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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next prev parent 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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