spi: rspi: SPI DMA core needs both RX and TX DMA to function

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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.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Mark Brown <broonie@linaro.org>

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Geert Uytterhoeven 2014-06-02 15:38:11 +02:00 • committed by Mark Brown

parent fcdc49ae53

commit 5f338d0ce0

1 changed files with 14 additions and 22 deletions

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36

drivers/spi/spi-rspi.c

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