Eric Lee / smarc-fsl-linux-kernel

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drivers/phy/phy-lpc18xx-usb-otg.c 3.35 KB
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d2912cb15   Thomas Gleixner   treewide: Replace... 
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  // SPDX-License-Identifier: GPL-2.0-only
cbf919bd3   Joachim Eastwood   phy: add lpc18xx ... 
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  /*
   * PHY driver for NXP LPC18xx/43xx internal USB OTG PHY
   *
   * Copyright (C) 2015 Joachim Eastwood <manabian@gmail.com>
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   */
  
  #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;
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  	/* The PHY must be clocked at 480 MHz */
  	ret = clk_set_rate(lpc->clk, 480000000);
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  	if (ret)
  		return ret;
cfd093bbb   Joachim Eastwood   phy: lpc18xx-usb-... 
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  	return clk_prepare(lpc->clk);
cbf919bd3   Joachim Eastwood   phy: add lpc18xx ... 
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  }
  
  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 */
124380cb0   Alexey Khoroshilov   phy: lpc18xx-usb-... 
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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) {
  		clk_disable(lpc->clk);
  		return ret;
  	}
  
  	return 0;
cbf919bd3   Joachim Eastwood   phy: add lpc18xx ... 
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  }
  
  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
  ");
  		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
  ");
  		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
  ");
  		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");