spi: add SPI driver for STM32 family
Add a SPI master and slave driver for the L4, F4 and F3 STM32 SoCs families. Change-Id: I1faf5c97f992c91eba852fd126e7d3b83158993d Origin: Original Signed-off-by:Neil Armstrong <narmstrong@baylibre.com> Tested-by:
Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org> Tested-by:
Lee Jones <lee.jones@linaro.org>
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