chromeec: Add support for controlling USB port power

This maps a bit field to the EC (EC_ACPI_MEM_USB_PORT_POWER) that can be
used to control the power state of up to 8 individual USB ports. Some
Chromeboxes have their GPIO pins for controlling USB port power wired to
the EC, so they cannot be accessed directly by coreboot.

Change-Id: I6a362c2b868b296031a4170c15e7c0dedbb870b8
Signed-off-by: Emil Lundmark <>
Tested-by: build bot (Jenkins) <>
Reviewed-by: Patrick Georgi <>
2 files changed