[PATCH v5 1/3] ARM: add CPPI 4.1 DMA support

[Gupta, Ajay Kumar]

Hi,
> >>>> Add support for Texas Instuments Communication Port Programming
> Interface 4.1
> >>>> (CPPI 4.1) used on OMAP-L1x/DA8xx and AM35x.
> 
> >>>> At this moment, only the DMA controller and queue manager are
> supported.
> >>>> Support for the buffer manager is lacking but these chips don't have
> it anyway.
> 
> >>>> Signed-off-by: Sergei Shtylyov<sshtylyov at ru.mvista.com>
> >>>> Signed-off-by: Sekhar Nori<nsekhar at ti.com>
> 
> >>>     Russell, you have recently discarded this patch from your patch
> >>> system. Can we know the reason?
> 
> >> It was recently discussed with TI, and various people raised concerns
> >> about it.  I don't remember the exact details, and I wish they'd raise
> >> them with the patch author directly.  It may have been that it's
> >> inventing its own API rather than using something like the DMA engine
> >> API.
> 
> >> Adding linux-omap to try to get a response there.
> 
> > Sergei,
> > This issue was discussed recently at TI and proposal was to place it to
> > drivers/dma folder.
> 
>     Note that I have neither time nor inclination to do this work (not do
> I think it's even feasible), so it will have to fall on TI's shoulders...

This is fine. No issues. We will discuss this at length at linux-usb list.

> 
> > Moreover, even Felipe also seems to move other musb
> > DMAs (Inventra, CPPI3.0, TUSB) to drivers/dma.
> 
>     Frankly speaking, I doubt that drivers/dma/ will have place for the
> purely MUSB specific DMA engines such as the named ones (there's no TUSB
> DMA BTW it uses OMAP DMA).
I think we will get more clarity once we start on this activity.

Thanks,
Ajay
> 
> > Regards,
> > Ajay
> 
> WBR, Sergei