[PATCH] DMA: get current descriptor data transfer count

[Russell King - ARM Linux]

On Fri, Sep 07, 2012 at 10:00:44AM +0000, Song, Elen wrote:
> 
> when data transfer by dma, we could know how many data transfered in one descriptor read DMAC_CTRLAx's btsize bit to get dma transfer size in this case, we could know how many data have been transfered even transaction timeout
> 
> Signed-off-by: Elen Song <elen.song at atmel.com>

NAK, please use the established API for this.