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P1B adds 2 new GPIO signals to explicitly control the 1.5 vs 3.0 current limit selection. In addition, the use case for the 5V enable gpio changes to on/off and no longer needs to be toggled between input and output. This change is tied to the board version so that the operation for P1 and older boards is unaffected. BUG=chrome-os-partner:61431 BRANCH=none TEST=Manual Connected display adapter into C0 port and verified gpio signals: 1 USB_C0_5V_EN 0* USB_C1_5V_EN 1* EN_USB_C0_3A 0 EN_USB_C1_3A Then connect another adapter to C1: 1 USB_C0_5V_EN 1* USB_C1_5V_EN 0* EN_USB_C0_3A 0 EN_USB_C1_3A Remove adapter from C0: 0* USB_C0_5V_EN 1 USB_C1_5V_EN 0 EN_USB_C0_3A 1* EN_USB_C1_3A Also tested P1 system to verify that the correct board version is read and the signals match the expected value. Change-Id: Iebab84304a33282c766b8963dba4a56052a295c7 Signed-off-by: Scott <scollyer@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/447866 Commit-Ready: Scott Collyer <scollyer@chromium.org> Tested-by: Scott Collyer <scollyer@chromium.org> Reviewed-by: Todd Broch <tbroch@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