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

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Date:	Fri, 13 Jan 2012 10:09:32 -0800
From:	Greg KH <greg@...ah.com>
To:	"Gupta, Ajay Kumar" <ajay.gupta@...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

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.)

Second, that sounds fine, please post patches.

thanks,

greg k-h
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