If you absolutely need it, use a separate uC / “trigger” chip for PD negotiation.

I think the GP's point is that this requires a 12V-capable USB power supply.

I have converted pretty much everything I have to USB-C, from toothbrushes to old laptops, and am very happy with the results. My solution is to only own high-quality power supplies with good support for PD. Having done this, the question "Why isn't this thing charging?" doesn't really arise.

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amluto 2 days ago | parent [-]

The common device that this doesn’t work well for is the Raspberry Pi 5. For full power mode it needs an unusual 5V/5A power supply, and that is quite unusual.

	▲	Dylan16807 2 days ago \| parent \| next [-]
		Specifically it needs a supply that offers 5V/5A as a basic profile outside of PPS (programmable power supply), because the Pi doesn't support PPS negotiations. That is what's so rare, much more than the actual ability to do 5V/5A.
	▲	klysm 2 days ago \| parent \| prev [-]
		It’s more than unusual, it violates the spec. However you only need that to have full power USB