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23ea0c9fa3
Extend the SPI master API to be able to do fancier transactions: - allow to read the incoming bits while transmitting. If SPI_READBACK_ALL is set in 'rxlen' when calling spi_transaction(), then the received data during transmission is recorded in rxdata buffer and the function assumes that the real 'rxlen' is equal to 'txlen'. - add spi_transaction_wait() which is similar to spi_transaction_flush() but without de-asserting the chip select, so we can chain several transfers in a single transaction. Implement them for STM32. Signed-off-by: Vincent Palatin <vpalatin@chromium.org> BRANCH=none BUG=b:35648259 TEST=on Eve, use the FP sensor with the passthru. Change-Id: Iebff617acd3230277d36a4f565766b7748721a1d Reviewed-on: https://chromium-review.googlesource.com/452898 Commit-Ready: Vincent Palatin <vpalatin@chromium.org> Tested-by: Vincent Palatin <vpalatin@chromium.org> Reviewed-by: Todd Broch <tbroch@chromium.org>