On Mon, Jun 02, 2014 at 03:38:11PM +0200, Geert Uytterhoeven wrote: > The SPI DMA core framework needs both RX and TX DMA to function. As a > preparation for converting the driver to use this framework, fall back to > PIO if no DMA channel or only one DMA channel is available. > This affects only RSPI, which could do DMA transfers for TX-only before. > RSPI-RZ and QSPI (at least for Single SPI Transfers) will need both RX and > TX DMA anyway. Hrm, was this error handling or is it a hardware limitation that it can only do DMA in one direction? Perhaps the core ought to be changed to support that if it's a hardware limit, I honestly hadn't considered that possibility when I wrote the code.
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