On Wed, Nov 21, 2018 at 10:48 AM Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx> wrote: > > Hi Rob, > > On 21/11/2018 10:41:01-0600, Rob Herring wrote: > > > +Optional properties in serial and SPI mode: > > > +- dma bindings for dma transfer: > > > + - dmas: DMA specifier, consisting of a phandle to DMA controller node, > > > + memory peripheral interface and USART DMA channel ID, FIFO configuration. > > > + Refer to dma.txt and atmel-dma.txt for details. > > > + - dma-names: "rx" for RX channel, "tx" for TX channel. > > > > > + dma-names = "tx", "rx"; > > > > The dma-names should have a defined order. > > > > Why is that? Isn't the purpose of names to get rid of any particular > ordering? Because a fundamental rule of DT is the order is defined and important. The purpose was to allow for cases that had a variable number of entries, but even a variable number still have a defined order. Rob
