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This allows the USB SPI bridge to be controlled from the host at a larger timescale than a single SPI transaction. This allows the host to signal that many transactions will take place and that the device should keep the SPI bridge enabled across them. This allows the device to hold the AP or other possible user of the SPI bus in reset while the bridge is enabled. Signed-off-by: Anton Staaf <robotboy@chromium.org> BRANCH=None BUG=None TEST=make buildall -j Change-Id: Ifd6f96b0ff47f35d853735d44e255a205b0e677a Reviewed-on: https://chromium-review.googlesource.com/232732 Tested-by: Anton Staaf <robotboy@chromium.org> Reviewed-by: Vincent Palatin <vpalatin@chromium.org> Commit-Queue: Anton Staaf <robotboy@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit