linux-kernel - Re: [PATCH v3 04/11] otg-fsm: move usb_bus_start

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Date:	Thu, 16 Jul 2015 13:40:05 +0300
From:	Roger Quadros <rogerq@...com>
To:	Peter Chen <peter.chen@...escale.com>
CC:	<stern@...land.harvard.edu>, <balbi@...com>,
	<gregkh@...uxfoundation.org>, <dan.j.williams@...el.com>,
	<jun.li@...escale.com>, <mathias.nyman@...ux.intel.com>,
	<tony@...mide.com>, <Joao.Pinto@...opsys.com>,
	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-omap@...r.kernel.org>
Subject: Re: [PATCH v3 04/11] otg-fsm: move usb_bus_start_enum into otg-fsm->ops

On 16/07/15 03:54, Peter Chen wrote:
> On Wed, Jul 15, 2015 at 04:30:27PM +0300, Roger Quadros wrote:
>> On 14/07/15 03:34, Peter Chen wrote:
>>> On Mon, Jul 13, 2015 at 01:13:54PM +0300, Roger Quadros wrote:
>>>> Peter,
>>>>
>>>> On 13/07/15 04:58, Peter Chen wrote:
>>>>> On Wed, Jul 08, 2015 at 01:19:30PM +0300, Roger Quadros wrote:
>>>>>> This is to prevent missing symbol build error if OTG is
>>>>>> enabled (built-in) and HCD core (CONFIG_USB) is module.
>>>>>>
>>>>>
>>>>> We may let the OTG-DRD/OTG-FSM depends on CONFIG_USB to fix it.
>>>>
>>>> CONFIG_OTG already depends on CONFIG_USB as it is a sub-option of
>>>> CONFIG_USB. It doesn't depend on CONFIG_USB_GADGET and that can
>>>> be fixed.
>>>>
>>>> But dependency is not the problem here. Symbols not available to
>>>> OTG driver when USB/GADGET is 'm' is the problem.
>>>>
>>>> e.g.
>>>> CONFIG_USB_OTG is always built-in.
>>>> we need to work if CONFIG_USB is 'm'/'y'
>>>> _and_ if CONFIG_USB_GADGET is 'm'/'y'
>>>>
>>>
>>> below should fix this issue, but we may need to make some
>>> changes for code which are defined by CONFIG_USB_OTG.
>>>
>>> diff --git a/drivers/usb/core/Kconfig b/drivers/usb/core/Kconfig
>>> index a99c89e..5e374ad 100644
>>> --- a/drivers/usb/core/Kconfig
>>> +++ b/drivers/usb/core/Kconfig
>>> @@ -42,8 +42,9 @@ config USB_DYNAMIC_MINORS
>>>           If you are unsure about this, say N here.
>>>
>>> config USB_OTG
>>> -       bool "OTG support"
>>> +       tristate "OTG support"
>>> 	depends on PM
>>> +       depends on USB && USB_GADGET
>>> 	default n
>>>    help
>>>      The most notable feature of
>>>      USB OTG is support for a
>>
>> With this USB_OTG will become 'm' when either USB or USB_GADGET is m
>> and will break if either USB or USB_GADGET is made y as all OTG core
>> API symbols won't be available. :)
>>
> 
> Ok, after thinking more, seems we can't handle properly if USB_OTG as
> 'm', your idea that using host/gadget/fsm->ops to call hcd/gadget API
> and the controller driver will defines these ops (due to it will use
> hcd/gadget function) is proper way currently.
> 

Can I take this as your Ack for this patch? :)

cheers,
-roger
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