On Thu, Dec 11, 2014 at 05:31:05AM +0000, Kuninori Morimoto wrote:
>
> Hi Vinod
>
> > > When we set simple settings to DMAC, then, it works automatically as cyclic transfer.
> > > The usage of this DMA is very limited, so it is super simple.
> > > In addition, this is 2nd DMA which is needed on sound.
> > > 1st DMA is controled by rcar-dmac.c
> > > 2nd DMA is this
> > > almost all settings are set by 1st DMA, 2nd DMA is just relay.
> > okay that needs to be called out explicitly. While reading driver it wasn't
> > very clear
> > So which one is the 1st DMA, how will the client configure these two DMAs?
>
> 1st DMA is rcar-dma which was created by Laurent.
> And it has been sent to you now.
>
> ${LINUX}/sound/soc/sh/rcar/core.c
> is the user of these 2 dmac.
> 1st DMAC gets "from mem address", and "to reg address".
> 2nd DMAC gets "from reg address", and "to reg address".
> DMAC's ID are came from DT.
So how is the user expectations, will they configure both the engines?
--
~Vinod
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