On Tuesday 24 July 2012, Stephen Warren wrote:
> It seems that given there are two values for dma-names, there really are
> two channels; it's just that one channel is bi-directional, and the
> second has two alternatives.
>
> Still, I guess you could also view this as three separate channels
> instead. In which case, the text below makes sense.
>
> > 3. A device with three channels, one of which has two alternatives:
> >
> > dmas = <&dma0 1 4 /* first channel, data read */
> > &dma0 2 6 /* second channel, data write */
> > &dma1 1 0 /* third channel, error read */
> > &dma2 1 0>; /* third channel, ernative error read */
> > dma-names = "data", "data", "error", "error";
> >
A bidirectional channel would have only one request line, not two,
and we would write that as
dmas = <&dma0 3 4>; /* one channel on dmarq 4, read-write */
Arnd
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