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 -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
