[PATCH v4 0/3] serial: fsl_lpuart: add DMA support

[Shawn Guo]

On Tue, Feb 11, 2014 at 05:34:49AM +0000, Yao Yuan wrote:
> Here I also have a confusion.
> IRQ is must. But DMA isn't very necessary.
> How to deal with if one board is need DMA but another is not need?
> You mean if DMA is be support once all of them must use dma as first?

That's the point.  Why whether using DMA or not is a board decision?
The DMA resource should be defined at SoC level from the beginning
just like IO and interrupt resource.  And using DMA or PIO should be a
decision made by device driver not device tree.

Shawn