[U-Boot] [UBOOT RFC PATCH 02/13] usb: gadget: udc-core: Add minimal udc-core from linux kernel

[Kishon Vijay Abraham I <kishon@ti.com>]

On Tuesday 19 August 2014 08:58 PM, Felipe Balbi wrote:
> On Tue, Aug 19, 2014 at 08:48:36PM +0530, Kishon Vijay Abraham I wrote:
>> Hi Lukasz,
>>
>> On Tuesday 19 August 2014 02:22 PM, Lukasz Majewski wrote:
>>> Hi Kishon,
>>>
>>>> In order to support multiple USB device controllers in uboot,
>>>> udc-core is needed.
>>>
>>> Is it? In u-boot at best only one UDC is operational at a time.
>>
>> I didn't mean operational at the same time. dra7xx has 4 USB
>> controllers and we should allow the user to use any USB port for DFU.
> 
> but from u-boot's perspective, that can (should?) be a build-time
> choice. That user, certainly, won't need more than one port active for
> booting, right ?

hmm.. right now I don't think any one needs more than one port.
But then without udc core, we have to maintain global variable in gadget.c.
Maybe slightly cleaner way is to use udc..
> 
>>>> udc-core also helps to cleanly link the USB
>>>> peripheral driver with the gadget driver. Hence Ported minimal
>>>> udc-core from linux kernel.
>>>
>>> I'd appreciate the exact SHA for this udc-core.c code. And the SHA
>>> should be from some already released mainline code (like final 3.16),
>>> not any private branch nor linux-next.
>>
>> We can't have the exact udc-core.c from linux kernel as it deals with
>> kernel driver model stuff and vfs which is not needed for kernel.
>> Trying to have the exact same code from kernel complicates it.
> 
> what he means is to point to the SHA1 when you originally forked the
> code from kernel. Sure udc-core can't be the same, but you based off of
> a known commit ID frmo the kernel.

Ah ok. The header of the file gives the gives the kernel tag it is forked from.
Maybe add that in commit log to?

-Kishon

>