On Tue, 2020-02-25 at 16:15 +0100, Andrew Lunn wrote: > Looking at it bottom up, is the WWAN device itself made up of multiple > devices? Are the TTYs separate drivers to the packet moving engines? Possibly, yes, it depends a bit. > They have there own USB end points, and could just be standard CDC > ACM? Yeah, for a lot of USB devices that's indeed the case. > driver/base/component.c could be useful for bringing together these > individual devices to form the whole WWAN device. Huh, I was unaware of this, I'll take a look! A very brief look suggests that it wants to have a driver for the whole thing in the end, which isn't really true here, but perhaps we could "make one up" and have that implement the userspace API. I need to take a closer look, thanks for the pointer. > Plus you need to avoid confusion by not adding another "component > framework" which means something totally different to the existing > component framework. :) johannes
