drivers/phy/phy-rockchip-usb.c - linux-imx - Git at Google

 /*
  * Rockchip usb PHY driver
  *
  * Copyright (C) 2014 Yunzhi Li <lyz@rock-chips.com>
  * Copyright (C) 2014 ROCKCHIP, Inc.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  */

 #include <linux/clk.h>
 #include <linux/clk-provider.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/of_platform.h>
 #include <linux/phy/phy.h>
 #include <linux/platform_device.h>
 #include <linux/regulator/consumer.h>
 #include <linux/reset.h>
 #include <linux/regmap.h>
 #include <linux/mfd/syscon.h>
 #include <linux/delay.h>

 static int enable_usb_uart;

 #define HIWORD_UPDATE(val, mask) \
 		((val) | (mask) << 16)

 #define UOC_CON0_SIDDQ BIT(13)

 struct rockchip_usb_phys {
 	int reg;
 	const char *pll_name;
 };

 struct rockchip_usb_phy_base;
 struct rockchip_usb_phy_pdata {
 	struct rockchip_usb_phys *phys;
 	int (*init_usb_uart)(struct regmap *grf);
 	int usb_uart_phy;
 };

 struct rockchip_usb_phy_base {
 	struct device *dev;
 	struct regmap *reg_base;
 	const struct rockchip_usb_phy_pdata *pdata;
 };

 struct rockchip_usb_phy {
 	struct rockchip_usb_phy_base *base;
 	struct device_node *np;
 	unsigned int	reg_offset;
 	struct clk	*clk;
 	struct clk      *clk480m;
 	struct clk_hw	clk480m_hw;
 	struct phy	*phy;
 	bool		uart_enabled;
 	struct reset_control *reset;
 };

 static int rockchip_usb_phy_power(struct rockchip_usb_phy *phy,
 					   bool siddq)
 {
 	u32 val = HIWORD_UPDATE(siddq ? UOC_CON0_SIDDQ : 0, UOC_CON0_SIDDQ);

 	return regmap_write(phy->base->reg_base, phy->reg_offset, val);
 }

 static unsigned long rockchip_usb_phy480m_recalc_rate(struct clk_hw *hw,
 						unsigned long parent_rate)
 {
 	return 480000000;
 }

 static void rockchip_usb_phy480m_disable(struct clk_hw *hw)
 {
 	struct rockchip_usb_phy *phy = container_of(hw,
 						    struct rockchip_usb_phy,
 						    clk480m_hw);

 	/* Power down usb phy analog blocks by set siddq 1 */
 	rockchip_usb_phy_power(phy, 1);
 }

 static int rockchip_usb_phy480m_enable(struct clk_hw *hw)
 {
 	struct rockchip_usb_phy *phy = container_of(hw,
 						    struct rockchip_usb_phy,
 						    clk480m_hw);

 	/* Power up usb phy analog blocks by set siddq 0 */
 	return rockchip_usb_phy_power(phy, 0);
 }

 static int rockchip_usb_phy480m_is_enabled(struct clk_hw *hw)
 {
 	struct rockchip_usb_phy *phy = container_of(hw,
 						    struct rockchip_usb_phy,
 						    clk480m_hw);
 	int ret;
 	u32 val;

 	ret = regmap_read(phy->base->reg_base, phy->reg_offset, &val);
 	if (ret < 0)
 		return ret;

 	return (val & UOC_CON0_SIDDQ) ? 0 : 1;
 }

 static const struct clk_ops rockchip_usb_phy480m_ops = {
 	.enable = rockchip_usb_phy480m_enable,
 	.disable = rockchip_usb_phy480m_disable,
 	.is_enabled = rockchip_usb_phy480m_is_enabled,
 	.recalc_rate = rockchip_usb_phy480m_recalc_rate,
 };

 static int rockchip_usb_phy_power_off(struct phy *_phy)
 {
 	struct rockchip_usb_phy *phy = phy_get_drvdata(_phy);

 	if (phy->uart_enabled)
 		return -EBUSY;

 	clk_disable_unprepare(phy->clk480m);

 	return 0;
 }

 static int rockchip_usb_phy_power_on(struct phy *_phy)
 {
 	struct rockchip_usb_phy *phy = phy_get_drvdata(_phy);

 	if (phy->uart_enabled)
 		return -EBUSY;

 	return clk_prepare_enable(phy->clk480m);
 }

 static int rockchip_usb_phy_reset(struct phy *_phy)
 {
 	struct rockchip_usb_phy *phy = phy_get_drvdata(_phy);

 	if (phy->reset) {
 		reset_control_assert(phy->reset);
 		udelay(10);
 		reset_control_deassert(phy->reset);
 	}

 	return 0;
 }

 static const struct phy_ops ops = {
 	.power_on	= rockchip_usb_phy_power_on,
 	.power_off	= rockchip_usb_phy_power_off,
 	.reset		= rockchip_usb_phy_reset,
 	.owner		= THIS_MODULE,
 };

 static void rockchip_usb_phy_action(void *data)
 {
 	struct rockchip_usb_phy *rk_phy = data;

 	if (!rk_phy->uart_enabled) {
 		of_clk_del_provider(rk_phy->np);
 		clk_unregister(rk_phy->clk480m);
 	}

 	if (rk_phy->clk)
 		clk_put(rk_phy->clk);
 }

 static int rockchip_usb_phy_init(struct rockchip_usb_phy_base *base,
 				 struct device_node *child)
 {
 	struct rockchip_usb_phy *rk_phy;
 	unsigned int reg_offset;
 	const char *clk_name;
 	struct clk_init_data init;
 	int err, i;

 	rk_phy = devm_kzalloc(base->dev, sizeof(*rk_phy), GFP_KERNEL);
 	if (!rk_phy)
 		return -ENOMEM;

 	rk_phy->base = base;
 	rk_phy->np = child;

 	if (of_property_read_u32(child, "reg", &reg_offset)) {
 		dev_err(base->dev, "missing reg property in node %s\n",
 			child->name);
 		return -EINVAL;
 	}

 	rk_phy->reset = of_reset_control_get(child, "phy-reset");
 	if (IS_ERR(rk_phy->reset))
 		rk_phy->reset = NULL;

 	rk_phy->reg_offset = reg_offset;

 	rk_phy->clk = of_clk_get_by_name(child, "phyclk");
 	if (IS_ERR(rk_phy->clk))
 		rk_phy->clk = NULL;

 	i = 0;
 	init.name = NULL;
 	while (base->pdata->phys[i].reg) {
 		if (base->pdata->phys[i].reg == reg_offset) {
 			init.name = base->pdata->phys[i].pll_name;
 			break;
 		}
 		i++;
 	}

 	if (!init.name) {
 		dev_err(base->dev, "phy data not found\n");
 		return -EINVAL;
 	}

 	if (enable_usb_uart && base->pdata->usb_uart_phy == i) {
 		dev_dbg(base->dev, "phy%d used as uart output\n", i);
 		rk_phy->uart_enabled = true;
 	} else {
 		if (rk_phy->clk) {
 			clk_name = __clk_get_name(rk_phy->clk);
 			init.flags = 0;
 			init.parent_names = &clk_name;
 			init.num_parents = 1;
 		} else {
 			init.flags = 0;
 			init.parent_names = NULL;
 			init.num_parents = 0;
 		}

 		init.ops = &rockchip_usb_phy480m_ops;
 		rk_phy->clk480m_hw.init = &init;

 		rk_phy->clk480m = clk_register(base->dev, &rk_phy->clk480m_hw);
 		if (IS_ERR(rk_phy->clk480m)) {
 			err = PTR_ERR(rk_phy->clk480m);
 			goto err_clk;
 		}

 		err = of_clk_add_provider(child, of_clk_src_simple_get,
 					rk_phy->clk480m);
 		if (err < 0)
 			goto err_clk_prov;
 	}

 	err = devm_add_action_or_reset(base->dev, rockchip_usb_phy_action,
 				       rk_phy);
 	if (err)
 		return err;

 	rk_phy->phy = devm_phy_create(base->dev, child, &ops);
 	if (IS_ERR(rk_phy->phy)) {
 		dev_err(base->dev, "failed to create PHY\n");
 		return PTR_ERR(rk_phy->phy);
 	}
 	phy_set_drvdata(rk_phy->phy, rk_phy);

 	/*
 	 * When acting as uart-pipe, just keep clock on otherwise
 	 * only power up usb phy when it use, so disable it when init
 	 */
 	if (rk_phy->uart_enabled)
 		return clk_prepare_enable(rk_phy->clk);
 	else
 		return rockchip_usb_phy_power(rk_phy, 1);

 err_clk_prov:
 	if (!rk_phy->uart_enabled)
 		clk_unregister(rk_phy->clk480m);
 err_clk:
 	if (rk_phy->clk)
 		clk_put(rk_phy->clk);
 	return err;
 }

 static const struct rockchip_usb_phy_pdata rk3066a_pdata = {
 	.phys = (struct rockchip_usb_phys[]){
 		{ .reg = 0x17c, .pll_name = "sclk_otgphy0_480m" },
 		{ .reg = 0x188, .pll_name = "sclk_otgphy1_480m" },
 		{ /* sentinel */ }
 	},
 };

 static const struct rockchip_usb_phy_pdata rk3188_pdata = {
 	.phys = (struct rockchip_usb_phys[]){
 		{ .reg = 0x10c, .pll_name = "sclk_otgphy0_480m" },
 		{ .reg = 0x11c, .pll_name = "sclk_otgphy1_480m" },
 		{ /* sentinel */ }
 	},
 };

 #define RK3288_UOC0_CON0				0x320
 #define RK3288_UOC0_CON0_COMMON_ON_N			BIT(0)
 #define RK3288_UOC0_CON0_DISABLE			BIT(4)

 #define RK3288_UOC0_CON2				0x328
 #define RK3288_UOC0_CON2_SOFT_CON_SEL			BIT(2)

 #define RK3288_UOC0_CON3				0x32c
 #define RK3288_UOC0_CON3_UTMI_SUSPENDN			BIT(0)
 #define RK3288_UOC0_CON3_UTMI_OPMODE_NODRIVING		(1 << 1)
 #define RK3288_UOC0_CON3_UTMI_OPMODE_MASK		(3 << 1)
 #define RK3288_UOC0_CON3_UTMI_XCVRSEELCT_FSTRANSC	(1 << 3)
 #define RK3288_UOC0_CON3_UTMI_XCVRSEELCT_MASK		(3 << 3)
 #define RK3288_UOC0_CON3_UTMI_TERMSEL_FULLSPEED		BIT(5)
 #define RK3288_UOC0_CON3_BYPASSDMEN			BIT(6)
 #define RK3288_UOC0_CON3_BYPASSSEL			BIT(7)

 /*
  * Enable the bypass of uart2 data through the otg usb phy.
  * Original description in the TRM.
  * 1. Disable the OTG block by setting OTGDISABLE0 to 1’b1.
  * 2. Disable the pull-up resistance on the D+ line by setting
  *    OPMODE0[1:0] to 2’b01.
  * 3. To ensure that the XO, Bias, and PLL blocks are powered down in Suspend
  *    mode, set COMMONONN to 1’b1.
  * 4. Place the USB PHY in Suspend mode by setting SUSPENDM0 to 1’b0.
  * 5. Set BYPASSSEL0 to 1’b1.
  * 6. To transmit data, controls BYPASSDMEN0, and BYPASSDMDATA0.
  * To receive data, monitor FSVPLUS0.
  *
  * The actual code in the vendor kernel does some things differently.
  */
 static int __init rk3288_init_usb_uart(struct regmap *grf)
 {
 	u32 val;
 	int ret;

 	/*
 	 * COMMON_ON and DISABLE settings are described in the TRM,
 	 * but were not present in the original code.
 	 * Also disable the analog phy components to save power.
 	 */
 	val = HIWORD_UPDATE(RK3288_UOC0_CON0_COMMON_ON_N
 				| RK3288_UOC0_CON0_DISABLE
 				| UOC_CON0_SIDDQ,
 			    RK3288_UOC0_CON0_COMMON_ON_N
 				| RK3288_UOC0_CON0_DISABLE
 				| UOC_CON0_SIDDQ);
 	ret = regmap_write(grf, RK3288_UOC0_CON0, val);
 	if (ret)
 		return ret;

 	val = HIWORD_UPDATE(RK3288_UOC0_CON2_SOFT_CON_SEL,
 			    RK3288_UOC0_CON2_SOFT_CON_SEL);
 	ret = regmap_write(grf, RK3288_UOC0_CON2, val);
 	if (ret)
 		return ret;

 	val = HIWORD_UPDATE(RK3288_UOC0_CON3_UTMI_OPMODE_NODRIVING
 				| RK3288_UOC0_CON3_UTMI_XCVRSEELCT_FSTRANSC
 				| RK3288_UOC0_CON3_UTMI_TERMSEL_FULLSPEED,
 			    RK3288_UOC0_CON3_UTMI_SUSPENDN
 				| RK3288_UOC0_CON3_UTMI_OPMODE_MASK
 				| RK3288_UOC0_CON3_UTMI_XCVRSEELCT_MASK
 				| RK3288_UOC0_CON3_UTMI_TERMSEL_FULLSPEED);
 	ret = regmap_write(grf, RK3288_UOC0_CON3, val);
 	if (ret)
 		return ret;

 	val = HIWORD_UPDATE(RK3288_UOC0_CON3_BYPASSSEL
 				| RK3288_UOC0_CON3_BYPASSDMEN,
 			    RK3288_UOC0_CON3_BYPASSSEL
 				| RK3288_UOC0_CON3_BYPASSDMEN);
 	ret = regmap_write(grf, RK3288_UOC0_CON3, val);
 	if (ret)
 		return ret;

 	return 0;
 }

 static const struct rockchip_usb_phy_pdata rk3288_pdata = {
 	.phys = (struct rockchip_usb_phys[]){
 		{ .reg = 0x320, .pll_name = "sclk_otgphy0_480m" },
 		{ .reg = 0x334, .pll_name = "sclk_otgphy1_480m" },
 		{ .reg = 0x348, .pll_name = "sclk_otgphy2_480m" },
 		{ /* sentinel */ }
 	},
 	.init_usb_uart = rk3288_init_usb_uart,
 	.usb_uart_phy = 0,
 };

 static int rockchip_usb_phy_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct rockchip_usb_phy_base *phy_base;
 	struct phy_provider *phy_provider;
 	const struct of_device_id *match;
 	struct device_node *child;
 	int err;

 	phy_base = devm_kzalloc(dev, sizeof(*phy_base), GFP_KERNEL);
 	if (!phy_base)
 		return -ENOMEM;

 	match = of_match_device(dev->driver->of_match_table, dev);
 	if (!match || !match->data) {
 		dev_err(dev, "missing phy data\n");
 		return -EINVAL;
 	}

 	phy_base->pdata = match->data;

 	phy_base->dev = dev;
 	phy_base->reg_base = ERR_PTR(-ENODEV);
 	if (dev->parent && dev->parent->of_node)
 		phy_base->reg_base = syscon_node_to_regmap(
 						dev->parent->of_node);
 	if (IS_ERR(phy_base->reg_base))
 		phy_base->reg_base = syscon_regmap_lookup_by_phandle(
 						dev->of_node, "rockchip,grf");
 	if (IS_ERR(phy_base->reg_base)) {
 		dev_err(&pdev->dev, "Missing rockchip,grf property\n");
 		return PTR_ERR(phy_base->reg_base);
 	}

 	for_each_available_child_of_node(dev->of_node, child) {
 		err = rockchip_usb_phy_init(phy_base, child);
 		if (err) {
 			of_node_put(child);
 			return err;
 		}
 	}

 	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
 	return PTR_ERR_OR_ZERO(phy_provider);
 }

 static const struct of_device_id rockchip_usb_phy_dt_ids[] = {
 	{ .compatible = "rockchip,rk3066a-usb-phy", .data = &rk3066a_pdata },
 	{ .compatible = "rockchip,rk3188-usb-phy", .data = &rk3188_pdata },
 	{ .compatible = "rockchip,rk3288-usb-phy", .data = &rk3288_pdata },
 	{}
 };

 MODULE_DEVICE_TABLE(of, rockchip_usb_phy_dt_ids);

 static struct platform_driver rockchip_usb_driver = {
 	.probe		= rockchip_usb_phy_probe,
 	.driver		= {
 		.name	= "rockchip-usb-phy",
 		.of_match_table = rockchip_usb_phy_dt_ids,
 	},
 };

 module_platform_driver(rockchip_usb_driver);

 #ifndef MODULE
 static int __init rockchip_init_usb_uart(void)
 {
 	const struct of_device_id *match;
 	const struct rockchip_usb_phy_pdata *data;
 	struct device_node *np;
 	struct regmap *grf;
 	int ret;

 	if (!enable_usb_uart)
 		return 0;

 	np = of_find_matching_node_and_match(NULL, rockchip_usb_phy_dt_ids,
 					     &match);
 	if (!np) {
 		pr_err("%s: failed to find usbphy node\n", __func__);
 		return -ENOTSUPP;
 	}

 	pr_debug("%s: using settings for %s\n", __func__, match->compatible);
 	data = match->data;

 	if (!data->init_usb_uart) {
 		pr_err("%s: usb-uart not available on %s\n",
 		       __func__, match->compatible);
 		return -ENOTSUPP;
 	}

 	grf = ERR_PTR(-ENODEV);
 	if (np->parent)
 		grf = syscon_node_to_regmap(np->parent);
 	if (IS_ERR(grf))
 		grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
 	if (IS_ERR(grf)) {
 		pr_err("%s: Missing rockchip,grf property, %lu\n",
 		       __func__, PTR_ERR(grf));
 		return PTR_ERR(grf);
 	}

 	ret = data->init_usb_uart(grf);
 	if (ret) {
 		pr_err("%s: could not init usb_uart, %d\n", __func__, ret);
 		enable_usb_uart = 0;
 		return ret;
 	}

 	return 0;
 }
 early_initcall(rockchip_init_usb_uart);

 static int __init rockchip_usb_uart(char *buf)
 {
 	enable_usb_uart = true;
 	return 0;
 }
 early_param("rockchip.usb_uart", rockchip_usb_uart);
 #endif

 MODULE_AUTHOR("Yunzhi Li <lyz@rock-chips.com>");
 MODULE_DESCRIPTION("Rockchip USB 2.0 PHY driver");
 MODULE_LICENSE("GPL v2");
	/*
	* Rockchip usb PHY driver
	*
	* Copyright (C) 2014 Yunzhi Li <lyz@rock-chips.com>
	* Copyright (C) 2014 ROCKCHIP, Inc.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*/

	#include <linux/clk.h>
	#include <linux/clk-provider.h>
	#include <linux/io.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/mutex.h>
	#include <linux/of.h>
	#include <linux/of_address.h>
	#include <linux/of_platform.h>
	#include <linux/phy/phy.h>
	#include <linux/platform_device.h>
	#include <linux/regulator/consumer.h>
	#include <linux/reset.h>
	#include <linux/regmap.h>
	#include <linux/mfd/syscon.h>
	#include <linux/delay.h>

	static int enable_usb_uart;

	#define HIWORD_UPDATE(val, mask) \
	((val) \| (mask) << 16)

	#define UOC_CON0_SIDDQ BIT(13)

	struct rockchip_usb_phys {
	int reg;
	const char *pll_name;
	};

	struct rockchip_usb_phy_base;
	struct rockchip_usb_phy_pdata {
	struct rockchip_usb_phys *phys;
	int (init_usb_uart)(struct regmap grf);
	int usb_uart_phy;
	};

	struct rockchip_usb_phy_base {
	struct device *dev;
	struct regmap *reg_base;
	const struct rockchip_usb_phy_pdata *pdata;
	};

	struct rockchip_usb_phy {
	struct rockchip_usb_phy_base *base;
	struct device_node *np;
	unsigned int reg_offset;
	struct clk *clk;
	struct clk *clk480m;
	struct clk_hw clk480m_hw;
	struct phy *phy;
	bool uart_enabled;
	struct reset_control *reset;
	};

	static int rockchip_usb_phy_power(struct rockchip_usb_phy *phy,
	bool siddq)
	{
	u32 val = HIWORD_UPDATE(siddq ? UOC_CON0_SIDDQ : 0, UOC_CON0_SIDDQ);

	return regmap_write(phy->base->reg_base, phy->reg_offset, val);
	}

	static unsigned long rockchip_usb_phy480m_recalc_rate(struct clk_hw *hw,
	unsigned long parent_rate)
	{
	return 480000000;
	}

	static void rockchip_usb_phy480m_disable(struct clk_hw *hw)
	{
	struct rockchip_usb_phy *phy = container_of(hw,
	struct rockchip_usb_phy,
	clk480m_hw);

	/* Power down usb phy analog blocks by set siddq 1 */
	rockchip_usb_phy_power(phy, 1);
	}

	static int rockchip_usb_phy480m_enable(struct clk_hw *hw)
	{
	struct rockchip_usb_phy *phy = container_of(hw,
	struct rockchip_usb_phy,
	clk480m_hw);

	/* Power up usb phy analog blocks by set siddq 0 */
	return rockchip_usb_phy_power(phy, 0);
	}

	static int rockchip_usb_phy480m_is_enabled(struct clk_hw *hw)
	{
	struct rockchip_usb_phy *phy = container_of(hw,
	struct rockchip_usb_phy,
	clk480m_hw);
	int ret;
	u32 val;

	ret = regmap_read(phy->base->reg_base, phy->reg_offset, &val);
	if (ret < 0)
	return ret;

	return (val & UOC_CON0_SIDDQ) ? 0 : 1;
	}

	static const struct clk_ops rockchip_usb_phy480m_ops = {
	.enable = rockchip_usb_phy480m_enable,
	.disable = rockchip_usb_phy480m_disable,
	.is_enabled = rockchip_usb_phy480m_is_enabled,
	.recalc_rate = rockchip_usb_phy480m_recalc_rate,
	};

	static int rockchip_usb_phy_power_off(struct phy *_phy)
	{
	struct rockchip_usb_phy *phy = phy_get_drvdata(_phy);

	if (phy->uart_enabled)
	return -EBUSY;

	clk_disable_unprepare(phy->clk480m);

	return 0;
	}

	static int rockchip_usb_phy_power_on(struct phy *_phy)
	{
	struct rockchip_usb_phy *phy = phy_get_drvdata(_phy);

	if (phy->uart_enabled)
	return -EBUSY;

	return clk_prepare_enable(phy->clk480m);
	}

	static int rockchip_usb_phy_reset(struct phy *_phy)
	{
	struct rockchip_usb_phy *phy = phy_get_drvdata(_phy);

	if (phy->reset) {
	reset_control_assert(phy->reset);
	udelay(10);
	reset_control_deassert(phy->reset);
	}

	return 0;
	}

	static const struct phy_ops ops = {
	.power_on = rockchip_usb_phy_power_on,
	.power_off = rockchip_usb_phy_power_off,
	.reset = rockchip_usb_phy_reset,
	.owner = THIS_MODULE,
	};

	static void rockchip_usb_phy_action(void *data)
	{
	struct rockchip_usb_phy *rk_phy = data;

	if (!rk_phy->uart_enabled) {
	of_clk_del_provider(rk_phy->np);
	clk_unregister(rk_phy->clk480m);
	}

	if (rk_phy->clk)
	clk_put(rk_phy->clk);
	}

	static int rockchip_usb_phy_init(struct rockchip_usb_phy_base *base,
	struct device_node *child)
	{
	struct rockchip_usb_phy *rk_phy;
	unsigned int reg_offset;
	const char *clk_name;
	struct clk_init_data init;
	int err, i;

	rk_phy = devm_kzalloc(base->dev, sizeof(*rk_phy), GFP_KERNEL);
	if (!rk_phy)
	return -ENOMEM;

	rk_phy->base = base;
	rk_phy->np = child;

	if (of_property_read_u32(child, "reg", &reg_offset)) {
	dev_err(base->dev, "missing reg property in node %s\n",
	child->name);
	return -EINVAL;
	}

	rk_phy->reset = of_reset_control_get(child, "phy-reset");
	if (IS_ERR(rk_phy->reset))
	rk_phy->reset = NULL;

	rk_phy->reg_offset = reg_offset;

	rk_phy->clk = of_clk_get_by_name(child, "phyclk");
	if (IS_ERR(rk_phy->clk))
	rk_phy->clk = NULL;

	i = 0;
	init.name = NULL;
	while (base->pdata->phys[i].reg) {
	if (base->pdata->phys[i].reg == reg_offset) {
	init.name = base->pdata->phys[i].pll_name;
	break;
	}
	i++;
	}

	if (!init.name) {
	dev_err(base->dev, "phy data not found\n");
	return -EINVAL;
	}

	if (enable_usb_uart && base->pdata->usb_uart_phy == i) {
	dev_dbg(base->dev, "phy%d used as uart output\n", i);
	rk_phy->uart_enabled = true;
	} else {
	if (rk_phy->clk) {
	clk_name = __clk_get_name(rk_phy->clk);
	init.flags = 0;
	init.parent_names = &clk_name;
	init.num_parents = 1;
	} else {
	init.flags = 0;
	init.parent_names = NULL;
	init.num_parents = 0;
	}

	init.ops = &rockchip_usb_phy480m_ops;
	rk_phy->clk480m_hw.init = &init;

	rk_phy->clk480m = clk_register(base->dev, &rk_phy->clk480m_hw);
	if (IS_ERR(rk_phy->clk480m)) {
	err = PTR_ERR(rk_phy->clk480m);
	goto err_clk;
	}

	err = of_clk_add_provider(child, of_clk_src_simple_get,
	rk_phy->clk480m);
	if (err < 0)
	goto err_clk_prov;
	}

	err = devm_add_action_or_reset(base->dev, rockchip_usb_phy_action,
	rk_phy);
	if (err)
	return err;

	rk_phy->phy = devm_phy_create(base->dev, child, &ops);
	if (IS_ERR(rk_phy->phy)) {
	dev_err(base->dev, "failed to create PHY\n");
	return PTR_ERR(rk_phy->phy);
	}
	phy_set_drvdata(rk_phy->phy, rk_phy);

	/*
	* When acting as uart-pipe, just keep clock on otherwise
	* only power up usb phy when it use, so disable it when init
	*/
	if (rk_phy->uart_enabled)
	return clk_prepare_enable(rk_phy->clk);
	else
	return rockchip_usb_phy_power(rk_phy, 1);

	err_clk_prov:
	if (!rk_phy->uart_enabled)
	clk_unregister(rk_phy->clk480m);
	err_clk:
	if (rk_phy->clk)
	clk_put(rk_phy->clk);
	return err;
	}

	static const struct rockchip_usb_phy_pdata rk3066a_pdata = {
	.phys = (struct rockchip_usb_phys[]){
	{ .reg = 0x17c, .pll_name = "sclk_otgphy0_480m" },
	{ .reg = 0x188, .pll_name = "sclk_otgphy1_480m" },
	{ /* sentinel */ }
	},
	};

	static const struct rockchip_usb_phy_pdata rk3188_pdata = {
	.phys = (struct rockchip_usb_phys[]){
	{ .reg = 0x10c, .pll_name = "sclk_otgphy0_480m" },
	{ .reg = 0x11c, .pll_name = "sclk_otgphy1_480m" },
	{ /* sentinel */ }
	},
	};

	#define RK3288_UOC0_CON0 0x320
	#define RK3288_UOC0_CON0_COMMON_ON_N BIT(0)
	#define RK3288_UOC0_CON0_DISABLE BIT(4)

	#define RK3288_UOC0_CON2 0x328
	#define RK3288_UOC0_CON2_SOFT_CON_SEL BIT(2)

	#define RK3288_UOC0_CON3 0x32c
	#define RK3288_UOC0_CON3_UTMI_SUSPENDN BIT(0)
	#define RK3288_UOC0_CON3_UTMI_OPMODE_NODRIVING (1 << 1)
	#define RK3288_UOC0_CON3_UTMI_OPMODE_MASK (3 << 1)
	#define RK3288_UOC0_CON3_UTMI_XCVRSEELCT_FSTRANSC (1 << 3)
	#define RK3288_UOC0_CON3_UTMI_XCVRSEELCT_MASK (3 << 3)
	#define RK3288_UOC0_CON3_UTMI_TERMSEL_FULLSPEED BIT(5)
	#define RK3288_UOC0_CON3_BYPASSDMEN BIT(6)
	#define RK3288_UOC0_CON3_BYPASSSEL BIT(7)

	/*
	* Enable the bypass of uart2 data through the otg usb phy.
	* Original description in the TRM.
	* 1. Disable the OTG block by setting OTGDISABLE0 to 1’b1.
	* 2. Disable the pull-up resistance on the D+ line by setting
	* OPMODE0[1:0] to 2’b01.
	* 3. To ensure that the XO, Bias, and PLL blocks are powered down in Suspend
	* mode, set COMMONONN to 1’b1.
	* 4. Place the USB PHY in Suspend mode by setting SUSPENDM0 to 1’b0.
	* 5. Set BYPASSSEL0 to 1’b1.
	* 6. To transmit data, controls BYPASSDMEN0, and BYPASSDMDATA0.
	* To receive data, monitor FSVPLUS0.
	*
	* The actual code in the vendor kernel does some things differently.
	*/
	static int __init rk3288_init_usb_uart(struct regmap *grf)
	{
	u32 val;
	int ret;

	/*
	* COMMON_ON and DISABLE settings are described in the TRM,
	* but were not present in the original code.
	* Also disable the analog phy components to save power.
	*/
	val = HIWORD_UPDATE(RK3288_UOC0_CON0_COMMON_ON_N
	\| RK3288_UOC0_CON0_DISABLE
	\| UOC_CON0_SIDDQ,
	RK3288_UOC0_CON0_COMMON_ON_N
	\| RK3288_UOC0_CON0_DISABLE
	\| UOC_CON0_SIDDQ);
	ret = regmap_write(grf, RK3288_UOC0_CON0, val);
	if (ret)
	return ret;

	val = HIWORD_UPDATE(RK3288_UOC0_CON2_SOFT_CON_SEL,
	RK3288_UOC0_CON2_SOFT_CON_SEL);
	ret = regmap_write(grf, RK3288_UOC0_CON2, val);
	if (ret)
	return ret;

	val = HIWORD_UPDATE(RK3288_UOC0_CON3_UTMI_OPMODE_NODRIVING
	\| RK3288_UOC0_CON3_UTMI_XCVRSEELCT_FSTRANSC
	\| RK3288_UOC0_CON3_UTMI_TERMSEL_FULLSPEED,
	RK3288_UOC0_CON3_UTMI_SUSPENDN
	\| RK3288_UOC0_CON3_UTMI_OPMODE_MASK
	\| RK3288_UOC0_CON3_UTMI_XCVRSEELCT_MASK
	\| RK3288_UOC0_CON3_UTMI_TERMSEL_FULLSPEED);
	ret = regmap_write(grf, RK3288_UOC0_CON3, val);
	if (ret)
	return ret;

	val = HIWORD_UPDATE(RK3288_UOC0_CON3_BYPASSSEL
	\| RK3288_UOC0_CON3_BYPASSDMEN,
	RK3288_UOC0_CON3_BYPASSSEL
	\| RK3288_UOC0_CON3_BYPASSDMEN);
	ret = regmap_write(grf, RK3288_UOC0_CON3, val);
	if (ret)
	return ret;

	return 0;
	}

	static const struct rockchip_usb_phy_pdata rk3288_pdata = {
	.phys = (struct rockchip_usb_phys[]){
	{ .reg = 0x320, .pll_name = "sclk_otgphy0_480m" },
	{ .reg = 0x334, .pll_name = "sclk_otgphy1_480m" },
	{ .reg = 0x348, .pll_name = "sclk_otgphy2_480m" },
	{ /* sentinel */ }
	},
	.init_usb_uart = rk3288_init_usb_uart,
	.usb_uart_phy = 0,
	};

	static int rockchip_usb_phy_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct rockchip_usb_phy_base *phy_base;
	struct phy_provider *phy_provider;
	const struct of_device_id *match;
	struct device_node *child;
	int err;

	phy_base = devm_kzalloc(dev, sizeof(*phy_base), GFP_KERNEL);
	if (!phy_base)
	return -ENOMEM;

	match = of_match_device(dev->driver->of_match_table, dev);
	if (!match \|\| !match->data) {
	dev_err(dev, "missing phy data\n");
	return -EINVAL;
	}

	phy_base->pdata = match->data;

	phy_base->dev = dev;
	phy_base->reg_base = ERR_PTR(-ENODEV);
	if (dev->parent && dev->parent->of_node)
	phy_base->reg_base = syscon_node_to_regmap(
	dev->parent->of_node);
	if (IS_ERR(phy_base->reg_base))
	phy_base->reg_base = syscon_regmap_lookup_by_phandle(
	dev->of_node, "rockchip,grf");
	if (IS_ERR(phy_base->reg_base)) {
	dev_err(&pdev->dev, "Missing rockchip,grf property\n");
	return PTR_ERR(phy_base->reg_base);
	}

	for_each_available_child_of_node(dev->of_node, child) {
	err = rockchip_usb_phy_init(phy_base, child);
	if (err) {
	of_node_put(child);
	return err;
	}
	}

	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
	return PTR_ERR_OR_ZERO(phy_provider);
	}

	static const struct of_device_id rockchip_usb_phy_dt_ids[] = {
	{ .compatible = "rockchip,rk3066a-usb-phy", .data = &rk3066a_pdata },
	{ .compatible = "rockchip,rk3188-usb-phy", .data = &rk3188_pdata },
	{ .compatible = "rockchip,rk3288-usb-phy", .data = &rk3288_pdata },
	{}
	};

	MODULE_DEVICE_TABLE(of, rockchip_usb_phy_dt_ids);

	static struct platform_driver rockchip_usb_driver = {
	.probe = rockchip_usb_phy_probe,
	.driver = {
	.name = "rockchip-usb-phy",
	.of_match_table = rockchip_usb_phy_dt_ids,
	},
	};

	module_platform_driver(rockchip_usb_driver);

	#ifndef MODULE
	static int __init rockchip_init_usb_uart(void)
	{
	const struct of_device_id *match;
	const struct rockchip_usb_phy_pdata *data;
	struct device_node *np;
	struct regmap *grf;
	int ret;

	if (!enable_usb_uart)
	return 0;

	np = of_find_matching_node_and_match(NULL, rockchip_usb_phy_dt_ids,
	&match);
	if (!np) {
	pr_err("%s: failed to find usbphy node\n", __func__);
	return -ENOTSUPP;
	}

	pr_debug("%s: using settings for %s\n", __func__, match->compatible);
	data = match->data;

	if (!data->init_usb_uart) {
	pr_err("%s: usb-uart not available on %s\n",
	__func__, match->compatible);
	return -ENOTSUPP;
	}

	grf = ERR_PTR(-ENODEV);
	if (np->parent)
	grf = syscon_node_to_regmap(np->parent);
	if (IS_ERR(grf))
	grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
	if (IS_ERR(grf)) {
	pr_err("%s: Missing rockchip,grf property, %lu\n",
	__func__, PTR_ERR(grf));
	return PTR_ERR(grf);
	}

	ret = data->init_usb_uart(grf);
	if (ret) {
	pr_err("%s: could not init usb_uart, %d\n", __func__, ret);
	enable_usb_uart = 0;
	return ret;
	}

	return 0;
	}
	early_initcall(rockchip_init_usb_uart);

	static int __init rockchip_usb_uart(char *buf)
	{
	enable_usb_uart = true;
	return 0;
	}
	early_param("rockchip.usb_uart", rockchip_usb_uart);
	#endif

	MODULE_AUTHOR("Yunzhi Li <lyz@rock-chips.com>");
	MODULE_DESCRIPTION("Rockchip USB 2.0 PHY driver");
	MODULE_LICENSE("GPL v2");