On Thu, Jun 23, 2022 at 12:08 PM Stephen Boyd <swboyd@xxxxxxxxxxxx> wrote: > > Quoting Prashant Malani (2022-06-23 11:37:08) > > On Thu, Jun 23, 2022 at 11:24 AM Stephen Boyd <swboyd@xxxxxxxxxxxx> wrote: > > > > > > Quoting Prashant Malani (2022-06-22 10:34:35) > > > > From: Pin-Yen Lin <treapking@xxxxxxxxxxxx> > > > > > > > > ITE IT6505 can be used in systems to switch USB Type-C DisplayPort > > > > alternate mode lane traffic between 2 Type-C ports. > > > > > > How does it work? From what I can tell from the information I find when > > > googling this part[1] and looking at the existing binding doc is that > > > this device is a DPI to DP bridge, and it outputs DP (probably 4 lanes > > > of it?). Does the 2 type-c port design work by transmitting DP on two > > > lanes of DP for one type-c port and another two lanes of DP for the > > > other type-c port? > > > > > > DP could be one lane, so if this device is able to output one lane on > > > any output differential pair then I suspect it could support 4 type-c > > > ports if the hardware engineer connected it that way. Can you confirm my > > > suspicion? > > > > I will let Pin-Yen comment re: this hardware, but 1-lane DP is not a > > supported Type-C Pin assignment > > (as per VESA DP Alternate Mode Spec version 2.0 [2]), so the H/W > > Some missing link? My bad. I tried to find a publicly accessible link to the DP altmode spec, but it seems like one needs to be a VESA member to access it :/ > > > configuration you are suggesting shouldn't be possible. > > > > Alright, cool. But it is possible in the DP spec. So it seems like if > this is connected to 4 DP connectors it could be used to mux between DP > on 4 DP ports. Ack. In that case, no "typec-switches" should be added to the DT.
