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SubjectRe: [PATCH 2/5] usb: xhci: plat: Create both HCDs before adding them
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On 21/04/15 11:08, Maxime Ripard wrote:
> On Tue, Apr 21, 2015 at 12:49:54PM +0300, Roger Quadros wrote:
>> On 20/04/15 15:35, Mathias Nyman wrote:
>>> Hi
>>>
>>> On 02.04.2015 15:23, Roger Quadros wrote:
>>>> As xhci_hcd is now allocated by usb_create_hcd(), we don't
>>>> need to add the primary HCD before creating the shared HCD.
>>>>
>>>> Creating the shared HCD before adding the primary HCD is particularly
>>>> useful for the OTG use case so that we know at the OTG core if
>>>> the HCD is in single configuration or dual (primary + shared)
>>>> configuration.
>>>>
>>>
>>> This doesn't apply as
>>>
>>> commit 7b8ef22ea547b80475ac7feab06fb15e0fc143d8
>>> usb: xhci: plat: Add USB phy support
>>>
>>> changed xhci-plat.c since.
>>>
>>> I rebased it, and the changed version is sitting in the for-usb-next branch in:
>>> git://git.kernel.org/pub/scm/linux/kernel/git/mnyman/xhci.git
>>>
>>> But it appeared to me that usb_add_hcd() and usb_remove_hcd() will also
>>> call phy init and remove functions. As the order how hcds are created and added
>>> would change I'd need some more eyes on this to see if it will cause regression.
>>>
>>> Or maybe in the best case we could get rid of the "Add USB phy support" patch as
>>> we will call xhci_add_hcd() for the first hcd much later, and it could maybe init
>>> the phy for us?
>>
>> I thought usb_phy_*() stuff would be deprecated and we should use
>> phy framework instead i.e. phy_init() and friends.
>
> Except that all drivers have not been converted yet... So it's not
> really an option until then.
>
>> In fact usb_add_hcd() is already handling the phy for us.
>
> If it handles USB phy, then I don't really have an issue with it.

It handles usb_phy as well. It just expects hcd->usb_phy to be set.

cheers,
- -roger
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