On 25/08/2021 16:53, Bjorn Andersson wrote:
But in the case of Type-C altmode several of our boards have either an
external gpio-based SBU-pin-swapper or some redriver on I2C with this
functionality, so we need a way to tell both the PHY and this external
contraption about the orientation.
Its a very similar problem to orientation switch
As an example
- redriver may need to fix up signal integrity for
lane switching
- PHY needs to toggle lanes from one IP block to another
I don't think off the top of my head a USB controller or DPU cares much
about the orientation switch but for argument sake you could add one to
that list.
I _think_ the type-c mux layer handles this though, as in what we did on
RB5 has PHY and redriver receiving and reacting to a type-c orientation
switch both with the existing type-c port driver and the new tcpm.
+ Dmitry - he did the mux work on the PHY and the redriver
Seems to me that the type-c mux way of diseminating to more than one
place might fight role-switching well too.
