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.
Best regards
---
Kuninori Morimoto
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