spi: atmel: Use core SPI_MASTER_MUST_[RT]X handling
We need both RX and TX data for each transfer in any case (PIO, PDC, DMA). So convert the driver to the core dummy buffer handling with the SPI_MASTER_MUST_RX/SPI_MASTER_MUST_TX infrastructure. This move changes the maximum PDC/DMA buffer handling to 65535 bytes instead of a single page and sets master->max_dma_len to this value. All dummy buffer management is removed from the driver. Signed-off-by:Nicolas Ferre <nicolas.ferre@atmel.com> Signed-off-by:
Mark Brown <broonie@kernel.org>
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