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145 lines
3.4 KiB
145 lines
3.4 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* PHY driver for NXP LPC18xx/43xx internal USB OTG PHY |
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* |
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* Copyright (C) 2015 Joachim Eastwood <[email protected]> |
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*/ |
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#include <linux/clk.h> |
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#include <linux/err.h> |
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#include <linux/mfd/syscon.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/phy/phy.h> |
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#include <linux/platform_device.h> |
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#include <linux/regmap.h> |
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/* USB OTG PHY register offset and bit in CREG */ |
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#define LPC18XX_CREG_CREG0 0x004 |
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#define LPC18XX_CREG_CREG0_USB0PHY BIT(5) |
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struct lpc18xx_usb_otg_phy { |
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struct phy *phy; |
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struct clk *clk; |
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struct regmap *reg; |
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}; |
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static int lpc18xx_usb_otg_phy_init(struct phy *phy) |
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{ |
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struct lpc18xx_usb_otg_phy *lpc = phy_get_drvdata(phy); |
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int ret; |
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/* The PHY must be clocked at 480 MHz */ |
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ret = clk_set_rate(lpc->clk, 480000000); |
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if (ret) |
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return ret; |
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return clk_prepare(lpc->clk); |
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} |
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static int lpc18xx_usb_otg_phy_exit(struct phy *phy) |
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{ |
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struct lpc18xx_usb_otg_phy *lpc = phy_get_drvdata(phy); |
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clk_unprepare(lpc->clk); |
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return 0; |
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} |
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static int lpc18xx_usb_otg_phy_power_on(struct phy *phy) |
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{ |
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struct lpc18xx_usb_otg_phy *lpc = phy_get_drvdata(phy); |
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int ret; |
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ret = clk_enable(lpc->clk); |
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if (ret) |
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return ret; |
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/* The bit in CREG is cleared to enable the PHY */ |
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ret = regmap_update_bits(lpc->reg, LPC18XX_CREG_CREG0, |
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LPC18XX_CREG_CREG0_USB0PHY, 0); |
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if (ret) { |
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clk_disable(lpc->clk); |
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return ret; |
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} |
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return 0; |
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} |
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static int lpc18xx_usb_otg_phy_power_off(struct phy *phy) |
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{ |
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struct lpc18xx_usb_otg_phy *lpc = phy_get_drvdata(phy); |
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int ret; |
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ret = regmap_update_bits(lpc->reg, LPC18XX_CREG_CREG0, |
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LPC18XX_CREG_CREG0_USB0PHY, |
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LPC18XX_CREG_CREG0_USB0PHY); |
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if (ret) |
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return ret; |
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clk_disable(lpc->clk); |
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return 0; |
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} |
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static const struct phy_ops lpc18xx_usb_otg_phy_ops = { |
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.init = lpc18xx_usb_otg_phy_init, |
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.exit = lpc18xx_usb_otg_phy_exit, |
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.power_on = lpc18xx_usb_otg_phy_power_on, |
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.power_off = lpc18xx_usb_otg_phy_power_off, |
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.owner = THIS_MODULE, |
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}; |
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static int lpc18xx_usb_otg_phy_probe(struct platform_device *pdev) |
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{ |
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struct phy_provider *phy_provider; |
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struct lpc18xx_usb_otg_phy *lpc; |
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lpc = devm_kzalloc(&pdev->dev, sizeof(*lpc), GFP_KERNEL); |
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if (!lpc) |
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return -ENOMEM; |
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lpc->reg = syscon_node_to_regmap(pdev->dev.of_node->parent); |
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if (IS_ERR(lpc->reg)) { |
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dev_err(&pdev->dev, "failed to get syscon\n"); |
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return PTR_ERR(lpc->reg); |
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} |
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lpc->clk = devm_clk_get(&pdev->dev, NULL); |
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if (IS_ERR(lpc->clk)) { |
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dev_err(&pdev->dev, "failed to get clock\n"); |
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return PTR_ERR(lpc->clk); |
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} |
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lpc->phy = devm_phy_create(&pdev->dev, NULL, &lpc18xx_usb_otg_phy_ops); |
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if (IS_ERR(lpc->phy)) { |
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dev_err(&pdev->dev, "failed to create PHY\n"); |
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return PTR_ERR(lpc->phy); |
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} |
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phy_set_drvdata(lpc->phy, lpc); |
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phy_provider = devm_of_phy_provider_register(&pdev->dev, |
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of_phy_simple_xlate); |
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return PTR_ERR_OR_ZERO(phy_provider); |
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} |
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static const struct of_device_id lpc18xx_usb_otg_phy_match[] = { |
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{ .compatible = "nxp,lpc1850-usb-otg-phy" }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(of, lpc18xx_usb_otg_phy_match); |
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static struct platform_driver lpc18xx_usb_otg_phy_driver = { |
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.probe = lpc18xx_usb_otg_phy_probe, |
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.driver = { |
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.name = "lpc18xx-usb-otg-phy", |
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.of_match_table = lpc18xx_usb_otg_phy_match, |
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}, |
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}; |
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module_platform_driver(lpc18xx_usb_otg_phy_driver); |
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MODULE_AUTHOR("Joachim Eastwood <[email protected]>"); |
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MODULE_DESCRIPTION("NXP LPC18xx/43xx USB OTG PHY driver"); |
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MODULE_LICENSE("GPL v2");
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