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This change adds 3-wire mode support in STM32 SPI master driver.
BUG=chromium:688979
TEST=manual
enable CONFIG_SPI_HALFDUPLEX
read id from SPI heatmap sensor
BRANCH=none
Change-Id: I09139dcbfe39a427721451db6842ea712abf2e33
Signed-off-by: Rong Chang <rongchang@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/444630
Reviewed-by: Wei-Ning Huang <wnhuang@chromium.org>
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>