root/drivers/phy/motorola/phy-mapphone-mdm6600.c 
// SPDX-License-Identifier: GPL-2.0
/*
 * Motorola Mapphone MDM6600 modem GPIO controlled USB PHY driver
 * Copyright (C) 2018 Tony Lindgren <tony@atomide.com>
 */

#include <linux/delay.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

#include <linux/gpio/consumer.h>
#include <linux/of_platform.h>
#include <linux/phy/phy.h>
#include <linux/pinctrl/consumer.h>

#define PHY_MDM6600_PHY_DELAY_MS        4000    /* PHY enable 2.2s to 3.5s */
#define PHY_MDM6600_ENABLED_DELAY_MS    8000    /* 8s more total for MDM6600 */
#define PHY_MDM6600_WAKE_KICK_MS        600     /* time on after GPIO toggle */
#define MDM6600_MODEM_IDLE_DELAY_MS     1000    /* modem after USB suspend */
#define MDM6600_MODEM_WAKE_DELAY_MS     200     /* modem response after idle */

enum phy_mdm6600_ctrl_lines {
        PHY_MDM6600_ENABLE,                     /* USB PHY enable */
        PHY_MDM6600_POWER,                      /* Device power */
        PHY_MDM6600_RESET,                      /* Device reset */
        PHY_MDM6600_NR_CTRL_LINES,
};

enum phy_mdm6600_bootmode_lines {
        PHY_MDM6600_MODE0,                      /* out USB mode0 and OOB wake */
        PHY_MDM6600_MODE1,                      /* out USB mode1, in OOB wake */
        PHY_MDM6600_NR_MODE_LINES,
};

enum phy_mdm6600_cmd_lines {
        PHY_MDM6600_CMD0,
        PHY_MDM6600_CMD1,
        PHY_MDM6600_CMD2,
        PHY_MDM6600_NR_CMD_LINES,
};

enum phy_mdm6600_status_lines {
        PHY_MDM6600_STATUS0,
        PHY_MDM6600_STATUS1,
        PHY_MDM6600_STATUS2,
        PHY_MDM6600_NR_STATUS_LINES,
};

/*
 * MDM6600 command codes. These are based on Motorola Mapphone Linux
 * kernel tree.
 */
enum phy_mdm6600_cmd {
        PHY_MDM6600_CMD_BP_PANIC_ACK,
        PHY_MDM6600_CMD_DATA_ONLY_BYPASS,       /* Reroute USB to CPCAP PHY */
        PHY_MDM6600_CMD_FULL_BYPASS,            /* Reroute USB to CPCAP PHY */
        PHY_MDM6600_CMD_NO_BYPASS,              /* Request normal USB mode */
        PHY_MDM6600_CMD_BP_SHUTDOWN_REQ,        /* Request device power off */
        PHY_MDM6600_CMD_BP_UNKNOWN_5,
        PHY_MDM6600_CMD_BP_UNKNOWN_6,
        PHY_MDM6600_CMD_UNDEFINED,
};

/*
 * MDM6600 status codes. These are based on Motorola Mapphone Linux
 * kernel tree.
 */
enum phy_mdm6600_status {
        PHY_MDM6600_STATUS_PANIC,               /* Seems to be really off */
        PHY_MDM6600_STATUS_PANIC_BUSY_WAIT,
        PHY_MDM6600_STATUS_QC_DLOAD,
        PHY_MDM6600_STATUS_RAM_DOWNLOADER,      /* MDM6600 USB flashing mode */
        PHY_MDM6600_STATUS_PHONE_CODE_AWAKE,    /* MDM6600 normal USB mode */
        PHY_MDM6600_STATUS_PHONE_CODE_ASLEEP,
        PHY_MDM6600_STATUS_SHUTDOWN_ACK,
        PHY_MDM6600_STATUS_UNDEFINED,
};

static const char * const
phy_mdm6600_status_name[] = {
        "off", "busy", "qc_dl", "ram_dl", "awake",
        "asleep", "shutdown", "undefined",
};

struct phy_mdm6600 {
        struct device *dev;
        struct phy *generic_phy;
        struct phy_provider *phy_provider;
        struct gpio_desc *ctrl_gpios[PHY_MDM6600_NR_CTRL_LINES];
        struct gpio_descs *mode_gpios;
        struct gpio_descs *status_gpios;
        struct gpio_descs *cmd_gpios;
        struct delayed_work bootup_work;
        struct delayed_work status_work;
        struct delayed_work modem_wake_work;
        struct completion ack;
        bool enabled;                           /* mdm6600 phy enabled */
        bool running;                           /* mdm6600 boot done */
        bool awake;                             /* mdm6600 respnds on n_gsm */
        int status;
};

static int phy_mdm6600_init(struct phy *x)
{
        struct phy_mdm6600 *ddata = phy_get_drvdata(x);
        struct gpio_desc *enable_gpio = ddata->ctrl_gpios[PHY_MDM6600_ENABLE];

        if (!ddata->enabled)
                return -EPROBE_DEFER;

        gpiod_set_value_cansleep(enable_gpio, 0);

        return 0;
}

static int phy_mdm6600_power_on(struct phy *x)
{
        struct phy_mdm6600 *ddata = phy_get_drvdata(x);
        struct gpio_desc *enable_gpio = ddata->ctrl_gpios[PHY_MDM6600_ENABLE];

        if (!ddata->enabled)
                return -ENODEV;

        gpiod_set_value_cansleep(enable_gpio, 1);

        /* Allow aggressive PM for USB, it's only needed for n_gsm port */
        if (pm_runtime_enabled(&x->dev))
                phy_pm_runtime_put(x);

        return 0;
}

static int phy_mdm6600_power_off(struct phy *x)
{
        struct phy_mdm6600 *ddata = phy_get_drvdata(x);
        struct gpio_desc *enable_gpio = ddata->ctrl_gpios[PHY_MDM6600_ENABLE];
        int error;

        if (!ddata->enabled)
                return -ENODEV;

        /* Paired with phy_pm_runtime_put() in phy_mdm6600_power_on() */
        if (pm_runtime_enabled(&x->dev)) {
                error = phy_pm_runtime_get(x);
                if (error < 0 && error != -EINPROGRESS)
                        dev_warn(ddata->dev, "%s: phy_pm_runtime_get: %i\n",
                                 __func__, error);
        }

        gpiod_set_value_cansleep(enable_gpio, 0);

        return 0;
}

static const struct phy_ops gpio_usb_ops = {
        .init = phy_mdm6600_init,
        .power_on = phy_mdm6600_power_on,
        .power_off = phy_mdm6600_power_off,
        .owner = THIS_MODULE,
};

/**
 * phy_mdm6600_cmd() - send a command request to mdm6600
 * @ddata: device driver data
 * @val: value of cmd to be set
 *
 * Configures the three command request GPIOs to the specified value.
 */
static void phy_mdm6600_cmd(struct phy_mdm6600 *ddata, int val)
{
        DECLARE_BITMAP(values, PHY_MDM6600_NR_CMD_LINES);

        values[0] = val;

        gpiod_multi_set_value_cansleep(ddata->cmd_gpios, values);
}

/**
 * phy_mdm6600_status() - read mdm6600 status lines
 * @work: work structure
 */
static void phy_mdm6600_status(struct work_struct *work)
{
        struct phy_mdm6600 *ddata;
        struct device *dev;
        DECLARE_BITMAP(values, PHY_MDM6600_NR_STATUS_LINES);
        int error;

        ddata = container_of(work, struct phy_mdm6600, status_work.work);
        dev = ddata->dev;

        error = gpiod_get_array_value_cansleep(PHY_MDM6600_NR_STATUS_LINES,
                                               ddata->status_gpios->desc,
                                               ddata->status_gpios->info,
                                               values);
        if (error)
                return;

        ddata->status = values[0] & ((1 << PHY_MDM6600_NR_STATUS_LINES) - 1);

        dev_info(dev, "modem status: %i %s\n",
                 ddata->status,
                 phy_mdm6600_status_name[ddata->status]);
        complete(&ddata->ack);
}

static irqreturn_t phy_mdm6600_irq_thread(int irq, void *data)
{
        struct phy_mdm6600 *ddata = data;

        schedule_delayed_work(&ddata->status_work, msecs_to_jiffies(10));

        return IRQ_HANDLED;
}

/**
 * phy_mdm6600_wakeirq_thread - handle mode1 line OOB wake after booting
 * @irq: interrupt
 * @data: interrupt handler data
 *
 * GPIO mode1 is used initially as output to configure the USB boot
 * mode for mdm6600. After booting it is used as input for OOB wake
 * signal from mdm6600 to the SoC. Just use it for debug info only
 * for now.
 */
static irqreturn_t phy_mdm6600_wakeirq_thread(int irq, void *data)
{
        struct phy_mdm6600 *ddata = data;
        struct gpio_desc *mode_gpio1;
        int error, wakeup;

        mode_gpio1 = ddata->mode_gpios->desc[PHY_MDM6600_MODE1];
        wakeup = gpiod_get_value(mode_gpio1);
        if (!wakeup)
                return IRQ_NONE;

        dev_dbg(ddata->dev, "OOB wake on mode_gpio1: %i\n", wakeup);
        error = pm_runtime_get_sync(ddata->dev);
        if (error < 0) {
                pm_runtime_put_noidle(ddata->dev);

                return IRQ_NONE;
        }

        /* Just wake-up and kick the autosuspend timer */
        pm_runtime_mark_last_busy(ddata->dev);
        pm_runtime_put_autosuspend(ddata->dev);

        return IRQ_HANDLED;
}

/**
 * phy_mdm6600_init_irq() - initialize mdm6600 status IRQ lines
 * @ddata: device driver data
 */
static void phy_mdm6600_init_irq(struct phy_mdm6600 *ddata)
{
        struct device *dev = ddata->dev;
        int i, error, irq;

        for (i = PHY_MDM6600_STATUS0;
             i <= PHY_MDM6600_STATUS2; i++) {
                struct gpio_desc *gpio = ddata->status_gpios->desc[i];

                irq = gpiod_to_irq(gpio);
                if (irq <= 0)
                        continue;

                error = devm_request_threaded_irq(dev, irq, NULL,
                                        phy_mdm6600_irq_thread,
                                        IRQF_TRIGGER_RISING |
                                        IRQF_TRIGGER_FALLING |
                                        IRQF_ONESHOT,
                                        "mdm6600",
                                        ddata);
                if (error)
                        dev_warn(dev, "no modem status irq%i: %i\n",
                                 irq, error);
        }
}

struct phy_mdm6600_map {
        const char *name;
        int direction;
};

static const struct phy_mdm6600_map
phy_mdm6600_ctrl_gpio_map[PHY_MDM6600_NR_CTRL_LINES] = {
        { "enable", GPIOD_OUT_LOW, },           /* low = phy disabled */
        { "power", GPIOD_OUT_LOW, },            /* low = off */
        { "reset", GPIOD_OUT_HIGH, },           /* high = reset */
};

/**
 * phy_mdm6600_init_lines() - initialize mdm6600 GPIO lines
 * @ddata: device driver data
 */
static int phy_mdm6600_init_lines(struct phy_mdm6600 *ddata)
{
        struct device *dev = ddata->dev;
        int i;

        /* MDM6600 control lines */
        for (i = 0; i < ARRAY_SIZE(phy_mdm6600_ctrl_gpio_map); i++) {
                const struct phy_mdm6600_map *map =
                        &phy_mdm6600_ctrl_gpio_map[i];
                struct gpio_desc **gpio = &ddata->ctrl_gpios[i];

                *gpio = devm_gpiod_get(dev, map->name, map->direction);
                if (IS_ERR(*gpio)) {
                        dev_info(dev, "gpio %s error %li\n",
                                 map->name, PTR_ERR(*gpio));
                        return PTR_ERR(*gpio);
                }
        }

        /* MDM6600 USB start-up mode output lines */
        ddata->mode_gpios = devm_gpiod_get_array(dev, "motorola,mode",
                                                 GPIOD_OUT_LOW);
        if (IS_ERR(ddata->mode_gpios))
                return PTR_ERR(ddata->mode_gpios);

        if (ddata->mode_gpios->ndescs != PHY_MDM6600_NR_MODE_LINES)
                return -EINVAL;

        /* MDM6600 status input lines */
        ddata->status_gpios = devm_gpiod_get_array(dev, "motorola,status",
                                                   GPIOD_IN);
        if (IS_ERR(ddata->status_gpios))
                return PTR_ERR(ddata->status_gpios);

        if (ddata->status_gpios->ndescs != PHY_MDM6600_NR_STATUS_LINES)
                return -EINVAL;

        /* MDM6600 cmd output lines */
        ddata->cmd_gpios = devm_gpiod_get_array(dev, "motorola,cmd",
                                                GPIOD_OUT_LOW);
        if (IS_ERR(ddata->cmd_gpios))
                return PTR_ERR(ddata->cmd_gpios);

        if (ddata->cmd_gpios->ndescs != PHY_MDM6600_NR_CMD_LINES)
                return -EINVAL;

        return 0;
}

/**
 * phy_mdm6600_device_power_on() - power on mdm6600 device
 * @ddata: device driver data
 *
 * To get the integrated USB phy in MDM6600 takes some hoops. We must ensure
 * the shared USB bootmode GPIOs are configured, then request modem start-up,
 * reset and power-up.. And then we need to recycle the shared USB bootmode
 * GPIOs as they are also used for Out of Band (OOB) wake for the USB and
 * TS 27.010 serial mux.
 */
static int phy_mdm6600_device_power_on(struct phy_mdm6600 *ddata)
{
        struct gpio_desc *mode_gpio0, *mode_gpio1, *reset_gpio, *power_gpio;
        int error = 0, wakeirq;

        mode_gpio0 = ddata->mode_gpios->desc[PHY_MDM6600_MODE0];
        mode_gpio1 = ddata->mode_gpios->desc[PHY_MDM6600_MODE1];
        reset_gpio = ddata->ctrl_gpios[PHY_MDM6600_RESET];
        power_gpio = ddata->ctrl_gpios[PHY_MDM6600_POWER];

        /*
         * Shared GPIOs must be low for normal USB mode. After booting
         * they are used for OOB wake signaling. These can be also used
         * to configure USB flashing mode later on based on a module
         * parameter.
         */
        gpiod_set_value_cansleep(mode_gpio0, 0);
        gpiod_set_value_cansleep(mode_gpio1, 0);

        /* Request start-up mode */
        phy_mdm6600_cmd(ddata, PHY_MDM6600_CMD_NO_BYPASS);

        /* Request a reset first */
        gpiod_set_value_cansleep(reset_gpio, 0);
        msleep(100);

        /* Toggle power GPIO to request mdm6600 to start */
        gpiod_set_value_cansleep(power_gpio, 1);
        msleep(100);
        gpiod_set_value_cansleep(power_gpio, 0);

        /*
         * Looks like the USB PHY needs between 2.2 to 4 seconds.
         * If we try to use it before that, we will get L3 errors
         * from omap-usb-host trying to access the PHY. See also
         * phy_mdm6600_init() for -EPROBE_DEFER.
         */
        msleep(PHY_MDM6600_PHY_DELAY_MS);
        ddata->enabled = true;

        /* Booting up the rest of MDM6600 will take total about 8 seconds */
        dev_info(ddata->dev, "Waiting for power up request to complete..\n");
        if (wait_for_completion_timeout(&ddata->ack,
                        msecs_to_jiffies(PHY_MDM6600_ENABLED_DELAY_MS))) {
                if (ddata->status > PHY_MDM6600_STATUS_PANIC &&
                    ddata->status < PHY_MDM6600_STATUS_SHUTDOWN_ACK)
                        dev_info(ddata->dev, "Powered up OK\n");
        } else {
                ddata->enabled = false;
                error = -ETIMEDOUT;
                dev_err(ddata->dev, "Timed out powering up\n");
        }

        /* Reconfigure mode1 GPIO as input for OOB wake */
        gpiod_direction_input(mode_gpio1);

        wakeirq = gpiod_to_irq(mode_gpio1);
        if (wakeirq <= 0)
                return wakeirq;

        error = devm_request_threaded_irq(ddata->dev, wakeirq, NULL,
                                          phy_mdm6600_wakeirq_thread,
                                          IRQF_TRIGGER_RISING |
                                          IRQF_TRIGGER_FALLING |
                                          IRQF_ONESHOT,
                                          "mdm6600-wake",
                                          ddata);
        if (error)
                dev_warn(ddata->dev, "no modem wakeirq irq%i: %i\n",
                         wakeirq, error);

        ddata->running = true;

        return error;
}

/**
 * phy_mdm6600_device_power_off() - power off mdm6600 device
 * @ddata: device driver data
 */
static void phy_mdm6600_device_power_off(struct phy_mdm6600 *ddata)
{
        struct gpio_desc *reset_gpio =
                ddata->ctrl_gpios[PHY_MDM6600_RESET];
        int error;

        ddata->enabled = false;
        phy_mdm6600_cmd(ddata, PHY_MDM6600_CMD_BP_SHUTDOWN_REQ);
        msleep(100);

        gpiod_set_value_cansleep(reset_gpio, 1);

        dev_info(ddata->dev, "Waiting for power down request to complete.. ");
        if (wait_for_completion_timeout(&ddata->ack,
                                        msecs_to_jiffies(5000))) {
                if (ddata->status == PHY_MDM6600_STATUS_PANIC)
                        dev_info(ddata->dev, "Powered down OK\n");
        } else {
                dev_err(ddata->dev, "Timed out powering down\n");
        }

        /*
         * Keep reset gpio high with padconf internal pull-up resistor to
         * prevent modem from waking up during deeper SoC idle states. The
         * gpio bank lines can have glitches if not in the always-on wkup
         * domain.
         */
        error = pinctrl_pm_select_sleep_state(ddata->dev);
        if (error)
                dev_warn(ddata->dev, "%s: error with sleep_state: %i\n",
                         __func__, error);
}

static void phy_mdm6600_deferred_power_on(struct work_struct *work)
{
        struct phy_mdm6600 *ddata;
        int error;

        ddata = container_of(work, struct phy_mdm6600, bootup_work.work);

        error = phy_mdm6600_device_power_on(ddata);
        if (error)
                dev_err(ddata->dev, "Device not functional\n");
}

/*
 * USB suspend puts mdm6600 into low power mode. For any n_gsm using apps,
 * we need to keep the modem awake by kicking it's mode0 GPIO. This will
 * keep the modem awake for about 1.2 seconds. When no n_gsm apps are using
 * the modem, runtime PM auto mode can be enabled so modem can enter low
 * power mode.
 */
static void phy_mdm6600_wake_modem(struct phy_mdm6600 *ddata)
{
        struct gpio_desc *mode_gpio0;

        mode_gpio0 = ddata->mode_gpios->desc[PHY_MDM6600_MODE0];
        gpiod_set_value_cansleep(mode_gpio0, 1);
        usleep_range(5, 15);
        gpiod_set_value_cansleep(mode_gpio0, 0);
        if (ddata->awake)
                usleep_range(5, 15);
        else
                msleep(MDM6600_MODEM_WAKE_DELAY_MS);
}

static void phy_mdm6600_modem_wake(struct work_struct *work)
{
        struct phy_mdm6600 *ddata;

        ddata = container_of(work, struct phy_mdm6600, modem_wake_work.work);
        phy_mdm6600_wake_modem(ddata);

        /*
         * The modem does not always stay awake 1.2 seconds after toggling
         * the wake GPIO, and sometimes it idles after about some 600 ms
         * making writes time out.
         */
        schedule_delayed_work(&ddata->modem_wake_work,
                              msecs_to_jiffies(PHY_MDM6600_WAKE_KICK_MS));
}

static int __maybe_unused phy_mdm6600_runtime_suspend(struct device *dev)
{
        struct phy_mdm6600 *ddata = dev_get_drvdata(dev);

        cancel_delayed_work_sync(&ddata->modem_wake_work);
        ddata->awake = false;

        return 0;
}

static int __maybe_unused phy_mdm6600_runtime_resume(struct device *dev)
{
        struct phy_mdm6600 *ddata = dev_get_drvdata(dev);

        phy_mdm6600_modem_wake(&ddata->modem_wake_work.work);
        ddata->awake = true;

        return 0;
}

static const struct dev_pm_ops phy_mdm6600_pm_ops = {
        SET_RUNTIME_PM_OPS(phy_mdm6600_runtime_suspend,
                           phy_mdm6600_runtime_resume, NULL)
};

static const struct of_device_id phy_mdm6600_id_table[] = {
        { .compatible = "motorola,mapphone-mdm6600", },
        {},
};
MODULE_DEVICE_TABLE(of, phy_mdm6600_id_table);

static int phy_mdm6600_probe(struct platform_device *pdev)
{
        struct phy_mdm6600 *ddata;
        int error;

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

        INIT_DELAYED_WORK(&ddata->bootup_work,
                          phy_mdm6600_deferred_power_on);
        INIT_DELAYED_WORK(&ddata->status_work, phy_mdm6600_status);
        INIT_DELAYED_WORK(&ddata->modem_wake_work, phy_mdm6600_modem_wake);
        init_completion(&ddata->ack);

        ddata->dev = &pdev->dev;
        platform_set_drvdata(pdev, ddata);

        error = phy_mdm6600_init_lines(ddata);
        if (error)
                return error;

        phy_mdm6600_init_irq(ddata);
        schedule_delayed_work(&ddata->bootup_work, 0);

        /*
         * See phy_mdm6600_device_power_on(). We should be able
         * to remove this eventually when ohci-platform can deal
         * with -EPROBE_DEFER.
         */
        msleep(PHY_MDM6600_PHY_DELAY_MS + 500);

        /*
         * Enable PM runtime only after PHY has been powered up properly.
         * It is currently only needed after USB suspends mdm6600 and n_gsm
         * needs to access the device. We don't want to do this earlier as
         * gpio mode0 pin doubles as mdm6600 wake-up gpio.
         */
        pm_runtime_use_autosuspend(ddata->dev);
        pm_runtime_set_autosuspend_delay(ddata->dev,
                                         MDM6600_MODEM_IDLE_DELAY_MS);
        pm_runtime_enable(ddata->dev);
        error = pm_runtime_get_sync(ddata->dev);
        if (error < 0) {
                dev_warn(ddata->dev, "failed to wake modem: %i\n", error);
                pm_runtime_put_noidle(ddata->dev);
                goto cleanup;
        }

        ddata->generic_phy = devm_phy_create(ddata->dev, NULL, &gpio_usb_ops);
        if (IS_ERR(ddata->generic_phy)) {
                error = PTR_ERR(ddata->generic_phy);
                goto idle;
        }

        phy_set_drvdata(ddata->generic_phy, ddata);

        ddata->phy_provider =
                devm_of_phy_provider_register(ddata->dev,
                                              of_phy_simple_xlate);
        if (IS_ERR(ddata->phy_provider))
                error = PTR_ERR(ddata->phy_provider);

idle:
        pm_runtime_mark_last_busy(ddata->dev);
        pm_runtime_put_autosuspend(ddata->dev);

cleanup:
        if (error < 0) {
                phy_mdm6600_device_power_off(ddata);
                pm_runtime_disable(ddata->dev);
                pm_runtime_dont_use_autosuspend(ddata->dev);
        }

        return error;
}

static void phy_mdm6600_remove(struct platform_device *pdev)
{
        struct phy_mdm6600 *ddata = platform_get_drvdata(pdev);
        struct gpio_desc *reset_gpio = ddata->ctrl_gpios[PHY_MDM6600_RESET];

        pm_runtime_get_noresume(ddata->dev);
        pm_runtime_dont_use_autosuspend(ddata->dev);
        pm_runtime_put_sync(ddata->dev);
        pm_runtime_disable(ddata->dev);

        if (!ddata->running)
                wait_for_completion_timeout(&ddata->ack,
                        msecs_to_jiffies(PHY_MDM6600_ENABLED_DELAY_MS));

        gpiod_set_value_cansleep(reset_gpio, 1);
        phy_mdm6600_device_power_off(ddata);

        cancel_delayed_work_sync(&ddata->modem_wake_work);
        cancel_delayed_work_sync(&ddata->bootup_work);
        cancel_delayed_work_sync(&ddata->status_work);
}

static struct platform_driver phy_mdm6600_driver = {
        .probe = phy_mdm6600_probe,
        .remove = phy_mdm6600_remove,
        .driver = {
                .name = "phy-mapphone-mdm6600",
                .pm = &phy_mdm6600_pm_ops,
                .of_match_table = of_match_ptr(phy_mdm6600_id_table),
        },
};

module_platform_driver(phy_mdm6600_driver);

MODULE_ALIAS("platform:gpio_usb");
MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
MODULE_DESCRIPTION("mdm6600 gpio usb phy driver");
MODULE_LICENSE("GPL v2");