Commits
Maxime Chevallier committed f68a7dcb91b
spi: a3700: Add full-duplex support The armada 3700 SPI controller has support for full-duplex transfers, but it can only be done without using the hardware FIFOs. A full duplex transfer is done by shifting 4 bytes at a time, or even one byte at a time for transfers less than 4 bytes long. While this method is perfectly suitable for small transfers, it is still slower than using the FIFOs. This commit implement full-duplex support, making sure that half-duplex transfers are still done using the FIFOs with the existing method. Some setup functions were moved around to make sure the controller is properly configured before beginning each transfer. This was tested on EspressoBin with a logical analyser, and a simple setup where MISO is connected on MOSI. Transfers were made from userspace using spidev and spi-pipe from the spi-tools project Signed-off-by: Maxime Chevallier <maxime.chevallier@smile.fr> Signed-off-by: Mark Brown <broonie@kernel.org>