linux-kernel - Re: [PATCH 2/5] usb: xhci: plat: Create both HCDs before adding them

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Date:	Tue, 21 Apr 2015 10:11:57 +0300
From:	Roger Quadros <rogerq@...com>
To:	Mathias Nyman <mathias.nyman@...ux.intel.com>,
	<mathias.nyman@...el.com>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>
CC:	<gregkh@...uxfoundation.org>, <linux-usb@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, "Balbi, Felipe" <balbi@...com>,
	"ABRAHAM, KISHON VIJAY" <kishon@...com>
Subject: Re: [PATCH 2/5] usb: xhci: plat: Create both HCDs before adding them

fixed Kishon's id.

On 21/04/15 12:49, 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.
> 
> In fact usb_add_hcd() is already handling the phy for us.
> So I'm in favor of getting rid of commit 7b8ef22ea547b80475ac7feab06fb15e0fc143d8
> (usb: xhci: plat: Add USB phy support)
> 
> cheers,
> -roger
> 

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