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    Subject[PATCH 10/18] usb: gadget: tegra-xudc: Add usb-phy support
    Date
    usb-phy is used to get notified on the USB role changes. Get usb-phy from
    the utmi phy.

    Signed-off-by: Nagarjuna Kristam <nkristam@nvidia.com>
    ---
    drivers/usb/gadget/udc/tegra-xudc.c | 39 +++++++++++++++++++++++++++++++++----
    1 file changed, 35 insertions(+), 4 deletions(-)

    diff --git a/drivers/usb/gadget/udc/tegra-xudc.c b/drivers/usb/gadget/udc/tegra-xudc.c
    index 6ddb974..0f27d57 100644
    --- a/drivers/usb/gadget/udc/tegra-xudc.c
    +++ b/drivers/usb/gadget/udc/tegra-xudc.c
    @@ -26,7 +26,9 @@
    #include <linux/reset.h>
    #include <linux/usb/ch9.h>
    #include <linux/usb/gadget.h>
    +#include <linux/usb/otg.h>
    #include <linux/usb/role.h>
    +#include <linux/usb/phy.h>
    #include <linux/workqueue.h>

    /* XUSB_DEV registers */
    @@ -488,6 +490,9 @@ struct tegra_xudc {
    bool suspended;
    bool powergated;

    + struct usb_phy *usbphy;
    + struct notifier_block vbus_nb;
    +
    struct completion disconnect_complete;

    bool selfpowered;
    @@ -678,7 +683,22 @@ static void tegra_xudc_usb_role_sw_work(struct work_struct *work)
    tegra_xudc_device_mode_on(xudc);
    else
    tegra_xudc_device_mode_off(xudc);
    +}
    +
    +static int tegra_xudc_vbus_notifier(struct notifier_block *nb,
    + unsigned long action, void *data)
    +{
    + struct tegra_xudc *xudc = container_of(nb, struct tegra_xudc,
    + vbus_nb);
    +
    + dev_dbg(xudc->dev, "%s action is %ld\n", __func__, action);
    +
    + xudc->role = (enum usb_role)action;

    + if (!xudc->suspended)
    + schedule_work(&xudc->usb_role_sw_work);
    +
    + return NOTIFY_OK;
    }

    static void tegra_xudc_plc_reset_work(struct work_struct *work)
    @@ -1949,6 +1969,9 @@ static int tegra_xudc_gadget_start(struct usb_gadget *gadget,
    xudc_writel(xudc, val, CTRL);
    }

    + if (xudc->usbphy)
    + otg_set_peripheral(xudc->usbphy->otg, gadget);
    +
    xudc->driver = driver;
    unlock:
    dev_dbg(xudc->dev, "%s: ret value is %d", __func__, ret);
    @@ -1969,6 +1992,9 @@ static int tegra_xudc_gadget_stop(struct usb_gadget *gadget)

    spin_lock_irqsave(&xudc->lock, flags);

    + if (xudc->usbphy)
    + otg_set_peripheral(xudc->usbphy->otg, NULL);
    +
    val = xudc_readl(xudc, CTRL);
    val &= ~(CTRL_IE | CTRL_ENABLE);
    xudc_writel(xudc, val, CTRL);
    @@ -3573,10 +3599,15 @@ static int tegra_xudc_probe(struct platform_device *pdev)
    INIT_DELAYED_WORK(&xudc->port_reset_war_work,
    tegra_xudc_port_reset_war_work);

    - /* Set the mode as device mode and this keeps phy always ON */
    - dev_info(xudc->dev, "Set usb role to device mode always");
    - xudc->role = USB_ROLE_DEVICE;
    - schedule_work(&xudc->usb_role_sw_work);
    + xudc->vbus_nb.notifier_call = tegra_xudc_vbus_notifier;
    + xudc->usbphy = devm_usb_get_phy_by_node(xudc->dev,
    + xudc->utmi_phy->dev.of_node,
    + &xudc->vbus_nb);
    + if (IS_ERR(xudc->usbphy)) {
    + err = PTR_ERR(xudc->usbphy);
    + dev_err(xudc->dev, "failed to get usbphy phy: %d\n", err);
    + goto free_eps;
    + }

    pm_runtime_enable(&pdev->dev);

    --
    2.7.4
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