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Date:   Mon, 4 Mar 2019 11:01:41 +0000
From:   Pawel Laszczak <pawell@...ence.com>
To:     Chunfeng Yun <chunfeng.yun@...iatek.com>
CC:     "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "felipe.balbi@...ux.intel.com" <felipe.balbi@...ux.intel.com>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "hdegoede@...hat.com" <hdegoede@...hat.com>,
        "heikki.krogerus@...ux.intel.com" <heikki.krogerus@...ux.intel.com>,
        "andy.shevchenko@...il.com" <andy.shevchenko@...il.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "rogerq@...com" <rogerq@...com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jbergsagel@...com" <jbergsagel@...com>,
        "nsekhar@...com" <nsekhar@...com>, "nm@...com" <nm@...com>,
        Suresh Punnoose <sureshp@...ence.com>,
        "peter.chen@....com" <peter.chen@....com>,
        Rahul Kumar <kurahul@...ence.com>
Subject: RE: [PATCH v4 5/6] usb:cdns3 Add Cadence USB3 DRD Driver

Hi, 
>
>hi,
>On Thu, 2019-02-14 at 19:45 +0000, Pawel Laszczak wrote:
>> This patch introduce new Cadence USBSS DRD driver to linux kernel.
>>
>> The Cadence USBSS DRD Driver is a highly configurable IP Core whichi
>> can be instantiated as Dual-Role Device (DRD), Peripheral Only and
>> Host Only (XHCI)configurations.
>>
>> The current driver has been validated with FPGA burned. We have support
>> for PCIe bus, which is used on FPGA prototyping.
>>
>> The host side of USBSS-DRD controller is compliance with XHCI
>> specification, so it works with standard XHCI linux driver.
>>
>> Signed-off-by: Pawel Laszczak <pawell@...ence.com>
>> ---
>>  drivers/usb/Kconfig                |    2 +
>>  drivers/usb/Makefile               |    2 +
>>  drivers/usb/cdns3/Kconfig          |   44 +
>>  drivers/usb/cdns3/Makefile         |   14 +
>>  drivers/usb/cdns3/cdns3-pci-wrap.c |  155 +++
>>  drivers/usb/cdns3/core.c           |  403 ++++++
>>  drivers/usb/cdns3/core.h           |  116 ++
>>  drivers/usb/cdns3/debug.h          |  168 +++
>>  drivers/usb/cdns3/debugfs.c        |  164 +++
>>  drivers/usb/cdns3/drd.c            |  365 +++++
>>  drivers/usb/cdns3/drd.h            |  162 +++
>>  drivers/usb/cdns3/ep0.c            |  907 +++++++++++++
>>  drivers/usb/cdns3/gadget-export.h  |   28 +
>>  drivers/usb/cdns3/gadget.c         | 2003 ++++++++++++++++++++++++++++
>>  drivers/usb/cdns3/gadget.h         | 1207 +++++++++++++++++
>>  drivers/usb/cdns3/host-export.h    |   28 +
>>  drivers/usb/cdns3/host.c           |   72 +
>>  drivers/usb/cdns3/trace.c          |   23 +
>>  drivers/usb/cdns3/trace.h          |  404 ++++++
>>  19 files changed, 6267 insertions(+)
>>  create mode 100644 drivers/usb/cdns3/Kconfig
>>  create mode 100644 drivers/usb/cdns3/Makefile
>>  create mode 100644 drivers/usb/cdns3/cdns3-pci-wrap.c
>>  create mode 100644 drivers/usb/cdns3/core.c
>>  create mode 100644 drivers/usb/cdns3/core.h
>>  create mode 100644 drivers/usb/cdns3/debug.h
>>  create mode 100644 drivers/usb/cdns3/debugfs.c
>>  create mode 100644 drivers/usb/cdns3/drd.c
>>  create mode 100644 drivers/usb/cdns3/drd.h
>>  create mode 100644 drivers/usb/cdns3/ep0.c
>>  create mode 100644 drivers/usb/cdns3/gadget-export.h
>>  create mode 100644 drivers/usb/cdns3/gadget.c
>>  create mode 100644 drivers/usb/cdns3/gadget.h
>>  create mode 100644 drivers/usb/cdns3/host-export.h
>>  create mode 100644 drivers/usb/cdns3/host.c
>>  create mode 100644 drivers/usb/cdns3/trace.c
>>  create mode 100644 drivers/usb/cdns3/trace.h
>>
>> diff --git a/drivers/usb/Kconfig b/drivers/usb/Kconfig
>> index 987fc5ba6321..5f9334019d04 100644
>> --- a/drivers/usb/Kconfig
>> +++ b/drivers/usb/Kconfig
>> @@ -112,6 +112,8 @@ source "drivers/usb/usbip/Kconfig"
>>
>>  endif
>>
>> +source "drivers/usb/cdns3/Kconfig"
>> +
>>  source "drivers/usb/mtu3/Kconfig"
>>
>>  source "drivers/usb/musb/Kconfig"
>> diff --git a/drivers/usb/Makefile b/drivers/usb/Makefile
>> index 7d1b8c82b208..ab125b966cac 100644
>> --- a/drivers/usb/Makefile
>> +++ b/drivers/usb/Makefile
>> @@ -12,6 +12,8 @@ obj-$(CONFIG_USB_DWC3)		+= dwc3/
>>  obj-$(CONFIG_USB_DWC2)		+= dwc2/
>>  obj-$(CONFIG_USB_ISP1760)	+= isp1760/
>>
>> +obj-$(CONFIG_USB_CDNS3)		+= cdns3/
>> +
>>  obj-$(CONFIG_USB_MON)		+= mon/
>>  obj-$(CONFIG_USB_MTU3)		+= mtu3/
>>
>> diff --git a/drivers/usb/cdns3/Kconfig b/drivers/usb/cdns3/Kconfig
>> new file mode 100644
>> index 000000000000..27cb3d8dbe3d
>> --- /dev/null
>> +++ b/drivers/usb/cdns3/Kconfig
>> @@ -0,0 +1,44 @@
>> +config USB_CDNS3
>> +	tristate "Cadence USB3 Dual-Role Controller"
>> +	depends on USB_SUPPORT && (USB || USB_GADGET) && HAS_DMA
>> +	help
>> +	  Say Y here if your system has a cadence USB3 dual-role controller.
>> +	  It supports: dual-role switch, Host-only, and Peripheral-only.
>> +
>> +	  If you choose to build this driver is a dynamically linked
>> +	  as module, the module will be called cdns3.ko.
>> +
>> +if USB_CDNS3
>> +
>> +config USB_CDNS3_GADGET
>> +        bool "Cadence USB3 device controller"
>> +        depends on USB_GADGET
>> +        help
>> +          Say Y here to enable device controller functionality of the
>> +          cadence USBSS-DEV driver.
>> +
>> +          This controller supports FF, HS and SS mode. It doesn't support
>> +          LS and SSP mode.
>> +
>> +config USB_CDNS3_HOST
>> +        bool "Cadence USB3 host controller"
>> +        depends on USB_XHCI_HCD
>> +        help
>> +          Say Y here to enable host controller functionality of the
>> +          cadence driver.
>> +
>> +          Host controller is compliant with XHCI so it will use
>> +          standard XHCI driver.
>> +
>> +config USB_CDNS3_PCI_WRAP
>> +	tristate "Cadence USB3 support on PCIe-based platforms"
>> +	depends on USB_PCI && ACPI
>> +	default USB_CDNS3
>> +	help
>> +	  If you're using the USBSS Core IP with a PCIe, please say
>> +	  'Y' or 'M' here.
>> +
>> +	  If you choose to build this driver as module it will
>> +	  be dynamically linked and module will be called cdns3-pci.ko
>> +
>> +endif
>> diff --git a/drivers/usb/cdns3/Makefile b/drivers/usb/cdns3/Makefile
>> new file mode 100644
>> index 000000000000..8f9438593375
>> --- /dev/null
>> +++ b/drivers/usb/cdns3/Makefile
>> @@ -0,0 +1,14 @@
>> +# SPDX-License-Identifier: GPL-2.0
>> +# define_trace.h needs to know how to find our header
>> +CFLAGS_trace.o				:= -I$(src)
>> +
>> +cdns3-y					:= core.o drd.o trace.o
>> +
>> +obj-$(CONFIG_USB_CDNS3)			+= cdns3.o
>> +ifneq ($(CONFIG_DEBUG_FS),)
>> +	cdns3-y				+= debugfs.o
>> +endif
>> +
>> +cdns3-$(CONFIG_USB_CDNS3_GADGET)	+= gadget.o ep0.o
>> +cdns3-$(CONFIG_USB_CDNS3_HOST)		+= host.o
>> +obj-$(CONFIG_USB_CDNS3_PCI_WRAP)	+= cdns3-pci-wrap.o
>when build as module:
>CONFIG_USB_CDNS3=m
>CONFIG_USB_CDNS3_GADGET=m
>CONFIG_USB_CDNS3_HOST=m

How you set such configuration ? From make menuconfig it's impossible. 

>there is an error:
>ERROR: "cdns3_handshake" [drivers/usb/cdns3/cdns3.ko] undefined!
>
>when only set:
>CONFIG_USB_CDNS3=y
>also encounter errors:
>drivers/usb/cdns3/drd.o: In function `cdns3_drd_switch_gadget':
>/drivers/usb/cdns3/drd.c:173: undefined reference to `cdns3_handshake'
>drivers/usb/cdns3/drd.o: In function `cdns3_drd_switch_host':
>drivers/usb/cdns3/drd.c:139: undefined reference to `cdns3_handshake'

I will check this. 
Thanks. 

>
>
>
>> diff --git a/drivers/usb/cdns3/cdns3-pci-wrap.c b/drivers/usb/cdns3/cdns3-pci-wrap.c
>> new file mode 100644
>> index 000000000000..d0b2d3d9b983
>> --- /dev/null
>> +++ b/drivers/usb/cdns3/cdns3-pci-wrap.c
>> @@ -0,0 +1,155 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * Cadence USBSS PCI Glue driver
>> + *
>> + * Copyright (C) 2018 Cadence.
>> + *
>> + * Author: Pawel Laszczak <pawell@...ence.com>
>> + */
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/pci.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/dma-mapping.h>
>> +#include <linux/slab.h>
>> +
>> +struct cdns3_wrap {
>> +	struct platform_device *plat_dev;
>> +	struct pci_dev *hg_dev;
>> +	struct resource dev_res[4];
>> +};
>> +
>> +struct cdns3_wrap wrap;
>not used in fact?

Yes, I forgot to remove it.  
>
>> +
>> +#define RES_IRQ_ID		0
>> +#define RES_HOST_ID		1
>> +#define RES_DEV_ID		2
>> +#define RES_DRD_ID		3
>> +
>> +#define PCI_BAR_HOST		0
>> +#define PCI_BAR_DEV		2
>> +#define PCI_BAR_OTG		4
>> +
>> +#define PCI_DEV_FN_HOST_DEVICE	0
>> +#define PCI_DEV_FN_OTG		1
>> +
>> +#define PCI_DRIVER_NAME		"cdns3-pci-usbss"
>> +#define PLAT_DRIVER_NAME	"cdns-usb3"
>> +
>> +#define CDNS_VENDOR_ID 0x17cd
>> +#define CDNS_DEVICE_ID 0x0100
>> +
>> +/**
>> + * cdns3_pci_probe - Probe function for Cadence USB wrapper driver
>> + * @pdev: platform device object
>> + * @id: pci device id
>> + *
>> + * Returns 0 on success otherwise negative errno
>> + */
>> +static int cdns3_pci_probe(struct pci_dev *pdev,
>> +			   const struct pci_device_id *id)
>> +{
>> +	struct platform_device_info plat_info;
>> +	struct cdns3_wrap *wrap;
>> +	struct resource *res;
>> +	int err;
>> +
>> +	/*
>> +	 * for GADGET/HOST PCI (devfn) function number is 0,
>> +	 * for OTG PCI (devfn) function number is 1
>> +	 */
>> +	if (!id || pdev->devfn != PCI_DEV_FN_HOST_DEVICE)
>> +		return -EINVAL;
>> +
>> +	err = pcim_enable_device(pdev);
>> +	if (err) {
>> +		dev_err(&pdev->dev, "Enabling PCI device has failed %d\n", err);
>> +		return err;
>> +	}
>> +
>> +	pci_set_master(pdev);
>> +	wrap = devm_kzalloc(&pdev->dev, sizeof(*wrap), GFP_KERNEL);
>> +	if (!wrap) {
>> +		dev_err(&pdev->dev, "Failed to allocate memory\n");
>> +		return -ENOMEM;
>> +	}
>> +
>> +	/* function 0: host(BAR_0) + device(BAR_1) + otg(BAR_2)). */
>> +	memset(wrap->dev_res, 0x00,
>> +	       sizeof(struct resource) * ARRAY_SIZE(wrap->dev_res));
>Mabye not necessary, devm_kzalloc() already set them as 0;

Yes, it's not necessary. 
>
>> +	dev_dbg(&pdev->dev, "Initialize Device resources\n");
>> +	res = wrap->dev_res;
>> +
>> +	res[RES_DEV_ID].start = pci_resource_start(pdev, PCI_BAR_DEV);
>> +	res[RES_DEV_ID].end =   pci_resource_end(pdev, PCI_BAR_DEV);
>> +	res[RES_DEV_ID].name = "dev";
>> +	res[RES_DEV_ID].flags = IORESOURCE_MEM;
>> +	dev_dbg(&pdev->dev, "USBSS-DEV physical base addr: %pa\n",
>> +		&res[RES_DEV_ID].start);
>> +
>> +	res[RES_HOST_ID].start = pci_resource_start(pdev, PCI_BAR_HOST);
>> +	res[RES_HOST_ID].end = pci_resource_end(pdev, PCI_BAR_HOST);
>> +	res[RES_HOST_ID].name = "xhci";
>> +	res[RES_HOST_ID].flags = IORESOURCE_MEM;
>> +	dev_dbg(&pdev->dev, "USBSS-XHCI physical base addr: %pa\n",
>> +		&res[RES_HOST_ID].start);
>> +
>> +	res[RES_DRD_ID].start = pci_resource_start(pdev, PCI_BAR_OTG);
>> +	res[RES_DRD_ID].end =   pci_resource_end(pdev, PCI_BAR_OTG);
>> +	res[RES_DRD_ID].name = "otg";
>> +	res[RES_DRD_ID].flags = IORESOURCE_MEM;
>> +	dev_dbg(&pdev->dev, "USBSS-DRD physical base addr: %pa\n",
>> +		&res[RES_DRD_ID].start);
>> +
>> +	/* Interrupt common for both device and XHCI */
>> +	wrap->dev_res[RES_IRQ_ID].start = pdev->irq;
>> +	wrap->dev_res[RES_IRQ_ID].name = "cdns3-irq";
>> +	wrap->dev_res[RES_IRQ_ID].flags = IORESOURCE_IRQ;
>> +
>> +	/* set up platform device info */
>> +	memset(&plat_info, 0, sizeof(plat_info));
>> +	plat_info.parent = &pdev->dev;
>> +	plat_info.fwnode = pdev->dev.fwnode;
>> +	plat_info.name = PLAT_DRIVER_NAME;
>> +	plat_info.id = pdev->devfn;
>> +	plat_info.res = wrap->dev_res;
>> +	plat_info.num_res = ARRAY_SIZE(wrap->dev_res);
>> +	plat_info.dma_mask = pdev->dma_mask;
>> +
>> +	/* register platform device */
>> +	wrap->plat_dev = platform_device_register_full(&plat_info);
>> +	if (IS_ERR(wrap->plat_dev))
>> +		return PTR_ERR(wrap->plat_dev);
>> +
>> +	pci_set_drvdata(pdev, wrap);
>> +
>> +	return err;
>> +}
>> +
>> +void cdns3_pci_remove(struct pci_dev *pdev)
>> +{
>> +	struct cdns3_wrap *wrap = (struct cdns3_wrap *)pci_get_drvdata(pdev);
>> +
>> +	platform_device_unregister(wrap->plat_dev);
>> +}
>> +
>> +static const struct pci_device_id cdns3_pci_ids[] = {
>> +	{ PCI_DEVICE(CDNS_VENDOR_ID, CDNS_DEVICE_ID), },
>> +	{ 0, }
>> +};
>> +
>> +static struct pci_driver cdns3_pci_driver = {
>> +	.name = PCI_DRIVER_NAME,
>> +	.id_table = cdns3_pci_ids,
>> +	.probe = cdns3_pci_probe,
>> +	.remove = cdns3_pci_remove,
>> +};
>> +
>> +module_pci_driver(cdns3_pci_driver);
>> +MODULE_DEVICE_TABLE(pci, cdns3_pci_ids);
>> +
>> +MODULE_AUTHOR("Pawel Laszczak <pawell@...ence.com>");
>> +MODULE_LICENSE("GPL v2");
>> +MODULE_DESCRIPTION("Cadence USBSS PCI wrapperr");
>> +
>> diff --git a/drivers/usb/cdns3/core.c b/drivers/usb/cdns3/core.c
>> new file mode 100644
>> index 000000000000..aa2f63241dab
>> --- /dev/null
>> +++ b/drivers/usb/cdns3/core.c
>> @@ -0,0 +1,403 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * Cadence USBSS DRD Driver.
>> + *
>> + * Copyright (C) 2018 Cadence.
>> + * Copyright (C) 2017-2018 NXP
>> + *
>> + * Author: Peter Chen <peter.chen@....com>
>> + *         Pawel Laszczak <pawell@...ence.com>
>> + */
>> +
>> +#include <linux/module.h>
>> +#include <linux/kernel.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/io.h>
>> +#include <linux/pm_runtime.h>
>> +
>> +#include "gadget.h"
>> +#include "core.h"
>> +#include "host-export.h"
>> +#include "gadget-export.h"
>> +#include "drd.h"
>> +#include "debug.h"
>> +
>> +static inline
>> +struct cdns3_role_driver *cdns3_get_current_role_driver(struct cdns3 *cdns)
>> +{
>> +	WARN_ON(cdns->role >= CDNS3_ROLE_END || !cdns->roles[cdns->role]);
>> +	return cdns->roles[cdns->role];
>> +}
>> +
>> +static int cdns3_role_start(struct cdns3 *cdns, enum cdns3_roles role)
>> +{
>> +	int ret;
>> +
>> +	if (WARN_ON(role >= CDNS3_ROLE_END))
>> +		return 0;
>> +
>> +	if (!cdns->roles[role])
>> +		return -ENXIO;
>> +
>> +	if (cdns->roles[role]->state == CDNS3_ROLE_STATE_ACTIVE)
>> +		return 0;
>> +
>> +	mutex_lock(&cdns->mutex);
>> +	cdns->role = role;
>> +	ret = cdns->roles[role]->start(cdns);
>> +	if (!ret)
>> +		cdns->roles[role]->state = CDNS3_ROLE_STATE_ACTIVE;
>> +	mutex_unlock(&cdns->mutex);
>> +	return ret;
>> +}
>> +
>> +void cdns3_role_stop(struct cdns3 *cdns)
>> +{
>> +	enum cdns3_roles role = cdns->role;
>> +
>> +	if (role >= CDNS3_ROLE_END) {
>> +		WARN_ON(role > CDNS3_ROLE_END);
>> +		return;
>> +	}
>> +
>> +	if (cdns->roles[role]->state == CDNS3_ROLE_STATE_INACTIVE)
>> +		return;
>> +
>> +	mutex_lock(&cdns->mutex);
>> +	cdns->roles[role]->stop(cdns);
>> +	cdns->roles[role]->state = CDNS3_ROLE_STATE_INACTIVE;
>> +	mutex_unlock(&cdns->mutex);
>> +}
>> +
>> +/*
>> + * cdns->role gets from cdns3_get_initial_role, and this API tells role at the
>> + * runtime.
>> + * If both roles are supported, the role is selected based on vbus/id.
>> + * It could be read from OTG register or external connector.
>> + * If only single role is supported, only one role structure
>> + * is allocated, cdns->roles[CDNS3_ROLE_HOST] or cdns->roles[CDNS3_ROLE_GADGET].
>> + */
>> +static enum cdns3_roles cdns3_get_initial_role(struct cdns3 *cdns)
>> +{
>> +	if (cdns->roles[CDNS3_ROLE_HOST] && cdns->roles[CDNS3_ROLE_GADGET]) {
>> +		if (cdns3_is_host(cdns))
>> +			return CDNS3_ROLE_HOST;
>> +		if (cdns3_is_device(cdns))
>> +			return CDNS3_ROLE_GADGET;
>> +	}
>> +	return cdns->roles[CDNS3_ROLE_HOST]
>> +		? CDNS3_ROLE_HOST
>> +		: CDNS3_ROLE_GADGET;
>> +}
>> +
>> +static void cdns3_exit_roles(struct cdns3 *cdns)
>> +{
>> +	cdns3_role_stop(cdns);
>> +	cdns3_drd_exit(cdns);
>> +}
>> +
>> +/**
>> + * cdns3_core_init_role - initialize role of operation
>> + * @cdns: Pointer to cdns3 structure
>> + *
>> + * Returns 0 on success otherwise negative errno
>> + */
>> +static int cdns3_core_init_role(struct cdns3 *cdns)
>> +{
>> +	struct device *dev = cdns->dev;
>> +	enum usb_dr_mode best_dr_mode;
>> +	enum usb_dr_mode dr_mode;
>> +	int ret = 0;
>> +
>> +	dr_mode = usb_get_dr_mode(dev);
>> +	cdns->role = CDNS3_ROLE_END;
>> +
>> +	/*
>> +	 * If driver can't read mode by means of usb_get_dr_mdoe function then
>> +	 * chooses mode according with Kernel configuration. This setting
>> +	 * can be restricted later depending on strap pin configuration.
>> +	 */
>> +	if (dr_mode == USB_DR_MODE_UNKNOWN) {
>> +		if (IS_ENABLED(CONFIG_USB_CDNS3_HOST) &&
>> +		    IS_ENABLED(CONFIG_USB_CDNS3_GADGET))
>> +			dr_mode = USB_DR_MODE_OTG;
>> +		else if (IS_ENABLED(CONFIG_USB_CDNS3_HOST))
>> +			dr_mode = USB_DR_MODE_HOST;
>> +		else if (IS_ENABLED(CONFIG_USB_CDNS3_GADGET))
>> +			dr_mode = USB_DR_MODE_PERIPHERAL;
>> +	}
>> +
>> +	best_dr_mode = USB_DR_MODE_OTG;
>> +
>> +	if (dr_mode == USB_DR_MODE_OTG) {
>> +		best_dr_mode = cdns->dr_mode;
>> +	} else if (cdns->dr_mode == USB_DR_MODE_OTG) {
>> +		best_dr_mode = dr_mode;
>> +	} else if (cdns->dr_mode != dr_mode) {
>> +		dev_err(dev, "Incorrect DRD configuration\n");
>> +		return -EINVAL;
>> +	}
>> +
>> +	dr_mode = best_dr_mode;
>> +
>> +	if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_HOST) {
>> +		ret = cdns3_host_init(cdns);
>> +		if (ret) {
>> +			dev_err(dev, "Host initialization failed with %d\n",
>> +				ret);
>> +			goto err;
>> +		}
>> +	}
>> +
>> +	if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_PERIPHERAL) {
>> +		ret = cdns3_gadget_init(cdns);
>> +		if (ret) {
>> +			dev_err(dev, "Device initialization failed with %d\n",
>> +				ret);
>> +			goto err;
>> +		}
>> +	}
>> +
>> +	cdns->desired_dr_mode = dr_mode;
>> +	cdns->dr_mode = dr_mode;
>> +	/*
>> +	 * dr_mode could be change so DRD must update controller
>> +	 * configuration
>> +	 */
>> +	ret = cdns3_drd_update_mode(cdns);
>> +	if (ret)
>> +		goto err;
>> +
>> +	cdns->role = cdns3_get_initial_role(cdns);
>> +
>> +	ret = cdns3_role_start(cdns, cdns->role);
>> +	if (ret) {
>> +		dev_err(dev, "can't start %s role\n",
>> +			cdns3_get_current_role_driver(cdns)->name);
>> +		goto err;
>> +	}
>> +
>> +	return ret;
>> +err:
>> +	cdns3_exit_roles(cdns);
>> +	return ret;
>> +}
>> +
>> +/**
>> + * cdsn3_get_real_role - get real role of controller based on hardware settings.
>> + * @cdns: Pointer to cdns3 structure
>> + *
>> + * Returns role
>> + */
>> +enum cdns3_roles cdsn3_get_real_role(struct cdns3 *cdns)
>> +{
>> +	enum cdns3_roles role = CDNS3_ROLE_END;
>> +
>> +	if (cdns->current_dr_mode == USB_DR_MODE_OTG) {
>> +		if (cdns3_get_id(cdns))
>> +			role = CDNS3_ROLE_GADGET;
>> +		else
>> +			role = CDNS3_ROLE_HOST;
>> +	} else {
>> +		if (cdns3_is_host(cdns))
>> +			role = CDNS3_ROLE_HOST;
>> +		if (cdns3_is_device(cdns))
>> +			role = CDNS3_ROLE_GADGET;
>> +	}
>> +
>> +	return role;
>> +}
>> +
>> +/**
>> + * cdns3_role_switch - work queue handler for role switch
>> + *
>> + * @work: work queue item structure
>> + *
>> + * Handles below events:
>> + * - Role switch for dual-role devices
>> + * - CDNS3_ROLE_GADGET <--> CDNS3_ROLE_END for peripheral-only devices
>> + */
>> +static void cdns3_role_switch(struct work_struct *work)
>> +{
>> +	enum cdns3_roles role = CDNS3_ROLE_END;
>> +	struct cdns3_role_driver *role_drv;
>> +	enum cdns3_roles current_role;
>> +	struct cdns3 *cdns;
>> +	int ret = 0;
>> +
>> +	cdns = container_of(work, struct cdns3, role_switch_wq);
>> +
>> +	/* During switching cdns->role can be different then role */
>> +	role = cdsn3_get_real_role(cdns);
>> +
>> +	role_drv = cdns3_get_current_role_driver(cdns);
>> +
>> +	pm_runtime_get_sync(cdns->dev);
>> +
>> +	/* Disable current role. This state can be forced from user space. */
>> +	if (cdns->debug_disable && role_drv->state == CDNS3_ROLE_STATE_ACTIVE) {
>> +		cdns3_role_stop(cdns);
>> +		goto exit;
>> +	}
>> +
>> +	/* Do nothing if nothing changed */
>> +	if (cdns->role == role && role_drv->state == CDNS3_ROLE_STATE_ACTIVE)
>> +		goto exit;
>> +
>> +	cdns3_role_stop(cdns);
>> +
>> +	role = cdsn3_get_real_role(cdns);
>> +
>> +	current_role = cdns->role;
>> +	dev_dbg(cdns->dev, "Switching role");
>> +
>> +	ret = cdns3_role_start(cdns, role);
>> +	if (ret) {
>> +		/* Back to current role */
>> +		dev_err(cdns->dev, "set %d has failed, back to %d\n",
>> +			role, current_role);
>> +		cdns3_role_start(cdns, current_role);
>> +	}
>> +exit:
>> +	pm_runtime_put_sync(cdns->dev);
>> +}
>> +
>> +/**
>> + * cdns3_probe - probe for cdns3 core device
>> + * @pdev: Pointer to cdns3 core platform device
>> + *
>> + * Returns 0 on success otherwise negative errno
>> + */
>> +static int cdns3_probe(struct platform_device *pdev)
>> +{
>> +	struct device *dev = &pdev->dev;
>> +	struct resource	*res;
>> +	struct cdns3 *cdns;
>> +	void __iomem *regs;
>> +	int ret;
>> +
>> +	cdns = devm_kzalloc(dev, sizeof(*cdns), GFP_KERNEL);
>> +	if (!cdns)
>> +		return -ENOMEM;
>> +
>> +	cdns->dev = dev;
>> +
>> +	platform_set_drvdata(pdev, cdns);
>> +
>> +	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
>> +	if (!res) {
>> +		dev_err(dev, "missing IRQ\n");
>> +		return -ENODEV;
>> +	}
>> +	cdns->irq = res->start;
>> +
>> +	cdns->xhci_res[0] = *res;
>> +
>> +	/*
>> +	 * Request memory region
>> +	 * region-0: xHCI
>> +	 * region-1: Peripheral
>> +	 * region-2: OTG registers
>> +	 */
>the comment should be modified or removed if not necessary when codes
>changed.

Yes, now it's not necessary. 

>> +	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "xhci");
>> +	if (!res)
>> +		return -ENXIO;
>> +
>> +	cdns->xhci_res[1] = *res;
>> +
>> +	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dev");
>> +	regs = devm_ioremap_resource(dev, res);
>> +	if (IS_ERR(regs))
>> +		return PTR_ERR(regs);
>> +	cdns->dev_regs	= regs;
>> +
>> +	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "otg");
>> +	if (!res)
>> +		return -ENXIO;
>> +
>> +	cdns->otg_res = *res;
>> +
>> +	mutex_init(&cdns->mutex);
>> +
>> +	cdns->phy = devm_phy_optional_get(dev, "cdns3,usbphy");
>> +	if (IS_ERR(cdns->phy))
>> +		return PTR_ERR(cdns->phy);
>> +
>> +	phy_init(cdns->phy);
>check the return value? and
>It's better to call phy_power_on() here even if the phy driver doesn't
>provide power_on()

Driver doesn't need to check return value in this case. It was discussed some time ago. 

>
>> +
>> +	INIT_WORK(&cdns->role_switch_wq, cdns3_role_switch);
>> +
>> +	ret = cdns3_drd_init(cdns);
>> +	if (ret)
>> +		goto err;
>> +
>> +	ret = cdns3_core_init_role(cdns);
>> +	if (ret)
>> +		goto err;
>> +
>> +	cdns3_debugfs_init(cdns);
>> +	device_set_wakeup_capable(dev, true);
>> +	pm_runtime_set_active(dev);
>> +	pm_runtime_enable(dev);
>> +
>> +	/*
>> +	 * The controller needs less time between bus and controller suspend,
>> +	 * and we also needs a small delay to avoid frequently entering low
>> +	 * power mode.
>> +	 */
>> +	pm_runtime_set_autosuspend_delay(dev, 20);
>> +	pm_runtime_mark_last_busy(dev);
>> +	pm_runtime_use_autosuspend(dev);
>> +	dev_dbg(dev, "Cadence USB3 core: probe succeed\n");
>> +
>> +	return 0;
>> +
>> +err:
>> +	phy_exit(cdns->phy);
>> +	return ret;
>> +}
>> +
>> +/**
>> + * cdns3_remove - unbind drd driver and clean up
>> + * @pdev: Pointer to Linux platform device
>> + *
>> + * Returns 0 on success otherwise negative errno
>> + */
>> +static int cdns3_remove(struct platform_device *pdev)
>> +{
>> +	struct cdns3 *cdns = platform_get_drvdata(pdev);
>> +
>> +	pm_runtime_get_sync(&pdev->dev);
>> +	pm_runtime_disable(&pdev->dev);
>> +	pm_runtime_put_noidle(&pdev->dev);
>> +	cdns3_debugfs_exit(cdns);
>> +	cdns3_exit_roles(cdns);
>> +	phy_exit(cdns->phy);
>> +	return 0;
>> +}
>> +
>> +#ifdef CONFIG_OF
>> +static const struct of_device_id of_cdns3_match[] = {
>> +	{ .compatible = "cdns,usb3-1.0.0" },
>> +	{ .compatible = "cdns,usb3-1.0.1" },
>> +	{ },
>> +};
>> +MODULE_DEVICE_TABLE(of, of_cdns3_match);
>> +#endif
>> +
>> +static struct platform_driver cdns3_driver = {
>> +	.probe		= cdns3_probe,
>> +	.remove		= cdns3_remove,
>> +	.driver		= {
>> +		.name	= "cdns-usb3",
>> +		.of_match_table	= of_match_ptr(of_cdns3_match),
>> +	},
>> +};
>> +
>> +module_platform_driver(cdns3_driver);
>> +
>> +MODULE_ALIAS("platform:cdns3");
>> +MODULE_AUTHOR("Pawel Laszczak <pawell@...ence.com>");
>> +MODULE_LICENSE("GPL v2");
>> +MODULE_DESCRIPTION("Cadence USB3 DRD Controller Driver");
>> diff --git a/drivers/usb/cdns3/core.h b/drivers/usb/cdns3/core.h
>> new file mode 100644
>> index 000000000000..fb4b39206158
>> --- /dev/null
>> +++ b/drivers/usb/cdns3/core.h
>> @@ -0,0 +1,116 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +/*
>> + * Cadence USBSS DRD Header File.
>> + *
>> + * Copyright (C) 2017-2018 NXP
>> + * Copyright (C) 2018 Cadence.
>> + *
>> + * Authors: Peter Chen <peter.chen@....com>
>> + *          Pawel Laszczak <pawell@...ence.com>
>> + */
>> +#include <linux/usb/otg.h>
>> +
>> +#ifndef __LINUX_CDNS3_CORE_H
>> +#define __LINUX_CDNS3_CORE_H
>> +
>> +struct cdns3;
>> +enum cdns3_roles {
>> +	CDNS3_ROLE_HOST = 0,
>> +	CDNS3_ROLE_GADGET,
>> +	CDNS3_ROLE_END,
>> +};
>> +
>> +/**
>> + * struct cdns3_role_driver - host/gadget role driver
>> + * @start: start this role
>> + * @stop: stop this role
>> + * @suspend: suspend callback for this role
>> + * @resume: resume callback for this role
>> + * @irq: irq handler for this role
>no irq member,
>> + * @name: role name string (host/gadget)
>> + * @state: current state
>> + */
>> +struct cdns3_role_driver {
>> +	int (*start)(struct cdns3 *cdns);
>> +	void (*stop)(struct cdns3 *cdns);
>> +	int (*suspend)(struct cdns3 *cdns, bool do_wakeup);
>> +	int (*resume)(struct cdns3 *cdns, bool hibernated);
>> +	const char *name;
>> +#define CDNS3_ROLE_STATE_INACTIVE	0
>> +#define CDNS3_ROLE_STATE_ACTIVE		1
>> +	int state;
>> +};
>> +
>> +#define CDNS3_XHCI_RESOURCES_NUM	2
>> +/**
>> + * struct cdns3 - Representation of Cadence USB3 DRD controller.
>> + * @dev: pointer to Cadence device struct
>> + * @xhci_regs: pointer to base of xhci registers
>> + * @xhci_res: the resource for xhci
>> + * @dev_regs: pointer to base of dev registers
>> + * @otg_regs: pointer to base of otg registers
>not pointer

Why ? 
struct cdns3_otg_common_regs	*otg_regs;

But I forgot:
 * @otg_res: the resource for otg
 * @otg_v0_regs: pointer to base of v0 otg registers
 * @otg_v1_regs: pointer to base of v1 otg registers

>> + * @irq: irq number for controller
>> + * @roles: array of supported roles for this controller
>> + * @role: current role
>> + * @host_dev: the child host device pointer for cdns3 core
>> + * @gadget_dev: the child gadget device pointer for cdns3 core
>> + * @usb: phy for this controller
>> + * @role_switch_wq: work queue item for role switch
>> + * @in_lpm: the controller in low power mode
>> + * @wakeup_int: the wakeup interrupt
>> + * @mutex: the mutex for concurrent code at driver
>> + * @dr_mode: supported mode of operation it can be only Host, only Device
>> + *           or OTG mode that allow to switch between Device and Host mode.
>> + *           This field based on firmware setting, kernel configuration
>> + *           and hardware configuration.
>> + * @current_dr_mode: current mode of operation when in dual-role mode
>> + * @desired_dr_mode: desired mode of operation when in dual-role mode.
>> + *           This value can be changed during runtime.
>> + *           Available options depends on  dr_mode:
>> + *           dr_mode                 |  desired_dr_mode and current_dr_mode
>> + *           ----------------------------------------------------------------
>> + *           USB_DR_MODE_HOST        | only USB_DR_MODE_HOST
>> + *           USB_DR_MODE_PERIPHERAL  | only USB_DR_MODE_PERIPHERAL
>> + *           USB_DR_MODE_OTG         | only USB_DR_MODE_HOST
>> + *           USB_DR_MODE_OTG         | only USB_DR_MODE_PERIPHERAL
>> + *           USB_DR_MODE_OTG         | USB_DR_MODE_OTG
>> + *
>> + *           Desired_dr_role can be changed by means of debugfs.
>> + * @root: debugfs root folder pointer
>> + * @debug_disable:
>> + */
>> +struct cdns3 {
>> +	struct device			*dev;
>> +	void __iomem			*xhci_regs;
>> +	struct resource			xhci_res[CDNS3_XHCI_RESOURCES_NUM];
>> +	struct cdns3_usb_regs __iomem	*dev_regs;
>> +
>> +	struct resource			otg_res;
>> +	struct cdns3_otg_legacy_regs	*otg_v0_regs;
>> +	struct cdns3_otg_regs		*otg_v1_regs;
>> +	struct cdns3_otg_common_regs	*otg_regs;
>> +#define CDNS3_CONTROLLER_V0	0
>> +#define CDNS3_CONTROLLER_V1	1
>> +	u32				version;
>> +
>> +	int				irq;
>> +	struct cdns3_role_driver	*roles[CDNS3_ROLE_END];
>> +	enum cdns3_roles		role;
>> +	struct platform_device		*host_dev;
>> +	struct cdns3_device		*gadget_dev;
>> +	struct phy			*phy;
>Does the single phy support both HS and SS?
>> +	struct work_struct		role_switch_wq;
>> +	int				in_lpm:1;
>> +	int				wakeup_int:1;
>> +	/* mutext used in workqueue*/
>> +	struct mutex			mutex;
>> +	enum usb_dr_mode		dr_mode;
>> +	enum usb_dr_mode		current_dr_mode;
>> +	enum usb_dr_mode		desired_dr_mode;
>> +	struct dentry			*root;
>> +	int				debug_disable:1;
>> +};
>> +
>> +void cdns3_role_stop(struct cdns3 *cdns);
>> +
>> +#endif /* __LINUX_CDNS3_CORE_H */
>> diff --git a/drivers/usb/cdns3/debug.h b/drivers/usb/cdns3/debug.h
>> new file mode 100644
>> index 000000000000..1929edb3a521
>> --- /dev/null
>> +++ b/drivers/usb/cdns3/debug.h
>> @@ -0,0 +1,168 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +/*
>> + * Cadence USBSS DRD Driver.
>> + * Debug header file.
>> + *
>> + * Copyright (C) 2018 Cadence.
>> + *
>> + * Author: Pawel Laszczak <pawell@...ence.com>
>> + */
>> +#ifndef __LINUX_CDNS3_DEBUG
>> +#define __LINUX_CDNS3_DEBUG
>> +
>> +#include "core.h"
>> +
>> +static inline char *cdns3_decode_usb_irq(char *str,
>> +					 enum usb_device_speed speed,
>> +					 u32 usb_ists)
>> +{
>> +	int ret;
>> +
>> +	ret = sprintf(str, "IRQ %08x = ", usb_ists);
>> +
>> +	if (usb_ists & (USB_ISTS_CON2I | USB_ISTS_CONI)) {
>> +		ret += sprintf(str + ret, "Connection %s\n",
>> +			       usb_speed_string(speed));
>> +	}
>> +	if (usb_ists & USB_ISTS_CON2I || usb_ists & USB_ISTS_CONI)
>> +		ret += sprintf(str + ret, "Disconnection ");
>> +	if (usb_ists & USB_ISTS_L2ENTI)
>> +		ret += sprintf(str + ret, "suspended ");
>> +
>> +	if (usb_ists & USB_ISTS_L2EXTI)
>> +		ret += sprintf(str + ret, "L2 exit ");
>> +	if (usb_ists & USB_ISTS_U3EXTI)
>> +		ret += sprintf(str + ret, "U3 exit ");
>> +	if (usb_ists & USB_ISTS_UWRESI)
>> +		ret += sprintf(str + ret, "Warm Reset ");
>> +	if (usb_ists & USB_ISTS_UHRESI)
>> +		ret += sprintf(str + ret, "Hot Reset ");
>> +	if (usb_ists & USB_ISTS_U2RESI)
>> +		ret += sprintf(str + ret, "Reset");
>> +
>> +	return str;
>> +}
>> +
>> +static inline  char *cdns3_decode_ep_irq(char *str,
>> +					 u32 ep_sts,
>> +					 const char *ep_name)
>> +{
>> +	int ret;
>> +
>> +	ret = sprintf(str, "IRQ for %s: %08x ", ep_name, ep_sts);
>> +
>> +	if (ep_sts & EP_STS_SETUP)
>> +		ret += sprintf(str + ret, "SETUP ");
>> +	if (ep_sts & EP_STS_IOC)
>> +		ret += sprintf(str + ret, "IOC ");
>> +	if (ep_sts & EP_STS_ISP)
>> +		ret += sprintf(str + ret, "ISP ");
>> +	if (ep_sts & EP_STS_DESCMIS)
>> +		ret += sprintf(str + ret, "DESCMIS ");
>> +	if (ep_sts & EP_STS_STREAMR)
>> +		ret += sprintf(str + ret, "STREAMR ");
>> +	if (ep_sts & EP_STS_MD_EXIT)
>> +		ret += sprintf(str + ret, "MD_EXIT ");
>> +	if (ep_sts & EP_STS_TRBERR)
>> +		ret += sprintf(str + ret, "TRBERR ");
>> +	if (ep_sts & EP_STS_NRDY)
>> +		ret += sprintf(str + ret, "NRDY ");
>> +	if (ep_sts & EP_STS_PRIME)
>> +		ret += sprintf(str + ret, "PRIME ");
>> +	if (ep_sts & EP_STS_SIDERR)
>> +		ret += sprintf(str + ret, "SIDERRT ");
>> +	if (ep_sts & EP_STS_OUTSMM)
>> +		ret += sprintf(str + ret, "OUTSMM ");
>> +	if (ep_sts & EP_STS_ISOERR)
>> +		ret += sprintf(str + ret, "ISOERR ");
>> +	if (ep_sts & EP_STS_IOT)
>> +		ret += sprintf(str + ret, "IOT ");
>> +
>> +	return str;
>> +}
>> +
>> +static inline char *cdns3_decode_epx_irq(char *str,
>> +					 char *ep_name,
>> +					 u32 ep_sts)
>> +{
>> +	return cdns3_decode_ep_irq(str, ep_sts, ep_name);
>> +}
>> +
>> +static inline char *cdns3_decode_ep0_irq(char *str,
>> +					 int dir,
>> +					 u32 ep_sts)
>> +{
>> +	return cdns3_decode_ep_irq(str, ep_sts,
>> +				   dir ? "ep0IN" : "ep0OUT");
>> +}
>> +
>> +/**
>> + * Debug a transfer ring.
>> + *
>> + * Prints out all TRBs in the endpoint ring, even those after the Link TRB.
>> + *.
>> + */
>> +static inline char *cdns3_dbg_ring(struct cdns3_endpoint *priv_ep,
>> +				   struct cdns3_trb *ring, char *str)
>> +{
>> +	dma_addr_t addr = priv_ep->trb_pool_dma;
>> +	struct cdns3_trb *trb;
>> +	int trb_per_sector;
>> +	int ret = 0;
>> +	int i;
>> +
>> +	trb_per_sector = GET_TRBS_PER_SEGMENT(priv_ep->type);
>> +
>> +	trb = &priv_ep->trb_pool[priv_ep->dequeue];
>> +	ret += sprintf(str + ret, "\n\t\tRing contents for %s:", priv_ep->name);
>> +
>> +	ret += sprintf(str + ret,
>> +		       "\n\t\tRing deq index: %d, trb: %p (virt), 0x%llx (dma)\n",
>> +		       priv_ep->dequeue, trb,
>> +		       (unsigned long long)cdns3_trb_virt_to_dma(priv_ep, trb));
>> +
>> +	trb = &priv_ep->trb_pool[priv_ep->enqueue];
>> +	ret += sprintf(str + ret,
>> +		       "\t\tRing enq index: %d, trb: %p (virt), 0x%llx (dma)\n",
>> +		       priv_ep->enqueue, trb,
>> +		       (unsigned long long)cdns3_trb_virt_to_dma(priv_ep, trb));
>> +
>> +	ret += sprintf(str + ret,
>> +		       "\t\tfree trbs: %d, CCS=%d, PCS=%d\n",
>> +		       priv_ep->free_trbs, priv_ep->ccs, priv_ep->pcs);
>> +
>> +	if (trb_per_sector > TRBS_PER_SEGMENT)
>> +		trb_per_sector = TRBS_PER_SEGMENT;
>> +
>> +	if (trb_per_sector > TRBS_PER_SEGMENT) {
>> +		sprintf(str + ret, "\t\tTo big transfer ring %d\n",
>> +			trb_per_sector);
>> +		return str;
>> +	}
>> +
>> +	for (i = 0; i < trb_per_sector; ++i) {
>> +		trb = &ring[i];
>> +		ret += sprintf(str + ret,
>> +			"\t\t@...d %08x %08x %08x\n", &addr,
>> +			le32_to_cpu(trb->buffer),
>> +			le32_to_cpu(trb->length),
>> +			le32_to_cpu(trb->control));
>> +		addr += sizeof(*trb);
>> +	}
>> +
>> +	return str;
>> +}
>> +
>> +void cdns3_dbg(struct cdns3_device *priv_dev, const char *fmt, ...);
>> +
>> +#ifdef CONFIG_DEBUG_FS
>> +void cdns3_debugfs_init(struct cdns3 *cdns);
>> +void cdns3_debugfs_exit(struct cdns3 *cdns);
>> +#else
>> +void cdns3_debugfs_init(struct cdns3 *cdns);
>> +{  }
>> +void cdns3_debugfs_exit(struct cdns3 *cdns);
>> +{  }
>> +#endif
>> +
>> +#endif /*__LINUX_CDNS3_DEBUG*/
>> diff --git a/drivers/usb/cdns3/debugfs.c b/drivers/usb/cdns3/debugfs.c
>> new file mode 100644
>> index 000000000000..d8fcd90d05b3
>> --- /dev/null
>> +++ b/drivers/usb/cdns3/debugfs.c
>> @@ -0,0 +1,164 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * Cadence USBSS DRD Controller DebugFS filer.
>> + *
>> + * Copyright (C) 2018 Cadence.
>> + *
>> + * Author: Pawel Laszczak <pawell@...ence.com>
>> + */
>> +
>> +#include <linux/types.h>
>> +#include <linux/debugfs.h>
>> +#include <linux/seq_file.h>
>> +#include <linux/uaccess.h>
>> +
>> +#include "core.h"
>> +#include "gadget.h"
>> +#include "drd.h"
>> +
>> +static int cdns3_mode_show(struct seq_file *s, void *unused)
>> +{
>> +	struct cdns3 *cdns = s->private;
>> +
>> +	switch (cdns->current_dr_mode) {
>> +	case USB_DR_MODE_HOST:
>> +		seq_puts(s, "host\n");
>> +		break;
>> +	case USB_DR_MODE_PERIPHERAL:
>> +		seq_puts(s, "device\n");
>> +		break;
>> +	case USB_DR_MODE_OTG:
>> +		seq_puts(s, "otg\n");
>> +		break;
>> +	default:
>> +		seq_puts(s, "UNKNOWN mode\n");
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static int cdns3_mode_open(struct inode *inode, struct file *file)
>> +{
>> +	return single_open(file, cdns3_mode_show, inode->i_private);
>> +}
>> +
>> +static ssize_t cdns3_mode_write(struct file *file,
>> +				const char __user *ubuf,
>> +				size_t count, loff_t *ppos)
>> +{
>> +	struct seq_file	 *s = file->private_data;
>> +	struct cdns3 *cdns = s->private;
>> +	u32 mode = USB_DR_MODE_UNKNOWN;
>> +	char buf[32];
>> +
>> +	if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
>> +		return -EFAULT;
>> +
>> +	if (!strncmp(buf, "host", 4)) {
>> +		if (cdns->dr_mode == USB_DR_MODE_HOST ||
>> +		    cdns->dr_mode == USB_DR_MODE_OTG) {
>> +			mode = USB_DR_MODE_HOST;
>> +		}
>> +	}
>> +
>> +	if (!strncmp(buf, "device", 6))
>> +		if (cdns->dr_mode == USB_DR_MODE_PERIPHERAL ||
>> +		    cdns->dr_mode == USB_DR_MODE_OTG)
>> +			mode = USB_DR_MODE_PERIPHERAL;
>> +
>> +	if (!strncmp(buf, "otg", 3) && cdns->dr_mode == USB_DR_MODE_OTG)
>> +		mode = USB_DR_MODE_OTG;
>> +
>> +	if (mode == USB_DR_MODE_UNKNOWN) {
>> +		dev_err(cdns->dev, "Failed: incorrect mode setting\n");
>> +		return -EFAULT;
>> +	}
>> +
>> +	if (cdns->current_dr_mode != mode) {
>> +		cdns->desired_dr_mode = mode;
>> +		cdns->debug_disable = 0;
>> +		cdns3_role_stop(cdns);
>> +		cdns3_drd_update_mode(cdns);
>> +		queue_work(system_freezable_wq, &cdns->role_switch_wq);
>> +	}
>> +
>> +	return count;
>> +}
>> +
>> +static const struct file_operations cdns3_mode_fops = {
>> +	.open			= cdns3_mode_open,
>> +	.write			= cdns3_mode_write,
>> +	.read			= seq_read,
>> +	.llseek			= seq_lseek,
>> +	.release		= single_release,
>> +};
>> +
>> +static int cdns3_disable_show(struct seq_file *s, void *unused)
>> +{
>> +	struct cdns3 *cdns = s->private;
>> +
>> +	if (!cdns->debug_disable)
>> +		seq_puts(s, "0\n");
>> +	else
>> +		seq_puts(s, "1\n");
>> +
>> +	return 0;
>> +}
>> +
>> +static ssize_t cdns3_disable_write(struct file *file,
>> +				   const char __user *ubuf,
>> +				   size_t count, loff_t *ppos)
>> +{
>> +	struct seq_file	 *s = file->private_data;
>> +	struct cdns3 *cdns = s->private;
>> +	bool disable;
>> +	char buf[16];
>> +
>> +	if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
>> +		return -EFAULT;
>> +
>> +	if (kstrtobool(buf, &disable)) {
>> +		dev_err(cdns->dev, "wrong setting\n");
>> +		return -EINVAL;
>> +	}
>> +
>> +	if (disable != cdns->debug_disable) {
>> +		cdns->debug_disable = disable;
>> +		queue_work(system_freezable_wq, &cdns->role_switch_wq);
>> +	}
>> +
>> +	return count;
>> +}
>> +
>> +static int cdns3_disable_open(struct inode *inode, struct file *file)
>> +{
>> +	return single_open(file, cdns3_disable_show, inode->i_private);
>> +}
>> +
>> +static const struct file_operations cdns3_disable_fops = {
>> +	.open			= cdns3_disable_open,
>> +	.write			= cdns3_disable_write,
>> +	.read			= seq_read,
>> +	.llseek			= seq_lseek,
>> +	.release		= single_release,
>> +};
>> +
>> +void cdns3_debugfs_init(struct cdns3 *cdns)
>> +{
>> +	struct dentry *root;
>> +
>> +	root = debugfs_create_dir(dev_name(cdns->dev), NULL);
>> +	cdns->root = root;
>> +	if (IS_ENABLED(CONFIG_USB_CDNS3_GADGET) &&
>> +	    IS_ENABLED(CONFIG_USB_CDNS3_HOST))
>> +		debugfs_create_file("mode", 0644, root, cdns,
>> +				    &cdns3_mode_fops);
>> +
>> +	debugfs_create_file("disable", 0644, root, cdns,
>> +			    &cdns3_disable_fops);
>> +}
>> +
>> +void cdns3_debugfs_exit(struct cdns3 *cdns)
>> +{
>> +	debugfs_remove_recursive(cdns->root);
>> +}
>> diff --git a/drivers/usb/cdns3/drd.c b/drivers/usb/cdns3/drd.c
>> new file mode 100644
>> index 000000000000..3e56338cd7b9
>> --- /dev/null
>> +++ b/drivers/usb/cdns3/drd.c
>> @@ -0,0 +1,365 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * Cadence USBSS DRD Driver.
>> + *
>> + * Copyright (C) 2018 Cadence.
>> + *
>> + * Author: Pawel Laszczak <pawell@...ence.com
>> + *
>> + */
>> +#include <linux/kernel.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/delay.h>
>> +#include <linux/usb/otg.h>
>> +
>> +#include "gadget.h"
>> +#include "drd.h"
>> +#include "core.h"
>> +
>> +static int cdns3_drd_switch_gadget(struct cdns3 *cdns, int on);
>> +static int cdns3_drd_switch_host(struct cdns3 *cdns, int on);
>> +
>> +/**
>> + * cdns3_set_mode - change mode of OTG Core
>> + * @cdns: pointer to context structure
>> + * @mode: selected mode from cdns_role
>> + *
>> + * Returns 0 on success otherwise negative errno
>> + */
>> +int cdns3_set_mode(struct cdns3 *cdns, enum usb_dr_mode mode)
>> +{
>> +	int ret = 0;
>> +	u32 reg;
>> +
>> +	cdns->current_dr_mode = mode;
>> +
>> +	switch (mode) {
>> +	case USB_DR_MODE_PERIPHERAL:
>> +		dev_info(cdns->dev, "Set controller to Gadget mode\n");
>> +		ret = cdns3_drd_switch_gadget(cdns, 1);
>> +		break;
>> +	case USB_DR_MODE_HOST:
>> +		dev_info(cdns->dev, "Set controller to Host mode\n");
>> +		ret = cdns3_drd_switch_host(cdns, 1);
>> +		break;
>> +	case USB_DR_MODE_OTG:
>> +		dev_info(cdns->dev, "Set controller to OTG mode\n");
>> +		if (cdns->version == CDNS3_CONTROLLER_V1) {
>> +			reg = readl(&cdns->otg_v1_regs->override);
>> +			reg |= OVERRIDE_IDPULLUP;
>> +			writel(reg, &cdns->otg_v1_regs->override);
>> +		} else {
>> +			reg = readl(&cdns->otg_v0_regs->ctrl1);
>> +			reg |= OVERRIDE_IDPULLUP_V0;
>> +			writel(reg, &cdns->otg_v0_regs->ctrl1);
>> +		}
>> +
>> +		/*
>> +		 * Hardware specification says: "ID_VALUE must be valid within
>> +		 * 50ms after idpullup is set to '1" so driver must wait
>> +		 * 50ms before reading this pin.
>> +		 */
>> +		usleep_range(50000, 60000);
>> +		break;
>> +	default:
>> +		cdns->current_dr_mode = USB_DR_MODE_UNKNOWN;
>> +		dev_err(cdns->dev, "Unsupported mode of operation %d\n", mode);
>> +		return -EINVAL;
>> +	}
>> +
>> +	return ret;
>> +}
>> +
>> +int cdns3_get_id(struct cdns3 *cdns)
>> +{
>> +	int id;
>> +
>> +	id = readl(&cdns->otg_regs->sts) & OTGSTS_ID_VALUE;
>> +	dev_dbg(cdns->dev, "OTG ID: %d", id);
>> +	return id;
>> +}
>> +
>> +int cdns3_is_host(struct cdns3 *cdns)
>maybe it's better to use bool instead of int
>> +{
>> +	if (cdns->current_dr_mode == USB_DR_MODE_HOST)
>> +		return 1;
>> +	else if (!cdns3_get_id(cdns))
>> +		return 1;
>> +
>> +	return 0;
>> +}
>> +
>> +int cdns3_is_device(struct cdns3 *cdns)
>ditto
>> +{
>> +	if (cdns->current_dr_mode == USB_DR_MODE_PERIPHERAL)
>> +		return 1;
>> +	else if (cdns->current_dr_mode == USB_DR_MODE_OTG)
>> +		if (cdns3_get_id(cdns))
>> +			return 1;
>> +
>> +	return 0;
>> +}
>> +
>> +/**
>> + * cdns3_otg_disable_irq - Disable all OTG interrupts
>> + * @cdns: Pointer to controller context structure
>> + */
>> +static void cdns3_otg_disable_irq(struct cdns3 *cdns)
>> +{
>> +	writel(0, &cdns->otg_regs->ien);
>> +}
>> +
>> +/**
>> + * cdns3_otg_enable_irq - enable id and sess_valid interrupts
>> + * @cdns: Pointer to controller context structure
>> + */
>> +static void cdns3_otg_enable_irq(struct cdns3 *cdns)
>> +{
>> +	writel(OTGIEN_ID_CHANGE_INT | OTGIEN_VBUSVALID_RISE_INT |
>> +	       OTGIEN_VBUSVALID_FALL_INT, &cdns->otg_regs->ien);
>> +}
>> +
>> +/**
>> + * cdns3_drd_switch_host - start/stop host
>> + * @cdns: Pointer to controller context structure
>> + * @on: 1 for start, 0 for stop
>> + *
>> + * Returns 0 on success otherwise negative errno
>> + */
>[...]
>> +DEFINE_EVENT(cdns3_log_request_handled, cdns3_request_handled,
>> +	TP_PROTO(struct cdns3_request *priv_req, int current_index,
>> +		 int handled),
>> +	TP_ARGS(priv_req, current_index, handled)
>> +);
>> +#endif /* __LINUX_CDNS3_TRACE */
>> +
>> +/* this part must be outside header guard */
>> +
>> +#undef TRACE_INCLUDE_PATH
>> +#define TRACE_INCLUDE_PATH .
>> +
>> +#undef TRACE_INCLUDE_FILE
>> +#define TRACE_INCLUDE_FILE trace
>> +
>> +#include <trace/define_trace.h>
>
Thanks, 
Pawel

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