[PATCH] usb: dwc3: core: continue probe even if usb3 phy is not available

[PATCH] usb: dwc3: core: continue probe even if usb3 phy is not available

[George Cherian]

There can be configurations in which DWC3 is hoooked up only to USB2 PHY.
In such cases we should not return -EPROBE_DEFER, rather continue probe
even if there is no USB3 PHY.

Signed-off-by: George Cherian <george.cherian@ti.com>
---
 drivers/usb/dwc3/core.c | 31 ++++++++++++++++++++++++-------
 1 file changed, 24 insertions(+), 7 deletions(-)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index c35d49d..d5e6f3e 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -100,7 +100,9 @@ static void dwc3_core_soft_reset(struct dwc3 *dwc)
 	dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
 
 	usb_phy_init(dwc->usb2_phy);
-	usb_phy_init(dwc->usb3_phy);
+
+	if (dwc->usb3_phy)
+		usb_phy_init(dwc->usb3_phy);
 	mdelay(100);
 
 	/* Clear USB3 PHY reset */
@@ -360,7 +362,9 @@ err0:
 static void dwc3_core_exit(struct dwc3 *dwc)
 {
 	usb_phy_shutdown(dwc->usb2_phy);
-	usb_phy_shutdown(dwc->usb3_phy);
+
+	if (dwc->usb3_phy)
+		usb_phy_shutdown(dwc->usb3_phy);
 }
 
 #define DWC3_ALIGN_MASK		(16 - 1)
@@ -460,12 +464,19 @@ static int dwc3_probe(struct platform_device *pdev)
 		if (ret == -ENXIO)
 			return ret;
 
+		/*
+		 * In  some cases we wont have a USB3 PHY, in such cases
+		 * if we return EPROBE_DEFER we would never complete the
+		 * probe. Just print error and continue.
+		 */
 		dev_err(dev, "no usb3 phy configured\n");
-		return -EPROBE_DEFER;
+		dwc->usb3_phy = NULL;
 	}
 
 	usb_phy_set_suspend(dwc->usb2_phy, 0);
-	usb_phy_set_suspend(dwc->usb3_phy, 0);
+
+	if (dwc->usb3_phy)
+		usb_phy_set_suspend(dwc->usb3_phy, 0);
 
 	spin_lock_init(&dwc->lock);
 	platform_set_drvdata(pdev, dwc);
@@ -604,7 +615,9 @@ static int dwc3_remove(struct platform_device *pdev)
 	struct dwc3	*dwc = platform_get_drvdata(pdev);
 
 	usb_phy_set_suspend(dwc->usb2_phy, 1);
-	usb_phy_set_suspend(dwc->usb3_phy, 1);
+
+	if (dwc->usb3_phy)
+		usb_phy_set_suspend(dwc->usb3_phy, 1);
 
 	pm_runtime_put(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
@@ -700,7 +713,9 @@ static int dwc3_suspend(struct device *dev)
 	dwc->gctl = dwc3_readl(dwc->regs, DWC3_GCTL);
 	spin_unlock_irqrestore(&dwc->lock, flags);
 
-	usb_phy_shutdown(dwc->usb3_phy);
+	if (dwc->usb3_phy)
+		usb_phy_shutdown(dwc->usb3_phy);
+
 	usb_phy_shutdown(dwc->usb2_phy);
 
 	return 0;
@@ -711,7 +726,9 @@ static int dwc3_resume(struct device *dev)
 	struct dwc3	*dwc = dev_get_drvdata(dev);
 	unsigned long	flags;
 
-	usb_phy_init(dwc->usb3_phy);
+	if (dwc->usb3_phy)
+		usb_phy_init(dwc->usb3_phy);
+
 	usb_phy_init(dwc->usb2_phy);
 	msleep(100);
 
-- 
1.8.1.4

[PATCH] usb: dwc3: core: continue probe even if usb3 phy is not available

[George Cherian]

There can be configurations in which DWC3 is hoooked up only to USB2 PHY.
In such cases we should not return -EPROBE_DEFER, rather continue probe
even if there is no USB3 PHY.

Signed-off-by: George Cherian <george.cherian@ti.com>
---
 drivers/usb/dwc3/core.c | 31 ++++++++++++++++++++++++-------
 1 file changed, 24 insertions(+), 7 deletions(-)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index c35d49d..d5e6f3e 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -100,7 +100,9 @@ static void dwc3_core_soft_reset(struct dwc3 *dwc)
 	dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
 
 	usb_phy_init(dwc->usb2_phy);
-	usb_phy_init(dwc->usb3_phy);
+
+	if (dwc->usb3_phy)
+		usb_phy_init(dwc->usb3_phy);
 	mdelay(100);
 
 	/* Clear USB3 PHY reset */
@@ -360,7 +362,9 @@ err0:
 static void dwc3_core_exit(struct dwc3 *dwc)
 {
 	usb_phy_shutdown(dwc->usb2_phy);
-	usb_phy_shutdown(dwc->usb3_phy);
+
+	if (dwc->usb3_phy)
+		usb_phy_shutdown(dwc->usb3_phy);
 }
 
 #define DWC3_ALIGN_MASK		(16 - 1)
@@ -460,12 +464,19 @@ static int dwc3_probe(struct platform_device *pdev)
 		if (ret == -ENXIO)
 			return ret;
 
+		/*
+		 * In  some cases we wont have a USB3 PHY, in such cases
+		 * if we return EPROBE_DEFER we would never complete the
+		 * probe. Just print error and continue.
+		 */
 		dev_err(dev, "no usb3 phy configured\n");
-		return -EPROBE_DEFER;
+		dwc->usb3_phy = NULL;
 	}
 
 	usb_phy_set_suspend(dwc->usb2_phy, 0);
-	usb_phy_set_suspend(dwc->usb3_phy, 0);
+
+	if (dwc->usb3_phy)
+		usb_phy_set_suspend(dwc->usb3_phy, 0);
 
 	spin_lock_init(&dwc->lock);
 	platform_set_drvdata(pdev, dwc);
@@ -604,7 +615,9 @@ static int dwc3_remove(struct platform_device *pdev)
 	struct dwc3	*dwc = platform_get_drvdata(pdev);
 
 	usb_phy_set_suspend(dwc->usb2_phy, 1);
-	usb_phy_set_suspend(dwc->usb3_phy, 1);
+
+	if (dwc->usb3_phy)
+		usb_phy_set_suspend(dwc->usb3_phy, 1);
 
 	pm_runtime_put(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
@@ -700,7 +713,9 @@ static int dwc3_suspend(struct device *dev)
 	dwc->gctl = dwc3_readl(dwc->regs, DWC3_GCTL);
 	spin_unlock_irqrestore(&dwc->lock, flags);
 
-	usb_phy_shutdown(dwc->usb3_phy);
+	if (dwc->usb3_phy)
+		usb_phy_shutdown(dwc->usb3_phy);
+
 	usb_phy_shutdown(dwc->usb2_phy);
 
 	return 0;
@@ -711,7 +726,9 @@ static int dwc3_resume(struct device *dev)
 	struct dwc3	*dwc = dev_get_drvdata(dev);
 	unsigned long	flags;
 
-	usb_phy_init(dwc->usb3_phy);
+	if (dwc->usb3_phy)
+		usb_phy_init(dwc->usb3_phy);
+
 	usb_phy_init(dwc->usb2_phy);
 	msleep(100);
 
-- 
1.8.1.4

Re: [PATCH] usb: dwc3: core: continue probe even if usb3 phy is not available

[Felipe Balbi]

[-- Attachment #1: Type: text/plain, Size: 1708 bytes --]

Hi,

On Wed, Jun 26, 2013 at 02:59:14PM +0530, George Cherian wrote:
> There can be configurations in which DWC3 is hoooked up only to USB2 PHY.
> In such cases we should not return -EPROBE_DEFER, rather continue probe
> even if there is no USB3 PHY.
> 
> Signed-off-by: George Cherian <george.cherian@ti.com>
> ---
>  drivers/usb/dwc3/core.c | 31 ++++++++++++++++++++++++-------
>  1 file changed, 24 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index c35d49d..d5e6f3e 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -100,7 +100,9 @@ static void dwc3_core_soft_reset(struct dwc3 *dwc)
>  	dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
>  
>  	usb_phy_init(dwc->usb2_phy);
> -	usb_phy_init(dwc->usb3_phy);
> +
> +	if (dwc->usb3_phy)
> +		usb_phy_init(dwc->usb3_phy);

I would feel more comfortable if you would move our maximum_speed module
parameter to DT with a property such as:

snps,maximum_speed = "highspeed";

then on driver you could:

ret = of_property_read_string(np, "snps,maximum_speed", &maximum_speed);
if (ret < 0)
	bailout();

if (strncmp(maximum_speed, "superspeed", 10) == 0) {
	/* grab USB3 PHY, return EPROBE_DEFER if not found */
	grab_usb3_phy();
}

if ((strncmp(maximum_speed, "highspeed", 9) == 0) ||
	(strncmp(maximum_speed, "fullspeed", 9) == 0) ||
	(strncmp(maximum_speed, "lowspeed", 8) == 0)) {
	/* grab USB2 PHY, return EPROBE_DEFER if not found */
	grab_usb2_phy();
}

this way, we depend solely on setting maximum_speed to highspeed for
AM437x :-)

ps: don't forget to default to superspeed in case no property is passed.

-- 
balbi

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Re: [PATCH] usb: dwc3: core: continue probe even if usb3 phy is not available

[Felipe Balbi]

[-- Attachment #1: Type: text/plain, Size: 1708 bytes --]

Hi,

On Wed, Jun 26, 2013 at 02:59:14PM +0530, George Cherian wrote:
> There can be configurations in which DWC3 is hoooked up only to USB2 PHY.
> In such cases we should not return -EPROBE_DEFER, rather continue probe
> even if there is no USB3 PHY.
> 
> Signed-off-by: George Cherian <george.cherian@ti.com>
> ---
>  drivers/usb/dwc3/core.c | 31 ++++++++++++++++++++++++-------
>  1 file changed, 24 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index c35d49d..d5e6f3e 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -100,7 +100,9 @@ static void dwc3_core_soft_reset(struct dwc3 *dwc)
>  	dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
>  
>  	usb_phy_init(dwc->usb2_phy);
> -	usb_phy_init(dwc->usb3_phy);
> +
> +	if (dwc->usb3_phy)
> +		usb_phy_init(dwc->usb3_phy);

I would feel more comfortable if you would move our maximum_speed module
parameter to DT with a property such as:

snps,maximum_speed = "highspeed";

then on driver you could:

ret = of_property_read_string(np, "snps,maximum_speed", &maximum_speed);
if (ret < 0)
	bailout();

if (strncmp(maximum_speed, "superspeed", 10) == 0) {
	/* grab USB3 PHY, return EPROBE_DEFER if not found */
	grab_usb3_phy();
}

if ((strncmp(maximum_speed, "highspeed", 9) == 0) ||
	(strncmp(maximum_speed, "fullspeed", 9) == 0) ||
	(strncmp(maximum_speed, "lowspeed", 8) == 0)) {
	/* grab USB2 PHY, return EPROBE_DEFER if not found */
	grab_usb2_phy();
}

this way, we depend solely on setting maximum_speed to highspeed for
AM437x :-)

ps: don't forget to default to superspeed in case no property is passed.

-- 
balbi

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Re: [PATCH] usb: dwc3: core: continue probe even if usb3 phy is not available

[George Cherian]

On 6/26/2013 3:46 PM, Felipe Balbi wrote:
> Hi,
>
> On Wed, Jun 26, 2013 at 02:59:14PM +0530, George Cherian wrote:
>> There can be configurations in which DWC3 is hoooked up only to USB2 PHY.
>> In such cases we should not return -EPROBE_DEFER, rather continue probe
>> even if there is no USB3 PHY.
>>
>> Signed-off-by: George Cherian <george.cherian@ti.com>
>> ---
>>   drivers/usb/dwc3/core.c | 31 ++++++++++++++++++++++++-------
>>   1 file changed, 24 insertions(+), 7 deletions(-)
>>
>> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
>> index c35d49d..d5e6f3e 100644
>> --- a/drivers/usb/dwc3/core.c
>> +++ b/drivers/usb/dwc3/core.c
>> @@ -100,7 +100,9 @@ static void dwc3_core_soft_reset(struct dwc3 *dwc)
>>   	dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
>>   
>>   	usb_phy_init(dwc->usb2_phy);
>> -	usb_phy_init(dwc->usb3_phy);
>> +
>> +	if (dwc->usb3_phy)
>> +		usb_phy_init(dwc->usb3_phy);
> I would feel more comfortable if you would move our maximum_speed module
> parameter to DT with a property such as:
>
> snps,maximum_speed = "highspeed";
>
> then on driver you could:
okay
> ret = of_property_read_string(np, "snps,maximum_speed", &maximum_speed);
> if (ret < 0)
> 	bailout();
>
> if (strncmp(maximum_speed, "superspeed", 10) == 0) {
> 	/* grab USB3 PHY, return EPROBE_DEFER if not found */
> 	grab_usb3_phy();
> }
>
> if ((strncmp(maximum_speed, "highspeed", 9) == 0) ||
> 	(strncmp(maximum_speed, "fullspeed", 9) == 0) ||
> 	(strncmp(maximum_speed, "lowspeed", 8) == 0)) {
> 	/* grab USB2 PHY, return EPROBE_DEFER if not found */
> 	grab_usb2_phy();
> }
>
> this way, we depend solely on setting maximum_speed to highspeed for
> AM437x :-)
In dra7xx one instance is superspeed and one instance highspeed.
>
> ps: don't forget to default to superspeed in case no property is passed.
okay
Regards
-George

Re: [PATCH] usb: dwc3: core: continue probe even if usb3 phy is not available

[George Cherian]

On 6/26/2013 3:46 PM, Felipe Balbi wrote:
> Hi,
>
> On Wed, Jun 26, 2013 at 02:59:14PM +0530, George Cherian wrote:
>> There can be configurations in which DWC3 is hoooked up only to USB2 PHY.
>> In such cases we should not return -EPROBE_DEFER, rather continue probe
>> even if there is no USB3 PHY.
>>
>> Signed-off-by: George Cherian <george.cherian@ti.com>
>> ---
>>   drivers/usb/dwc3/core.c | 31 ++++++++++++++++++++++++-------
>>   1 file changed, 24 insertions(+), 7 deletions(-)
>>
>> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
>> index c35d49d..d5e6f3e 100644
>> --- a/drivers/usb/dwc3/core.c
>> +++ b/drivers/usb/dwc3/core.c
>> @@ -100,7 +100,9 @@ static void dwc3_core_soft_reset(struct dwc3 *dwc)
>>   	dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
>>   
>>   	usb_phy_init(dwc->usb2_phy);
>> -	usb_phy_init(dwc->usb3_phy);
>> +
>> +	if (dwc->usb3_phy)
>> +		usb_phy_init(dwc->usb3_phy);
> I would feel more comfortable if you would move our maximum_speed module
> parameter to DT with a property such as:
>
> snps,maximum_speed = "highspeed";
>
> then on driver you could:
okay
> ret = of_property_read_string(np, "snps,maximum_speed", &maximum_speed);
> if (ret < 0)
> 	bailout();
>
> if (strncmp(maximum_speed, "superspeed", 10) == 0) {
> 	/* grab USB3 PHY, return EPROBE_DEFER if not found */
> 	grab_usb3_phy();
> }
>
> if ((strncmp(maximum_speed, "highspeed", 9) == 0) ||
> 	(strncmp(maximum_speed, "fullspeed", 9) == 0) ||
> 	(strncmp(maximum_speed, "lowspeed", 8) == 0)) {
> 	/* grab USB2 PHY, return EPROBE_DEFER if not found */
> 	grab_usb2_phy();
> }
>
> this way, we depend solely on setting maximum_speed to highspeed for
> AM437x :-)
In dra7xx one instance is superspeed and one instance highspeed.
>
> ps: don't forget to default to superspeed in case no property is passed.
okay
Regards
-George

Re: [PATCH] usb: dwc3: core: continue probe even if usb3 phy is not available

[Felipe Balbi]

[-- Attachment #1: Type: text/plain, Size: 2193 bytes --]

On Wed, Jun 26, 2013 at 05:37:19PM +0530, George Cherian wrote:
> On 6/26/2013 3:46 PM, Felipe Balbi wrote:
> >Hi,
> >
> >On Wed, Jun 26, 2013 at 02:59:14PM +0530, George Cherian wrote:
> >>There can be configurations in which DWC3 is hoooked up only to USB2 PHY.
> >>In such cases we should not return -EPROBE_DEFER, rather continue probe
> >>even if there is no USB3 PHY.
> >>
> >>Signed-off-by: George Cherian <george.cherian@ti.com>
> >>---
> >>  drivers/usb/dwc3/core.c | 31 ++++++++++++++++++++++++-------
> >>  1 file changed, 24 insertions(+), 7 deletions(-)
> >>
> >>diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> >>index c35d49d..d5e6f3e 100644
> >>--- a/drivers/usb/dwc3/core.c
> >>+++ b/drivers/usb/dwc3/core.c
> >>@@ -100,7 +100,9 @@ static void dwc3_core_soft_reset(struct dwc3 *dwc)
> >>  	dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
> >>  	usb_phy_init(dwc->usb2_phy);
> >>-	usb_phy_init(dwc->usb3_phy);
> >>+
> >>+	if (dwc->usb3_phy)
> >>+		usb_phy_init(dwc->usb3_phy);
> >I would feel more comfortable if you would move our maximum_speed module
> >parameter to DT with a property such as:
> >
> >snps,maximum_speed = "highspeed";
> >
> >then on driver you could:
> okay
> >ret = of_property_read_string(np, "snps,maximum_speed", &maximum_speed);
> >if (ret < 0)
> >	bailout();
> >
> >if (strncmp(maximum_speed, "superspeed", 10) == 0) {
> >	/* grab USB3 PHY, return EPROBE_DEFER if not found */
> >	grab_usb3_phy();
> >}
> >
> >if ((strncmp(maximum_speed, "highspeed", 9) == 0) ||
> >	(strncmp(maximum_speed, "fullspeed", 9) == 0) ||
> >	(strncmp(maximum_speed, "lowspeed", 8) == 0)) {
> >	/* grab USB2 PHY, return EPROBE_DEFER if not found */
> >	grab_usb2_phy();
> >}
> >
> >this way, we depend solely on setting maximum_speed to highspeed for
> >AM437x :-)
> In dra7xx one instance is superspeed and one instance highspeed.

right, but in DT you will define both instances and each instance will
have a seaparate snps,maximum_speed attribute :-)

I'm now considering if we should make maximum_speed a generic attribute,
Kishon ? Alex ? Alan ?

anyone else needs such thing ?

-- 
balbi

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Re: [PATCH] usb: dwc3: core: continue probe even if usb3 phy is not available

[Felipe Balbi]

[-- Attachment #1: Type: text/plain, Size: 2193 bytes --]

On Wed, Jun 26, 2013 at 05:37:19PM +0530, George Cherian wrote:
> On 6/26/2013 3:46 PM, Felipe Balbi wrote:
> >Hi,
> >
> >On Wed, Jun 26, 2013 at 02:59:14PM +0530, George Cherian wrote:
> >>There can be configurations in which DWC3 is hoooked up only to USB2 PHY.
> >>In such cases we should not return -EPROBE_DEFER, rather continue probe
> >>even if there is no USB3 PHY.
> >>
> >>Signed-off-by: George Cherian <george.cherian@ti.com>
> >>---
> >>  drivers/usb/dwc3/core.c | 31 ++++++++++++++++++++++++-------
> >>  1 file changed, 24 insertions(+), 7 deletions(-)
> >>
> >>diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> >>index c35d49d..d5e6f3e 100644
> >>--- a/drivers/usb/dwc3/core.c
> >>+++ b/drivers/usb/dwc3/core.c
> >>@@ -100,7 +100,9 @@ static void dwc3_core_soft_reset(struct dwc3 *dwc)
> >>  	dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
> >>  	usb_phy_init(dwc->usb2_phy);
> >>-	usb_phy_init(dwc->usb3_phy);
> >>+
> >>+	if (dwc->usb3_phy)
> >>+		usb_phy_init(dwc->usb3_phy);
> >I would feel more comfortable if you would move our maximum_speed module
> >parameter to DT with a property such as:
> >
> >snps,maximum_speed = "highspeed";
> >
> >then on driver you could:
> okay
> >ret = of_property_read_string(np, "snps,maximum_speed", &maximum_speed);
> >if (ret < 0)
> >	bailout();
> >
> >if (strncmp(maximum_speed, "superspeed", 10) == 0) {
> >	/* grab USB3 PHY, return EPROBE_DEFER if not found */
> >	grab_usb3_phy();
> >}
> >
> >if ((strncmp(maximum_speed, "highspeed", 9) == 0) ||
> >	(strncmp(maximum_speed, "fullspeed", 9) == 0) ||
> >	(strncmp(maximum_speed, "lowspeed", 8) == 0)) {
> >	/* grab USB2 PHY, return EPROBE_DEFER if not found */
> >	grab_usb2_phy();
> >}
> >
> >this way, we depend solely on setting maximum_speed to highspeed for
> >AM437x :-)
> In dra7xx one instance is superspeed and one instance highspeed.

right, but in DT you will define both instances and each instance will
have a seaparate snps,maximum_speed attribute :-)

I'm now considering if we should make maximum_speed a generic attribute,
Kishon ? Alex ? Alan ?

anyone else needs such thing ?

-- 
balbi

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[-- Type: application/pgp-signature, Size: 836 bytes --]

Re: [PATCH] usb: dwc3: core: continue probe even if usb3 phy is not available

[Alexander Shishkin]

Felipe Balbi <balbi@ti.com> writes:

> On Wed, Jun 26, 2013 at 05:37:19PM +0530, George Cherian wrote:
>> On 6/26/2013 3:46 PM, Felipe Balbi wrote:
>> >Hi,
>> >
>> >On Wed, Jun 26, 2013 at 02:59:14PM +0530, George Cherian wrote:
>> >>There can be configurations in which DWC3 is hoooked up only to USB2 PHY.
>> >>In such cases we should not return -EPROBE_DEFER, rather continue probe
>> >>even if there is no USB3 PHY.
>> >>
>> >>Signed-off-by: George Cherian <george.cherian@ti.com>
>> >>---
>> >>  drivers/usb/dwc3/core.c | 31 ++++++++++++++++++++++++-------
>> >>  1 file changed, 24 insertions(+), 7 deletions(-)
>> >>
>> >>diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
>> >>index c35d49d..d5e6f3e 100644
>> >>--- a/drivers/usb/dwc3/core.c
>> >>+++ b/drivers/usb/dwc3/core.c
>> >>@@ -100,7 +100,9 @@ static void dwc3_core_soft_reset(struct dwc3 *dwc)
>> >>  	dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
>> >>  	usb_phy_init(dwc->usb2_phy);
>> >>-	usb_phy_init(dwc->usb3_phy);
>> >>+
>> >>+	if (dwc->usb3_phy)
>> >>+		usb_phy_init(dwc->usb3_phy);
>> >I would feel more comfortable if you would move our maximum_speed module
>> >parameter to DT with a property such as:
>> >
>> >snps,maximum_speed = "highspeed";
>> >
>> >then on driver you could:
>> okay
>> >ret = of_property_read_string(np, "snps,maximum_speed", &maximum_speed);
>> >if (ret < 0)
>> >	bailout();
>> >
>> >if (strncmp(maximum_speed, "superspeed", 10) == 0) {
>> >	/* grab USB3 PHY, return EPROBE_DEFER if not found */
>> >	grab_usb3_phy();
>> >}
>> >
>> >if ((strncmp(maximum_speed, "highspeed", 9) == 0) ||
>> >	(strncmp(maximum_speed, "fullspeed", 9) == 0) ||
>> >	(strncmp(maximum_speed, "lowspeed", 8) == 0)) {
>> >	/* grab USB2 PHY, return EPROBE_DEFER if not found */
>> >	grab_usb2_phy();
>> >}
>> >
>> >this way, we depend solely on setting maximum_speed to highspeed for
>> >AM437x :-)
>> In dra7xx one instance is superspeed and one instance highspeed.
>
> right, but in DT you will define both instances and each instance will
> have a seaparate snps,maximum_speed attribute :-)
>
> I'm now considering if we should make maximum_speed a generic attribute,
> Kishon ? Alex ? Alan ?
>
> anyone else needs such thing ?

We have a force-full-speed attibute for chipidea on the way. This
maximum_speed looks like a more generic alternative. Michael, what say
you?

Regards,
--
Alex

Re: [PATCH] usb: dwc3: core: continue probe even if usb3 phy is not available

[Alexander Shishkin]

Felipe Balbi <balbi@ti.com> writes:

> On Wed, Jun 26, 2013 at 05:37:19PM +0530, George Cherian wrote:
>> On 6/26/2013 3:46 PM, Felipe Balbi wrote:
>> >Hi,
>> >
>> >On Wed, Jun 26, 2013 at 02:59:14PM +0530, George Cherian wrote:
>> >>There can be configurations in which DWC3 is hoooked up only to USB2 PHY.
>> >>In such cases we should not return -EPROBE_DEFER, rather continue probe
>> >>even if there is no USB3 PHY.
>> >>
>> >>Signed-off-by: George Cherian <george.cherian@ti.com>
>> >>---
>> >>  drivers/usb/dwc3/core.c | 31 ++++++++++++++++++++++++-------
>> >>  1 file changed, 24 insertions(+), 7 deletions(-)
>> >>
>> >>diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
>> >>index c35d49d..d5e6f3e 100644
>> >>--- a/drivers/usb/dwc3/core.c
>> >>+++ b/drivers/usb/dwc3/core.c
>> >>@@ -100,7 +100,9 @@ static void dwc3_core_soft_reset(struct dwc3 *dwc)
>> >>  	dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
>> >>  	usb_phy_init(dwc->usb2_phy);
>> >>-	usb_phy_init(dwc->usb3_phy);
>> >>+
>> >>+	if (dwc->usb3_phy)
>> >>+		usb_phy_init(dwc->usb3_phy);
>> >I would feel more comfortable if you would move our maximum_speed module
>> >parameter to DT with a property such as:
>> >
>> >snps,maximum_speed = "highspeed";
>> >
>> >then on driver you could:
>> okay
>> >ret = of_property_read_string(np, "snps,maximum_speed", &maximum_speed);
>> >if (ret < 0)
>> >	bailout();
>> >
>> >if (strncmp(maximum_speed, "superspeed", 10) == 0) {
>> >	/* grab USB3 PHY, return EPROBE_DEFER if not found */
>> >	grab_usb3_phy();
>> >}
>> >
>> >if ((strncmp(maximum_speed, "highspeed", 9) == 0) ||
>> >	(strncmp(maximum_speed, "fullspeed", 9) == 0) ||
>> >	(strncmp(maximum_speed, "lowspeed", 8) == 0)) {
>> >	/* grab USB2 PHY, return EPROBE_DEFER if not found */
>> >	grab_usb2_phy();
>> >}
>> >
>> >this way, we depend solely on setting maximum_speed to highspeed for
>> >AM437x :-)
>> In dra7xx one instance is superspeed and one instance highspeed.
>
> right, but in DT you will define both instances and each instance will
> have a seaparate snps,maximum_speed attribute :-)
>
> I'm now considering if we should make maximum_speed a generic attribute,
> Kishon ? Alex ? Alan ?
>
> anyone else needs such thing ?

We have a force-full-speed attibute for chipidea on the way. This
maximum_speed looks like a more generic alternative. Michael, what say
you?

Regards,
--
Alex

Re: [PATCH] usb: dwc3: core: continue probe even if usb3 phy is not available

[Michael Grzeschik]

On Wed, Jun 26, 2013 at 03:46:45PM +0300, Alexander Shishkin wrote:
> Felipe Balbi <balbi@ti.com> writes:
> 
> > On Wed, Jun 26, 2013 at 05:37:19PM +0530, George Cherian wrote:
> >> On 6/26/2013 3:46 PM, Felipe Balbi wrote:
> >> >Hi,
> >> >
> >> >On Wed, Jun 26, 2013 at 02:59:14PM +0530, George Cherian wrote:
> >> >>There can be configurations in which DWC3 is hoooked up only to USB2 PHY.
> >> >>In such cases we should not return -EPROBE_DEFER, rather continue probe
> >> >>even if there is no USB3 PHY.
> >> >>
> >> >>Signed-off-by: George Cherian <george.cherian@ti.com>
> >> >>---
> >> >>  drivers/usb/dwc3/core.c | 31 ++++++++++++++++++++++++-------
> >> >>  1 file changed, 24 insertions(+), 7 deletions(-)
> >> >>
> >> >>diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> >> >>index c35d49d..d5e6f3e 100644
> >> >>--- a/drivers/usb/dwc3/core.c
> >> >>+++ b/drivers/usb/dwc3/core.c
> >> >>@@ -100,7 +100,9 @@ static void dwc3_core_soft_reset(struct dwc3 *dwc)
> >> >>  	dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
> >> >>  	usb_phy_init(dwc->usb2_phy);
> >> >>-	usb_phy_init(dwc->usb3_phy);
> >> >>+
> >> >>+	if (dwc->usb3_phy)
> >> >>+		usb_phy_init(dwc->usb3_phy);
> >> >I would feel more comfortable if you would move our maximum_speed module
> >> >parameter to DT with a property such as:
> >> >
> >> >snps,maximum_speed = "highspeed";
> >> >
> >> >then on driver you could:
> >> okay
> >> >ret = of_property_read_string(np, "snps,maximum_speed", &maximum_speed);
> >> >if (ret < 0)
> >> >	bailout();
> >> >
> >> >if (strncmp(maximum_speed, "superspeed", 10) == 0) {
> >> >	/* grab USB3 PHY, return EPROBE_DEFER if not found */
> >> >	grab_usb3_phy();
> >> >}
> >> >
> >> >if ((strncmp(maximum_speed, "highspeed", 9) == 0) ||
> >> >	(strncmp(maximum_speed, "fullspeed", 9) == 0) ||
> >> >	(strncmp(maximum_speed, "lowspeed", 8) == 0)) {
> >> >	/* grab USB2 PHY, return EPROBE_DEFER if not found */
> >> >	grab_usb2_phy();
> >> >}
> >> >
> >> >this way, we depend solely on setting maximum_speed to highspeed for
> >> >AM437x :-)
> >> In dra7xx one instance is superspeed and one instance highspeed.
> >
> > right, but in DT you will define both instances and each instance will
> > have a seaparate snps,maximum_speed attribute :-)
> >
> > I'm now considering if we should make maximum_speed a generic attribute,
> > Kishon ? Alex ? Alan ?
> >
> > anyone else needs such thing ?
> 
> We have a force-full-speed attibute for chipidea on the way. This
> maximum_speed looks like a more generic alternative. Michael, what say
> you?

The maximum_speed attribute sounds more reasonable. I will change my
patch to it.

Regards,
Michael

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

Re: [PATCH] usb: dwc3: core: continue probe even if usb3 phy is not available

[Felipe Balbi]

[-- Attachment #1: Type: text/plain, Size: 716 bytes --]

Hi,

On Thu, Jun 27, 2013 at 08:14:16AM +0200, Michael Grzeschik wrote:
> > > right, but in DT you will define both instances and each instance will
> > > have a seaparate snps,maximum_speed attribute :-)
> > >
> > > I'm now considering if we should make maximum_speed a generic attribute,
> > > Kishon ? Alex ? Alan ?
> > >
> > > anyone else needs such thing ?
> > 
> > We have a force-full-speed attibute for chipidea on the way. This
> > maximum_speed looks like a more generic alternative. Michael, what say
> > you?
> 
> The maximum_speed attribute sounds more reasonable. I will change my
> patch to it.

thanks, perhaps we can add a generic helper in udc-core or usb-common ?

-- 
balbi

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[-- Type: application/pgp-signature, Size: 836 bytes --]

Re: [PATCH] usb: dwc3: core: continue probe even if usb3 phy is not available

[Felipe Balbi]

[-- Attachment #1: Type: text/plain, Size: 716 bytes --]

Hi,

On Thu, Jun 27, 2013 at 08:14:16AM +0200, Michael Grzeschik wrote:
> > > right, but in DT you will define both instances and each instance will
> > > have a seaparate snps,maximum_speed attribute :-)
> > >
> > > I'm now considering if we should make maximum_speed a generic attribute,
> > > Kishon ? Alex ? Alan ?
> > >
> > > anyone else needs such thing ?
> > 
> > We have a force-full-speed attibute for chipidea on the way. This
> > maximum_speed looks like a more generic alternative. Michael, what say
> > you?
> 
> The maximum_speed attribute sounds more reasonable. I will change my
> patch to it.

thanks, perhaps we can add a generic helper in udc-core or usb-common ?

-- 
balbi

[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 836 bytes --]

Re: [PATCH] usb: dwc3: core: continue probe even if usb3 phy is not available

[Michael Grzeschik]

Hi,

On Thu, Jun 27, 2013 at 09:35:26AM +0300, Felipe Balbi wrote:
> Hi,
> 
> On Thu, Jun 27, 2013 at 08:14:16AM +0200, Michael Grzeschik wrote:
> > > > right, but in DT you will define both instances and each instance will
> > > > have a seaparate snps,maximum_speed attribute :-)
> > > >
> > > > I'm now considering if we should make maximum_speed a generic attribute,
> > > > Kishon ? Alex ? Alan ?
> > > >
> > > > anyone else needs such thing ?
> > > 
> > > We have a force-full-speed attibute for chipidea on the way. This
> > > maximum_speed looks like a more generic alternative. Michael, what say
> > > you?
> > 
> > The maximum_speed attribute sounds more reasonable. I will change my
> > patch to it.
> 
> thanks, perhaps we can add a generic helper in udc-core or usb-common ?

As this function is not only udc specific, this should go into usb-common.
But right, we should go with a helper here. I will write one in addition
to my full-speed patch as first user of it.

Thanks,
Michael

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

Re: [PATCH] usb: dwc3: core: continue probe even if usb3 phy is not available

[Felipe Balbi]

[-- Attachment #1: Type: text/plain, Size: 1008 bytes --]

Hi,

On Thu, Jun 27, 2013 at 09:24:08AM +0200, Michael Grzeschik wrote:
> > > > > right, but in DT you will define both instances and each instance will
> > > > > have a seaparate snps,maximum_speed attribute :-)
> > > > >
> > > > > I'm now considering if we should make maximum_speed a generic attribute,
> > > > > Kishon ? Alex ? Alan ?
> > > > >
> > > > > anyone else needs such thing ?
> > > > 
> > > > We have a force-full-speed attibute for chipidea on the way. This
> > > > maximum_speed looks like a more generic alternative. Michael, what say
> > > > you?
> > > 
> > > The maximum_speed attribute sounds more reasonable. I will change my
> > > patch to it.
> > 
> > thanks, perhaps we can add a generic helper in udc-core or usb-common ?
> 
> As this function is not only udc specific, this should go into usb-common.
> But right, we should go with a helper here. I will write one in addition
> to my full-speed patch as first user of it.

alright, thanks :-)

-- 
balbi

[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 836 bytes --]

Re: [PATCH] usb: dwc3: core: continue probe even if usb3 phy is not available

[Felipe Balbi]

[-- Attachment #1: Type: text/plain, Size: 1008 bytes --]

Hi,

On Thu, Jun 27, 2013 at 09:24:08AM +0200, Michael Grzeschik wrote:
> > > > > right, but in DT you will define both instances and each instance will
> > > > > have a seaparate snps,maximum_speed attribute :-)
> > > > >
> > > > > I'm now considering if we should make maximum_speed a generic attribute,
> > > > > Kishon ? Alex ? Alan ?
> > > > >
> > > > > anyone else needs such thing ?
> > > > 
> > > > We have a force-full-speed attibute for chipidea on the way. This
> > > > maximum_speed looks like a more generic alternative. Michael, what say
> > > > you?
> > > 
> > > The maximum_speed attribute sounds more reasonable. I will change my
> > > patch to it.
> > 
> > thanks, perhaps we can add a generic helper in udc-core or usb-common ?
> 
> As this function is not only udc specific, this should go into usb-common.
> But right, we should go with a helper here. I will write one in addition
> to my full-speed patch as first user of it.

alright, thanks :-)

-- 
balbi

[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 836 bytes --]

Re: [PATCH] usb: dwc3: core: continue probe even if usb3 phy is not available

[Felipe Balbi]

[-- Attachment #1: Type: text/plain, Size: 1268 bytes --]

Hi,

On Thu, Jun 27, 2013 at 10:30:33AM +0300, Felipe Balbi wrote:
> Hi,
> 
> On Thu, Jun 27, 2013 at 09:24:08AM +0200, Michael Grzeschik wrote:
> > > > > > right, but in DT you will define both instances and each instance will
> > > > > > have a seaparate snps,maximum_speed attribute :-)
> > > > > >
> > > > > > I'm now considering if we should make maximum_speed a generic attribute,
> > > > > > Kishon ? Alex ? Alan ?
> > > > > >
> > > > > > anyone else needs such thing ?
> > > > > 
> > > > > We have a force-full-speed attibute for chipidea on the way. This
> > > > > maximum_speed looks like a more generic alternative. Michael, what say
> > > > > you?
> > > > 
> > > > The maximum_speed attribute sounds more reasonable. I will change my
> > > > patch to it.
> > > 
> > > thanks, perhaps we can add a generic helper in udc-core or usb-common ?
> > 
> > As this function is not only udc specific, this should go into usb-common.
> > But right, we should go with a helper here. I will write one in addition
> > to my full-speed patch as first user of it.
> 
> alright, thanks :-)

Michael, if you need any help with patching in maximum_speed attribute,
let me know as I have some time to work on that part.

cheers

-- 
balbi

[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 836 bytes --]

Re: [PATCH] usb: dwc3: core: continue probe even if usb3 phy is not available

[Felipe Balbi]

[-- Attachment #1: Type: text/plain, Size: 1268 bytes --]

Hi,

On Thu, Jun 27, 2013 at 10:30:33AM +0300, Felipe Balbi wrote:
> Hi,
> 
> On Thu, Jun 27, 2013 at 09:24:08AM +0200, Michael Grzeschik wrote:
> > > > > > right, but in DT you will define both instances and each instance will
> > > > > > have a seaparate snps,maximum_speed attribute :-)
> > > > > >
> > > > > > I'm now considering if we should make maximum_speed a generic attribute,
> > > > > > Kishon ? Alex ? Alan ?
> > > > > >
> > > > > > anyone else needs such thing ?
> > > > > 
> > > > > We have a force-full-speed attibute for chipidea on the way. This
> > > > > maximum_speed looks like a more generic alternative. Michael, what say
> > > > > you?
> > > > 
> > > > The maximum_speed attribute sounds more reasonable. I will change my
> > > > patch to it.
> > > 
> > > thanks, perhaps we can add a generic helper in udc-core or usb-common ?
> > 
> > As this function is not only udc specific, this should go into usb-common.
> > But right, we should go with a helper here. I will write one in addition
> > to my full-speed patch as first user of it.
> 
> alright, thanks :-)

Michael, if you need any help with patching in maximum_speed attribute,
let me know as I have some time to work on that part.

cheers

-- 
balbi

[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 836 bytes --]

Re: [PATCH] usb: dwc3: core: continue probe even if usb3 phy is not available

[Michael Grzeschik]

On Fri, Jun 28, 2013 at 09:00:00PM +0300, Felipe Balbi wrote:
> Hi,
> 
> On Thu, Jun 27, 2013 at 10:30:33AM +0300, Felipe Balbi wrote:
> > Hi,
> > 
> > On Thu, Jun 27, 2013 at 09:24:08AM +0200, Michael Grzeschik wrote:
> > > > > > > right, but in DT you will define both instances and each instance will
> > > > > > > have a seaparate snps,maximum_speed attribute :-)
> > > > > > >
> > > > > > > I'm now considering if we should make maximum_speed a generic attribute,
> > > > > > > Kishon ? Alex ? Alan ?
> > > > > > >
> > > > > > > anyone else needs such thing ?
> > > > > > 
> > > > > > We have a force-full-speed attibute for chipidea on the way. This
> > > > > > maximum_speed looks like a more generic alternative. Michael, what say
> > > > > > you?
> > > > > 
> > > > > The maximum_speed attribute sounds more reasonable. I will change my
> > > > > patch to it.
> > > > 
> > > > thanks, perhaps we can add a generic helper in udc-core or usb-common ?
> > > 
> > > As this function is not only udc specific, this should go into usb-common.
> > > But right, we should go with a helper here. I will write one in addition
> > > to my full-speed patch as first user of it.
> > 
> > alright, thanks :-)
> 
> Michael, if you need any help with patching in maximum_speed attribute,
> let me know as I have some time to work on that part.

Feel free to begin with anything. I am currently short on time.
Do you need some pointers?

Thanks,
Michael

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

Re: [PATCH] usb: dwc3: core: continue probe even if usb3 phy is not available

[Michael Grzeschik]

On Fri, Jun 28, 2013 at 09:00:00PM +0300, Felipe Balbi wrote:
> Hi,
> 
> On Thu, Jun 27, 2013 at 10:30:33AM +0300, Felipe Balbi wrote:
> > Hi,
> > 
> > On Thu, Jun 27, 2013 at 09:24:08AM +0200, Michael Grzeschik wrote:
> > > > > > > right, but in DT you will define both instances and each instance will
> > > > > > > have a seaparate snps,maximum_speed attribute :-)
> > > > > > >
> > > > > > > I'm now considering if we should make maximum_speed a generic attribute,
> > > > > > > Kishon ? Alex ? Alan ?
> > > > > > >
> > > > > > > anyone else needs such thing ?
> > > > > > 
> > > > > > We have a force-full-speed attibute for chipidea on the way. This
> > > > > > maximum_speed looks like a more generic alternative. Michael, what say
> > > > > > you?
> > > > > 
> > > > > The maximum_speed attribute sounds more reasonable. I will change my
> > > > > patch to it.
> > > > 
> > > > thanks, perhaps we can add a generic helper in udc-core or usb-common ?
> > > 
> > > As this function is not only udc specific, this should go into usb-common.
> > > But right, we should go with a helper here. I will write one in addition
> > > to my full-speed patch as first user of it.
> > 
> > alright, thanks :-)
> 
> Michael, if you need any help with patching in maximum_speed attribute,
> let me know as I have some time to work on that part.

Feel free to begin with anything. I am currently short on time.
Do you need some pointers?

Thanks,
Michael

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |
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Re: [PATCH] usb: dwc3: core: continue probe even if usb3 phy is not available

[Felipe Balbi]

[-- Attachment #1: Type: text/plain, Size: 1422 bytes --]

Hi,

On Fri, Jun 28, 2013 at 10:06:01PM +0200, Michael Grzeschik wrote:
> > > > > > > > right, but in DT you will define both instances and each instance will
> > > > > > > > have a seaparate snps,maximum_speed attribute :-)
> > > > > > > >
> > > > > > > > I'm now considering if we should make maximum_speed a generic attribute,
> > > > > > > > Kishon ? Alex ? Alan ?
> > > > > > > >
> > > > > > > > anyone else needs such thing ?
> > > > > > > 
> > > > > > > We have a force-full-speed attibute for chipidea on the way. This
> > > > > > > maximum_speed looks like a more generic alternative. Michael, what say
> > > > > > > you?
> > > > > > 
> > > > > > The maximum_speed attribute sounds more reasonable. I will change my
> > > > > > patch to it.
> > > > > 
> > > > > thanks, perhaps we can add a generic helper in udc-core or usb-common ?
> > > > 
> > > > As this function is not only udc specific, this should go into usb-common.
> > > > But right, we should go with a helper here. I will write one in addition
> > > > to my full-speed patch as first user of it.
> > > 
> > > alright, thanks :-)
> > 
> > Michael, if you need any help with patching in maximum_speed attribute,
> > let me know as I have some time to work on that part.
> 
> Feel free to begin with anything. I am currently short on time.
> Do you need some pointers?

not, really v1 will come on monday.

-- 
balbi

[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 836 bytes --]

Re: [PATCH] usb: dwc3: core: continue probe even if usb3 phy is not available

[Felipe Balbi]

[-- Attachment #1: Type: text/plain, Size: 1422 bytes --]

Hi,

On Fri, Jun 28, 2013 at 10:06:01PM +0200, Michael Grzeschik wrote:
> > > > > > > > right, but in DT you will define both instances and each instance will
> > > > > > > > have a seaparate snps,maximum_speed attribute :-)
> > > > > > > >
> > > > > > > > I'm now considering if we should make maximum_speed a generic attribute,
> > > > > > > > Kishon ? Alex ? Alan ?
> > > > > > > >
> > > > > > > > anyone else needs such thing ?
> > > > > > > 
> > > > > > > We have a force-full-speed attibute for chipidea on the way. This
> > > > > > > maximum_speed looks like a more generic alternative. Michael, what say
> > > > > > > you?
> > > > > > 
> > > > > > The maximum_speed attribute sounds more reasonable. I will change my
> > > > > > patch to it.
> > > > > 
> > > > > thanks, perhaps we can add a generic helper in udc-core or usb-common ?
> > > > 
> > > > As this function is not only udc specific, this should go into usb-common.
> > > > But right, we should go with a helper here. I will write one in addition
> > > > to my full-speed patch as first user of it.
> > > 
> > > alright, thanks :-)
> > 
> > Michael, if you need any help with patching in maximum_speed attribute,
> > let me know as I have some time to work on that part.
> 
> Feel free to begin with anything. I am currently short on time.
> Do you need some pointers?

not, really v1 will come on monday.

-- 
balbi

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