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What's UCSI? PDCs are "Power Delivery Controllers". It refers to an IC which manages PD communication for a USB-C port. UCSI stands for "USB Type-C Connector System Software Interface". It is a specification maintained by the USB-IF which defines a standardized interface for communicating with PDCs. I'll update the description in the v3 series to provide the full name for both of these terms. > This is the exact same binding as google,cros-ec-typec.yaml. Why are you > duplicating the whole thing rather than just adding a new compatible > string? I separated these bindings because they are associated with separate mutually exclusive drivers. But, I'm fine with adding this as a compatibility string in google,cros-ec-typec.yaml and will make that change in the v3 series.