drivers/phy/phy-stm32-usbphyc.c - uboot-imx - Git at Google

 // SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
 /*
  * Copyright (C) 2018, STMicroelectronics - All Rights Reserved
  */

 #include <common.h>
 #include <clk.h>
 #include <div64.h>
 #include <dm.h>
 #include <fdtdec.h>
 #include <generic-phy.h>
 #include <reset.h>
 #include <syscon.h>
 #include <usb.h>
 #include <asm/io.h>
 #include <linux/bitops.h>
 #include <power/regulator.h>

 /* USBPHYC registers */
 #define STM32_USBPHYC_PLL	0x0
 #define STM32_USBPHYC_MISC	0x8

 /* STM32_USBPHYC_PLL bit fields */
 #define PLLNDIV			GENMASK(6, 0)
 #define PLLNDIV_SHIFT		0
 #define PLLFRACIN		GENMASK(25, 10)
 #define PLLFRACIN_SHIFT		10
 #define PLLEN			BIT(26)
 #define PLLSTRB			BIT(27)
 #define PLLSTRBYP		BIT(28)
 #define PLLFRACCTL		BIT(29)
 #define PLLDITHEN0		BIT(30)
 #define PLLDITHEN1		BIT(31)

 /* STM32_USBPHYC_MISC bit fields */
 #define SWITHOST		BIT(0)

 #define MAX_PHYS		2

 #define PLL_LOCK_TIME_US	100
 #define PLL_PWR_DOWN_TIME_US	5
 #define PLL_FVCO		2880	 /* in MHz */
 #define PLL_INFF_MIN_RATE	19200000 /* in Hz */
 #define PLL_INFF_MAX_RATE	38400000 /* in Hz */

 struct pll_params {
 	u8 ndiv;
 	u16 frac;
 };

 struct stm32_usbphyc {
 	fdt_addr_t base;
 	struct clk clk;
 	struct stm32_usbphyc_phy {
 		struct udevice *vdd;
 		struct udevice *vdda1v1;
 		struct udevice *vdda1v8;
 		int index;
 		bool init;
 		bool powered;
 	} phys[MAX_PHYS];
 };

 void stm32_usbphyc_get_pll_params(u32 clk_rate, struct pll_params *pll_params)
 {
 	unsigned long long fvco, ndiv, frac;

 	/*
 	 *    | FVCO = INFF*2*(NDIV + FRACT/2^16 ) when DITHER_DISABLE[1] = 1
 	 *    | FVCO = 2880MHz
 	 *    | NDIV = integer part of input bits to set the LDF
 	 *    | FRACT = fractional part of input bits to set the LDF
 	 *  =>	PLLNDIV = integer part of (FVCO / (INFF*2))
 	 *  =>	PLLFRACIN = fractional part of(FVCO / INFF*2) * 2^16
 	 * <=>  PLLFRACIN = ((FVCO / (INFF*2)) - PLLNDIV) * 2^16
 	 */
 	fvco = (unsigned long long)PLL_FVCO * 1000000; /* In Hz */

 	ndiv = fvco;
 	do_div(ndiv, (clk_rate * 2));
 	pll_params->ndiv = (u8)ndiv;

 	frac = fvco * (1 << 16);
 	do_div(frac, (clk_rate * 2));
 	frac = frac - (ndiv * (1 << 16));
 	pll_params->frac = (u16)frac;
 }

 static int stm32_usbphyc_pll_init(struct stm32_usbphyc *usbphyc)
 {
 	struct pll_params pll_params;
 	u32 clk_rate = clk_get_rate(&usbphyc->clk);
 	u32 usbphyc_pll;

 	if ((clk_rate < PLL_INFF_MIN_RATE) || (clk_rate > PLL_INFF_MAX_RATE)) {
 		pr_debug("%s: input clk freq (%dHz) out of range\n",
 			 __func__, clk_rate);
 		return -EINVAL;
 	}

 	stm32_usbphyc_get_pll_params(clk_rate, &pll_params);

 	usbphyc_pll = PLLDITHEN1 | PLLDITHEN0 | PLLSTRBYP;
 	usbphyc_pll |= ((pll_params.ndiv << PLLNDIV_SHIFT) & PLLNDIV);

 	if (pll_params.frac) {
 		usbphyc_pll |= PLLFRACCTL;
 		usbphyc_pll |= ((pll_params.frac << PLLFRACIN_SHIFT)
 				 & PLLFRACIN);
 	}

 	writel(usbphyc_pll, usbphyc->base + STM32_USBPHYC_PLL);

 	pr_debug("%s: input clk freq=%dHz, ndiv=%d, frac=%d\n", __func__,
 		 clk_rate, pll_params.ndiv, pll_params.frac);

 	return 0;
 }

 static bool stm32_usbphyc_is_init(struct stm32_usbphyc *usbphyc)
 {
 	int i;

 	for (i = 0; i < MAX_PHYS; i++) {
 		if (usbphyc->phys[i].init)
 			return true;
 	}

 	return false;
 }

 static bool stm32_usbphyc_is_powered(struct stm32_usbphyc *usbphyc)
 {
 	int i;

 	for (i = 0; i < MAX_PHYS; i++) {
 		if (usbphyc->phys[i].powered)
 			return true;
 	}

 	return false;
 }

 static int stm32_usbphyc_phy_init(struct phy *phy)
 {
 	struct stm32_usbphyc *usbphyc = dev_get_priv(phy->dev);
 	struct stm32_usbphyc_phy *usbphyc_phy = usbphyc->phys + phy->id;
 	bool pllen = readl(usbphyc->base + STM32_USBPHYC_PLL) & PLLEN ?
 		     true : false;
 	int ret;

 	pr_debug("%s phy ID = %lu\n", __func__, phy->id);
 	/* Check if one phy port has already configured the pll */
 	if (pllen && stm32_usbphyc_is_init(usbphyc))
 		goto initialized;

 	if (pllen) {
 		clrbits_le32(usbphyc->base + STM32_USBPHYC_PLL, PLLEN);
 		udelay(PLL_PWR_DOWN_TIME_US);
 	}

 	ret = stm32_usbphyc_pll_init(usbphyc);
 	if (ret)
 		return ret;

 	setbits_le32(usbphyc->base + STM32_USBPHYC_PLL, PLLEN);

 	/*
 	 * We must wait PLL_LOCK_TIME_US before checking that PLLEN
 	 * bit is still set
 	 */
 	udelay(PLL_LOCK_TIME_US);

 	if (!(readl(usbphyc->base + STM32_USBPHYC_PLL) & PLLEN))
 		return -EIO;

 initialized:
 	usbphyc_phy->init = true;

 	return 0;
 }

 static int stm32_usbphyc_phy_exit(struct phy *phy)
 {
 	struct stm32_usbphyc *usbphyc = dev_get_priv(phy->dev);
 	struct stm32_usbphyc_phy *usbphyc_phy = usbphyc->phys + phy->id;

 	pr_debug("%s phy ID = %lu\n", __func__, phy->id);
 	usbphyc_phy->init = false;

 	/* Check if other phy port requires pllen */
 	if (stm32_usbphyc_is_init(usbphyc))
 		return 0;

 	clrbits_le32(usbphyc->base + STM32_USBPHYC_PLL, PLLEN);

 	/*
 	 * We must wait PLL_PWR_DOWN_TIME_US before checking that PLLEN
 	 * bit is still clear
 	 */
 	udelay(PLL_PWR_DOWN_TIME_US);

 	if (readl(usbphyc->base + STM32_USBPHYC_PLL) & PLLEN)
 		return -EIO;

 	return 0;
 }

 static int stm32_usbphyc_phy_power_on(struct phy *phy)
 {
 	struct stm32_usbphyc *usbphyc = dev_get_priv(phy->dev);
 	struct stm32_usbphyc_phy *usbphyc_phy = usbphyc->phys + phy->id;
 	int ret;

 	pr_debug("%s phy ID = %lu\n", __func__, phy->id);
 	if (usbphyc_phy->vdda1v1) {
 		ret = regulator_set_enable(usbphyc_phy->vdda1v1, true);
 		if (ret)
 			return ret;
 	}

 	if (usbphyc_phy->vdda1v8) {
 		ret = regulator_set_enable(usbphyc_phy->vdda1v8, true);
 		if (ret)
 			return ret;
 	}
 	if (usbphyc_phy->vdd) {
 		ret = regulator_set_enable(usbphyc_phy->vdd, true);
 		if (ret)
 			return ret;
 	}

 	usbphyc_phy->powered = true;

 	return 0;
 }

 static int stm32_usbphyc_phy_power_off(struct phy *phy)
 {
 	struct stm32_usbphyc *usbphyc = dev_get_priv(phy->dev);
 	struct stm32_usbphyc_phy *usbphyc_phy = usbphyc->phys + phy->id;
 	int ret;

 	pr_debug("%s phy ID = %lu\n", __func__, phy->id);
 	usbphyc_phy->powered = false;

 	if (stm32_usbphyc_is_powered(usbphyc))
 		return 0;

 	if (usbphyc_phy->vdda1v1) {
 		ret = regulator_set_enable(usbphyc_phy->vdda1v1, false);
 		if (ret)
 			return ret;
 	}

 	if (usbphyc_phy->vdda1v8) {
 		ret = regulator_set_enable(usbphyc_phy->vdda1v8, false);
 		if (ret)
 			return ret;
 	}

 	if (usbphyc_phy->vdd) {
 		ret = regulator_set_enable(usbphyc_phy->vdd, false);
 		if (ret)
 			return ret;
 	}

 	return 0;
 }

 static int stm32_usbphyc_get_regulator(struct udevice *dev, ofnode node,
 				       char *supply_name,
 				       struct udevice **regulator)
 {
 	struct ofnode_phandle_args regulator_phandle;
 	int ret;

 	ret = ofnode_parse_phandle_with_args(node, supply_name,
 					     NULL, 0, 0,
 					     &regulator_phandle);
 	if (ret) {
 		dev_err(dev, "Can't find %s property (%d)\n", supply_name, ret);
 		return ret;
 	}

 	ret = uclass_get_device_by_ofnode(UCLASS_REGULATOR,
 					  regulator_phandle.node,
 					  regulator);

 	if (ret) {
 		dev_err(dev, "Can't get %s regulator (%d)\n", supply_name, ret);
 		return ret;
 	}

 	return 0;
 }

 static int stm32_usbphyc_of_xlate(struct phy *phy,
 				  struct ofnode_phandle_args *args)
 {
 	if (args->args_count > 1) {
 		pr_debug("%s: invalid args_count: %d\n", __func__,
 			 args->args_count);
 		return -EINVAL;
 	}

 	if (args->args[0] >= MAX_PHYS)
 		return -ENODEV;

 	if (args->args_count)
 		phy->id = args->args[0];
 	else
 		phy->id = 0;

 	return 0;
 }

 static const struct phy_ops stm32_usbphyc_phy_ops = {
 	.init = stm32_usbphyc_phy_init,
 	.exit = stm32_usbphyc_phy_exit,
 	.power_on = stm32_usbphyc_phy_power_on,
 	.power_off = stm32_usbphyc_phy_power_off,
 	.of_xlate = stm32_usbphyc_of_xlate,
 };

 static int stm32_usbphyc_probe(struct udevice *dev)
 {
 	struct stm32_usbphyc *usbphyc = dev_get_priv(dev);
 	struct reset_ctl reset;
 	ofnode node;
 	int i, ret;

 	usbphyc->base = dev_read_addr(dev);
 	if (usbphyc->base == FDT_ADDR_T_NONE)
 		return -EINVAL;

 	/* Enable clock */
 	ret = clk_get_by_index(dev, 0, &usbphyc->clk);
 	if (ret)
 		return ret;

 	ret = clk_enable(&usbphyc->clk);
 	if (ret)
 		return ret;

 	/* Reset */
 	ret = reset_get_by_index(dev, 0, &reset);
 	if (!ret) {
 		reset_assert(&reset);
 		udelay(2);
 		reset_deassert(&reset);
 	}

 	/*
 	 * parse all PHY subnodes in order to populate regulator associated
 	 * to each PHY port
 	 */
 	node = dev_read_first_subnode(dev);
 	for (i = 0; i < MAX_PHYS; i++) {
 		struct stm32_usbphyc_phy *usbphyc_phy = usbphyc->phys + i;

 		usbphyc_phy->index = i;
 		usbphyc_phy->init = false;
 		usbphyc_phy->powered = false;
 		ret = stm32_usbphyc_get_regulator(dev, node, "phy-supply",
 						  &usbphyc_phy->vdd);
 		if (ret)
 			return ret;

 		ret = stm32_usbphyc_get_regulator(dev, node, "vdda1v1-supply",
 						  &usbphyc_phy->vdda1v1);
 		if (ret)
 			return ret;

 		ret = stm32_usbphyc_get_regulator(dev, node, "vdda1v8-supply",
 						  &usbphyc_phy->vdda1v8);
 		if (ret)
 			return ret;

 		node = dev_read_next_subnode(node);
 	}

 	/* Check if second port has to be used for host controller */
 	if (dev_read_bool(dev, "st,port2-switch-to-host"))
 		setbits_le32(usbphyc->base + STM32_USBPHYC_MISC, SWITHOST);

 	return 0;
 }

 static const struct udevice_id stm32_usbphyc_of_match[] = {
 	{ .compatible = "st,stm32mp1-usbphyc", },
 	{ },
 };

 U_BOOT_DRIVER(stm32_usb_phyc) = {
 	.name = "stm32-usbphyc",
 	.id = UCLASS_PHY,
 	.of_match = stm32_usbphyc_of_match,
 	.ops = &stm32_usbphyc_phy_ops,
 	.probe = stm32_usbphyc_probe,
 	.priv_auto_alloc_size = sizeof(struct stm32_usbphyc),
 };
	// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
	/*
	* Copyright (C) 2018, STMicroelectronics - All Rights Reserved
	*/

	#include <common.h>
	#include <clk.h>
	#include <div64.h>
	#include <dm.h>
	#include <fdtdec.h>
	#include <generic-phy.h>
	#include <reset.h>
	#include <syscon.h>
	#include <usb.h>
	#include <asm/io.h>
	#include <linux/bitops.h>
	#include <power/regulator.h>

	/* USBPHYC registers */
	#define STM32_USBPHYC_PLL 0x0
	#define STM32_USBPHYC_MISC 0x8

	/* STM32_USBPHYC_PLL bit fields */
	#define PLLNDIV GENMASK(6, 0)
	#define PLLNDIV_SHIFT 0
	#define PLLFRACIN GENMASK(25, 10)
	#define PLLFRACIN_SHIFT 10
	#define PLLEN BIT(26)
	#define PLLSTRB BIT(27)
	#define PLLSTRBYP BIT(28)
	#define PLLFRACCTL BIT(29)
	#define PLLDITHEN0 BIT(30)
	#define PLLDITHEN1 BIT(31)

	/* STM32_USBPHYC_MISC bit fields */
	#define SWITHOST BIT(0)

	#define MAX_PHYS 2

	#define PLL_LOCK_TIME_US 100
	#define PLL_PWR_DOWN_TIME_US 5
	#define PLL_FVCO 2880 /* in MHz */
	#define PLL_INFF_MIN_RATE 19200000 /* in Hz */
	#define PLL_INFF_MAX_RATE 38400000 /* in Hz */

	struct pll_params {
	u8 ndiv;
	u16 frac;
	};

	struct stm32_usbphyc {
	fdt_addr_t base;
	struct clk clk;
	struct stm32_usbphyc_phy {
	struct udevice *vdd;
	struct udevice *vdda1v1;
	struct udevice *vdda1v8;
	int index;
	bool init;
	bool powered;
	} phys[MAX_PHYS];
	};

	void stm32_usbphyc_get_pll_params(u32 clk_rate, struct pll_params *pll_params)
	{
	unsigned long long fvco, ndiv, frac;

	/*
	* \| FVCO = INFF2(NDIV + FRACT/2^16 ) when DITHER_DISABLE[1] = 1
	* \| FVCO = 2880MHz
	* \| NDIV = integer part of input bits to set the LDF
	* \| FRACT = fractional part of input bits to set the LDF
	* => PLLNDIV = integer part of (FVCO / (INFF*2))
	* => PLLFRACIN = fractional part of(FVCO / INFF2) 2^16
	* <=> PLLFRACIN = ((FVCO / (INFF2)) - PLLNDIV) 2^16
	*/
	fvco = (unsigned long long)PLL_FVCO * 1000000; /* In Hz */

	ndiv = fvco;
	do_div(ndiv, (clk_rate * 2));
	pll_params->ndiv = (u8)ndiv;

	frac = fvco * (1 << 16);
	do_div(frac, (clk_rate * 2));
	frac = frac - (ndiv * (1 << 16));
	pll_params->frac = (u16)frac;
	}

	static int stm32_usbphyc_pll_init(struct stm32_usbphyc *usbphyc)
	{
	struct pll_params pll_params;
	u32 clk_rate = clk_get_rate(&usbphyc->clk);
	u32 usbphyc_pll;

	if ((clk_rate < PLL_INFF_MIN_RATE) \|\| (clk_rate > PLL_INFF_MAX_RATE)) {
	pr_debug("%s: input clk freq (%dHz) out of range\n",
	__func__, clk_rate);
	return -EINVAL;
	}

	stm32_usbphyc_get_pll_params(clk_rate, &pll_params);

	usbphyc_pll = PLLDITHEN1 \| PLLDITHEN0 \| PLLSTRBYP;
	usbphyc_pll \|= ((pll_params.ndiv << PLLNDIV_SHIFT) & PLLNDIV);

	if (pll_params.frac) {
	usbphyc_pll \|= PLLFRACCTL;
	usbphyc_pll \|= ((pll_params.frac << PLLFRACIN_SHIFT)
	& PLLFRACIN);
	}

	writel(usbphyc_pll, usbphyc->base + STM32_USBPHYC_PLL);

	pr_debug("%s: input clk freq=%dHz, ndiv=%d, frac=%d\n", __func__,
	clk_rate, pll_params.ndiv, pll_params.frac);

	return 0;
	}

	static bool stm32_usbphyc_is_init(struct stm32_usbphyc *usbphyc)
	{
	int i;

	for (i = 0; i < MAX_PHYS; i++) {
	if (usbphyc->phys[i].init)
	return true;
	}

	return false;
	}

	static bool stm32_usbphyc_is_powered(struct stm32_usbphyc *usbphyc)
	{
	int i;

	for (i = 0; i < MAX_PHYS; i++) {
	if (usbphyc->phys[i].powered)
	return true;
	}

	return false;
	}

	static int stm32_usbphyc_phy_init(struct phy *phy)
	{
	struct stm32_usbphyc *usbphyc = dev_get_priv(phy->dev);
	struct stm32_usbphyc_phy *usbphyc_phy = usbphyc->phys + phy->id;
	bool pllen = readl(usbphyc->base + STM32_USBPHYC_PLL) & PLLEN ?
	true : false;
	int ret;

	pr_debug("%s phy ID = %lu\n", __func__, phy->id);
	/* Check if one phy port has already configured the pll */
	if (pllen && stm32_usbphyc_is_init(usbphyc))
	goto initialized;

	if (pllen) {
	clrbits_le32(usbphyc->base + STM32_USBPHYC_PLL, PLLEN);
	udelay(PLL_PWR_DOWN_TIME_US);
	}

	ret = stm32_usbphyc_pll_init(usbphyc);
	if (ret)
	return ret;

	setbits_le32(usbphyc->base + STM32_USBPHYC_PLL, PLLEN);

	/*
	* We must wait PLL_LOCK_TIME_US before checking that PLLEN
	* bit is still set
	*/
	udelay(PLL_LOCK_TIME_US);

	if (!(readl(usbphyc->base + STM32_USBPHYC_PLL) & PLLEN))
	return -EIO;

	initialized:
	usbphyc_phy->init = true;

	return 0;
	}

	static int stm32_usbphyc_phy_exit(struct phy *phy)
	{
	struct stm32_usbphyc *usbphyc = dev_get_priv(phy->dev);
	struct stm32_usbphyc_phy *usbphyc_phy = usbphyc->phys + phy->id;

	pr_debug("%s phy ID = %lu\n", __func__, phy->id);
	usbphyc_phy->init = false;

	/* Check if other phy port requires pllen */
	if (stm32_usbphyc_is_init(usbphyc))
	return 0;

	clrbits_le32(usbphyc->base + STM32_USBPHYC_PLL, PLLEN);

	/*
	* We must wait PLL_PWR_DOWN_TIME_US before checking that PLLEN
	* bit is still clear
	*/
	udelay(PLL_PWR_DOWN_TIME_US);

	if (readl(usbphyc->base + STM32_USBPHYC_PLL) & PLLEN)
	return -EIO;

	return 0;
	}

	static int stm32_usbphyc_phy_power_on(struct phy *phy)
	{
	struct stm32_usbphyc *usbphyc = dev_get_priv(phy->dev);
	struct stm32_usbphyc_phy *usbphyc_phy = usbphyc->phys + phy->id;
	int ret;

	pr_debug("%s phy ID = %lu\n", __func__, phy->id);
	if (usbphyc_phy->vdda1v1) {
	ret = regulator_set_enable(usbphyc_phy->vdda1v1, true);
	if (ret)
	return ret;
	}

	if (usbphyc_phy->vdda1v8) {
	ret = regulator_set_enable(usbphyc_phy->vdda1v8, true);
	if (ret)
	return ret;
	}
	if (usbphyc_phy->vdd) {
	ret = regulator_set_enable(usbphyc_phy->vdd, true);
	if (ret)
	return ret;
	}

	usbphyc_phy->powered = true;

	return 0;
	}

	static int stm32_usbphyc_phy_power_off(struct phy *phy)
	{
	struct stm32_usbphyc *usbphyc = dev_get_priv(phy->dev);
	struct stm32_usbphyc_phy *usbphyc_phy = usbphyc->phys + phy->id;
	int ret;

	pr_debug("%s phy ID = %lu\n", __func__, phy->id);
	usbphyc_phy->powered = false;

	if (stm32_usbphyc_is_powered(usbphyc))
	return 0;

	if (usbphyc_phy->vdda1v1) {
	ret = regulator_set_enable(usbphyc_phy->vdda1v1, false);
	if (ret)
	return ret;
	}

	if (usbphyc_phy->vdda1v8) {
	ret = regulator_set_enable(usbphyc_phy->vdda1v8, false);
	if (ret)
	return ret;
	}

	if (usbphyc_phy->vdd) {
	ret = regulator_set_enable(usbphyc_phy->vdd, false);
	if (ret)
	return ret;
	}

	return 0;
	}

	static int stm32_usbphyc_get_regulator(struct udevice *dev, ofnode node,
	char *supply_name,
	struct udevice **regulator)
	{
	struct ofnode_phandle_args regulator_phandle;
	int ret;

	ret = ofnode_parse_phandle_with_args(node, supply_name,
	NULL, 0, 0,
	&regulator_phandle);
	if (ret) {
	dev_err(dev, "Can't find %s property (%d)\n", supply_name, ret);
	return ret;
	}

	ret = uclass_get_device_by_ofnode(UCLASS_REGULATOR,
	regulator_phandle.node,
	regulator);

	if (ret) {
	dev_err(dev, "Can't get %s regulator (%d)\n", supply_name, ret);
	return ret;
	}

	return 0;
	}

	static int stm32_usbphyc_of_xlate(struct phy *phy,
	struct ofnode_phandle_args *args)
	{
	if (args->args_count > 1) {
	pr_debug("%s: invalid args_count: %d\n", __func__,
	args->args_count);
	return -EINVAL;
	}

	if (args->args[0] >= MAX_PHYS)
	return -ENODEV;

	if (args->args_count)
	phy->id = args->args[0];
	else
	phy->id = 0;

	return 0;
	}

	static const struct phy_ops stm32_usbphyc_phy_ops = {
	.init = stm32_usbphyc_phy_init,
	.exit = stm32_usbphyc_phy_exit,
	.power_on = stm32_usbphyc_phy_power_on,
	.power_off = stm32_usbphyc_phy_power_off,
	.of_xlate = stm32_usbphyc_of_xlate,
	};

	static int stm32_usbphyc_probe(struct udevice *dev)
	{
	struct stm32_usbphyc *usbphyc = dev_get_priv(dev);
	struct reset_ctl reset;
	ofnode node;
	int i, ret;

	usbphyc->base = dev_read_addr(dev);
	if (usbphyc->base == FDT_ADDR_T_NONE)
	return -EINVAL;

	/* Enable clock */
	ret = clk_get_by_index(dev, 0, &usbphyc->clk);
	if (ret)
	return ret;

	ret = clk_enable(&usbphyc->clk);
	if (ret)
	return ret;

	/* Reset */
	ret = reset_get_by_index(dev, 0, &reset);
	if (!ret) {
	reset_assert(&reset);
	udelay(2);
	reset_deassert(&reset);
	}

	/*
	* parse all PHY subnodes in order to populate regulator associated
	* to each PHY port
	*/
	node = dev_read_first_subnode(dev);
	for (i = 0; i < MAX_PHYS; i++) {
	struct stm32_usbphyc_phy *usbphyc_phy = usbphyc->phys + i;

	usbphyc_phy->index = i;
	usbphyc_phy->init = false;
	usbphyc_phy->powered = false;
	ret = stm32_usbphyc_get_regulator(dev, node, "phy-supply",
	&usbphyc_phy->vdd);
	if (ret)
	return ret;

	ret = stm32_usbphyc_get_regulator(dev, node, "vdda1v1-supply",
	&usbphyc_phy->vdda1v1);
	if (ret)
	return ret;

	ret = stm32_usbphyc_get_regulator(dev, node, "vdda1v8-supply",
	&usbphyc_phy->vdda1v8);
	if (ret)
	return ret;

	node = dev_read_next_subnode(node);
	}

	/* Check if second port has to be used for host controller */
	if (dev_read_bool(dev, "st,port2-switch-to-host"))
	setbits_le32(usbphyc->base + STM32_USBPHYC_MISC, SWITHOST);

	return 0;
	}

	static const struct udevice_id stm32_usbphyc_of_match[] = {
	{ .compatible = "st,stm32mp1-usbphyc", },
	{ },
	};

	U_BOOT_DRIVER(stm32_usb_phyc) = {
	.name = "stm32-usbphyc",
	.id = UCLASS_PHY,
	.of_match = stm32_usbphyc_of_match,
	.ops = &stm32_usbphyc_phy_ops,
	.probe = stm32_usbphyc_probe,
	.priv_auto_alloc_size = sizeof(struct stm32_usbphyc),
	};