On Wed, May 04, 2016 at 02:01:57PM +0200, Krzysztof Kozlowski wrote:

This looks like pwrseq for MMC devices so the idea is to:
1. Move drivers/mmc/core/pwrseq* to separate directory
(drivers/power/pwrseq ?)
2. Add support for pwrseq to USB core,
3. Add new pwrseq driver (or extend existing one): toggling the regulator.
4. Add pwrseq phandle to the DT node of USB hub (to the binding
mentioned by Rob?).

Does it look sensible?

It certainly seems like a similar problem space, USB seems very much
like MMC in both the spec and the way it tends to get used.