[U-Boot,3/6] usb: dwc3: Add generic DWC3 glue logic driver

Message ID c69544deff22b3ba2575feb3d7fb414f3586e624.1526480763.git.michal.simek@xilinx.com
State Superseded
Delegated to: Marek Vasut
Headers show
Series
  • Convert Xilinx ZynqMP to DM_USB with generic DWC3 glue logic driver
Related show

Commit Message

Michal Simek May 16, 2018, 2:26 p.m.
By enabling BLK by default this is the next driver which needs to get
support for DM_USB. Adding generic DWC3 glue logic which only
parse nodes and read device mode. Based on it probe proper
host/peripheral DWC3 drivers for it.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
---

 drivers/usb/dwc3/Kconfig        |   6 ++
 drivers/usb/dwc3/Makefile       |   1 +
 drivers/usb/dwc3/dwc3-generic.c | 165 ++++++++++++++++++++++++++++++++
 3 files changed, 172 insertions(+)
 create mode 100644 drivers/usb/dwc3/dwc3-generic.c

Comments

Marek Vasut May 16, 2018, 2:41 p.m. | #1
On 05/16/2018 04:26 PM, Michal Simek wrote:
> By enabling BLK by default this is the next driver which needs to get
> support for DM_USB. Adding generic DWC3 glue logic which only
> parse nodes and read device mode. Based on it probe proper
> host/peripheral DWC3 drivers for it.
> 
> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
> ---
> 
>  drivers/usb/dwc3/Kconfig        |   6 ++
>  drivers/usb/dwc3/Makefile       |   1 +
>  drivers/usb/dwc3/dwc3-generic.c | 165 ++++++++++++++++++++++++++++++++
>  3 files changed, 172 insertions(+)
>  create mode 100644 drivers/usb/dwc3/dwc3-generic.c
> 
> diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig
> index ae7fc1c6304d..943b7630eba4 100644
> --- a/drivers/usb/dwc3/Kconfig
> +++ b/drivers/usb/dwc3/Kconfig
> @@ -37,6 +37,12 @@ config USB_DWC3_OMAP
>  
>  	  Say 'Y' here if you have one such device
>  
> +config USB_DWC3_GENERIC
> +	bool "Xilinx ZynqMP and similar Platforms"
> +	depends on DM_USB && USB_DWC3
> +	help
> +	  Some platforms can reuse this DWC3 generic implementation.
> +
>  config USB_DWC3_UNIPHIER
>  	bool "DesignWare USB3 Host Support on UniPhier Platforms"
>  	depends on ARCH_UNIPHIER && USB_XHCI_DWC3
> diff --git a/drivers/usb/dwc3/Makefile b/drivers/usb/dwc3/Makefile
> index cd18b8d9ec02..60b5515a67da 100644
> --- a/drivers/usb/dwc3/Makefile
> +++ b/drivers/usb/dwc3/Makefile
> @@ -7,6 +7,7 @@ dwc3-y					:= core.o
>  obj-$(CONFIG_USB_DWC3_GADGET)		+= gadget.o ep0.o
>  
>  obj-$(CONFIG_USB_DWC3_OMAP)		+= dwc3-omap.o
> +obj-$(CONFIG_USB_DWC3_GENERIC)		+= dwc3-generic.o
>  obj-$(CONFIG_USB_DWC3_UNIPHIER)		+= dwc3-uniphier.o
>  obj-$(CONFIG_USB_DWC3_PHY_OMAP)		+= ti_usb_phy.o
>  obj-$(CONFIG_USB_DWC3_PHY_SAMSUNG)	+= samsung_usb_phy.o
> diff --git a/drivers/usb/dwc3/dwc3-generic.c b/drivers/usb/dwc3/dwc3-generic.c
> new file mode 100644
> index 000000000000..7dd2555c2042
> --- /dev/null
> +++ b/drivers/usb/dwc3/dwc3-generic.c
> @@ -0,0 +1,165 @@
> +// SPDX-License-Identifier:     GPL-2.0
> +/*
> + * Generic DWC3 Glue layer
> + *
> + * Copyright (C) 2016 - 2018 Xilinx, Inc.
> + *
> + * Based on dwc3-omap.c.
> + */
> +
> +#include <common.h>
> +#include <dm.h>
> +#include <dm/device-internal.h>
> +#include <dm/lists.h>
> +#include <linux/usb/otg.h>
> +#include <linux/compat.h>
> +#include <linux/usb/ch9.h>
> +#include <linux/usb/gadget.h>
> +#include <malloc.h>
> +#include <usb.h>
> +#include "core.h"
> +#include "gadget.h"
> +#include "linux-compat.h"
> +
> +DECLARE_GLOBAL_DATA_PTR;
> +
> +int usb_gadget_handle_interrupts(int index)
> +{
> +	struct dwc3 *priv;
> +	struct udevice *dev;
> +	int ret;
> +
> +	ret = uclass_first_device(UCLASS_USB_DEV_GENERIC, &dev);
> +	if (!dev || ret) {
> +		pr_err("No USB device found\n");
> +		return -ENODEV;
> +	}
> +
> +	priv = dev_get_priv(dev);
> +
> +	dwc3_gadget_uboot_handle_interrupt(priv);
> +
> +	return 0;
> +}
> +
> +static int dwc3_generic_peripheral_probe(struct udevice *dev)
> +{
> +	struct dwc3 *priv = dev_get_priv(dev);
> +
> +	return dwc3_init(priv);
> +}
> +
> +static int dwc3_generic_peripheral_remove(struct udevice *dev)
> +{
> +	struct dwc3 *priv = dev_get_priv(dev);
> +
> +	dwc3_remove(priv);
> +
> +	return 0;
> +}
> +
> +static int dwc3_generic_peripheral_ofdata_to_platdata(struct udevice *dev)
> +{
> +	struct dwc3 *priv = dev_get_priv(dev);
> +	int node = dev_of_offset(dev);
> +
> +	priv->regs = (void *)devfdt_get_addr(dev);
> +	priv->regs += DWC3_GLOBALS_REGS_START;
> +
> +	priv->maximum_speed = usb_get_maximum_speed(node);
> +	if (priv->maximum_speed == USB_SPEED_UNKNOWN) {
> +		pr_err("Invalid usb maximum speed\n");
> +		return -ENODEV;
> +	}
> +
> +	priv->dr_mode = usb_get_dr_mode(node);
> +	if (priv->dr_mode == USB_DR_MODE_UNKNOWN) {
> +		pr_err("Invalid usb mode setup\n");
> +		return -ENODEV;
> +	}
> +
> +	return 0;
> +}
> +
> +static int dwc3_generic_peripheral_bind(struct udevice *dev)
> +{
> +	return device_probe(dev);
> +}
> +
> +U_BOOT_DRIVER(dwc3_generic_peripheral) = {
> +	.name	= "dwc3-generic-peripheral",
> +	.id	= UCLASS_USB_DEV_GENERIC,
> +	.ofdata_to_platdata = dwc3_generic_peripheral_ofdata_to_platdata,
> +	.probe = dwc3_generic_peripheral_probe,
> +	.remove = dwc3_generic_peripheral_remove,
> +	.bind = dwc3_generic_peripheral_bind,
> +	.platdata_auto_alloc_size = sizeof(struct usb_platdata),
> +	.priv_auto_alloc_size = sizeof(struct dwc3),
> +	.flags	= DM_FLAG_ALLOC_PRIV_DMA,
> +};
> +
> +static int dwc3_generic_bind(struct udevice *parent)
> +{
> +	const void *fdt = gd->fdt_blob;
> +	int node;
> +	int ret;
> +
> +	for (node = fdt_first_subnode(fdt, dev_of_offset(parent)); node > 0;
> +	     node = fdt_next_subnode(fdt, node)) {
> +		const char *name = fdt_get_name(fdt, node, NULL);
> +		enum usb_dr_mode dr_mode;
> +		struct udevice *dev;
> +
> +		debug("%s: subnode name: %s\n", __func__, name);
> +		if (strncmp(name, "dwc3@", 4))
> +			continue;
> +
> +		dr_mode = usb_get_dr_mode(node);
> +
> +		switch (dr_mode) {
> +		case USB_DR_MODE_PERIPHERAL:
> +		case USB_DR_MODE_OTG:
> +			debug("%s: dr_mode: OTG or Peripheral\n", __func__);
> +			ret = device_bind_driver_to_node(parent,
> +							 "dwc3-generic-peripheral",
> +							 name,
> +							 offset_to_ofnode(node),
> +							 &dev);
> +			if (ret) {
> +				debug("%s: not able to bind usb device mode\n",
> +				      __func__);
> +				return ret;
> +			}
> +			break;
> +		case USB_DR_MODE_HOST:
> +			debug("%s: dr_mode: HOST\n", __func__);
> +			ret = device_bind_driver_to_node(parent,
> +							 "dwc3-generic-host",
> +							 name,
> +							 offset_to_ofnode(node),
> +							 &dev);

Can you somehow improve this indent hell ?

> +			if (ret) {
> +				debug("%s: not able to bind usb host mode\n",
> +				      __func__);
> +				return ret;
> +			}
> +			break;
> +		default:
> +			break;
> +		};
> +	}
> +
> +	return 0;
> +}
> +
> +static const struct udevice_id dwc3_generic_ids[] = {
> +	{ .compatible = "xlnx,zynqmp-dwc3" },
> +	{ }
> +};
> +
> +U_BOOT_DRIVER(dwc3_generic_wrapper) = {
> +	.name	= "dwc3-generic-wrapper",
> +	.id	= UCLASS_MISC,
> +	.of_match = dwc3_generic_ids,
> +	.bind = dwc3_generic_bind,
> +};
>
Michal Simek May 17, 2018, 6:27 a.m. | #2
On 16.5.2018 16:41, Marek Vasut wrote:
> On 05/16/2018 04:26 PM, Michal Simek wrote:
>> By enabling BLK by default this is the next driver which needs to get
>> support for DM_USB. Adding generic DWC3 glue logic which only
>> parse nodes and read device mode. Based on it probe proper
>> host/peripheral DWC3 drivers for it.
>>
>> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
>> ---
>>
>>  drivers/usb/dwc3/Kconfig        |   6 ++
>>  drivers/usb/dwc3/Makefile       |   1 +
>>  drivers/usb/dwc3/dwc3-generic.c | 165 ++++++++++++++++++++++++++++++++
>>  3 files changed, 172 insertions(+)
>>  create mode 100644 drivers/usb/dwc3/dwc3-generic.c
>>
>> diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig
>> index ae7fc1c6304d..943b7630eba4 100644
>> --- a/drivers/usb/dwc3/Kconfig
>> +++ b/drivers/usb/dwc3/Kconfig
>> @@ -37,6 +37,12 @@ config USB_DWC3_OMAP
>>  
>>  	  Say 'Y' here if you have one such device
>>  
>> +config USB_DWC3_GENERIC
>> +	bool "Xilinx ZynqMP and similar Platforms"
>> +	depends on DM_USB && USB_DWC3
>> +	help
>> +	  Some platforms can reuse this DWC3 generic implementation.
>> +
>>  config USB_DWC3_UNIPHIER
>>  	bool "DesignWare USB3 Host Support on UniPhier Platforms"
>>  	depends on ARCH_UNIPHIER && USB_XHCI_DWC3
>> diff --git a/drivers/usb/dwc3/Makefile b/drivers/usb/dwc3/Makefile
>> index cd18b8d9ec02..60b5515a67da 100644
>> --- a/drivers/usb/dwc3/Makefile
>> +++ b/drivers/usb/dwc3/Makefile
>> @@ -7,6 +7,7 @@ dwc3-y					:= core.o
>>  obj-$(CONFIG_USB_DWC3_GADGET)		+= gadget.o ep0.o
>>  
>>  obj-$(CONFIG_USB_DWC3_OMAP)		+= dwc3-omap.o
>> +obj-$(CONFIG_USB_DWC3_GENERIC)		+= dwc3-generic.o
>>  obj-$(CONFIG_USB_DWC3_UNIPHIER)		+= dwc3-uniphier.o
>>  obj-$(CONFIG_USB_DWC3_PHY_OMAP)		+= ti_usb_phy.o
>>  obj-$(CONFIG_USB_DWC3_PHY_SAMSUNG)	+= samsung_usb_phy.o
>> diff --git a/drivers/usb/dwc3/dwc3-generic.c b/drivers/usb/dwc3/dwc3-generic.c
>> new file mode 100644
>> index 000000000000..7dd2555c2042
>> --- /dev/null
>> +++ b/drivers/usb/dwc3/dwc3-generic.c
>> @@ -0,0 +1,165 @@
>> +// SPDX-License-Identifier:     GPL-2.0
>> +/*
>> + * Generic DWC3 Glue layer
>> + *
>> + * Copyright (C) 2016 - 2018 Xilinx, Inc.
>> + *
>> + * Based on dwc3-omap.c.
>> + */
>> +
>> +#include <common.h>
>> +#include <dm.h>
>> +#include <dm/device-internal.h>
>> +#include <dm/lists.h>
>> +#include <linux/usb/otg.h>
>> +#include <linux/compat.h>
>> +#include <linux/usb/ch9.h>
>> +#include <linux/usb/gadget.h>
>> +#include <malloc.h>
>> +#include <usb.h>
>> +#include "core.h"
>> +#include "gadget.h"
>> +#include "linux-compat.h"
>> +
>> +DECLARE_GLOBAL_DATA_PTR;
>> +
>> +int usb_gadget_handle_interrupts(int index)
>> +{
>> +	struct dwc3 *priv;
>> +	struct udevice *dev;
>> +	int ret;
>> +
>> +	ret = uclass_first_device(UCLASS_USB_DEV_GENERIC, &dev);
>> +	if (!dev || ret) {
>> +		pr_err("No USB device found\n");
>> +		return -ENODEV;
>> +	}
>> +
>> +	priv = dev_get_priv(dev);
>> +
>> +	dwc3_gadget_uboot_handle_interrupt(priv);
>> +
>> +	return 0;
>> +}
>> +
>> +static int dwc3_generic_peripheral_probe(struct udevice *dev)
>> +{
>> +	struct dwc3 *priv = dev_get_priv(dev);
>> +
>> +	return dwc3_init(priv);
>> +}
>> +
>> +static int dwc3_generic_peripheral_remove(struct udevice *dev)
>> +{
>> +	struct dwc3 *priv = dev_get_priv(dev);
>> +
>> +	dwc3_remove(priv);
>> +
>> +	return 0;
>> +}
>> +
>> +static int dwc3_generic_peripheral_ofdata_to_platdata(struct udevice *dev)
>> +{
>> +	struct dwc3 *priv = dev_get_priv(dev);
>> +	int node = dev_of_offset(dev);
>> +
>> +	priv->regs = (void *)devfdt_get_addr(dev);
>> +	priv->regs += DWC3_GLOBALS_REGS_START;
>> +
>> +	priv->maximum_speed = usb_get_maximum_speed(node);
>> +	if (priv->maximum_speed == USB_SPEED_UNKNOWN) {
>> +		pr_err("Invalid usb maximum speed\n");
>> +		return -ENODEV;
>> +	}
>> +
>> +	priv->dr_mode = usb_get_dr_mode(node);
>> +	if (priv->dr_mode == USB_DR_MODE_UNKNOWN) {
>> +		pr_err("Invalid usb mode setup\n");
>> +		return -ENODEV;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static int dwc3_generic_peripheral_bind(struct udevice *dev)
>> +{
>> +	return device_probe(dev);
>> +}
>> +
>> +U_BOOT_DRIVER(dwc3_generic_peripheral) = {
>> +	.name	= "dwc3-generic-peripheral",
>> +	.id	= UCLASS_USB_DEV_GENERIC,
>> +	.ofdata_to_platdata = dwc3_generic_peripheral_ofdata_to_platdata,
>> +	.probe = dwc3_generic_peripheral_probe,
>> +	.remove = dwc3_generic_peripheral_remove,
>> +	.bind = dwc3_generic_peripheral_bind,
>> +	.platdata_auto_alloc_size = sizeof(struct usb_platdata),
>> +	.priv_auto_alloc_size = sizeof(struct dwc3),
>> +	.flags	= DM_FLAG_ALLOC_PRIV_DMA,
>> +};
>> +
>> +static int dwc3_generic_bind(struct udevice *parent)
>> +{
>> +	const void *fdt = gd->fdt_blob;
>> +	int node;
>> +	int ret;
>> +
>> +	for (node = fdt_first_subnode(fdt, dev_of_offset(parent)); node > 0;
>> +	     node = fdt_next_subnode(fdt, node)) {
>> +		const char *name = fdt_get_name(fdt, node, NULL);
>> +		enum usb_dr_mode dr_mode;
>> +		struct udevice *dev;
>> +
>> +		debug("%s: subnode name: %s\n", __func__, name);
>> +		if (strncmp(name, "dwc3@", 4))
>> +			continue;
>> +
>> +		dr_mode = usb_get_dr_mode(node);
>> +
>> +		switch (dr_mode) {
>> +		case USB_DR_MODE_PERIPHERAL:
>> +		case USB_DR_MODE_OTG:
>> +			debug("%s: dr_mode: OTG or Peripheral\n", __func__);
>> +			ret = device_bind_driver_to_node(parent,
>> +							 "dwc3-generic-peripheral",
>> +							 name,
>> +							 offset_to_ofnode(node),
>> +							 &dev);
>> +			if (ret) {
>> +				debug("%s: not able to bind usb device mode\n",
>> +				      __func__);
>> +				return ret;
>> +			}
>> +			break;
>> +		case USB_DR_MODE_HOST:
>> +			debug("%s: dr_mode: HOST\n", __func__);
>> +			ret = device_bind_driver_to_node(parent,
>> +							 "dwc3-generic-host",
>> +							 name,
>> +							 offset_to_ofnode(node),
>> +							 &dev);
> 
> Can you somehow improve this indent hell ?

Unfortunately this is correct style. I am happy to break 80 char limit
which will clean this up.  Just let me know your preference.

Thanks,
Michal
Marek Vasut May 17, 2018, 8:27 a.m. | #3
On 05/17/2018 08:27 AM, Michal Simek wrote:
> On 16.5.2018 16:41, Marek Vasut wrote:
>> On 05/16/2018 04:26 PM, Michal Simek wrote:
>>> By enabling BLK by default this is the next driver which needs to get
>>> support for DM_USB. Adding generic DWC3 glue logic which only
>>> parse nodes and read device mode. Based on it probe proper
>>> host/peripheral DWC3 drivers for it.
>>>
>>> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
>>> ---
>>>
>>>  drivers/usb/dwc3/Kconfig        |   6 ++
>>>  drivers/usb/dwc3/Makefile       |   1 +
>>>  drivers/usb/dwc3/dwc3-generic.c | 165 ++++++++++++++++++++++++++++++++
>>>  3 files changed, 172 insertions(+)
>>>  create mode 100644 drivers/usb/dwc3/dwc3-generic.c
>>>
>>> diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig
>>> index ae7fc1c6304d..943b7630eba4 100644
>>> --- a/drivers/usb/dwc3/Kconfig
>>> +++ b/drivers/usb/dwc3/Kconfig
>>> @@ -37,6 +37,12 @@ config USB_DWC3_OMAP
>>>  
>>>  	  Say 'Y' here if you have one such device
>>>  
>>> +config USB_DWC3_GENERIC
>>> +	bool "Xilinx ZynqMP and similar Platforms"
>>> +	depends on DM_USB && USB_DWC3
>>> +	help
>>> +	  Some platforms can reuse this DWC3 generic implementation.
>>> +
>>>  config USB_DWC3_UNIPHIER
>>>  	bool "DesignWare USB3 Host Support on UniPhier Platforms"
>>>  	depends on ARCH_UNIPHIER && USB_XHCI_DWC3
>>> diff --git a/drivers/usb/dwc3/Makefile b/drivers/usb/dwc3/Makefile
>>> index cd18b8d9ec02..60b5515a67da 100644
>>> --- a/drivers/usb/dwc3/Makefile
>>> +++ b/drivers/usb/dwc3/Makefile
>>> @@ -7,6 +7,7 @@ dwc3-y					:= core.o
>>>  obj-$(CONFIG_USB_DWC3_GADGET)		+= gadget.o ep0.o
>>>  
>>>  obj-$(CONFIG_USB_DWC3_OMAP)		+= dwc3-omap.o
>>> +obj-$(CONFIG_USB_DWC3_GENERIC)		+= dwc3-generic.o
>>>  obj-$(CONFIG_USB_DWC3_UNIPHIER)		+= dwc3-uniphier.o
>>>  obj-$(CONFIG_USB_DWC3_PHY_OMAP)		+= ti_usb_phy.o
>>>  obj-$(CONFIG_USB_DWC3_PHY_SAMSUNG)	+= samsung_usb_phy.o
>>> diff --git a/drivers/usb/dwc3/dwc3-generic.c b/drivers/usb/dwc3/dwc3-generic.c
>>> new file mode 100644
>>> index 000000000000..7dd2555c2042
>>> --- /dev/null
>>> +++ b/drivers/usb/dwc3/dwc3-generic.c
>>> @@ -0,0 +1,165 @@
>>> +// SPDX-License-Identifier:     GPL-2.0
>>> +/*
>>> + * Generic DWC3 Glue layer
>>> + *
>>> + * Copyright (C) 2016 - 2018 Xilinx, Inc.
>>> + *
>>> + * Based on dwc3-omap.c.
>>> + */
>>> +
>>> +#include <common.h>
>>> +#include <dm.h>
>>> +#include <dm/device-internal.h>
>>> +#include <dm/lists.h>
>>> +#include <linux/usb/otg.h>
>>> +#include <linux/compat.h>
>>> +#include <linux/usb/ch9.h>
>>> +#include <linux/usb/gadget.h>
>>> +#include <malloc.h>
>>> +#include <usb.h>
>>> +#include "core.h"
>>> +#include "gadget.h"
>>> +#include "linux-compat.h"
>>> +
>>> +DECLARE_GLOBAL_DATA_PTR;
>>> +
>>> +int usb_gadget_handle_interrupts(int index)
>>> +{
>>> +	struct dwc3 *priv;
>>> +	struct udevice *dev;
>>> +	int ret;
>>> +
>>> +	ret = uclass_first_device(UCLASS_USB_DEV_GENERIC, &dev);
>>> +	if (!dev || ret) {
>>> +		pr_err("No USB device found\n");
>>> +		return -ENODEV;
>>> +	}
>>> +
>>> +	priv = dev_get_priv(dev);
>>> +
>>> +	dwc3_gadget_uboot_handle_interrupt(priv);
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +static int dwc3_generic_peripheral_probe(struct udevice *dev)
>>> +{
>>> +	struct dwc3 *priv = dev_get_priv(dev);
>>> +
>>> +	return dwc3_init(priv);
>>> +}
>>> +
>>> +static int dwc3_generic_peripheral_remove(struct udevice *dev)
>>> +{
>>> +	struct dwc3 *priv = dev_get_priv(dev);
>>> +
>>> +	dwc3_remove(priv);
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +static int dwc3_generic_peripheral_ofdata_to_platdata(struct udevice *dev)
>>> +{
>>> +	struct dwc3 *priv = dev_get_priv(dev);
>>> +	int node = dev_of_offset(dev);
>>> +
>>> +	priv->regs = (void *)devfdt_get_addr(dev);
>>> +	priv->regs += DWC3_GLOBALS_REGS_START;
>>> +
>>> +	priv->maximum_speed = usb_get_maximum_speed(node);
>>> +	if (priv->maximum_speed == USB_SPEED_UNKNOWN) {
>>> +		pr_err("Invalid usb maximum speed\n");
>>> +		return -ENODEV;
>>> +	}
>>> +
>>> +	priv->dr_mode = usb_get_dr_mode(node);
>>> +	if (priv->dr_mode == USB_DR_MODE_UNKNOWN) {
>>> +		pr_err("Invalid usb mode setup\n");
>>> +		return -ENODEV;
>>> +	}
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +static int dwc3_generic_peripheral_bind(struct udevice *dev)
>>> +{
>>> +	return device_probe(dev);
>>> +}
>>> +
>>> +U_BOOT_DRIVER(dwc3_generic_peripheral) = {
>>> +	.name	= "dwc3-generic-peripheral",
>>> +	.id	= UCLASS_USB_DEV_GENERIC,
>>> +	.ofdata_to_platdata = dwc3_generic_peripheral_ofdata_to_platdata,
>>> +	.probe = dwc3_generic_peripheral_probe,
>>> +	.remove = dwc3_generic_peripheral_remove,
>>> +	.bind = dwc3_generic_peripheral_bind,
>>> +	.platdata_auto_alloc_size = sizeof(struct usb_platdata),
>>> +	.priv_auto_alloc_size = sizeof(struct dwc3),
>>> +	.flags	= DM_FLAG_ALLOC_PRIV_DMA,
>>> +};
>>> +
>>> +static int dwc3_generic_bind(struct udevice *parent)
>>> +{
>>> +	const void *fdt = gd->fdt_blob;
>>> +	int node;
>>> +	int ret;
>>> +
>>> +	for (node = fdt_first_subnode(fdt, dev_of_offset(parent)); node > 0;
>>> +	     node = fdt_next_subnode(fdt, node)) {
>>> +		const char *name = fdt_get_name(fdt, node, NULL);
>>> +		enum usb_dr_mode dr_mode;
>>> +		struct udevice *dev;
>>> +
>>> +		debug("%s: subnode name: %s\n", __func__, name);
>>> +		if (strncmp(name, "dwc3@", 4))
>>> +			continue;
>>> +
>>> +		dr_mode = usb_get_dr_mode(node);
>>> +
>>> +		switch (dr_mode) {
>>> +		case USB_DR_MODE_PERIPHERAL:
>>> +		case USB_DR_MODE_OTG:
>>> +			debug("%s: dr_mode: OTG or Peripheral\n", __func__);
>>> +			ret = device_bind_driver_to_node(parent,
>>> +							 "dwc3-generic-peripheral",
>>> +							 name,
>>> +							 offset_to_ofnode(node),
>>> +							 &dev);
>>> +			if (ret) {
>>> +				debug("%s: not able to bind usb device mode\n",
>>> +				      __func__);
>>> +				return ret;
>>> +			}
>>> +			break;
>>> +		case USB_DR_MODE_HOST:
>>> +			debug("%s: dr_mode: HOST\n", __func__);
>>> +			ret = device_bind_driver_to_node(parent,
>>> +							 "dwc3-generic-host",
>>> +							 name,
>>> +							 offset_to_ofnode(node),
>>> +							 &dev);
>>
>> Can you somehow improve this indent hell ?
> 
> Unfortunately this is correct style. I am happy to break 80 char limit
> which will clean this up.  Just let me know your preference.

Would separate function help here ? Or even better, something like

switch (drmode) {
 case foo
 case bar
   driver_name = "dwc3-generic-peripheral";
   break;
 case baz
  ...
}

ret = device_bind_driver...(parent, driver_name, name ....);

?

Patch

diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig
index ae7fc1c6304d..943b7630eba4 100644
--- a/drivers/usb/dwc3/Kconfig
+++ b/drivers/usb/dwc3/Kconfig
@@ -37,6 +37,12 @@  config USB_DWC3_OMAP
 
 	  Say 'Y' here if you have one such device
 
+config USB_DWC3_GENERIC
+	bool "Xilinx ZynqMP and similar Platforms"
+	depends on DM_USB && USB_DWC3
+	help
+	  Some platforms can reuse this DWC3 generic implementation.
+
 config USB_DWC3_UNIPHIER
 	bool "DesignWare USB3 Host Support on UniPhier Platforms"
 	depends on ARCH_UNIPHIER && USB_XHCI_DWC3
diff --git a/drivers/usb/dwc3/Makefile b/drivers/usb/dwc3/Makefile
index cd18b8d9ec02..60b5515a67da 100644
--- a/drivers/usb/dwc3/Makefile
+++ b/drivers/usb/dwc3/Makefile
@@ -7,6 +7,7 @@  dwc3-y					:= core.o
 obj-$(CONFIG_USB_DWC3_GADGET)		+= gadget.o ep0.o
 
 obj-$(CONFIG_USB_DWC3_OMAP)		+= dwc3-omap.o
+obj-$(CONFIG_USB_DWC3_GENERIC)		+= dwc3-generic.o
 obj-$(CONFIG_USB_DWC3_UNIPHIER)		+= dwc3-uniphier.o
 obj-$(CONFIG_USB_DWC3_PHY_OMAP)		+= ti_usb_phy.o
 obj-$(CONFIG_USB_DWC3_PHY_SAMSUNG)	+= samsung_usb_phy.o
diff --git a/drivers/usb/dwc3/dwc3-generic.c b/drivers/usb/dwc3/dwc3-generic.c
new file mode 100644
index 000000000000..7dd2555c2042
--- /dev/null
+++ b/drivers/usb/dwc3/dwc3-generic.c
@@ -0,0 +1,165 @@ 
+// SPDX-License-Identifier:     GPL-2.0
+/*
+ * Generic DWC3 Glue layer
+ *
+ * Copyright (C) 2016 - 2018 Xilinx, Inc.
+ *
+ * Based on dwc3-omap.c.
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <dm/device-internal.h>
+#include <dm/lists.h>
+#include <linux/usb/otg.h>
+#include <linux/compat.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/gadget.h>
+#include <malloc.h>
+#include <usb.h>
+#include "core.h"
+#include "gadget.h"
+#include "linux-compat.h"
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int usb_gadget_handle_interrupts(int index)
+{
+	struct dwc3 *priv;
+	struct udevice *dev;
+	int ret;
+
+	ret = uclass_first_device(UCLASS_USB_DEV_GENERIC, &dev);
+	if (!dev || ret) {
+		pr_err("No USB device found\n");
+		return -ENODEV;
+	}
+
+	priv = dev_get_priv(dev);
+
+	dwc3_gadget_uboot_handle_interrupt(priv);
+
+	return 0;
+}
+
+static int dwc3_generic_peripheral_probe(struct udevice *dev)
+{
+	struct dwc3 *priv = dev_get_priv(dev);
+
+	return dwc3_init(priv);
+}
+
+static int dwc3_generic_peripheral_remove(struct udevice *dev)
+{
+	struct dwc3 *priv = dev_get_priv(dev);
+
+	dwc3_remove(priv);
+
+	return 0;
+}
+
+static int dwc3_generic_peripheral_ofdata_to_platdata(struct udevice *dev)
+{
+	struct dwc3 *priv = dev_get_priv(dev);
+	int node = dev_of_offset(dev);
+
+	priv->regs = (void *)devfdt_get_addr(dev);
+	priv->regs += DWC3_GLOBALS_REGS_START;
+
+	priv->maximum_speed = usb_get_maximum_speed(node);
+	if (priv->maximum_speed == USB_SPEED_UNKNOWN) {
+		pr_err("Invalid usb maximum speed\n");
+		return -ENODEV;
+	}
+
+	priv->dr_mode = usb_get_dr_mode(node);
+	if (priv->dr_mode == USB_DR_MODE_UNKNOWN) {
+		pr_err("Invalid usb mode setup\n");
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static int dwc3_generic_peripheral_bind(struct udevice *dev)
+{
+	return device_probe(dev);
+}
+
+U_BOOT_DRIVER(dwc3_generic_peripheral) = {
+	.name	= "dwc3-generic-peripheral",
+	.id	= UCLASS_USB_DEV_GENERIC,
+	.ofdata_to_platdata = dwc3_generic_peripheral_ofdata_to_platdata,
+	.probe = dwc3_generic_peripheral_probe,
+	.remove = dwc3_generic_peripheral_remove,
+	.bind = dwc3_generic_peripheral_bind,
+	.platdata_auto_alloc_size = sizeof(struct usb_platdata),
+	.priv_auto_alloc_size = sizeof(struct dwc3),
+	.flags	= DM_FLAG_ALLOC_PRIV_DMA,
+};
+
+static int dwc3_generic_bind(struct udevice *parent)
+{
+	const void *fdt = gd->fdt_blob;
+	int node;
+	int ret;
+
+	for (node = fdt_first_subnode(fdt, dev_of_offset(parent)); node > 0;
+	     node = fdt_next_subnode(fdt, node)) {
+		const char *name = fdt_get_name(fdt, node, NULL);
+		enum usb_dr_mode dr_mode;
+		struct udevice *dev;
+
+		debug("%s: subnode name: %s\n", __func__, name);
+		if (strncmp(name, "dwc3@", 4))
+			continue;
+
+		dr_mode = usb_get_dr_mode(node);
+
+		switch (dr_mode) {
+		case USB_DR_MODE_PERIPHERAL:
+		case USB_DR_MODE_OTG:
+			debug("%s: dr_mode: OTG or Peripheral\n", __func__);
+			ret = device_bind_driver_to_node(parent,
+							 "dwc3-generic-peripheral",
+							 name,
+							 offset_to_ofnode(node),
+							 &dev);
+			if (ret) {
+				debug("%s: not able to bind usb device mode\n",
+				      __func__);
+				return ret;
+			}
+			break;
+		case USB_DR_MODE_HOST:
+			debug("%s: dr_mode: HOST\n", __func__);
+			ret = device_bind_driver_to_node(parent,
+							 "dwc3-generic-host",
+							 name,
+							 offset_to_ofnode(node),
+							 &dev);
+			if (ret) {
+				debug("%s: not able to bind usb host mode\n",
+				      __func__);
+				return ret;
+			}
+			break;
+		default:
+			break;
+		};
+	}
+
+	return 0;
+}
+
+static const struct udevice_id dwc3_generic_ids[] = {
+	{ .compatible = "xlnx,zynqmp-dwc3" },
+	{ }
+};
+
+U_BOOT_DRIVER(dwc3_generic_wrapper) = {
+	.name	= "dwc3-generic-wrapper",
+	.id	= UCLASS_MISC,
+	.of_match = dwc3_generic_ids,
+	.bind = dwc3_generic_bind,
+};