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rk3399 systems need terminations on the SPI signals in S3 and all other low power states. Add support for enabling the pulldowns and pullups on the correct pins. With this change, if BOARD_NEEDS_S3_TERM is set in the board properties, cr50 will enable a pulldown on the AP TX Cr50 RX signal and a pulldown on all of the SPS signals. To keep the pulldowns from interfering with the sps peripheral, s3_term will also disable the input for those signals. BUG=b:62200096 BRANCH=cr50 TEST=Flash onto bob. Make sure cr50 enables and disables terminations when the AP suspends/resumes. Flash onto reef. Make sure it doesn't do anything. Change-Id: I4adaf6d66160bab1eb3cf3d343d4a79524ccf883 Signed-off-by: Mary Ruthven <mruthven@google.com> Reviewed-on: https://chromium-review.googlesource.com/991338 Commit-Ready: Mary Ruthven <mruthven@chromium.org> Tested-by: Mary Ruthven <mruthven@chromium.org> Reviewed-by: Randall Spangler <rspangler@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit For instructions on building from source, refer to http://www.chromium.org/chromium-os/ec-development/getting-started-building-ec-images-quickly