linux-kernel - RE: RFC: usb: musb: Adding CPPI4.1 DMA driver under drivers/dma

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Date:	Mon, 16 Jan 2012 04:25:15 +0000
From:	"Gupta, Ajay Kumar" <ajay.gupta@...com>
To:	Greg KH <greg@...ah.com>
CC:	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: RFC: usb: musb: Adding CPPI4.1 DMA driver under drivers/dma

Hi,
> On Fri, Jan 13, 2012 at 10:40:50AM +0000, Gupta, Ajay Kumar wrote:
> > Hi,
> >
> > CPPI4.1 (Communication Port Programming Interface) is a TI specific
> DMA
> > controller used in multiple TI platform such as AM33x, DA8x, AM35x,
> TI81x.
> > The DMA engine is mainly used by musb controller on above platform.
> >
> > Earlier version of the driver was submitted by Sergei Shtylyov at [1]
> but
> > was not merged due to disagreement on the location of driver in
> kernel.
> > Refer the discussions at [1] for more details.
> >
> > [1] http://marc.info/?l=linux-usb&m=125087318308323
> >
> > The new implementation of the CPPI4.1 DMA slave driver will be in the
> > drivers/dma folder, complying to dmaengine framework.
> > It would involve changes in existing musb driver also for which
> current
> > plan is to maintain the compatibility of non-CPPI4.1 DMA in musb
> driver.
> >
> > The task is planned to be spitted into below subtasks.
> >
> > (1) Post RFC on the API details, changes envisaged in musb driver and
> other
> > challenges
> >
> > (2) Implement and post RFC for the CPPI4.1 DMA driver and changes
> needed in
> > musb driver.
> >
> > Let me know if you have any thoughts/comments on this.
> 
> First off, don't highjack threads (you responded to a linux-usb thread
> here, get a better email client please.)

Sorry for inconvenience, I will take care of this in future.

Thanks,
Ajay
> 
> Second, that sounds fine, please post patches.
> 
> thanks,
> 
> greg k-h
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