linux-kernel - Re: [PATCH v4 2/2] usb: gadget: Add xilinx usb2 device support

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Date:	Wed, 10 Sep 2014 19:25:11 +0530
From:	sundeep subbaraya <sundeep.lkml@...il.com>
To:	"balbi@...com" <balbi@...com>
Cc:	Daniel Mack <daniel@...que.org>,
	Subbaraya Sundeep Bhatta <subbaraya.sundeep.bhatta@...inx.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Michal Simek <michals@...inx.com>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	svemula@...inx.com, anirudh@...inx.com,
	Subbaraya Sundeep Bhatta <sbhatta@...inx.com>
Subject: Re: [PATCH v4 2/2] usb: gadget: Add xilinx usb2 device support

Hi Felipe,

On Thu, Aug 21, 2014 at 7:30 PM, Felipe Balbi <balbi@...com> wrote:
> On Thu, Aug 21, 2014 at 12:19:03PM +0530, sundeep subbaraya wrote:
>> Hi Daniel,
>>
>> On Tue, Aug 19, 2014 at 3:26 PM, Daniel Mack <daniel@...que.org> wrote:
>> > Hi,
>> >
>> > On 07/22/2014 11:08 AM, Subbaraya Sundeep Bhatta wrote:
>> >> This patch adds xilinx usb2 device driver support
>> >
>> > Add some more information here, please. Copying the text from the
>> > Kconfig option is already a good start.
>> >
>> >>  drivers/usb/gadget/Kconfig      |   14 +
>> >>  drivers/usb/gadget/Makefile     |    1 +
>> >>  drivers/usb/gadget/udc-xilinx.c | 2261 +++++++++++++++++++++++++++++++++++++++
>> >>  3 files changed, 2276 insertions(+), 0 deletions(-)
>> >>  create mode 100644 drivers/usb/gadget/udc-xilinx.c
>> >
>> > As your driver has a DT binding, you have to describe it in
>> > Documentation/devicetree/bindings.
>> >
>> >> --- a/drivers/usb/gadget/Kconfig
>> >> +++ b/drivers/usb/gadget/Kconfig
>> >> @@ -459,6 +459,20 @@ config USB_EG20T
>> >>         ML7213/ML7831 is companion chip for Intel Atom E6xx series.
>> >>         ML7213/ML7831 is completely compatible for Intel EG20T PCH.
>> >>
>> >> +config USB_GADGET_XILINX
>> >> +     tristate "Xilinx USB Driver"
>> >> +     depends on COMPILE_TEST
>> >
>> > Why would you depend on that?
>>
>> Felipe asked to make this since this is USB soft IP driver and its
>> dependencies have tendency to grow.
>
> that's not exactly what I asked :-) Usually you only add COMPILE_TEST
> when you have an ARCH dependency. So something like:
>
>         depends on ARCH_ARM || COMPILE_TEST
>
> would make it clear that this driver is only available on ARM, but when
> doing my build tests, I'd still be able to compile it on x86.

Ok got it :)
>
>> > Also, your code uses device tree functions unconditionally, which is
>> > fine, but it must hence depend on 'OF'.
>>
>> Ok will add OF along with COMPILE_TEST
>
> so this would be:
>
>         depends on OF || COMPILE_TEST
Ok

Thanks,
Sundeep

>
> --
> balbi
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