[PATCH v2 1/3] dmaengine: mpc512x: add device tree binding document
mark.rutland at arm.com
Sat Jul 5 03:04:44 EST 2014
Apologies for the late reply. DT-related email is somewhat a firehose
and unfortunately I lose track of things.
On Thu, Jun 19, 2014 at 02:59:19PM +0100, Alexander Popov wrote:
> 2014-06-18 18:56 GMT+04:00 Alexander Popov <a13xp0p0v88 at gmail.com>:
> > 2014-06-18 17:37 GMT+04:00 Mark Rutland <mark.rutland at arm.com>:
> >> On Wed, Jun 18, 2014 at 11:48:10AM +0100, Alexander Popov wrote:
> >>> Introduce a device tree binding document for the MPC512x DMA controller
> >>> +Optional properties:
> >>> +- #dma-cells: the length of the DMA specifier, must be <1>.
> >>> + Each channel of this DMA controller has a peripheral request line,
> >>> + the assignment is fixed in hardware. This one cell
> >>> + in dmas property of a client device represents the channel number.
> >> Surely this is required to be able to refer to DMA channels on the
> >> device?
> > Excuse me, I didn't understand your question.
> > Do you inquire about the reason of making #dma-cells an optional property?
> > It's optional because device tree based lookup support is made
> > optional (part 3/3).
> Mark, did I answer your question?
> Should I fix anything in this patch series?
I would move it under required properties even if we happen to not use
it in certain edge cases.
Moving forwards everything should be DT-driven, so it'll be necessary.
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