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From: Felipe Balbi <balbi@kernel.org>
To: Roger Quadros <rogerq@ti.com>, peter.chen@freescale.com
Cc: tony@atomide.com, gregkh@linuxfoundation.org,
	dan.j.williams@intel.com, mathias.nyman@linux.intel.com,
	Joao.Pinto@synopsys.com, sergei.shtylyov@cogentembedded.com,
	jun.li@freescale.com, grygorii.strashko@ti.com,
	yoshihiro.shimoda.uh@renesas.com, robh@kernel.org,
	nsekhar@ti.com, b-liu@ti.com, joe@perches.com,
	linux-usb@vger.kernel.org, linux-omap@vger.kernel.org,
	linux-kernel@vger.kernel.org, devicetree@vger.kernel.org
Subject: Re: [PATCH v10 06/14] usb: gadget.h: Add OTG to gadget interface
Date: Mon, 20 Jun 2016 12:24:53 +0300	[thread overview]
Message-ID: <87inx4qkka.fsf@linux.intel.com> (raw)
In-Reply-To: <5767A87C.20704@ti.com>

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Hi,

Roger Quadros <rogerq@ti.com> writes:
>>>> Roger Quadros <rogerq@ti.com> writes:
>>>>> The OTG core will use struct otg_gadget_ops to
>>>>> start/stop the gadget controller.
>>>>>
>>>>> The main purpose of this interface is to avoid directly
>>>>> calling usb_gadget_start/stop() from the OTG core as they
>>>>> wouldn't be defined in the built-in symbol table if
>>>>> CONFIG_USB_GADGET is m.
>>>>>
>>>>> Signed-off-by: Roger Quadros <rogerq@ti.com>
>>>>> ---
>>>>>  include/linux/usb/gadget.h | 16 ++++++++++++++++
>>>>>  1 file changed, 16 insertions(+)
>>>>>
>>>>> diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
>>>>> index 2dd9e6b..f4fc0aa 100644
>>>>> --- a/include/linux/usb/gadget.h
>>>>> +++ b/include/linux/usb/gadget.h
>>>>> @@ -639,6 +639,22 @@ struct usb_gadget_driver {
>>>>>  };
>>>>>  
>>>>>  
>>>>> +/*-------------------------------------------------------------------------*/
>>>>> +
>>>>> +/**
>>>>> + * struct otg_gadget_ops - Interface between OTG core and gadget
>>>>> + *
>>>>> + * Provided by the gadget core to allow the OTG core to start/stop the gadget
>>>>> + *
>>>>> + * @start: function to start the gadget
>>>>> + * @stop: function to stop the gadget
>>>>> + * @connect_control: function to connect/disconnect from the bus
>>>>> + */
>>>>> +struct otg_gadget_ops {
>>>>> +	int (*start)(struct usb_gadget *gadget);
>>>>> +	int (*stop)(struct usb_gadget *gadget);
>>>>> +	int (*connect_control)(struct usb_gadget *gadget, bool connect);
>>>>> +};
>>>>
>>>> you shouldn't need these at all. They are already part of the gadget
>>>> framework as ->udc_start(), ->udc_stop() and ->pullup()
>>>>
>>>
>>> This is to avoid the undefined symbol errors during build when OTG has is
>>> built-in because USB (host) is built-in but GADGET is still a module.
>> 
>> change your Kconfig dependencies. OTG layer shouldn't be built-in unless
>> both Gadget and Host are built-in.
>> 
>
> That is only one side of the story.
> What happens if OTG is (m), Host is (m) but Gadget is (built in).
>
> Gadget build will fail because of undefined symbol errors for all of
> the OTG APIs.

So you created a circular dependency, right? That's not good either. I
suggest you clean that up because this is bound to create randconfig
build problems in the long run.

-- 
balbi

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  reply	other threads:[~2016-06-20  9:25 UTC|newest]

Thread overview: 89+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-10 13:07 [PATCH v10 00/14] USB OTG/dual-role framework Roger Quadros
2016-06-10 13:07 ` [PATCH v10 01/14] usb: hcd: Initialize hcd->flags to 0 Roger Quadros
2016-06-14  8:16   ` Roger Quadros
2016-06-10 13:07 ` [PATCH v10 02/14] usb: otg-fsm: Prevent build warning "VDBG" redefined Roger Quadros
2016-06-10 13:07 ` [PATCH v10 03/14] usb: hcd.h: Add OTG to HCD interface Roger Quadros
2016-06-14  8:17   ` Roger Quadros
2016-06-14 14:21     ` Alan Stern
2016-06-15  7:14       ` Roger Quadros
2016-06-10 13:07 ` [PATCH v10 04/14] usb: otg-fsm: use usb_otg wherever possible Roger Quadros
2016-06-10 13:07 ` [PATCH v10 05/14] usb: otg-fsm: move host controller operations into usb_otg->hcd_ops Roger Quadros
2016-06-10 13:07 ` [PATCH v10 06/14] usb: gadget.h: Add OTG to gadget interface Roger Quadros
2016-06-12  9:13   ` Peter Chen
2016-06-20  7:21   ` Felipe Balbi
2016-06-20  7:28     ` Roger Quadros
2016-06-20  8:13       ` Felipe Balbi
2016-06-20  8:25         ` Roger Quadros
2016-06-20  9:24           ` Felipe Balbi [this message]
2016-06-20  9:43             ` Roger Quadros
2016-06-10 13:07 ` [PATCH v10 07/14] usb: otg: get rid of CONFIG_USB_OTG_FSM in favour of CONFIG_USB_OTG Roger Quadros
2016-06-10 13:07 ` [PATCH v10 08/14] usb: otg: add OTG/dual-role core Roger Quadros
2016-06-12 11:21   ` Peter Chen
2016-06-13  7:42     ` Roger Quadros
2016-06-13  7:56   ` [PATCH v11 " Roger Quadros
2016-06-13  7:58     ` Peter Chen
2016-06-20  7:45     ` Felipe Balbi
2016-06-20 10:13       ` Roger Quadros
2016-06-20 12:03         ` Felipe Balbi
2016-06-20 12:26           ` Roger Quadros
2016-06-20 12:46             ` Felipe Balbi
2016-06-21  6:39           ` Peter Chen
2016-06-21  7:19             ` Felipe Balbi
2016-06-21  8:02               ` Peter Chen
2016-06-21  8:18                 ` Felipe Balbi
2016-06-21  9:14                   ` Peter Chen
2016-06-21 12:35                     ` Felipe Balbi
2016-06-21 13:12                       ` Peter Chen
2016-06-21 14:47                         ` Felipe Balbi
2016-06-22  3:33                           ` Peter Chen
2016-06-22  6:51                             ` Felipe Balbi
2016-06-22  7:30                               ` Peter Chen
2016-06-22  8:00                                 ` Felipe Balbi
2016-06-23  7:41                             ` Yoshihiro Shimoda
2016-06-21  2:30         ` Yoshihiro Shimoda
2016-06-21  7:21           ` Felipe Balbi
2016-06-20 11:49       ` Peter Chen
2016-06-20 12:08         ` Felipe Balbi
2016-06-21  6:05           ` Peter Chen
2016-06-21  7:26             ` Felipe Balbi
2016-06-21  9:07               ` Peter Chen
2016-06-21 10:02                 ` Felipe Balbi
2016-06-21 10:43                   ` Tony Lindgren
2016-06-21 10:56                     ` Felipe Balbi
2016-06-21 13:05                   ` Peter Chen
2016-06-22  6:56                     ` Felipe Balbi
2016-06-22  7:33                       ` Peter Chen
2016-06-22  8:03                         ` Felipe Balbi
2016-06-22  7:49                       ` Roger Quadros
2016-06-22  8:14                         ` Felipe Balbi
2016-06-22  8:30                           ` Roger Quadros
2017-01-19 11:56                             ` Vivek Gautam
2017-01-19 12:15                               ` Roger Quadros
2017-01-19 15:15                                 ` vivek.gautam
2017-01-20  8:30                                   ` Roger Quadros
2017-01-20 11:39                                     ` Vivek Gautam
2016-06-23  7:42                         ` Yoshihiro Shimoda
2016-06-10 13:07 ` [PATCH v10 09/14] usb: of: add an API to get OTG device from USB controller node Roger Quadros
2016-06-13  8:13   ` Jun Li
2016-06-13  8:16     ` Roger Quadros
2016-06-13  8:23   ` [PATCH v11 " Roger Quadros
2016-06-10 13:07 ` [PATCH v10 10/14] usb: otg: add hcd companion support Roger Quadros
2016-06-10 13:07 ` [PATCH v10 11/14] usb: otg: use dev_vdbg() instead of VDBG() Roger Quadros
2016-06-10 13:07 ` [PATCH v10 12/14] usb: hcd: Adapt to OTG core Roger Quadros
2016-06-14  8:17   ` Roger Quadros
2016-06-10 13:07 ` [PATCH v10 13/14] usb: gadget: udc: adapt " Roger Quadros
2016-06-12 11:36   ` Peter Chen
2016-06-13  7:14     ` Roger Quadros
2016-06-13  7:20       ` Peter Chen
2016-06-13  7:37         ` Roger Quadros
2016-06-13  7:40           ` Peter Chen
2016-06-13  7:55   ` [PATCH v11 " Roger Quadros
2016-06-13  7:56     ` Peter Chen
2016-06-13  8:06       ` Roger Quadros
2016-06-10 13:07 ` [PATCH v10 14/14] usb: host: xhci-plat: Add otg device to platform data Roger Quadros
2016-06-14  8:18   ` Roger Quadros
2016-06-14  2:17 ` [PATCH v10 00/14] USB OTG/dual-role framework Peter Chen
2016-06-14  8:12   ` Roger Quadros
2016-06-16 11:07 ` Roger Quadros
2016-06-17  7:17   ` Felipe Balbi
2016-06-17  7:31     ` Roger Quadros

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