Merge tag 'block-5.11-2021-01-10' of git://git.kernel.dk/linux-block

[linux/fpc-iii.git] / drivers / phy / qualcomm / phy-qcom-ipq806x-usb.c

// SPDX-License-Identifier: GPL-2.0-only

#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/regmap.h>
#include <linux/mfd/syscon.h>

/* USB QSCRATCH Hardware registers */
#define QSCRATCH_GENERAL_CFG            (0x08)
#define HSUSB_PHY_CTRL_REG              (0x10)

/* PHY_CTRL_REG */
#define HSUSB_CTRL_DMSEHV_CLAMP         BIT(24)
#define HSUSB_CTRL_USB2_SUSPEND         BIT(23)
#define HSUSB_CTRL_UTMI_CLK_EN          BIT(21)
#define HSUSB_CTRL_UTMI_OTG_VBUS_VALID  BIT(20)
#define HSUSB_CTRL_USE_CLKCORE          BIT(18)
#define HSUSB_CTRL_DPSEHV_CLAMP         BIT(17)
#define HSUSB_CTRL_COMMONONN            BIT(11)
#define HSUSB_CTRL_ID_HV_CLAMP          BIT(9)
#define HSUSB_CTRL_OTGSESSVLD_CLAMP     BIT(8)
#define HSUSB_CTRL_CLAMP_EN             BIT(7)
#define HSUSB_CTRL_RETENABLEN           BIT(1)
#define HSUSB_CTRL_POR                  BIT(0)

/* QSCRATCH_GENERAL_CFG */
#define HSUSB_GCFG_XHCI_REV             BIT(2)

/* USB QSCRATCH Hardware registers */
#define SSUSB_PHY_CTRL_REG              (0x00)
#define SSUSB_PHY_PARAM_CTRL_1          (0x04)
#define SSUSB_PHY_PARAM_CTRL_2          (0x08)
#define CR_PROTOCOL_DATA_IN_REG         (0x0c)
#define CR_PROTOCOL_DATA_OUT_REG        (0x10)
#define CR_PROTOCOL_CAP_ADDR_REG        (0x14)
#define CR_PROTOCOL_CAP_DATA_REG        (0x18)
#define CR_PROTOCOL_READ_REG            (0x1c)
#define CR_PROTOCOL_WRITE_REG           (0x20)

/* PHY_CTRL_REG */
#define SSUSB_CTRL_REF_USE_PAD          BIT(28)
#define SSUSB_CTRL_TEST_POWERDOWN       BIT(27)
#define SSUSB_CTRL_LANE0_PWR_PRESENT    BIT(24)
#define SSUSB_CTRL_SS_PHY_EN            BIT(8)
#define SSUSB_CTRL_SS_PHY_RESET         BIT(7)

/* SSPHY control registers - Does this need 0x30? */
#define SSPHY_CTRL_RX_OVRD_IN_HI(lane)  (0x1006 + 0x100 * (lane))
#define SSPHY_CTRL_TX_OVRD_DRV_LO(lane) (0x1002 + 0x100 * (lane))

/* SSPHY SoC version specific values */
#define SSPHY_RX_EQ_VALUE               4 /* Override value for rx_eq */
/* Override value for transmit preemphasis */
#define SSPHY_TX_DEEMPH_3_5DB           23
/* Override value for mpll */
#define SSPHY_MPLL_VALUE                0

/* QSCRATCH PHY_PARAM_CTRL1 fields */
#define PHY_PARAM_CTRL1_TX_FULL_SWING_MASK      GENMASK(26, 19)
#define PHY_PARAM_CTRL1_TX_DEEMPH_6DB_MASK      GENMASK(19, 13)
#define PHY_PARAM_CTRL1_TX_DEEMPH_3_5DB_MASK    GENMASK(13, 7)
#define PHY_PARAM_CTRL1_LOS_BIAS_MASK           GENMASK(7, 2)

#define PHY_PARAM_CTRL1_MASK                            \
                (PHY_PARAM_CTRL1_TX_FULL_SWING_MASK |   \
                 PHY_PARAM_CTRL1_TX_DEEMPH_6DB_MASK |   \
                 PHY_PARAM_CTRL1_TX_DEEMPH_3_5DB_MASK | \
                 PHY_PARAM_CTRL1_LOS_BIAS_MASK)

#define PHY_PARAM_CTRL1_TX_FULL_SWING(x)        \
                (((x) << 20) & PHY_PARAM_CTRL1_TX_FULL_SWING_MASK)
#define PHY_PARAM_CTRL1_TX_DEEMPH_6DB(x)        \
                (((x) << 14) & PHY_PARAM_CTRL1_TX_DEEMPH_6DB_MASK)
#define PHY_PARAM_CTRL1_TX_DEEMPH_3_5DB(x)      \
                (((x) <<  8) & PHY_PARAM_CTRL1_TX_DEEMPH_3_5DB_MASK)
#define PHY_PARAM_CTRL1_LOS_BIAS(x)     \
                (((x) <<  3) & PHY_PARAM_CTRL1_LOS_BIAS_MASK)

/* RX OVRD IN HI bits */
#define RX_OVRD_IN_HI_RX_RESET_OVRD             BIT(13)
#define RX_OVRD_IN_HI_RX_RX_RESET               BIT(12)
#define RX_OVRD_IN_HI_RX_EQ_OVRD                BIT(11)
#define RX_OVRD_IN_HI_RX_EQ_MASK                GENMASK(10, 7)
#define RX_OVRD_IN_HI_RX_EQ(x)                  ((x) << 8)
#define RX_OVRD_IN_HI_RX_EQ_EN_OVRD             BIT(7)
#define RX_OVRD_IN_HI_RX_EQ_EN                  BIT(6)
#define RX_OVRD_IN_HI_RX_LOS_FILTER_OVRD        BIT(5)
#define RX_OVRD_IN_HI_RX_LOS_FILTER_MASK        GENMASK(4, 2)
#define RX_OVRD_IN_HI_RX_RATE_OVRD              BIT(2)
#define RX_OVRD_IN_HI_RX_RATE_MASK              GENMASK(2, 0)

/* TX OVRD DRV LO register bits */
#define TX_OVRD_DRV_LO_AMPLITUDE_MASK           GENMASK(6, 0)
#define TX_OVRD_DRV_LO_PREEMPH_MASK             GENMASK(13, 6)
#define TX_OVRD_DRV_LO_PREEMPH(x)               ((x) << 7)
#define TX_OVRD_DRV_LO_EN                       BIT(14)

/* MPLL bits */
#define SSPHY_MPLL_MASK                         GENMASK(8, 5)
#define SSPHY_MPLL(x)                           ((x) << 5)

/* SS CAP register bits */
#define SS_CR_CAP_ADDR_REG                      BIT(0)
#define SS_CR_CAP_DATA_REG                      BIT(0)
#define SS_CR_READ_REG                          BIT(0)
#define SS_CR_WRITE_REG                         BIT(0)

struct usb_phy {
        void __iomem            *base;
        struct device           *dev;
        struct clk              *xo_clk;
        struct clk              *ref_clk;
        u32                     rx_eq;
        u32                     tx_deamp_3_5db;
        u32                     mpll;
};

struct phy_drvdata {
        struct phy_ops  ops;
        u32             clk_rate;
};

/**
 * Write register and read back masked value to confirm it is written
 *
 * @base - QCOM DWC3 PHY base virtual address.
 * @offset - register offset.
 * @mask - register bitmask specifying what should be updated
 * @val - value to write.
 */
static inline void usb_phy_write_readback(struct usb_phy *phy_dwc3,
                                          u32 offset,
                                          const u32 mask, u32 val)
{
        u32 write_val, tmp = readl(phy_dwc3->base + offset);

        tmp &= ~mask;           /* retain other bits */
        write_val = tmp | val;

        writel(write_val, phy_dwc3->base + offset);

        /* Read back to see if val was written */
        tmp = readl(phy_dwc3->base + offset);
        tmp &= mask;            /* clear other bits */

        if (tmp != val)
                dev_err(phy_dwc3->dev, "write: %x to QSCRATCH: %x FAILED\n", val, offset);
}

static int wait_for_latch(void __iomem *addr)
{
        u32 retry = 10;

        while (true) {
                if (!readl(addr))
                        break;

                if (--retry == 0)
                        return -ETIMEDOUT;

                usleep_range(10, 20);
        }

        return 0;
}

/**
 * Write SSPHY register
 *
 * @base - QCOM DWC3 PHY base virtual address.
 * @addr - SSPHY address to write.
 * @val - value to write.
 */
static int usb_ss_write_phycreg(struct usb_phy *phy_dwc3,
                                u32 addr, u32 val)
{
        int ret;

        writel(addr, phy_dwc3->base + CR_PROTOCOL_DATA_IN_REG);
        writel(SS_CR_CAP_ADDR_REG,
               phy_dwc3->base + CR_PROTOCOL_CAP_ADDR_REG);

        ret = wait_for_latch(phy_dwc3->base + CR_PROTOCOL_CAP_ADDR_REG);
        if (ret)
                goto err_wait;

        writel(val, phy_dwc3->base + CR_PROTOCOL_DATA_IN_REG);
        writel(SS_CR_CAP_DATA_REG,
               phy_dwc3->base + CR_PROTOCOL_CAP_DATA_REG);

        ret = wait_for_latch(phy_dwc3->base + CR_PROTOCOL_CAP_DATA_REG);
        if (ret)
                goto err_wait;

        writel(SS_CR_WRITE_REG, phy_dwc3->base + CR_PROTOCOL_WRITE_REG);

        ret = wait_for_latch(phy_dwc3->base + CR_PROTOCOL_WRITE_REG);

err_wait:
        if (ret)
                dev_err(phy_dwc3->dev, "timeout waiting for latch\n");
        return ret;
}

/**
 * Read SSPHY register.
 *
 * @base - QCOM DWC3 PHY base virtual address.
 * @addr - SSPHY address to read.
 */
static int usb_ss_read_phycreg(struct usb_phy *phy_dwc3,
                               u32 addr, u32 *val)
{
        int ret;

        writel(addr, phy_dwc3->base + CR_PROTOCOL_DATA_IN_REG);
        writel(SS_CR_CAP_ADDR_REG,
               phy_dwc3->base + CR_PROTOCOL_CAP_ADDR_REG);

        ret = wait_for_latch(phy_dwc3->base + CR_PROTOCOL_CAP_ADDR_REG);
        if (ret)
                goto err_wait;

        /*
         * Due to hardware bug, first read of SSPHY register might be
         * incorrect. Hence as workaround, SW should perform SSPHY register
         * read twice, but use only second read and ignore first read.
         */
        writel(SS_CR_READ_REG, phy_dwc3->base + CR_PROTOCOL_READ_REG);

        ret = wait_for_latch(phy_dwc3->base + CR_PROTOCOL_READ_REG);
        if (ret)
                goto err_wait;

        /* throwaway read */
        readl(phy_dwc3->base + CR_PROTOCOL_DATA_OUT_REG);

        writel(SS_CR_READ_REG, phy_dwc3->base + CR_PROTOCOL_READ_REG);

        ret = wait_for_latch(phy_dwc3->base + CR_PROTOCOL_READ_REG);
        if (ret)
                goto err_wait;

        *val = readl(phy_dwc3->base + CR_PROTOCOL_DATA_OUT_REG);

err_wait:
        return ret;
}

static int qcom_ipq806x_usb_hs_phy_init(struct phy *phy)
{
        struct usb_phy *phy_dwc3 = phy_get_drvdata(phy);
        int ret;
        u32 val;

        ret = clk_prepare_enable(phy_dwc3->xo_clk);
        if (ret)
                return ret;

        ret = clk_prepare_enable(phy_dwc3->ref_clk);
        if (ret) {
                clk_disable_unprepare(phy_dwc3->xo_clk);
                return ret;
        }

        /*
         * HSPHY Initialization: Enable UTMI clock, select 19.2MHz fsel
         * enable clamping, and disable RETENTION (power-on default is ENABLED)
         */
        val = HSUSB_CTRL_DPSEHV_CLAMP | HSUSB_CTRL_DMSEHV_CLAMP |
                HSUSB_CTRL_RETENABLEN  | HSUSB_CTRL_COMMONONN |
                HSUSB_CTRL_OTGSESSVLD_CLAMP | HSUSB_CTRL_ID_HV_CLAMP |
                HSUSB_CTRL_DPSEHV_CLAMP | HSUSB_CTRL_UTMI_OTG_VBUS_VALID |
                HSUSB_CTRL_UTMI_CLK_EN | HSUSB_CTRL_CLAMP_EN | 0x70;

        /* use core clock if external reference is not present */
        if (!phy_dwc3->xo_clk)
                val |= HSUSB_CTRL_USE_CLKCORE;

        writel(val, phy_dwc3->base + HSUSB_PHY_CTRL_REG);
        usleep_range(2000, 2200);

        /* Disable (bypass) VBUS and ID filters */
        writel(HSUSB_GCFG_XHCI_REV, phy_dwc3->base + QSCRATCH_GENERAL_CFG);

        return 0;
}

static int qcom_ipq806x_usb_hs_phy_exit(struct phy *phy)
{
        struct usb_phy *phy_dwc3 = phy_get_drvdata(phy);

        clk_disable_unprepare(phy_dwc3->ref_clk);
        clk_disable_unprepare(phy_dwc3->xo_clk);

        return 0;
}

static int qcom_ipq806x_usb_ss_phy_init(struct phy *phy)
{
        struct usb_phy *phy_dwc3 = phy_get_drvdata(phy);
        int ret;
        u32 data;

        ret = clk_prepare_enable(phy_dwc3->xo_clk);
        if (ret)
                return ret;

        ret = clk_prepare_enable(phy_dwc3->ref_clk);
        if (ret) {
                clk_disable_unprepare(phy_dwc3->xo_clk);
                return ret;
        }

        /* reset phy */
        data = readl(phy_dwc3->base + SSUSB_PHY_CTRL_REG);
        writel(data | SSUSB_CTRL_SS_PHY_RESET,
               phy_dwc3->base + SSUSB_PHY_CTRL_REG);
        usleep_range(2000, 2200);
        writel(data, phy_dwc3->base + SSUSB_PHY_CTRL_REG);

        /* clear REF_PAD if we don't have XO clk */
        if (!phy_dwc3->xo_clk)
                data &= ~SSUSB_CTRL_REF_USE_PAD;
        else
                data |= SSUSB_CTRL_REF_USE_PAD;

        writel(data, phy_dwc3->base + SSUSB_PHY_CTRL_REG);

        /* wait for ref clk to become stable, this can take up to 30ms */
        msleep(30);

        data |= SSUSB_CTRL_SS_PHY_EN | SSUSB_CTRL_LANE0_PWR_PRESENT;
        writel(data, phy_dwc3->base + SSUSB_PHY_CTRL_REG);

        /*
         * WORKAROUND: There is SSPHY suspend bug due to which USB enumerates
         * in HS mode instead of SS mode. Workaround it by asserting
         * LANE0.TX_ALT_BLOCK.EN_ALT_BUS to enable TX to use alt bus mode
         */
        ret = usb_ss_read_phycreg(phy_dwc3, 0x102D, &data);
        if (ret)
                goto err_phy_trans;

        data |= (1 << 7);
        ret = usb_ss_write_phycreg(phy_dwc3, 0x102D, data);
        if (ret)
                goto err_phy_trans;

        ret = usb_ss_read_phycreg(phy_dwc3, 0x1010, &data);
        if (ret)
                goto err_phy_trans;

        data &= ~0xff0;
        data |= 0x20;
        ret = usb_ss_write_phycreg(phy_dwc3, 0x1010, data);
        if (ret)
                goto err_phy_trans;

        /*
         * Fix RX Equalization setting as follows
         * LANE0.RX_OVRD_IN_HI. RX_EQ_EN set to 0
         * LANE0.RX_OVRD_IN_HI.RX_EQ_EN_OVRD set to 1
         * LANE0.RX_OVRD_IN_HI.RX_EQ set based on SoC version
         * LANE0.RX_OVRD_IN_HI.RX_EQ_OVRD set to 1
         */
        ret = usb_ss_read_phycreg(phy_dwc3, SSPHY_CTRL_RX_OVRD_IN_HI(0), &data);
        if (ret)
                goto err_phy_trans;

        data &= ~RX_OVRD_IN_HI_RX_EQ_EN;
        data |= RX_OVRD_IN_HI_RX_EQ_EN_OVRD;
        data &= ~RX_OVRD_IN_HI_RX_EQ_MASK;
        data |= RX_OVRD_IN_HI_RX_EQ(phy_dwc3->rx_eq);
        data |= RX_OVRD_IN_HI_RX_EQ_OVRD;
        ret = usb_ss_write_phycreg(phy_dwc3,
                                   SSPHY_CTRL_RX_OVRD_IN_HI(0), data);
        if (ret)
                goto err_phy_trans;

        /*
         * Set EQ and TX launch amplitudes as follows
         * LANE0.TX_OVRD_DRV_LO.PREEMPH set based on SoC version
         * LANE0.TX_OVRD_DRV_LO.AMPLITUDE set to 110
         * LANE0.TX_OVRD_DRV_LO.EN set to 1.
         */
        ret = usb_ss_read_phycreg(phy_dwc3,
                                  SSPHY_CTRL_TX_OVRD_DRV_LO(0), &data);
        if (ret)
                goto err_phy_trans;

        data &= ~TX_OVRD_DRV_LO_PREEMPH_MASK;
        data |= TX_OVRD_DRV_LO_PREEMPH(phy_dwc3->tx_deamp_3_5db);
        data &= ~TX_OVRD_DRV_LO_AMPLITUDE_MASK;
        data |= 0x6E;
        data |= TX_OVRD_DRV_LO_EN;
        ret = usb_ss_write_phycreg(phy_dwc3,
                                   SSPHY_CTRL_TX_OVRD_DRV_LO(0), data);
        if (ret)
                goto err_phy_trans;

        data = 0;
        data &= ~SSPHY_MPLL_MASK;
        data |= SSPHY_MPLL(phy_dwc3->mpll);
        usb_ss_write_phycreg(phy_dwc3, 0x30, data);

        /*
         * Set the QSCRATCH PHY_PARAM_CTRL1 parameters as follows
         * TX_FULL_SWING [26:20] amplitude to 110
         * TX_DEEMPH_6DB [19:14] to 32
         * TX_DEEMPH_3_5DB [13:8] set based on SoC version
         * LOS_BIAS [7:3] to 9
         */
        data = readl(phy_dwc3->base + SSUSB_PHY_PARAM_CTRL_1);

        data &= ~PHY_PARAM_CTRL1_MASK;

        data |= PHY_PARAM_CTRL1_TX_FULL_SWING(0x6e) |
                PHY_PARAM_CTRL1_TX_DEEMPH_6DB(0x20) |
                PHY_PARAM_CTRL1_TX_DEEMPH_3_5DB(phy_dwc3->tx_deamp_3_5db) |
                PHY_PARAM_CTRL1_LOS_BIAS(0x9);

        usb_phy_write_readback(phy_dwc3, SSUSB_PHY_PARAM_CTRL_1,
                               PHY_PARAM_CTRL1_MASK, data);

err_phy_trans:
        return ret;
}

static int qcom_ipq806x_usb_ss_phy_exit(struct phy *phy)
{
        struct usb_phy *phy_dwc3 = phy_get_drvdata(phy);

        /* Sequence to put SSPHY in low power state:
         * 1. Clear REF_PHY_EN in PHY_CTRL_REG
         * 2. Clear REF_USE_PAD in PHY_CTRL_REG
         * 3. Set TEST_POWERED_DOWN in PHY_CTRL_REG to enable PHY retention
         */
        usb_phy_write_readback(phy_dwc3, SSUSB_PHY_CTRL_REG,
                               SSUSB_CTRL_SS_PHY_EN, 0x0);
        usb_phy_write_readback(phy_dwc3, SSUSB_PHY_CTRL_REG,
                               SSUSB_CTRL_REF_USE_PAD, 0x0);
        usb_phy_write_readback(phy_dwc3, SSUSB_PHY_CTRL_REG,
                               SSUSB_CTRL_TEST_POWERDOWN, 0x0);

        clk_disable_unprepare(phy_dwc3->ref_clk);
        clk_disable_unprepare(phy_dwc3->xo_clk);

        return 0;
}

static const struct phy_drvdata qcom_ipq806x_usb_hs_drvdata = {
        .ops = {
                .init           = qcom_ipq806x_usb_hs_phy_init,
                .exit           = qcom_ipq806x_usb_hs_phy_exit,
                .owner          = THIS_MODULE,
        },
        .clk_rate = 60000000,
};

static const struct phy_drvdata qcom_ipq806x_usb_ss_drvdata = {
        .ops = {
                .init           = qcom_ipq806x_usb_ss_phy_init,
                .exit           = qcom_ipq806x_usb_ss_phy_exit,
                .owner          = THIS_MODULE,
        },
        .clk_rate = 125000000,
};

static const struct of_device_id qcom_ipq806x_usb_phy_table[] = {
        { .compatible = "qcom,ipq806x-usb-phy-hs",
          .data = &qcom_ipq806x_usb_hs_drvdata },
        { .compatible = "qcom,ipq806x-usb-phy-ss",
          .data = &qcom_ipq806x_usb_ss_drvdata },
        { /* Sentinel */ }
};
MODULE_DEVICE_TABLE(of, qcom_ipq806x_usb_phy_table);

static int qcom_ipq806x_usb_phy_probe(struct platform_device *pdev)
{
        struct resource *res;
        resource_size_t size;
        struct phy *generic_phy;
        struct usb_phy *phy_dwc3;
        const struct phy_drvdata *data;
        struct phy_provider *phy_provider;

        phy_dwc3 = devm_kzalloc(&pdev->dev, sizeof(*phy_dwc3), GFP_KERNEL);
        if (!phy_dwc3)
                return -ENOMEM;

        data = of_device_get_match_data(&pdev->dev);

        phy_dwc3->dev = &pdev->dev;

        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        if (!res)
                return -EINVAL;
        size = resource_size(res);
        phy_dwc3->base = devm_ioremap(phy_dwc3->dev, res->start, size);

        if (!phy_dwc3->base) {
                dev_err(phy_dwc3->dev, "failed to map reg\n");
                return -ENOMEM;
        }

        phy_dwc3->ref_clk = devm_clk_get(phy_dwc3->dev, "ref");
        if (IS_ERR(phy_dwc3->ref_clk)) {
                dev_dbg(phy_dwc3->dev, "cannot get reference clock\n");
                return PTR_ERR(phy_dwc3->ref_clk);
        }

        clk_set_rate(phy_dwc3->ref_clk, data->clk_rate);

        phy_dwc3->xo_clk = devm_clk_get(phy_dwc3->dev, "xo");
        if (IS_ERR(phy_dwc3->xo_clk)) {
                dev_dbg(phy_dwc3->dev, "cannot get TCXO clock\n");
                phy_dwc3->xo_clk = NULL;
        }

        /* Parse device node to probe HSIO settings */
        if (device_property_read_u32(&pdev->dev, "qcom,rx-eq",
                                     &phy_dwc3->rx_eq))
                phy_dwc3->rx_eq = SSPHY_RX_EQ_VALUE;

        if (device_property_read_u32(&pdev->dev, "qcom,tx-deamp_3_5db",
                                     &phy_dwc3->tx_deamp_3_5db))
                phy_dwc3->tx_deamp_3_5db = SSPHY_TX_DEEMPH_3_5DB;

        if (device_property_read_u32(&pdev->dev, "qcom,mpll", &phy_dwc3->mpll))
                phy_dwc3->mpll = SSPHY_MPLL_VALUE;

        generic_phy = devm_phy_create(phy_dwc3->dev, pdev->dev.of_node, &data->ops);

        if (IS_ERR(generic_phy))
                return PTR_ERR(generic_phy);

        phy_set_drvdata(generic_phy, phy_dwc3);
        platform_set_drvdata(pdev, phy_dwc3);

        phy_provider = devm_of_phy_provider_register(phy_dwc3->dev,
                                                     of_phy_simple_xlate);

        if (IS_ERR(phy_provider))
                return PTR_ERR(phy_provider);

        return 0;
}

static struct platform_driver qcom_ipq806x_usb_phy_driver = {
        .probe          = qcom_ipq806x_usb_phy_probe,
        .driver         = {
                .name   = "qcom-ipq806x-usb-phy",
                .of_match_table = qcom_ipq806x_usb_phy_table,
        },
};

module_platform_driver(qcom_ipq806x_usb_phy_driver);

MODULE_ALIAS("platform:phy-qcom-ipq806x-usb");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Andy Gross <agross@codeaurora.org>");
MODULE_AUTHOR("Ivan T. Ivanov <iivanov@mm-sol.com>");
MODULE_DESCRIPTION("DesignWare USB3 QCOM PHY driver");