- 0x06: Bump customer use word
- 0x28:
  - Port information: Drop try.Src - not needed and cofuses DR use
  - Type-C Current: Use weakest pullup - we only want to provide 500mA
    without a PD contract.
  - Over Voltage Protection Usage: Disconnect at trip point
  - Try.Src: Disable - wo have no interest in charging a laptop
  - Process Swap To Source: disable, we're a source initially
  - Process VCONN Swap: Disable, we're a VConn source initially
    and don't want to sink VConn
  - Initiate VCONN Swap: disable, we're a source initially if required.
  - Automatic Sink Capabilities Request: Disable, sink will make itself
    clear if necessary.
- 0x33:
  - Limit number of sink PDOs to 1 (leaving 5V/3A)
  - Use 0.5/1/3A min/normal/max operating current
- 0x37:
  - Autonegotiate Variable Sink Enable: disable, just support fixed
    sinks for now
  - Autonegotiate Battery Sink Enable: disable, just support fixed
    sinks for now
  - Offer priority: Choose highest current
  - Automatically Calculate Min Power Required: Disable
  - Minimum Power Required: 5W, that's enough as a start