[v2,1/5] usb: gadget: aspeed: read vhub properties from device tree
diff mbox series

Message ID 20200212215717.9474-2-rentao.bupt@gmail.com
State Superseded, archived
Headers show
Series
  • aspeed-g6: enable usb support
Related show

Commit Message

Tao Ren Feb. 12, 2020, 9:57 p.m. UTC
From: Tao Ren <rentao.bupt@gmail.com>

The patch introduces 2 DT properties ("aspeed,vhub-downstream-ports" and
"aspeed,vhub-generic-endpoints") which replaces hardcoded port/endpoint
number. It is to make it more convenient to add support for newer vhub
revisions with different number of ports and endpoints.

Signed-off-by: Tao Ren <rentao.bupt@gmail.com>
Reviewed-by: Joel Stanley <joel@jms.id.au>
---
 Changes in v2:
   - removed ast_vhub_config structure and moved vhub port/endpoint
     number into device tree.

 drivers/usb/gadget/udc/aspeed-vhub/core.c | 68 ++++++++++++++---------
 drivers/usb/gadget/udc/aspeed-vhub/dev.c  | 30 +++++++---
 drivers/usb/gadget/udc/aspeed-vhub/epn.c  |  4 +-
 drivers/usb/gadget/udc/aspeed-vhub/hub.c  | 26 ++++++---
 drivers/usb/gadget/udc/aspeed-vhub/vhub.h | 23 +++-----
 5 files changed, 91 insertions(+), 60 deletions(-)

Comments

Andrew Jeffery Feb. 16, 2020, 11:48 p.m. UTC | #1
On Thu, 13 Feb 2020, at 08:27, rentao.bupt@gmail.com wrote:
> From: Tao Ren <rentao.bupt@gmail.com>
> 
> The patch introduces 2 DT properties ("aspeed,vhub-downstream-ports" and
> "aspeed,vhub-generic-endpoints") which replaces hardcoded port/endpoint
> number. It is to make it more convenient to add support for newer vhub
> revisions with different number of ports and endpoints.
> 
> Signed-off-by: Tao Ren <rentao.bupt@gmail.com>
> Reviewed-by: Joel Stanley <joel@jms.id.au>
> ---
>  Changes in v2:
>    - removed ast_vhub_config structure and moved vhub port/endpoint
>      number into device tree.
> 
>  drivers/usb/gadget/udc/aspeed-vhub/core.c | 68 ++++++++++++++---------
>  drivers/usb/gadget/udc/aspeed-vhub/dev.c  | 30 +++++++---
>  drivers/usb/gadget/udc/aspeed-vhub/epn.c  |  4 +-
>  drivers/usb/gadget/udc/aspeed-vhub/hub.c  | 26 ++++++---
>  drivers/usb/gadget/udc/aspeed-vhub/vhub.h | 23 +++-----
>  5 files changed, 91 insertions(+), 60 deletions(-)
> 
> diff --git a/drivers/usb/gadget/udc/aspeed-vhub/core.c 
> b/drivers/usb/gadget/udc/aspeed-vhub/core.c
> index 90b134d5dca9..d6f737fac4e2 100644
> --- a/drivers/usb/gadget/udc/aspeed-vhub/core.c
> +++ b/drivers/usb/gadget/udc/aspeed-vhub/core.c
> @@ -99,7 +99,7 @@ static irqreturn_t ast_vhub_irq(int irq, void *data)
>  {
>  	struct ast_vhub *vhub = data;
>  	irqreturn_t iret = IRQ_NONE;
> -	u32 istat;
> +	u32 i, istat;
>  
>  	/* Stale interrupt while tearing down */
>  	if (!vhub->ep0_bufs)
> @@ -121,10 +121,10 @@ static irqreturn_t ast_vhub_irq(int irq, void *data)
>  
>  	/* Handle generic EPs first */
>  	if (istat & VHUB_IRQ_EP_POOL_ACK_STALL) {
> -		u32 i, ep_acks = readl(vhub->regs + AST_VHUB_EP_ACK_ISR);
> +		u32 ep_acks = readl(vhub->regs + AST_VHUB_EP_ACK_ISR);
>  		writel(ep_acks, vhub->regs + AST_VHUB_EP_ACK_ISR);
>  
> -		for (i = 0; ep_acks && i < AST_VHUB_NUM_GEN_EPs; i++) {
> +		for (i = 0; ep_acks && i < vhub->max_epns; i++) {
>  			u32 mask = VHUB_EP_IRQ(i);
>  			if (ep_acks & mask) {
>  				ast_vhub_epn_ack_irq(&vhub->epns[i]);
> @@ -134,21 +134,11 @@ static irqreturn_t ast_vhub_irq(int irq, void *data)
>  	}
>  
>  	/* Handle device interrupts */
> -	if (istat & (VHUB_IRQ_DEVICE1 |
> -		     VHUB_IRQ_DEVICE2 |
> -		     VHUB_IRQ_DEVICE3 |
> -		     VHUB_IRQ_DEVICE4 |
> -		     VHUB_IRQ_DEVICE5)) {
> -		if (istat & VHUB_IRQ_DEVICE1)
> -			ast_vhub_dev_irq(&vhub->ports[0].dev);
> -		if (istat & VHUB_IRQ_DEVICE2)
> -			ast_vhub_dev_irq(&vhub->ports[1].dev);
> -		if (istat & VHUB_IRQ_DEVICE3)
> -			ast_vhub_dev_irq(&vhub->ports[2].dev);
> -		if (istat & VHUB_IRQ_DEVICE4)
> -			ast_vhub_dev_irq(&vhub->ports[3].dev);
> -		if (istat & VHUB_IRQ_DEVICE5)
> -			ast_vhub_dev_irq(&vhub->ports[4].dev);
> +	for (i = 0; i < vhub->max_ports; i++) {
> +		u32 dev_mask = VHUB_IRQ_DEVICE1 << i;
> +
> +		if (istat & dev_mask)
> +			ast_vhub_dev_irq(&vhub->ports[i].dev);
>  	}
>  
>  	/* Handle top-level vHub EP0 interrupts */
> @@ -182,7 +172,7 @@ static irqreturn_t ast_vhub_irq(int irq, void *data)
>  
>  void ast_vhub_init_hw(struct ast_vhub *vhub)
>  {
> -	u32 ctrl;
> +	u32 ctrl, port_mask, epn_mask;
>  
>  	UDCDBG(vhub,"(Re)Starting HW ...\n");
>  
> @@ -222,15 +212,20 @@ void ast_vhub_init_hw(struct ast_vhub *vhub)
>  	}
>  
>  	/* Reset all devices */
> -	writel(VHUB_SW_RESET_ALL, vhub->regs + AST_VHUB_SW_RESET);
> +	port_mask = GENMASK(vhub->max_ports, 1);
> +	writel(VHUB_SW_RESET_ROOT_HUB |
> +	       VHUB_SW_RESET_DMA_CONTROLLER |
> +	       VHUB_SW_RESET_EP_POOL |
> +	       port_mask, vhub->regs + AST_VHUB_SW_RESET);
>  	udelay(1);
>  	writel(0, vhub->regs + AST_VHUB_SW_RESET);
>  
>  	/* Disable and cleanup EP ACK/NACK interrupts */
> +	epn_mask = GENMASK(vhub->max_epns - 1, 0);
>  	writel(0, vhub->regs + AST_VHUB_EP_ACK_IER);
>  	writel(0, vhub->regs + AST_VHUB_EP_NACK_IER);
> -	writel(VHUB_EP_IRQ_ALL, vhub->regs + AST_VHUB_EP_ACK_ISR);
> -	writel(VHUB_EP_IRQ_ALL, vhub->regs + AST_VHUB_EP_NACK_ISR);
> +	writel(epn_mask, vhub->regs + AST_VHUB_EP_ACK_ISR);
> +	writel(epn_mask, vhub->regs + AST_VHUB_EP_NACK_ISR);
>  
>  	/* Default settings for EP0, enable HW hub EP1 */
>  	writel(0, vhub->regs + AST_VHUB_EP0_CTRL);
> @@ -273,7 +268,7 @@ static int ast_vhub_remove(struct platform_device *pdev)
>  		return 0;
>  
>  	/* Remove devices */
> -	for (i = 0; i < AST_VHUB_NUM_PORTS; i++)
> +	for (i = 0; i < vhub->max_ports; i++)
>  		ast_vhub_del_dev(&vhub->ports[i].dev);
>  
>  	spin_lock_irqsave(&vhub->lock, flags);
> @@ -295,7 +290,7 @@ static int ast_vhub_remove(struct platform_device *pdev)
>  	if (vhub->ep0_bufs)
>  		dma_free_coherent(&pdev->dev,
>  				  AST_VHUB_EP0_MAX_PACKET *
> -				  (AST_VHUB_NUM_PORTS + 1),
> +				  (vhub->max_ports + 1),
>  				  vhub->ep0_bufs,
>  				  vhub->ep0_bufs_dma);
>  	vhub->ep0_bufs = NULL;
> @@ -309,11 +304,32 @@ static int ast_vhub_probe(struct platform_device *pdev)
>  	struct ast_vhub *vhub;
>  	struct resource *res;
>  	int i, rc = 0;
> +	const struct device_node *np = pdev->dev.of_node;
>  
>  	vhub = devm_kzalloc(&pdev->dev, sizeof(*vhub), GFP_KERNEL);
>  	if (!vhub)
>  		return -ENOMEM;
>  
> +	rc = of_property_read_u32(np, "aspeed,vhub-downstream-ports",
> +				  &vhub->max_ports);
> +	if (rc < 0)
> +		return -ENODEV;

This breaks the driver for old devicetrees, or at the very least,
devicetrees without your subsequent two patches in the series.

I feel we shouldn't drop the built-in values for the 2400 and 2500, that
way we can fall back to them if the devicetree properties aren't present.

For the 2600 we can have a clean break and require the properties be
present (i.e. not hardcode the values in the driver for fallback) as there
aren't yet any devicetrees describing the device.

Andrew
Tao Ren Feb. 18, 2020, 3:18 a.m. UTC | #2
Hi Andrew,

On Mon, Feb 17, 2020 at 10:18:11AM +1030, Andrew Jeffery wrote:
> 
> 
> On Thu, 13 Feb 2020, at 08:27, rentao.bupt@gmail.com wrote:
> > From: Tao Ren <rentao.bupt@gmail.com>
> > 
> > The patch introduces 2 DT properties ("aspeed,vhub-downstream-ports" and
> > "aspeed,vhub-generic-endpoints") which replaces hardcoded port/endpoint
> > number. It is to make it more convenient to add support for newer vhub
> > revisions with different number of ports and endpoints.
> > 
> > Signed-off-by: Tao Ren <rentao.bupt@gmail.com>
> > Reviewed-by: Joel Stanley <joel@jms.id.au>
> > ---
> >  Changes in v2:
> >    - removed ast_vhub_config structure and moved vhub port/endpoint
> >      number into device tree.
> > 
> >  drivers/usb/gadget/udc/aspeed-vhub/core.c | 68 ++++++++++++++---------
> >  drivers/usb/gadget/udc/aspeed-vhub/dev.c  | 30 +++++++---
> >  drivers/usb/gadget/udc/aspeed-vhub/epn.c  |  4 +-
> >  drivers/usb/gadget/udc/aspeed-vhub/hub.c  | 26 ++++++---
> >  drivers/usb/gadget/udc/aspeed-vhub/vhub.h | 23 +++-----
> >  5 files changed, 91 insertions(+), 60 deletions(-)
> > 
> > diff --git a/drivers/usb/gadget/udc/aspeed-vhub/core.c 
> > b/drivers/usb/gadget/udc/aspeed-vhub/core.c
> > index 90b134d5dca9..d6f737fac4e2 100644
> > --- a/drivers/usb/gadget/udc/aspeed-vhub/core.c
> > +++ b/drivers/usb/gadget/udc/aspeed-vhub/core.c
> > @@ -99,7 +99,7 @@ static irqreturn_t ast_vhub_irq(int irq, void *data)
> >  {
> >  	struct ast_vhub *vhub = data;
> >  	irqreturn_t iret = IRQ_NONE;
> > -	u32 istat;
> > +	u32 i, istat;
> >  
> >  	/* Stale interrupt while tearing down */
> >  	if (!vhub->ep0_bufs)
> > @@ -121,10 +121,10 @@ static irqreturn_t ast_vhub_irq(int irq, void *data)
> >  
> >  	/* Handle generic EPs first */
> >  	if (istat & VHUB_IRQ_EP_POOL_ACK_STALL) {
> > -		u32 i, ep_acks = readl(vhub->regs + AST_VHUB_EP_ACK_ISR);
> > +		u32 ep_acks = readl(vhub->regs + AST_VHUB_EP_ACK_ISR);
> >  		writel(ep_acks, vhub->regs + AST_VHUB_EP_ACK_ISR);
> >  
> > -		for (i = 0; ep_acks && i < AST_VHUB_NUM_GEN_EPs; i++) {
> > +		for (i = 0; ep_acks && i < vhub->max_epns; i++) {
> >  			u32 mask = VHUB_EP_IRQ(i);
> >  			if (ep_acks & mask) {
> >  				ast_vhub_epn_ack_irq(&vhub->epns[i]);
> > @@ -134,21 +134,11 @@ static irqreturn_t ast_vhub_irq(int irq, void *data)
> >  	}
> >  
> >  	/* Handle device interrupts */
> > -	if (istat & (VHUB_IRQ_DEVICE1 |
> > -		     VHUB_IRQ_DEVICE2 |
> > -		     VHUB_IRQ_DEVICE3 |
> > -		     VHUB_IRQ_DEVICE4 |
> > -		     VHUB_IRQ_DEVICE5)) {
> > -		if (istat & VHUB_IRQ_DEVICE1)
> > -			ast_vhub_dev_irq(&vhub->ports[0].dev);
> > -		if (istat & VHUB_IRQ_DEVICE2)
> > -			ast_vhub_dev_irq(&vhub->ports[1].dev);
> > -		if (istat & VHUB_IRQ_DEVICE3)
> > -			ast_vhub_dev_irq(&vhub->ports[2].dev);
> > -		if (istat & VHUB_IRQ_DEVICE4)
> > -			ast_vhub_dev_irq(&vhub->ports[3].dev);
> > -		if (istat & VHUB_IRQ_DEVICE5)
> > -			ast_vhub_dev_irq(&vhub->ports[4].dev);
> > +	for (i = 0; i < vhub->max_ports; i++) {
> > +		u32 dev_mask = VHUB_IRQ_DEVICE1 << i;
> > +
> > +		if (istat & dev_mask)
> > +			ast_vhub_dev_irq(&vhub->ports[i].dev);
> >  	}
> >  
> >  	/* Handle top-level vHub EP0 interrupts */
> > @@ -182,7 +172,7 @@ static irqreturn_t ast_vhub_irq(int irq, void *data)
> >  
> >  void ast_vhub_init_hw(struct ast_vhub *vhub)
> >  {
> > -	u32 ctrl;
> > +	u32 ctrl, port_mask, epn_mask;
> >  
> >  	UDCDBG(vhub,"(Re)Starting HW ...\n");
> >  
> > @@ -222,15 +212,20 @@ void ast_vhub_init_hw(struct ast_vhub *vhub)
> >  	}
> >  
> >  	/* Reset all devices */
> > -	writel(VHUB_SW_RESET_ALL, vhub->regs + AST_VHUB_SW_RESET);
> > +	port_mask = GENMASK(vhub->max_ports, 1);
> > +	writel(VHUB_SW_RESET_ROOT_HUB |
> > +	       VHUB_SW_RESET_DMA_CONTROLLER |
> > +	       VHUB_SW_RESET_EP_POOL |
> > +	       port_mask, vhub->regs + AST_VHUB_SW_RESET);
> >  	udelay(1);
> >  	writel(0, vhub->regs + AST_VHUB_SW_RESET);
> >  
> >  	/* Disable and cleanup EP ACK/NACK interrupts */
> > +	epn_mask = GENMASK(vhub->max_epns - 1, 0);
> >  	writel(0, vhub->regs + AST_VHUB_EP_ACK_IER);
> >  	writel(0, vhub->regs + AST_VHUB_EP_NACK_IER);
> > -	writel(VHUB_EP_IRQ_ALL, vhub->regs + AST_VHUB_EP_ACK_ISR);
> > -	writel(VHUB_EP_IRQ_ALL, vhub->regs + AST_VHUB_EP_NACK_ISR);
> > +	writel(epn_mask, vhub->regs + AST_VHUB_EP_ACK_ISR);
> > +	writel(epn_mask, vhub->regs + AST_VHUB_EP_NACK_ISR);
> >  
> >  	/* Default settings for EP0, enable HW hub EP1 */
> >  	writel(0, vhub->regs + AST_VHUB_EP0_CTRL);
> > @@ -273,7 +268,7 @@ static int ast_vhub_remove(struct platform_device *pdev)
> >  		return 0;
> >  
> >  	/* Remove devices */
> > -	for (i = 0; i < AST_VHUB_NUM_PORTS; i++)
> > +	for (i = 0; i < vhub->max_ports; i++)
> >  		ast_vhub_del_dev(&vhub->ports[i].dev);
> >  
> >  	spin_lock_irqsave(&vhub->lock, flags);
> > @@ -295,7 +290,7 @@ static int ast_vhub_remove(struct platform_device *pdev)
> >  	if (vhub->ep0_bufs)
> >  		dma_free_coherent(&pdev->dev,
> >  				  AST_VHUB_EP0_MAX_PACKET *
> > -				  (AST_VHUB_NUM_PORTS + 1),
> > +				  (vhub->max_ports + 1),
> >  				  vhub->ep0_bufs,
> >  				  vhub->ep0_bufs_dma);
> >  	vhub->ep0_bufs = NULL;
> > @@ -309,11 +304,32 @@ static int ast_vhub_probe(struct platform_device *pdev)
> >  	struct ast_vhub *vhub;
> >  	struct resource *res;
> >  	int i, rc = 0;
> > +	const struct device_node *np = pdev->dev.of_node;
> >  
> >  	vhub = devm_kzalloc(&pdev->dev, sizeof(*vhub), GFP_KERNEL);
> >  	if (!vhub)
> >  		return -ENOMEM;
> >  
> > +	rc = of_property_read_u32(np, "aspeed,vhub-downstream-ports",
> > +				  &vhub->max_ports);
> > +	if (rc < 0)
> > +		return -ENODEV;
> 
> This breaks the driver for old devicetrees, or at the very least,
> devicetrees without your subsequent two patches in the series.
> 
> I feel we shouldn't drop the built-in values for the 2400 and 2500, that
> way we can fall back to them if the devicetree properties aren't present.
> 
> For the 2600 we can have a clean break and require the properties be
> present (i.e. not hardcode the values in the driver for fallback) as there
> aren't yet any devicetrees describing the device.
> 
> Andrew

I understand it. I was also hesitating whether we should make the DT
properties mandatory.. I've sent out patch v3 which falls back to
"default" number of ports and endpoints in case the DT properties are
not present.


Cheers,

Tao

Patch
diff mbox series

diff --git a/drivers/usb/gadget/udc/aspeed-vhub/core.c b/drivers/usb/gadget/udc/aspeed-vhub/core.c
index 90b134d5dca9..d6f737fac4e2 100644
--- a/drivers/usb/gadget/udc/aspeed-vhub/core.c
+++ b/drivers/usb/gadget/udc/aspeed-vhub/core.c
@@ -99,7 +99,7 @@  static irqreturn_t ast_vhub_irq(int irq, void *data)
 {
 	struct ast_vhub *vhub = data;
 	irqreturn_t iret = IRQ_NONE;
-	u32 istat;
+	u32 i, istat;
 
 	/* Stale interrupt while tearing down */
 	if (!vhub->ep0_bufs)
@@ -121,10 +121,10 @@  static irqreturn_t ast_vhub_irq(int irq, void *data)
 
 	/* Handle generic EPs first */
 	if (istat & VHUB_IRQ_EP_POOL_ACK_STALL) {
-		u32 i, ep_acks = readl(vhub->regs + AST_VHUB_EP_ACK_ISR);
+		u32 ep_acks = readl(vhub->regs + AST_VHUB_EP_ACK_ISR);
 		writel(ep_acks, vhub->regs + AST_VHUB_EP_ACK_ISR);
 
-		for (i = 0; ep_acks && i < AST_VHUB_NUM_GEN_EPs; i++) {
+		for (i = 0; ep_acks && i < vhub->max_epns; i++) {
 			u32 mask = VHUB_EP_IRQ(i);
 			if (ep_acks & mask) {
 				ast_vhub_epn_ack_irq(&vhub->epns[i]);
@@ -134,21 +134,11 @@  static irqreturn_t ast_vhub_irq(int irq, void *data)
 	}
 
 	/* Handle device interrupts */
-	if (istat & (VHUB_IRQ_DEVICE1 |
-		     VHUB_IRQ_DEVICE2 |
-		     VHUB_IRQ_DEVICE3 |
-		     VHUB_IRQ_DEVICE4 |
-		     VHUB_IRQ_DEVICE5)) {
-		if (istat & VHUB_IRQ_DEVICE1)
-			ast_vhub_dev_irq(&vhub->ports[0].dev);
-		if (istat & VHUB_IRQ_DEVICE2)
-			ast_vhub_dev_irq(&vhub->ports[1].dev);
-		if (istat & VHUB_IRQ_DEVICE3)
-			ast_vhub_dev_irq(&vhub->ports[2].dev);
-		if (istat & VHUB_IRQ_DEVICE4)
-			ast_vhub_dev_irq(&vhub->ports[3].dev);
-		if (istat & VHUB_IRQ_DEVICE5)
-			ast_vhub_dev_irq(&vhub->ports[4].dev);
+	for (i = 0; i < vhub->max_ports; i++) {
+		u32 dev_mask = VHUB_IRQ_DEVICE1 << i;
+
+		if (istat & dev_mask)
+			ast_vhub_dev_irq(&vhub->ports[i].dev);
 	}
 
 	/* Handle top-level vHub EP0 interrupts */
@@ -182,7 +172,7 @@  static irqreturn_t ast_vhub_irq(int irq, void *data)
 
 void ast_vhub_init_hw(struct ast_vhub *vhub)
 {
-	u32 ctrl;
+	u32 ctrl, port_mask, epn_mask;
 
 	UDCDBG(vhub,"(Re)Starting HW ...\n");
 
@@ -222,15 +212,20 @@  void ast_vhub_init_hw(struct ast_vhub *vhub)
 	}
 
 	/* Reset all devices */
-	writel(VHUB_SW_RESET_ALL, vhub->regs + AST_VHUB_SW_RESET);
+	port_mask = GENMASK(vhub->max_ports, 1);
+	writel(VHUB_SW_RESET_ROOT_HUB |
+	       VHUB_SW_RESET_DMA_CONTROLLER |
+	       VHUB_SW_RESET_EP_POOL |
+	       port_mask, vhub->regs + AST_VHUB_SW_RESET);
 	udelay(1);
 	writel(0, vhub->regs + AST_VHUB_SW_RESET);
 
 	/* Disable and cleanup EP ACK/NACK interrupts */
+	epn_mask = GENMASK(vhub->max_epns - 1, 0);
 	writel(0, vhub->regs + AST_VHUB_EP_ACK_IER);
 	writel(0, vhub->regs + AST_VHUB_EP_NACK_IER);
-	writel(VHUB_EP_IRQ_ALL, vhub->regs + AST_VHUB_EP_ACK_ISR);
-	writel(VHUB_EP_IRQ_ALL, vhub->regs + AST_VHUB_EP_NACK_ISR);
+	writel(epn_mask, vhub->regs + AST_VHUB_EP_ACK_ISR);
+	writel(epn_mask, vhub->regs + AST_VHUB_EP_NACK_ISR);
 
 	/* Default settings for EP0, enable HW hub EP1 */
 	writel(0, vhub->regs + AST_VHUB_EP0_CTRL);
@@ -273,7 +268,7 @@  static int ast_vhub_remove(struct platform_device *pdev)
 		return 0;
 
 	/* Remove devices */
-	for (i = 0; i < AST_VHUB_NUM_PORTS; i++)
+	for (i = 0; i < vhub->max_ports; i++)
 		ast_vhub_del_dev(&vhub->ports[i].dev);
 
 	spin_lock_irqsave(&vhub->lock, flags);
@@ -295,7 +290,7 @@  static int ast_vhub_remove(struct platform_device *pdev)
 	if (vhub->ep0_bufs)
 		dma_free_coherent(&pdev->dev,
 				  AST_VHUB_EP0_MAX_PACKET *
-				  (AST_VHUB_NUM_PORTS + 1),
+				  (vhub->max_ports + 1),
 				  vhub->ep0_bufs,
 				  vhub->ep0_bufs_dma);
 	vhub->ep0_bufs = NULL;
@@ -309,11 +304,32 @@  static int ast_vhub_probe(struct platform_device *pdev)
 	struct ast_vhub *vhub;
 	struct resource *res;
 	int i, rc = 0;
+	const struct device_node *np = pdev->dev.of_node;
 
 	vhub = devm_kzalloc(&pdev->dev, sizeof(*vhub), GFP_KERNEL);
 	if (!vhub)
 		return -ENOMEM;
 
+	rc = of_property_read_u32(np, "aspeed,vhub-downstream-ports",
+				  &vhub->max_ports);
+	if (rc < 0)
+		return -ENODEV;
+
+	vhub->ports = devm_kcalloc(&pdev->dev, vhub->max_ports,
+				   sizeof(*vhub->ports), GFP_KERNEL);
+	if (!vhub->ports)
+		return -ENOMEM;
+
+	rc = of_property_read_u32(np, "aspeed,vhub-generic-endpoints",
+				  &vhub->max_epns);
+	if (rc < 0)
+		return -ENODEV;
+
+	vhub->epns = devm_kcalloc(&pdev->dev, vhub->max_epns,
+				  sizeof(*vhub->epns), GFP_KERNEL);
+	if (!vhub->epns)
+		return -ENOMEM;
+
 	spin_lock_init(&vhub->lock);
 	vhub->pdev = pdev;
 
@@ -366,7 +382,7 @@  static int ast_vhub_probe(struct platform_device *pdev)
 	 */
 	vhub->ep0_bufs = dma_alloc_coherent(&pdev->dev,
 					    AST_VHUB_EP0_MAX_PACKET *
-					    (AST_VHUB_NUM_PORTS + 1),
+					    (vhub->max_ports + 1),
 					    &vhub->ep0_bufs_dma, GFP_KERNEL);
 	if (!vhub->ep0_bufs) {
 		dev_err(&pdev->dev, "Failed to allocate EP0 DMA buffers\n");
@@ -380,7 +396,7 @@  static int ast_vhub_probe(struct platform_device *pdev)
 	ast_vhub_init_ep0(vhub, &vhub->ep0, NULL);
 
 	/* Init devices */
-	for (i = 0; i < AST_VHUB_NUM_PORTS && rc == 0; i++)
+	for (i = 0; i < vhub->max_ports && rc == 0; i++)
 		rc = ast_vhub_init_dev(vhub, i);
 	if (rc)
 		goto err;
diff --git a/drivers/usb/gadget/udc/aspeed-vhub/dev.c b/drivers/usb/gadget/udc/aspeed-vhub/dev.c
index 4008e7a51188..d268306a7bfe 100644
--- a/drivers/usb/gadget/udc/aspeed-vhub/dev.c
+++ b/drivers/usb/gadget/udc/aspeed-vhub/dev.c
@@ -77,7 +77,7 @@  static void ast_vhub_dev_enable(struct ast_vhub_dev *d)
 	writel(d->ep0.buf_dma, d->regs + AST_VHUB_DEV_EP0_DATA);
 
 	/* Clear stall on all EPs */
-	for (i = 0; i < AST_VHUB_NUM_GEN_EPs; i++) {
+	for (i = 0; i < d->max_epns; i++) {
 		struct ast_vhub_ep *ep = d->epns[i];
 
 		if (ep && (ep->epn.stalled || ep->epn.wedged)) {
@@ -137,7 +137,7 @@  static int ast_vhub_ep_feature(struct ast_vhub_dev *d,
 	     is_set ? "SET" : "CLEAR", ep_num, wValue);
 	if (ep_num == 0)
 		return std_req_complete;
-	if (ep_num >= AST_VHUB_NUM_GEN_EPs || !d->epns[ep_num - 1])
+	if (ep_num >= d->max_epns || !d->epns[ep_num - 1])
 		return std_req_stall;
 	if (wValue != USB_ENDPOINT_HALT)
 		return std_req_driver;
@@ -181,7 +181,7 @@  static int ast_vhub_ep_status(struct ast_vhub_dev *d,
 
 	DDBG(d, "GET_STATUS(ep%d)\n", ep_num);
 
-	if (ep_num >= AST_VHUB_NUM_GEN_EPs)
+	if (ep_num >= d->max_epns)
 		return std_req_stall;
 	if (ep_num != 0) {
 		ep = d->epns[ep_num - 1];
@@ -299,7 +299,7 @@  static void ast_vhub_dev_nuke(struct ast_vhub_dev *d)
 {
 	unsigned int i;
 
-	for (i = 0; i < AST_VHUB_NUM_GEN_EPs; i++) {
+	for (i = 0; i < d->max_epns; i++) {
 		if (!d->epns[i])
 			continue;
 		ast_vhub_nuke(d->epns[i], -ESHUTDOWN);
@@ -416,10 +416,10 @@  static struct usb_ep *ast_vhub_udc_match_ep(struct usb_gadget *gadget,
 	 * that will allow the generic code to use our
 	 * assigned address.
 	 */
-	for (i = 0; i < AST_VHUB_NUM_GEN_EPs; i++)
+	for (i = 0; i < d->max_epns; i++)
 		if (d->epns[i] == NULL)
 			break;
-	if (i >= AST_VHUB_NUM_GEN_EPs)
+	if (i >= d->max_epns)
 		return NULL;
 	addr = i + 1;
 
@@ -526,6 +526,7 @@  void ast_vhub_del_dev(struct ast_vhub_dev *d)
 
 	usb_del_gadget_udc(&d->gadget);
 	device_unregister(d->port_dev);
+	kfree(d->epns);
 }
 
 static void ast_vhub_dev_release(struct device *dev)
@@ -546,14 +547,25 @@  int ast_vhub_init_dev(struct ast_vhub *vhub, unsigned int idx)
 
 	ast_vhub_init_ep0(vhub, &d->ep0, d);
 
+	/*
+	 * A USB device can have up to 30 endpoints besides control
+	 * endpoint 0.
+	 */
+	d->max_epns = min_t(u32, vhub->max_epns, 30);
+	d->epns = kcalloc(d->max_epns, sizeof(*d->epns), GFP_KERNEL);
+	if (!d->epns)
+		return -ENOMEM;
+
 	/*
 	 * The UDC core really needs us to have separate and uniquely
 	 * named "parent" devices for each port so we create a sub device
 	 * here for that purpose
 	 */
 	d->port_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
-	if (!d->port_dev)
-		return -ENOMEM;
+	if (!d->port_dev) {
+		rc = -ENOMEM;
+		goto fail_alloc;
+	}
 	device_initialize(d->port_dev);
 	d->port_dev->release = ast_vhub_dev_release;
 	d->port_dev->parent = parent;
@@ -584,6 +596,8 @@  int ast_vhub_init_dev(struct ast_vhub *vhub, unsigned int idx)
 	device_del(d->port_dev);
  fail_add:
 	put_device(d->port_dev);
+ fail_alloc:
+	kfree(d->epns);
 
 	return rc;
 }
diff --git a/drivers/usb/gadget/udc/aspeed-vhub/epn.c b/drivers/usb/gadget/udc/aspeed-vhub/epn.c
index 7475c74aa5c5..0bd6b20435b8 100644
--- a/drivers/usb/gadget/udc/aspeed-vhub/epn.c
+++ b/drivers/usb/gadget/udc/aspeed-vhub/epn.c
@@ -800,10 +800,10 @@  struct ast_vhub_ep *ast_vhub_alloc_epn(struct ast_vhub_dev *d, u8 addr)
 
 	/* Find a free one (no device) */
 	spin_lock_irqsave(&vhub->lock, flags);
-	for (i = 0; i < AST_VHUB_NUM_GEN_EPs; i++)
+	for (i = 0; i < vhub->max_epns; i++)
 		if (vhub->epns[i].dev == NULL)
 			break;
-	if (i >= AST_VHUB_NUM_GEN_EPs) {
+	if (i >= vhub->max_epns) {
 		spin_unlock_irqrestore(&vhub->lock, flags);
 		return NULL;
 	}
diff --git a/drivers/usb/gadget/udc/aspeed-vhub/hub.c b/drivers/usb/gadget/udc/aspeed-vhub/hub.c
index 19b3517e04c0..9c7e57fbd8ef 100644
--- a/drivers/usb/gadget/udc/aspeed-vhub/hub.c
+++ b/drivers/usb/gadget/udc/aspeed-vhub/hub.c
@@ -133,10 +133,13 @@  static const struct ast_vhub_full_cdesc {
 
 #define AST_VHUB_HUB_DESC_SIZE	(USB_DT_HUB_NONVAR_SIZE + 2)
 
-static const struct usb_hub_descriptor ast_vhub_hub_desc = {
+/*
+ * "bNbrPorts" field is updated in "ast_vhub_init_hub" function based on
+ * "max_ports" of the vhub.
+ */
+static struct usb_hub_descriptor ast_vhub_hub_desc = {
 	.bDescLength			= AST_VHUB_HUB_DESC_SIZE,
 	.bDescriptorType		= USB_DT_HUB,
-	.bNbrPorts			= AST_VHUB_NUM_PORTS,
 	.wHubCharacteristics		= cpu_to_le16(HUB_CHAR_NO_LPSM),
 	.bPwrOn2PwrGood			= 10,
 	.bHubContrCurrent		= 0,
@@ -504,7 +507,7 @@  static void ast_vhub_wake_work(struct work_struct *work)
 	 * we let the normal host wake path deal with it later.
 	 */
 	spin_lock_irqsave(&vhub->lock, flags);
-	for (i = 0; i < AST_VHUB_NUM_PORTS; i++) {
+	for (i = 0; i < vhub->max_ports; i++) {
 		struct ast_vhub_port *p = &vhub->ports[i];
 
 		if (!(p->status & USB_PORT_STAT_SUSPEND))
@@ -587,7 +590,7 @@  static enum std_req_rc ast_vhub_set_port_feature(struct ast_vhub_ep *ep,
 	struct ast_vhub *vhub = ep->vhub;
 	struct ast_vhub_port *p;
 
-	if (port == 0 || port > AST_VHUB_NUM_PORTS)
+	if (port == 0 || port > vhub->max_ports)
 		return std_req_stall;
 	port--;
 	p = &vhub->ports[port];
@@ -630,7 +633,7 @@  static enum std_req_rc ast_vhub_clr_port_feature(struct ast_vhub_ep *ep,
 	struct ast_vhub *vhub = ep->vhub;
 	struct ast_vhub_port *p;
 
-	if (port == 0 || port > AST_VHUB_NUM_PORTS)
+	if (port == 0 || port > vhub->max_ports)
 		return std_req_stall;
 	port--;
 	p = &vhub->ports[port];
@@ -676,7 +679,7 @@  static enum std_req_rc ast_vhub_get_port_stat(struct ast_vhub_ep *ep,
 	struct ast_vhub *vhub = ep->vhub;
 	u16 stat, chg;
 
-	if (port == 0 || port > AST_VHUB_NUM_PORTS)
+	if (port == 0 || port > vhub->max_ports)
 		return std_req_stall;
 	port--;
 
@@ -757,7 +760,7 @@  void ast_vhub_hub_suspend(struct ast_vhub *vhub)
 	 * Forward to unsuspended ports without changing
 	 * their connection status.
 	 */
-	for (i = 0; i < AST_VHUB_NUM_PORTS; i++) {
+	for (i = 0; i < vhub->max_ports; i++) {
 		struct ast_vhub_port *p = &vhub->ports[i];
 
 		if (!(p->status & USB_PORT_STAT_SUSPEND))
@@ -780,7 +783,7 @@  void ast_vhub_hub_resume(struct ast_vhub *vhub)
 	 * Forward to unsuspended ports without changing
 	 * their connection status.
 	 */
-	for (i = 0; i < AST_VHUB_NUM_PORTS; i++) {
+	for (i = 0; i < vhub->max_ports; i++) {
 		struct ast_vhub_port *p = &vhub->ports[i];
 
 		if (!(p->status & USB_PORT_STAT_SUSPEND))
@@ -814,7 +817,7 @@  void ast_vhub_hub_reset(struct ast_vhub *vhub)
 	 * Clear all port status, disable gadgets and "suspend"
 	 * them. They will be woken up by a port reset.
 	 */
-	for (i = 0; i < AST_VHUB_NUM_PORTS; i++) {
+	for (i = 0; i < vhub->max_ports; i++) {
 		struct ast_vhub_port *p = &vhub->ports[i];
 
 		/* Only keep the connected flag */
@@ -838,5 +841,10 @@  void ast_vhub_init_hub(struct ast_vhub *vhub)
 {
 	vhub->speed = USB_SPEED_UNKNOWN;
 	INIT_WORK(&vhub->wake_work, ast_vhub_wake_work);
+
+	/*
+	 * Fixup number of ports in hub descriptor.
+	 */
+	ast_vhub_hub_desc.bNbrPorts = vhub->max_ports;
 }
 
diff --git a/drivers/usb/gadget/udc/aspeed-vhub/vhub.h b/drivers/usb/gadget/udc/aspeed-vhub/vhub.h
index 761919e220d3..e46980fe66f2 100644
--- a/drivers/usb/gadget/udc/aspeed-vhub/vhub.h
+++ b/drivers/usb/gadget/udc/aspeed-vhub/vhub.h
@@ -76,17 +76,9 @@ 
 #define VHUB_SW_RESET_DEVICE2			(1 << 2)
 #define VHUB_SW_RESET_DEVICE1			(1 << 1)
 #define VHUB_SW_RESET_ROOT_HUB			(1 << 0)
-#define VHUB_SW_RESET_ALL			(VHUB_SW_RESET_EP_POOL | \
-						 VHUB_SW_RESET_DMA_CONTROLLER | \
-						 VHUB_SW_RESET_DEVICE5 | \
-						 VHUB_SW_RESET_DEVICE4 | \
-						 VHUB_SW_RESET_DEVICE3 | \
-						 VHUB_SW_RESET_DEVICE2 | \
-						 VHUB_SW_RESET_DEVICE1 | \
-						 VHUB_SW_RESET_ROOT_HUB)
+
 /* EP ACK/NACK IRQ masks */
 #define VHUB_EP_IRQ(n)				(1 << (n))
-#define VHUB_EP_IRQ_ALL				0x7fff	/* 15 EPs */
 
 /* USB status reg */
 #define VHUB_USBSTS_HISPEED			(1 << 27)
@@ -210,8 +202,6 @@ 
  *                                      *
  ****************************************/
 
-#define AST_VHUB_NUM_GEN_EPs	15	/* Generic non-0 EPs */
-#define AST_VHUB_NUM_PORTS	5	/* vHub ports */
 #define AST_VHUB_EP0_MAX_PACKET	64	/* EP0's max packet size */
 #define AST_VHUB_EPn_MAX_PACKET	1024	/* Generic EPs max packet size */
 #define AST_VHUB_DESCS_COUNT	256	/* Use 256 descriptor mode (valid
@@ -342,7 +332,7 @@  struct ast_vhub_dev {
 	struct ast_vhub			*vhub;
 	void __iomem			*regs;
 
-	/* Device index (0...4) and name string */
+	/* Device index (zero-based) and name string */
 	unsigned int			index;
 	const char			*name;
 
@@ -358,7 +348,8 @@  struct ast_vhub_dev {
 
 	/* Endpoint structures */
 	struct ast_vhub_ep		ep0;
-	struct ast_vhub_ep		*epns[AST_VHUB_NUM_GEN_EPs];
+	struct ast_vhub_ep		**epns;
+	u32				max_epns;
 
 };
 #define to_ast_dev(__g) container_of(__g, struct ast_vhub_dev, gadget)
@@ -393,10 +384,12 @@  struct ast_vhub {
 	bool				ep1_stalled : 1;
 
 	/* Per-port info */
-	struct ast_vhub_port		ports[AST_VHUB_NUM_PORTS];
+	struct ast_vhub_port		*ports;
+	u32				max_ports;
 
 	/* Generic EP data structures */
-	struct ast_vhub_ep		epns[AST_VHUB_NUM_GEN_EPs];
+	struct ast_vhub_ep		*epns;
+	u32				max_epns;
 
 	/* Upstream bus is suspended ? */
 	bool				suspended : 1;