Re: [PATCH v2 2/7] ARM: tegra: update device trees for USB binding rework

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 04/04/2013 07:01 AM, Venu Byravarasu wrote:
>> -----Original Message-----
>> From: Stephen Warren [mailto:swarren@xxxxxxxxxxxxx]
>> Sent: Thursday, April 04, 2013 12:47 AM
>> To: Venu Byravarasu
>> Cc: gregkh@xxxxxxxxxxxxxxxxxxx; balbi@xxxxxx;
>> stern@xxxxxxxxxxxxxxxxxxx; linux-tegra@xxxxxxxxxxxxxxx; linux-
>> usb@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx
>> Subject: Re: [PATCH v2 2/7] ARM: tegra: update device trees for USB binding
>> rework
>>
>> On 04/03/2013 02:41 AM, Venu Byravarasu wrote:
>>> This patch updates all Tegra board files so that they contain all the
>>
>> The binding documentation says that the vbus-supply property is required
>> in all cases. However, many of the DT files still don't have that
>> property even after this patch. That's inconsistent.
> 
> Will edit the binding to have the vbus-supply only for otg cases. 

>>> diff --git a/arch/arm/boot/dts/tegra20-seaboard.dts b/arch/arm/boot/dts/tegra20-seaboard.dts
>>
>>> +	usb-phy@c5000000 {
>>> +		vbus-supply = <&vbus_reg>;
>>> +		dr_mode = "otg";
>>> +	};
>>
>> Where is the nvidia,vbus-gpio property? Since your code changes don't
>> actually implement use of the vbus-supply property yet, they will expect
>> the vbus-gpio property to exist in the PHY node.
> 
> As of now Vbus-gpio is being used by EHCI driver only.
> As anyways we wanted to use vbus-supply, will implement its
> support in PHY driver and remove vbus-gpio from EHCI node. 
> Hence did not add vbus-gpio to PHY DT nodes.

Ah right. I thought that this patch series moved the use of vbus-gpio
from the EHCI to the PHY driver, just like it moved the handling of
other properties such as dr_mode. I guess that's not actually true.

Just so we're clear, I'd expect the following then:

* Update binding to remove references to vbus-gpio from EHCI binding,
add references to vbus-supply to PHY binding.

* Update DT to add vbus-supply to PHY nodes, but don't remove vbus-gpio
from EHCI nodes.

* The code in this series doesn't actually change the vbus-* usage yet.

...

* Once this series is finalized, create another follow-on patch that
adds vbus-supply handling in to the PHY driver, and removes vbus-gpio
handling from the EHCI driver.

* Finally, remove vbus-gpio from the DT files.

I think we're in agreement on this now, and this series mostly already
does exactly that. I just wanted to spell it out explicitly to make sure.
--
To unsubscribe from this list: send the line "unsubscribe linux-tegra" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [ARM Kernel]     [Linux ARM]     [Linux ARM MSM]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux