[PATCH v2 0/7] usb: dwc3-omap: add dt support

[PATCH v2 0/7] usb: dwc3-omap: add dt support

[Kishon Vijay Abraham I]

This patch series adds dt support to dwc3 core and fixes few minor
stuff in dwc3-omap glue to get dwc3 working.

While at that it also uses *of_platform* to create the child device
(dwc3-core) and fixes to use runtime API's to enable clock and write
to SYSCONFIG register.

Changes from v1:
* made device_for_each_child() as a seperate patch
* made all other minor fixes wrt typos and function renames

This patch series is developed on:
git://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb.git dwc3

Kishon Vijay Abraham I (7):
  usb: dwc3-omap: use device_for_each_child to handle child removal
  usb: dwc3-omap: use of_platform API to create dwc3 core pdev
  usb: dwc3-omap: use runtime API's to enable clocks
  usb: dwc3-omap: Remove explicit writes to SYSCONFIG register
  usb: dwc3-omap: Add an API to write to dwc mailbox
  usb: dwc3-omap: Minor fixes to get dt working
  usb: dwc3: core: add dt support for dwc3 core

 Documentation/devicetree/bindings/usb/dwc3.txt |   23 ++++
 drivers/usb/dwc3/core.c                        |   14 +-
 drivers/usb/dwc3/dwc3-omap.c                   |  167 +++++++++++++-----------
 include/linux/usb/dwc3-omap.h                  |   30 +++++
 4 files changed, 158 insertions(+), 76 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/usb/dwc3.txt
 create mode 100644 include/linux/usb/dwc3-omap.h

-- 
1.7.9.5

[PATCH v2 1/7] usb: dwc3-omap: use device_for_each_child to handle child removal

[Kishon Vijay Abraham I]

Used device_for_each_child() to handle child device (dwc3 core) removal
during devexit of dwc3 omap.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
 drivers/usb/dwc3/dwc3-omap.c |   12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/dwc3/dwc3-omap.c b/drivers/usb/dwc3/dwc3-omap.c
index 479dc04..e335da3 100644
--- a/drivers/usb/dwc3/dwc3-omap.c
+++ b/drivers/usb/dwc3/dwc3-omap.c
@@ -204,6 +204,15 @@ static irqreturn_t dwc3_omap_interrupt(int irq, void *_omap)
 	return IRQ_HANDLED;
 }
 
+static int dwc3_omap_remove_core(struct device *dev, void *c)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+
+	platform_device_unregister(pdev);
+
+	return 0;
+}
+
 static int __devinit dwc3_omap_probe(struct platform_device *pdev)
 {
 	struct dwc3_omap_data	*pdata = pdev->dev.platform_data;
@@ -370,9 +379,8 @@ static int __devexit dwc3_omap_remove(struct platform_device *pdev)
 {
 	struct dwc3_omap	*omap = platform_get_drvdata(pdev);
 
-	platform_device_unregister(omap->dwc3);
-
 	dwc3_put_device_id(omap->dwc3->id);
+	device_for_each_child(&pdev->dev, NULL, dwc3_omap_remove_core);
 
 	return 0;
 }
-- 
1.7.9.5

[PATCH v2 2/7] usb: dwc3-omap: use of_platform API to create dwc3 core pdev

[Kishon Vijay Abraham I]

Used of_platform_populate() to populate dwc3 core platform_device
from device tree data. Since now the allocation of unique device id is
handled be of_*, removed the call to dwc3_get_device_id.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
 drivers/usb/dwc3/dwc3-omap.c |   52 ++++++++----------------------------------
 1 file changed, 10 insertions(+), 42 deletions(-)

diff --git a/drivers/usb/dwc3/dwc3-omap.c b/drivers/usb/dwc3/dwc3-omap.c
index e335da3..cb4037a 100644
--- a/drivers/usb/dwc3/dwc3-omap.c
+++ b/drivers/usb/dwc3/dwc3-omap.c
@@ -47,6 +47,7 @@
 #include <linux/ioport.h>
 #include <linux/io.h>
 #include <linux/of.h>
+#include <linux/of_platform.h>
 
 #include "core.h"
 
@@ -130,7 +131,6 @@ struct dwc3_omap {
 	/* device lock */
 	spinlock_t		lock;
 
-	struct platform_device	*dwc3;
 	struct device		*dev;
 
 	int			irq;
@@ -218,12 +218,10 @@ static int __devinit dwc3_omap_probe(struct platform_device *pdev)
 	struct dwc3_omap_data	*pdata = pdev->dev.platform_data;
 	struct device_node	*node = pdev->dev.of_node;
 
-	struct platform_device	*dwc3;
 	struct dwc3_omap	*omap;
 	struct resource		*res;
 	struct device		*dev = &pdev->dev;
 
-	int			devid;
 	int			size;
 	int			ret = -ENOMEM;
 	int			irq;
@@ -260,34 +258,19 @@ static int __devinit dwc3_omap_probe(struct platform_device *pdev)
 		return -ENOMEM;
 	}
 
-	devid = dwc3_get_device_id();
-	if (devid < 0)
-		return -ENODEV;
-
-	dwc3 = platform_device_alloc("dwc3", devid);
-	if (!dwc3) {
-		dev_err(dev, "couldn't allocate dwc3 device\n");
-		goto err1;
-	}
-
 	context = devm_kzalloc(dev, resource_size(res), GFP_KERNEL);
 	if (!context) {
 		dev_err(dev, "couldn't allocate dwc3 context memory\n");
-		goto err2;
+		return -ENOMEM;
 	}
 
 	spin_lock_init(&omap->lock);
-	dma_set_coherent_mask(&dwc3->dev, dev->coherent_dma_mask);
 
-	dwc3->dev.parent = dev;
-	dwc3->dev.dma_mask = dev->dma_mask;
-	dwc3->dev.dma_parms = dev->dma_parms;
 	omap->resource_size = resource_size(res);
 	omap->context	= context;
 	omap->dev	= dev;
 	omap->irq	= irq;
 	omap->base	= base;
-	omap->dwc3	= dwc3;
 
 	reg = dwc3_omap_readl(omap->base, USBOTGSS_UTMI_OTG_STATUS);
 
@@ -332,7 +315,7 @@ static int __devinit dwc3_omap_probe(struct platform_device *pdev)
 	if (ret) {
 		dev_err(dev, "failed to request IRQ #%d --> %d\n",
 				omap->irq, ret);
-		goto err2;
+		return ret;
 	}
 
 	/* enable all IRQs */
@@ -351,35 +334,20 @@ static int __devinit dwc3_omap_probe(struct platform_device *pdev)
 
 	dwc3_omap_writel(omap->base, USBOTGSS_IRQENABLE_SET_1, reg);
 
-	ret = platform_device_add_resources(dwc3, pdev->resource,
-			pdev->num_resources);
-	if (ret) {
-		dev_err(dev, "couldn't add resources to dwc3 device\n");
-		goto err2;
-	}
-
-	ret = platform_device_add(dwc3);
-	if (ret) {
-		dev_err(dev, "failed to register dwc3 device\n");
-		goto err2;
+	if (node) {
+		ret = of_platform_populate(node, NULL, NULL, dev);
+		if (ret) {
+			dev_err(&pdev->dev,
+				"failed to add create dwc3 core\n");
+			return ret;
+		}
 	}
 
 	return 0;
-
-err2:
-	platform_device_put(dwc3);
-
-err1:
-	dwc3_put_device_id(devid);
-
-	return ret;
 }
 
 static int __devexit dwc3_omap_remove(struct platform_device *pdev)
 {
-	struct dwc3_omap	*omap = platform_get_drvdata(pdev);
-
-	dwc3_put_device_id(omap->dwc3->id);
 	device_for_each_child(&pdev->dev, NULL, dwc3_omap_remove_core);
 
 	return 0;
-- 
1.7.9.5

[PATCH v2 3/7] usb: dwc3-omap: use runtime API's to enable clocks

[Kishon Vijay Abraham I]

Before accessing any register, runtime API's should be invoked to enable
the clocks. runtime API's are added here to prevent abort during register
access.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
 drivers/usb/dwc3/dwc3-omap.c |   10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/usb/dwc3/dwc3-omap.c b/drivers/usb/dwc3/dwc3-omap.c
index cb4037a..850a0cf 100644
--- a/drivers/usb/dwc3/dwc3-omap.c
+++ b/drivers/usb/dwc3/dwc3-omap.c
@@ -43,6 +43,7 @@
 #include <linux/spinlock.h>
 #include <linux/platform_device.h>
 #include <linux/platform_data/dwc3-omap.h>
+#include <linux/pm_runtime.h>
 #include <linux/dma-mapping.h>
 #include <linux/ioport.h>
 #include <linux/io.h>
@@ -272,6 +273,13 @@ static int __devinit dwc3_omap_probe(struct platform_device *pdev)
 	omap->irq	= irq;
 	omap->base	= base;
 
+	pm_runtime_enable(dev);
+	ret = pm_runtime_get_sync(dev);
+	if (ret < 0) {
+		dev_err(dev, "get_sync failed with err %d\n", ret);
+		return ret;
+	}
+
 	reg = dwc3_omap_readl(omap->base, USBOTGSS_UTMI_OTG_STATUS);
 
 	utmi_mode = of_get_property(node, "utmi-mode", &size);
@@ -348,6 +356,8 @@ static int __devinit dwc3_omap_probe(struct platform_device *pdev)
 
 static int __devexit dwc3_omap_remove(struct platform_device *pdev)
 {
+	pm_runtime_put_sync(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
 	device_for_each_child(&pdev->dev, NULL, dwc3_omap_remove_core);
 
 	return 0;
-- 
1.7.9.5

[PATCH v2 4/7] usb: dwc3-omap: Remove explicit writes to SYSCONFIG register

[Kishon Vijay Abraham I]

The runtime API's takes care of setting the SYSCONFIG register with
appropriate values. Hence explicit writes to SYSCONFIG register is
removed.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
 drivers/usb/dwc3/dwc3-omap.c |   26 --------------------------
 1 file changed, 26 deletions(-)

diff --git a/drivers/usb/dwc3/dwc3-omap.c b/drivers/usb/dwc3/dwc3-omap.c
index 850a0cf..d417bec 100644
--- a/drivers/usb/dwc3/dwc3-omap.c
+++ b/drivers/usb/dwc3/dwc3-omap.c
@@ -77,23 +77,6 @@
 
 /* SYSCONFIG REGISTER */
 #define USBOTGSS_SYSCONFIG_DMADISABLE		(1 << 16)
-#define USBOTGSS_SYSCONFIG_STANDBYMODE(x)	((x) << 4)
-
-#define USBOTGSS_STANDBYMODE_FORCE_STANDBY	0
-#define USBOTGSS_STANDBYMODE_NO_STANDBY		1
-#define USBOTGSS_STANDBYMODE_SMART_STANDBY	2
-#define USBOTGSS_STANDBYMODE_SMART_WAKEUP	3
-
-#define USBOTGSS_STANDBYMODE_MASK		(0x03 << 4)
-
-#define USBOTGSS_SYSCONFIG_IDLEMODE(x)		((x) << 2)
-
-#define USBOTGSS_IDLEMODE_FORCE_IDLE		0
-#define USBOTGSS_IDLEMODE_NO_IDLE		1
-#define USBOTGSS_IDLEMODE_SMART_IDLE		2
-#define USBOTGSS_IDLEMODE_SMART_WAKEUP		3
-
-#define USBOTGSS_IDLEMODE_MASK			(0x03 << 2)
 
 /* IRQ_EOI REGISTER */
 #define USBOTGSS_IRQ_EOI_LINE_NUMBER		(1 << 0)
@@ -309,15 +292,6 @@ static int __devinit dwc3_omap_probe(struct platform_device *pdev)
 	reg = dwc3_omap_readl(omap->base, USBOTGSS_SYSCONFIG);
 	omap->dma_status = !!(reg & USBOTGSS_SYSCONFIG_DMADISABLE);
 
-	/* Set No-Idle and No-Standby */
-	reg &= ~(USBOTGSS_STANDBYMODE_MASK
-			| USBOTGSS_IDLEMODE_MASK);
-
-	reg |= (USBOTGSS_SYSCONFIG_STANDBYMODE(USBOTGSS_STANDBYMODE_NO_STANDBY)
-		| USBOTGSS_SYSCONFIG_IDLEMODE(USBOTGSS_IDLEMODE_NO_IDLE));
-
-	dwc3_omap_writel(omap->base, USBOTGSS_SYSCONFIG, reg);
-
 	ret = devm_request_irq(dev, omap->irq, dwc3_omap_interrupt, 0,
 			"dwc3-omap", omap);
 	if (ret) {
-- 
1.7.9.5

[PATCH v2 5/7] usb: dwc3-omap: Add an API to write to dwc mailbox

[Kishon Vijay Abraham I]

Add an API in the omap glue layer to write to the mailbox register which
can be used by comparator driver(twl). To pass the detection of the attached
device (signified by VBUS, ID) to the dwc3 core, dwc3 core has to write
to the mailbox regiter.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
 drivers/usb/dwc3/dwc3-omap.c  |   59 +++++++++++++++++++++++++++++++++++++++++
 include/linux/usb/dwc3-omap.h |   30 +++++++++++++++++++++
 2 files changed, 89 insertions(+)
 create mode 100644 include/linux/usb/dwc3-omap.h

diff --git a/drivers/usb/dwc3/dwc3-omap.c b/drivers/usb/dwc3/dwc3-omap.c
index d417bec..c19affa 100644
--- a/drivers/usb/dwc3/dwc3-omap.c
+++ b/drivers/usb/dwc3/dwc3-omap.c
@@ -43,6 +43,7 @@
 #include <linux/spinlock.h>
 #include <linux/platform_device.h>
 #include <linux/platform_data/dwc3-omap.h>
+#include <linux/usb/dwc3-omap.h>
 #include <linux/pm_runtime.h>
 #include <linux/dma-mapping.h>
 #include <linux/ioport.h>
@@ -126,6 +127,8 @@ struct dwc3_omap {
 	u32			dma_status:1;
 };
 
+struct dwc3_omap		*_omap;
+
 static inline u32 dwc3_omap_readl(void __iomem *base, u32 offset)
 {
 	return readl(base + offset);
@@ -136,6 +139,56 @@ static inline void dwc3_omap_writel(void __iomem *base, u32 offset, u32 value)
 	writel(value, base + offset);
 }
 
+void dwc3_omap_mailbox(enum omap_dwc3_vbus_id_status status)
+{
+	u32			val;
+	struct dwc3_omap	*omap = _omap;
+
+	switch (status) {
+	case OMAP_DWC3_ID_GROUND:
+		dev_dbg(omap->dev, "ID GND\n");
+
+		val = dwc3_omap_readl(omap->base, USBOTGSS_UTMI_OTG_STATUS);
+		val &= ~(USBOTGSS_UTMI_OTG_STATUS_IDDIG
+				| USBOTGSS_UTMI_OTG_STATUS_VBUSVALID
+				| USBOTGSS_UTMI_OTG_STATUS_SESSEND);
+		val |= USBOTGSS_UTMI_OTG_STATUS_SESSVALID
+				| USBOTGSS_UTMI_OTG_STATUS_POWERPRESENT;
+		dwc3_omap_writel(omap->base, USBOTGSS_UTMI_OTG_STATUS, val);
+		break;
+
+	case OMAP_DWC3_VBUS_VALID:
+		dev_dbg(omap->dev, "VBUS Connect\n");
+
+		val = dwc3_omap_readl(omap->base, USBOTGSS_UTMI_OTG_STATUS);
+		val &= ~USBOTGSS_UTMI_OTG_STATUS_SESSEND;
+		val |= USBOTGSS_UTMI_OTG_STATUS_IDDIG
+				| USBOTGSS_UTMI_OTG_STATUS_VBUSVALID
+				| USBOTGSS_UTMI_OTG_STATUS_SESSVALID
+				| USBOTGSS_UTMI_OTG_STATUS_POWERPRESENT;
+		dwc3_omap_writel(omap->base, USBOTGSS_UTMI_OTG_STATUS, val);
+		break;
+
+	case OMAP_DWC3_ID_FLOAT:
+	case OMAP_DWC3_VBUS_OFF:
+		dev_dbg(omap->dev, "VBUS Disconnect\n");
+
+		val = dwc3_omap_readl(omap->base, USBOTGSS_UTMI_OTG_STATUS);
+		val &= ~(USBOTGSS_UTMI_OTG_STATUS_SESSVALID
+				| USBOTGSS_UTMI_OTG_STATUS_VBUSVALID
+				| USBOTGSS_UTMI_OTG_STATUS_POWERPRESENT);
+		val |= USBOTGSS_UTMI_OTG_STATUS_SESSEND
+				| USBOTGSS_UTMI_OTG_STATUS_IDDIG;
+		dwc3_omap_writel(omap->base, USBOTGSS_UTMI_OTG_STATUS, val);
+		break;
+
+	default:
+		dev_dbg(omap->dev, "ID float\n");
+	}
+
+	return;
+}
+EXPORT_SYMBOL_GPL(dwc3_omap_mailbox);
 
 static irqreturn_t dwc3_omap_interrupt(int irq, void *_omap)
 {
@@ -256,6 +309,12 @@ static int __devinit dwc3_omap_probe(struct platform_device *pdev)
 	omap->irq	= irq;
 	omap->base	= base;
 
+	/*
+	 * REVISIT if we ever have two instances of the wrapper, we will be
+	 * in big trouble
+	 */
+	_omap	= omap;
+
 	pm_runtime_enable(dev);
 	ret = pm_runtime_get_sync(dev);
 	if (ret < 0) {
diff --git a/include/linux/usb/dwc3-omap.h b/include/linux/usb/dwc3-omap.h
new file mode 100644
index 0000000..6ebcf73
--- /dev/null
+++ b/include/linux/usb/dwc3-omap.h
@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2011-2012 by Texas Instruments
+ *
+ * The Inventra Controller Driver for Linux is free software; you
+ * can redistribute it and/or modify it under the terms of the GNU
+ * General Public License version 2 as published by the Free Software
+ * Foundation.
+ */
+
+#ifndef __DWC3_OMAP_H__
+#define __DWC3_OMAP_H__
+
+enum omap_dwc3_vbus_id_status {
+	OMAP_DWC3_UNKNOWN = 0,
+	OMAP_DWC3_ID_GROUND,
+	OMAP_DWC3_ID_FLOAT,
+	OMAP_DWC3_VBUS_VALID,
+	OMAP_DWC3_VBUS_OFF,
+};
+
+#if (defined(CONFIG_USB_DWC3) || defined(CONFIG_USB_DWC3_MODULE))
+void dwc3_omap_mailbox(enum omap_dwc3_vbus_id_status status);
+#else
+static inline void dwc3_omap_mailbox(enum omap_dwc3_vbus_id_status status)
+{
+	return;
+}
+#endif
+
+#endif	/* __DWC3_OMAP_H__ */
-- 
1.7.9.5

[PATCH v2 6/7] usb: dwc3-omap: Minor fixes to get dt working

[Kishon Vijay Abraham I]

Includes few minor fixes in dwc3-omap like populating the compatible
string in a correct way, extracting the utmi-mode property properly and
changing the index of get_irq since irq of core is removed from hwmod
entry.
Also updated the documentation with dwc3-omap device tree binding
information.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
 drivers/usb/dwc3/dwc3-omap.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/dwc3/dwc3-omap.c b/drivers/usb/dwc3/dwc3-omap.c
index c19affa..25bd847 100644
--- a/drivers/usb/dwc3/dwc3-omap.c
+++ b/drivers/usb/dwc3/dwc3-omap.c
@@ -277,13 +277,13 @@ static int __devinit dwc3_omap_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, omap);
 
-	irq = platform_get_irq(pdev, 1);
+	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
 		dev_err(dev, "missing IRQ resource\n");
 		return -EINVAL;
 	}
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res) {
 		dev_err(dev, "missing memory base resource\n");
 		return -EINVAL;
@@ -326,7 +326,7 @@ static int __devinit dwc3_omap_probe(struct platform_device *pdev)
 
 	utmi_mode = of_get_property(node, "utmi-mode", &size);
 	if (utmi_mode && size == sizeof(*utmi_mode)) {
-		reg |= *utmi_mode;
+		reg |= be32_to_cpup(utmi_mode);
 	} else {
 		if (!pdata) {
 			dev_dbg(dev, "missing platform data\n");
@@ -398,7 +398,7 @@ static int __devexit dwc3_omap_remove(struct platform_device *pdev)
 
 static const struct of_device_id of_dwc3_matach[] = {
 	{
-		"ti,dwc3",
+		.compatible =	"ti,dwc3"
 	},
 	{ },
 };
-- 
1.7.9.5

Re: [PATCH v2 6/7] usb: dwc3-omap: Minor fixes to get dt working

[Sergei Shtylyov]

Hello.

On 01-10-2012 12:25, Kishon Vijay Abraham I wrote:

> Includes few minor fixes in dwc3-omap like populating the compatible
> string in a correct way, extracting the utmi-mode property properly and
> changing the index of get_irq since irq of core is removed from hwmod
> entry.
> Also updated the documentation with dwc3-omap device tree binding
> information.
>
> Signed-off-by: Kishon Vijay Abraham I<kishon@ti.com>
> ---
>   drivers/usb/dwc3/dwc3-omap.c |    8 ++++----
>   1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/usb/dwc3/dwc3-omap.c b/drivers/usb/dwc3/dwc3-omap.c
> index c19affa..25bd847 100644
> --- a/drivers/usb/dwc3/dwc3-omap.c
> +++ b/drivers/usb/dwc3/dwc3-omap.c
> @@ -277,13 +277,13 @@ static int __devinit dwc3_omap_probe(struct platform_device *pdev)
>
>   	platform_set_drvdata(pdev, omap);
>
> -	irq = platform_get_irq(pdev, 1);
> +	irq = platform_get_irq(pdev, 0);
>   	if (irq<  0) {
>   		dev_err(dev, "missing IRQ resource\n");
>   		return -EINVAL;
>   	}
>
> -	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>   	if (!res) {
>   		dev_err(dev, "missing memory base resource\n");
>   		return -EINVAL;
> @@ -326,7 +326,7 @@ static int __devinit dwc3_omap_probe(struct platform_device *pdev)
>
>   	utmi_mode = of_get_property(node, "utmi-mode",&size);
>   	if (utmi_mode&&  size == sizeof(*utmi_mode)) {
> -		reg |= *utmi_mode;
> +		reg |= be32_to_cpup(utmi_mode);

    Why not just use of_property_read_u32() instead of all this?

WBR, Sergei

[PATCH v2 7/7] usb: dwc3: core: add dt support for dwc3 core

[Kishon Vijay Abraham I]

Added dwc3 support for dwc3 core and update the documentation with
device tree binding information.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
 Documentation/devicetree/bindings/usb/dwc3.txt |   23 +++++++++++++++++++++++
 drivers/usb/dwc3/core.c                        |   14 ++++++++++++--
 2 files changed, 35 insertions(+), 2 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/usb/dwc3.txt

diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt b/Documentation/devicetree/bindings/usb/dwc3.txt
new file mode 100644
index 0000000..9ec9316
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/dwc3.txt
@@ -0,0 +1,23 @@
+synopsys DWC3 CORE
+
+DWC3- USB3 CONTROLLER
+
+Required properties:
+ - compatible: must be "synopsys,dwc3"
+ - reg : Address and length of the register set for the device
+ - interrupts: Interrupts used by the dwc3 controller.
+ - interrupt-parent: the phandle for the interrupt controller that
+   services interrupts for this device.
+
+Optional properties:
+ - tx-fifo-resize: determines if the FIFO *has* to be reallocated.
+
+This is usually a subnode to DWC3 glue to which it is connected.
+
+dwc3@4a030000 {
+	compatible = "synopsys,dwc3";
+	reg = <0x4a030000 0xcfff>;
+	interrupts = <0 92 4>
+	interrupt-parent = <&gic>
+	tx-fifo-resize;
+};
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 08a5738..4335a17 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -484,8 +484,7 @@ static int __devinit dwc3_probe(struct platform_device *pdev)
 	else
 		dwc->maximum_speed = DWC3_DCFG_SUPERSPEED;
 
-	if (of_get_property(node, "tx-fifo-resize", NULL))
-		dwc->needs_fifo_resize = true;
+	dwc->needs_fifo_resize = of_property_read_bool(node, "tx-fifo-resize");
 
 	pm_runtime_enable(dev);
 	pm_runtime_get_sync(dev);
@@ -602,11 +601,22 @@ static int __devexit dwc3_remove(struct platform_device *pdev)
 	return 0;
 }
 
+#ifdef CONFIG_OF
+static const struct of_device_id of_dwc3_match[] = {
+	{
+		.compatible = "synopsys,dwc3"
+	},
+	{ },
+};
+MODULE_DEVICE_TABLE(of, of_dwc3_match);
+#endif
+
 static struct platform_driver dwc3_driver = {
 	.probe		= dwc3_probe,
 	.remove		= __devexit_p(dwc3_remove),
 	.driver		= {
 		.name	= "dwc3",
+		.of_match_table	= of_match_ptr(of_dwc3_match),
 	},
 };
 
-- 
1.7.9.5