drivers/phy/phy-qcom-apq8064-sata.c - arm/linux - Git at Google

 /*
  * Copyright (c) 2014, The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
  * only version 2 as published by the Free Software Foundation.
  *
  * 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/io.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/time.h>
 #include <linux/delay.h>
 #include <linux/clk.h>
 #include <linux/slab.h>
 #include <linux/platform_device.h>
 #include <linux/phy/phy.h>

 /* PHY registers */
 #define UNIPHY_PLL_REFCLK_CFG		0x000
 #define UNIPHY_PLL_PWRGEN_CFG		0x014
 #define UNIPHY_PLL_GLB_CFG		0x020
 #define UNIPHY_PLL_SDM_CFG0		0x038
 #define UNIPHY_PLL_SDM_CFG1		0x03C
 #define UNIPHY_PLL_SDM_CFG2		0x040
 #define UNIPHY_PLL_SDM_CFG3		0x044
 #define UNIPHY_PLL_SDM_CFG4		0x048
 #define UNIPHY_PLL_SSC_CFG0		0x04C
 #define UNIPHY_PLL_SSC_CFG1		0x050
 #define UNIPHY_PLL_SSC_CFG2		0x054
 #define UNIPHY_PLL_SSC_CFG3		0x058
 #define UNIPHY_PLL_LKDET_CFG0		0x05C
 #define UNIPHY_PLL_LKDET_CFG1		0x060
 #define UNIPHY_PLL_LKDET_CFG2		0x064
 #define UNIPHY_PLL_CAL_CFG0		0x06C
 #define UNIPHY_PLL_CAL_CFG8		0x08C
 #define UNIPHY_PLL_CAL_CFG9		0x090
 #define UNIPHY_PLL_CAL_CFG10		0x094
 #define UNIPHY_PLL_CAL_CFG11		0x098
 #define UNIPHY_PLL_STATUS		0x0C0

 #define SATA_PHY_SER_CTRL		0x100
 #define SATA_PHY_TX_DRIV_CTRL0		0x104
 #define SATA_PHY_TX_DRIV_CTRL1		0x108
 #define SATA_PHY_TX_IMCAL0		0x11C
 #define SATA_PHY_TX_IMCAL2		0x124
 #define SATA_PHY_RX_IMCAL0		0x128
 #define SATA_PHY_EQUAL			0x13C
 #define SATA_PHY_OOB_TERM		0x144
 #define SATA_PHY_CDR_CTRL0		0x148
 #define SATA_PHY_CDR_CTRL1		0x14C
 #define SATA_PHY_CDR_CTRL2		0x150
 #define SATA_PHY_CDR_CTRL3		0x154
 #define SATA_PHY_PI_CTRL0		0x168
 #define SATA_PHY_POW_DWN_CTRL0		0x180
 #define SATA_PHY_POW_DWN_CTRL1		0x184
 #define SATA_PHY_TX_DATA_CTRL		0x188
 #define SATA_PHY_ALIGNP			0x1A4
 #define SATA_PHY_TX_IMCAL_STAT		0x1E4
 #define SATA_PHY_RX_IMCAL_STAT		0x1E8

 #define UNIPHY_PLL_LOCK		BIT(0)
 #define SATA_PHY_TX_CAL		BIT(0)
 #define SATA_PHY_RX_CAL		BIT(0)

 /* default timeout set to 1 sec */
 #define TIMEOUT_MS		10000
 #define DELAY_INTERVAL_US	100

 struct qcom_apq8064_sata_phy {
 	void __iomem *mmio;
 	struct clk *cfg_clk;
 	struct device *dev;
 };

 /* Helper function to do poll and timeout */
 static int read_poll_timeout(void __iomem *addr, u32 mask)
 {
 	unsigned long timeout = jiffies + msecs_to_jiffies(TIMEOUT_MS);

 	do {
 		if (readl_relaxed(addr) & mask)
 			return 0;

 		 usleep_range(DELAY_INTERVAL_US, DELAY_INTERVAL_US + 50);
 	} while (!time_after(jiffies, timeout));

 	return -ETIMEDOUT;
 }

 static int qcom_apq8064_sata_phy_init(struct phy *generic_phy)
 {
 	struct qcom_apq8064_sata_phy *phy = phy_get_drvdata(generic_phy);
 	void __iomem *base = phy->mmio;
 	int ret = 0;

 	/* SATA phy initialization */
 	writel_relaxed(0x01, base + SATA_PHY_SER_CTRL);
 	writel_relaxed(0xB1, base + SATA_PHY_POW_DWN_CTRL0);
 	/* Make sure the power down happens before power up */
 	mb();
 	usleep_range(10, 60);

 	writel_relaxed(0x01, base + SATA_PHY_POW_DWN_CTRL0);
 	writel_relaxed(0x3E, base + SATA_PHY_POW_DWN_CTRL1);
 	writel_relaxed(0x01, base + SATA_PHY_RX_IMCAL0);
 	writel_relaxed(0x01, base + SATA_PHY_TX_IMCAL0);
 	writel_relaxed(0x02, base + SATA_PHY_TX_IMCAL2);

 	/* Write UNIPHYPLL registers to configure PLL */
 	writel_relaxed(0x04, base + UNIPHY_PLL_REFCLK_CFG);
 	writel_relaxed(0x00, base + UNIPHY_PLL_PWRGEN_CFG);

 	writel_relaxed(0x0A, base + UNIPHY_PLL_CAL_CFG0);
 	writel_relaxed(0xF3, base + UNIPHY_PLL_CAL_CFG8);
 	writel_relaxed(0x01, base + UNIPHY_PLL_CAL_CFG9);
 	writel_relaxed(0xED, base + UNIPHY_PLL_CAL_CFG10);
 	writel_relaxed(0x02, base + UNIPHY_PLL_CAL_CFG11);

 	writel_relaxed(0x36, base + UNIPHY_PLL_SDM_CFG0);
 	writel_relaxed(0x0D, base + UNIPHY_PLL_SDM_CFG1);
 	writel_relaxed(0xA3, base + UNIPHY_PLL_SDM_CFG2);
 	writel_relaxed(0xF0, base + UNIPHY_PLL_SDM_CFG3);
 	writel_relaxed(0x00, base + UNIPHY_PLL_SDM_CFG4);

 	writel_relaxed(0x19, base + UNIPHY_PLL_SSC_CFG0);
 	writel_relaxed(0xE1, base + UNIPHY_PLL_SSC_CFG1);
 	writel_relaxed(0x00, base + UNIPHY_PLL_SSC_CFG2);
 	writel_relaxed(0x11, base + UNIPHY_PLL_SSC_CFG3);

 	writel_relaxed(0x04, base + UNIPHY_PLL_LKDET_CFG0);
 	writel_relaxed(0xFF, base + UNIPHY_PLL_LKDET_CFG1);

 	writel_relaxed(0x02, base + UNIPHY_PLL_GLB_CFG);
 	/* make sure global config LDO power down happens before power up */
 	mb();

 	writel_relaxed(0x03, base + UNIPHY_PLL_GLB_CFG);
 	writel_relaxed(0x05, base + UNIPHY_PLL_LKDET_CFG2);

 	/* PLL Lock wait */
 	ret = read_poll_timeout(base + UNIPHY_PLL_STATUS, UNIPHY_PLL_LOCK);
 	if (ret) {
 		dev_err(phy->dev, "poll timeout UNIPHY_PLL_STATUS\n");
 		return ret;
 	}

 	/* TX Calibration */
 	ret = read_poll_timeout(base + SATA_PHY_TX_IMCAL_STAT, SATA_PHY_TX_CAL);
 	if (ret) {
 		dev_err(phy->dev, "poll timeout SATA_PHY_TX_IMCAL_STAT\n");
 		return ret;
 	}

 	/* RX Calibration */
 	ret = read_poll_timeout(base + SATA_PHY_RX_IMCAL_STAT, SATA_PHY_RX_CAL);
 	if (ret) {
 		dev_err(phy->dev, "poll timeout SATA_PHY_RX_IMCAL_STAT\n");
 		return ret;
 	}

 	/* SATA phy calibrated succesfully, power up to functional mode */
 	writel_relaxed(0x3E, base + SATA_PHY_POW_DWN_CTRL1);
 	writel_relaxed(0x01, base + SATA_PHY_RX_IMCAL0);
 	writel_relaxed(0x01, base + SATA_PHY_TX_IMCAL0);

 	writel_relaxed(0x00, base + SATA_PHY_POW_DWN_CTRL1);
 	writel_relaxed(0x59, base + SATA_PHY_CDR_CTRL0);
 	writel_relaxed(0x04, base + SATA_PHY_CDR_CTRL1);
 	writel_relaxed(0x00, base + SATA_PHY_CDR_CTRL2);
 	writel_relaxed(0x00, base + SATA_PHY_PI_CTRL0);
 	writel_relaxed(0x00, base + SATA_PHY_CDR_CTRL3);
 	writel_relaxed(0x01, base + SATA_PHY_POW_DWN_CTRL0);

 	writel_relaxed(0x11, base + SATA_PHY_TX_DATA_CTRL);
 	writel_relaxed(0x43, base + SATA_PHY_ALIGNP);
 	writel_relaxed(0x04, base + SATA_PHY_OOB_TERM);

 	writel_relaxed(0x01, base + SATA_PHY_EQUAL);
 	writel_relaxed(0x09, base + SATA_PHY_TX_DRIV_CTRL0);
 	writel_relaxed(0x09, base + SATA_PHY_TX_DRIV_CTRL1);

 	return 0;
 }

 static int qcom_apq8064_sata_phy_exit(struct phy *generic_phy)
 {
 	struct qcom_apq8064_sata_phy *phy = phy_get_drvdata(generic_phy);
 	void __iomem *base = phy->mmio;

 	/* Power down PHY */
 	writel_relaxed(0xF8, base + SATA_PHY_POW_DWN_CTRL0);
 	writel_relaxed(0xFE, base + SATA_PHY_POW_DWN_CTRL1);

 	/* Power down PLL block */
 	writel_relaxed(0x00, base + UNIPHY_PLL_GLB_CFG);

 	return 0;
 }

 static struct phy_ops qcom_apq8064_sata_phy_ops = {
 	.init		= qcom_apq8064_sata_phy_init,
 	.exit		= qcom_apq8064_sata_phy_exit,
 	.owner		= THIS_MODULE,
 };

 static int qcom_apq8064_sata_phy_probe(struct platform_device *pdev)
 {
 	struct qcom_apq8064_sata_phy *phy;
 	struct device *dev = &pdev->dev;
 	struct resource *res;
 	struct phy_provider *phy_provider;
 	struct phy *generic_phy;
 	int ret;

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

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	phy->mmio = devm_ioremap_resource(dev, res);
 	if (IS_ERR(phy->mmio))
 		return PTR_ERR(phy->mmio);

 	generic_phy = devm_phy_create(dev, NULL, &qcom_apq8064_sata_phy_ops,
 				      NULL);
 	if (IS_ERR(generic_phy)) {
 		dev_err(dev, "%s: failed to create phy\n", __func__);
 		return PTR_ERR(generic_phy);
 	}

 	phy->dev = dev;
 	phy_set_drvdata(generic_phy, phy);
 	platform_set_drvdata(pdev, phy);

 	phy->cfg_clk = devm_clk_get(dev, "cfg");
 	if (IS_ERR(phy->cfg_clk)) {
 		dev_err(dev, "Failed to get sata cfg clock\n");
 		return PTR_ERR(phy->cfg_clk);
 	}

 	ret = clk_prepare_enable(phy->cfg_clk);
 	if (ret)
 		return ret;

 	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
 	if (IS_ERR(phy_provider)) {
 		clk_disable_unprepare(phy->cfg_clk);
 		dev_err(dev, "%s: failed to register phy\n", __func__);
 		return PTR_ERR(phy_provider);
 	}

 	return 0;
 }

 static int qcom_apq8064_sata_phy_remove(struct platform_device *pdev)
 {
 	struct qcom_apq8064_sata_phy *phy = platform_get_drvdata(pdev);

 	clk_disable_unprepare(phy->cfg_clk);

 	return 0;
 }

 static const struct of_device_id qcom_apq8064_sata_phy_of_match[] = {
 	{ .compatible = "qcom,apq8064-sata-phy" },
 	{ },
 };
 MODULE_DEVICE_TABLE(of, qcom_apq8064_sata_phy_of_match);

 static struct platform_driver qcom_apq8064_sata_phy_driver = {
 	.probe	= qcom_apq8064_sata_phy_probe,
 	.remove	= qcom_apq8064_sata_phy_remove,
 	.driver = {
 		.name	= "qcom-apq8064-sata-phy",
 		.owner	= THIS_MODULE,
 		.of_match_table	= qcom_apq8064_sata_phy_of_match,
 	}
 };
 module_platform_driver(qcom_apq8064_sata_phy_driver);

 MODULE_DESCRIPTION("QCOM apq8064 SATA PHY driver");
 MODULE_LICENSE("GPL v2");
	/*
	* Copyright (c) 2014, The Linux Foundation. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 and
	* only version 2 as published by the Free Software Foundation.
	*
	* 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/io.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/time.h>
	#include <linux/delay.h>
	#include <linux/clk.h>
	#include <linux/slab.h>
	#include <linux/platform_device.h>
	#include <linux/phy/phy.h>

	/* PHY registers */
	#define UNIPHY_PLL_REFCLK_CFG 0x000
	#define UNIPHY_PLL_PWRGEN_CFG 0x014
	#define UNIPHY_PLL_GLB_CFG 0x020
	#define UNIPHY_PLL_SDM_CFG0 0x038
	#define UNIPHY_PLL_SDM_CFG1 0x03C
	#define UNIPHY_PLL_SDM_CFG2 0x040
	#define UNIPHY_PLL_SDM_CFG3 0x044
	#define UNIPHY_PLL_SDM_CFG4 0x048
	#define UNIPHY_PLL_SSC_CFG0 0x04C
	#define UNIPHY_PLL_SSC_CFG1 0x050
	#define UNIPHY_PLL_SSC_CFG2 0x054
	#define UNIPHY_PLL_SSC_CFG3 0x058
	#define UNIPHY_PLL_LKDET_CFG0 0x05C
	#define UNIPHY_PLL_LKDET_CFG1 0x060
	#define UNIPHY_PLL_LKDET_CFG2 0x064
	#define UNIPHY_PLL_CAL_CFG0 0x06C
	#define UNIPHY_PLL_CAL_CFG8 0x08C
	#define UNIPHY_PLL_CAL_CFG9 0x090
	#define UNIPHY_PLL_CAL_CFG10 0x094
	#define UNIPHY_PLL_CAL_CFG11 0x098
	#define UNIPHY_PLL_STATUS 0x0C0

	#define SATA_PHY_SER_CTRL 0x100
	#define SATA_PHY_TX_DRIV_CTRL0 0x104
	#define SATA_PHY_TX_DRIV_CTRL1 0x108
	#define SATA_PHY_TX_IMCAL0 0x11C
	#define SATA_PHY_TX_IMCAL2 0x124
	#define SATA_PHY_RX_IMCAL0 0x128
	#define SATA_PHY_EQUAL 0x13C
	#define SATA_PHY_OOB_TERM 0x144
	#define SATA_PHY_CDR_CTRL0 0x148
	#define SATA_PHY_CDR_CTRL1 0x14C
	#define SATA_PHY_CDR_CTRL2 0x150
	#define SATA_PHY_CDR_CTRL3 0x154
	#define SATA_PHY_PI_CTRL0 0x168
	#define SATA_PHY_POW_DWN_CTRL0 0x180
	#define SATA_PHY_POW_DWN_CTRL1 0x184
	#define SATA_PHY_TX_DATA_CTRL 0x188
	#define SATA_PHY_ALIGNP 0x1A4
	#define SATA_PHY_TX_IMCAL_STAT 0x1E4
	#define SATA_PHY_RX_IMCAL_STAT 0x1E8

	#define UNIPHY_PLL_LOCK BIT(0)
	#define SATA_PHY_TX_CAL BIT(0)
	#define SATA_PHY_RX_CAL BIT(0)

	/* default timeout set to 1 sec */
	#define TIMEOUT_MS 10000
	#define DELAY_INTERVAL_US 100

	struct qcom_apq8064_sata_phy {
	void __iomem *mmio;
	struct clk *cfg_clk;
	struct device *dev;
	};

	/* Helper function to do poll and timeout */
	static int read_poll_timeout(void __iomem *addr, u32 mask)
	{
	unsigned long timeout = jiffies + msecs_to_jiffies(TIMEOUT_MS);

	do {
	if (readl_relaxed(addr) & mask)
	return 0;

	usleep_range(DELAY_INTERVAL_US, DELAY_INTERVAL_US + 50);
	} while (!time_after(jiffies, timeout));

	return -ETIMEDOUT;
	}

	static int qcom_apq8064_sata_phy_init(struct phy *generic_phy)
	{
	struct qcom_apq8064_sata_phy *phy = phy_get_drvdata(generic_phy);
	void __iomem *base = phy->mmio;
	int ret = 0;

	/* SATA phy initialization */
	writel_relaxed(0x01, base + SATA_PHY_SER_CTRL);
	writel_relaxed(0xB1, base + SATA_PHY_POW_DWN_CTRL0);
	/* Make sure the power down happens before power up */
	mb();
	usleep_range(10, 60);

	writel_relaxed(0x01, base + SATA_PHY_POW_DWN_CTRL0);
	writel_relaxed(0x3E, base + SATA_PHY_POW_DWN_CTRL1);
	writel_relaxed(0x01, base + SATA_PHY_RX_IMCAL0);
	writel_relaxed(0x01, base + SATA_PHY_TX_IMCAL0);
	writel_relaxed(0x02, base + SATA_PHY_TX_IMCAL2);

	/* Write UNIPHYPLL registers to configure PLL */
	writel_relaxed(0x04, base + UNIPHY_PLL_REFCLK_CFG);
	writel_relaxed(0x00, base + UNIPHY_PLL_PWRGEN_CFG);

	writel_relaxed(0x0A, base + UNIPHY_PLL_CAL_CFG0);
	writel_relaxed(0xF3, base + UNIPHY_PLL_CAL_CFG8);
	writel_relaxed(0x01, base + UNIPHY_PLL_CAL_CFG9);
	writel_relaxed(0xED, base + UNIPHY_PLL_CAL_CFG10);
	writel_relaxed(0x02, base + UNIPHY_PLL_CAL_CFG11);

	writel_relaxed(0x36, base + UNIPHY_PLL_SDM_CFG0);
	writel_relaxed(0x0D, base + UNIPHY_PLL_SDM_CFG1);
	writel_relaxed(0xA3, base + UNIPHY_PLL_SDM_CFG2);
	writel_relaxed(0xF0, base + UNIPHY_PLL_SDM_CFG3);
	writel_relaxed(0x00, base + UNIPHY_PLL_SDM_CFG4);

	writel_relaxed(0x19, base + UNIPHY_PLL_SSC_CFG0);
	writel_relaxed(0xE1, base + UNIPHY_PLL_SSC_CFG1);
	writel_relaxed(0x00, base + UNIPHY_PLL_SSC_CFG2);
	writel_relaxed(0x11, base + UNIPHY_PLL_SSC_CFG3);

	writel_relaxed(0x04, base + UNIPHY_PLL_LKDET_CFG0);
	writel_relaxed(0xFF, base + UNIPHY_PLL_LKDET_CFG1);

	writel_relaxed(0x02, base + UNIPHY_PLL_GLB_CFG);
	/* make sure global config LDO power down happens before power up */
	mb();

	writel_relaxed(0x03, base + UNIPHY_PLL_GLB_CFG);
	writel_relaxed(0x05, base + UNIPHY_PLL_LKDET_CFG2);

	/* PLL Lock wait */
	ret = read_poll_timeout(base + UNIPHY_PLL_STATUS, UNIPHY_PLL_LOCK);
	if (ret) {
	dev_err(phy->dev, "poll timeout UNIPHY_PLL_STATUS\n");
	return ret;
	}

	/* TX Calibration */
	ret = read_poll_timeout(base + SATA_PHY_TX_IMCAL_STAT, SATA_PHY_TX_CAL);
	if (ret) {
	dev_err(phy->dev, "poll timeout SATA_PHY_TX_IMCAL_STAT\n");
	return ret;
	}

	/* RX Calibration */
	ret = read_poll_timeout(base + SATA_PHY_RX_IMCAL_STAT, SATA_PHY_RX_CAL);
	if (ret) {
	dev_err(phy->dev, "poll timeout SATA_PHY_RX_IMCAL_STAT\n");
	return ret;
	}

	/* SATA phy calibrated succesfully, power up to functional mode */
	writel_relaxed(0x3E, base + SATA_PHY_POW_DWN_CTRL1);
	writel_relaxed(0x01, base + SATA_PHY_RX_IMCAL0);
	writel_relaxed(0x01, base + SATA_PHY_TX_IMCAL0);

	writel_relaxed(0x00, base + SATA_PHY_POW_DWN_CTRL1);
	writel_relaxed(0x59, base + SATA_PHY_CDR_CTRL0);
	writel_relaxed(0x04, base + SATA_PHY_CDR_CTRL1);
	writel_relaxed(0x00, base + SATA_PHY_CDR_CTRL2);
	writel_relaxed(0x00, base + SATA_PHY_PI_CTRL0);
	writel_relaxed(0x00, base + SATA_PHY_CDR_CTRL3);
	writel_relaxed(0x01, base + SATA_PHY_POW_DWN_CTRL0);

	writel_relaxed(0x11, base + SATA_PHY_TX_DATA_CTRL);
	writel_relaxed(0x43, base + SATA_PHY_ALIGNP);
	writel_relaxed(0x04, base + SATA_PHY_OOB_TERM);

	writel_relaxed(0x01, base + SATA_PHY_EQUAL);
	writel_relaxed(0x09, base + SATA_PHY_TX_DRIV_CTRL0);
	writel_relaxed(0x09, base + SATA_PHY_TX_DRIV_CTRL1);

	return 0;
	}

	static int qcom_apq8064_sata_phy_exit(struct phy *generic_phy)
	{
	struct qcom_apq8064_sata_phy *phy = phy_get_drvdata(generic_phy);
	void __iomem *base = phy->mmio;

	/* Power down PHY */
	writel_relaxed(0xF8, base + SATA_PHY_POW_DWN_CTRL0);
	writel_relaxed(0xFE, base + SATA_PHY_POW_DWN_CTRL1);

	/* Power down PLL block */
	writel_relaxed(0x00, base + UNIPHY_PLL_GLB_CFG);

	return 0;
	}

	static struct phy_ops qcom_apq8064_sata_phy_ops = {
	.init = qcom_apq8064_sata_phy_init,
	.exit = qcom_apq8064_sata_phy_exit,
	.owner = THIS_MODULE,
	};

	static int qcom_apq8064_sata_phy_probe(struct platform_device *pdev)
	{
	struct qcom_apq8064_sata_phy *phy;
	struct device *dev = &pdev->dev;
	struct resource *res;
	struct phy_provider *phy_provider;
	struct phy *generic_phy;
	int ret;

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

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	phy->mmio = devm_ioremap_resource(dev, res);
	if (IS_ERR(phy->mmio))
	return PTR_ERR(phy->mmio);

	generic_phy = devm_phy_create(dev, NULL, &qcom_apq8064_sata_phy_ops,
	NULL);
	if (IS_ERR(generic_phy)) {
	dev_err(dev, "%s: failed to create phy\n", __func__);
	return PTR_ERR(generic_phy);
	}

	phy->dev = dev;
	phy_set_drvdata(generic_phy, phy);
	platform_set_drvdata(pdev, phy);

	phy->cfg_clk = devm_clk_get(dev, "cfg");
	if (IS_ERR(phy->cfg_clk)) {
	dev_err(dev, "Failed to get sata cfg clock\n");
	return PTR_ERR(phy->cfg_clk);
	}

	ret = clk_prepare_enable(phy->cfg_clk);
	if (ret)
	return ret;

	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
	if (IS_ERR(phy_provider)) {
	clk_disable_unprepare(phy->cfg_clk);
	dev_err(dev, "%s: failed to register phy\n", __func__);
	return PTR_ERR(phy_provider);
	}

	return 0;
	}

	static int qcom_apq8064_sata_phy_remove(struct platform_device *pdev)
	{
	struct qcom_apq8064_sata_phy *phy = platform_get_drvdata(pdev);

	clk_disable_unprepare(phy->cfg_clk);

	return 0;
	}

	static const struct of_device_id qcom_apq8064_sata_phy_of_match[] = {
	{ .compatible = "qcom,apq8064-sata-phy" },
	{ },
	};
	MODULE_DEVICE_TABLE(of, qcom_apq8064_sata_phy_of_match);

	static struct platform_driver qcom_apq8064_sata_phy_driver = {
	.probe = qcom_apq8064_sata_phy_probe,
	.remove = qcom_apq8064_sata_phy_remove,
	.driver = {
	.name = "qcom-apq8064-sata-phy",
	.owner = THIS_MODULE,
	.of_match_table = qcom_apq8064_sata_phy_of_match,
	}
	};
	module_platform_driver(qcom_apq8064_sata_phy_driver);

	MODULE_DESCRIPTION("QCOM apq8064 SATA PHY driver");
	MODULE_LICENSE("GPL v2");