpc18xx-usb-otg-phy", .of_match_table = lpc18xx_usb_otg_phy_match, }, }; module_platform_driver(lpc18xx_usb_otg_phy_driver); MODULE_AUTHOR("Joachim Eastwood <manabian@gmail.com>"); MODULE_DESCRIPTION("NXP LPC18xx/43xx USB OTG PHY driver"); MODULE_LICENSE("GPL v2");