Re: [PATCH 8/9] ARM: dts: iwg22d-sodimm: Sound DMA support via SRC on DTS

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On Thu, Dec 21, 2017 at 11:01:28AM +0000, Biju Das wrote:
> Hi Simon,
> 
> > -----Original Message-----
> > From: Simon Horman [mailto:horms@xxxxxxxxxxxx]
> > Sent: 21 December 2017 10:45
> > To: Biju Das <biju.das@xxxxxxxxxxxxxx>
> > Cc: Rob Herring <robh+dt@xxxxxxxxxx>; Mark Rutland
> > <mark.rutland@xxxxxxx>; Magnus Damm <magnus.damm@xxxxxxxxx>;
> > Chris Paterson <Chris.Paterson2@xxxxxxxxxxx>; Fabrizio Castro
> > <fabrizio.castro@xxxxxxxxxxxxxx>; devicetree@xxxxxxxxxxxxxxx; linux-renesas-
> > soc@xxxxxxxxxxxxxxx
> > Subject: Re: [PATCH 8/9] ARM: dts: iwg22d-sodimm: Sound DMA support via
> > SRC on DTS
> >
> > On Wed, Dec 20, 2017 at 08:02:04PM +0000, Biju Das wrote:
> > > DMA transfer to/from SRC
> > >
> > >      DMA      DMApp
> > > [MEM] -> [SRC] -> [SSIU] -> [SSI]
> > >
> > >      DMA      DMApp
> > > [MEM] <- [SRC] <- [SSIU] <- [SSI]
> > >
> > > Current sound driver is supporting SSI/SRC random connection.
> > > So, this patch is trying
> > > SSI3 -> SRC3
> > > SSI4 <- SRC4
> >
> > I am curious to know why the selection here differs from that present in
> > iwg20d-q7-common. Is it an arbitrary decision?
> >
> > Likewise for other uses of ssi*, src* and dvc* in this patchset.
> 
> For ssi*,  on this board, SSI3/4 interface is connected to Audio In/Out.
> 
> For src*,  the original bsp from iwave is using src3/src4, also it is arbitrary as per the data sheet.
> 
> For dvc*,  Again it is arbitrary as per the data sheet.

Thanks, understood.



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