On Mon, Oct 16, 2023 at 04:32:55PM +0200, Neil Armstrong wrote: > On 16/10/2023 16:22, Rob Herring wrote: > > On Fri, Oct 13, 2023 at 01:38:05PM +0200, Luca Weiss wrote: > > > Allow specifying data-lanes to reverse the SBU muxing orientation where > > > necessary by the hardware design. > > > > What situation in the hardware design makes this necessary. Please > > describe the problem. > > > > > > > > Signed-off-by: Luca Weiss <luca.weiss@xxxxxxxxxxxxx> > > > --- > > > .../devicetree/bindings/usb/fcs,fsa4480.yaml | 29 +++++++++++++++++++++- > > > 1 file changed, 28 insertions(+), 1 deletion(-) > > > > > > diff --git a/Documentation/devicetree/bindings/usb/fcs,fsa4480.yaml b/Documentation/devicetree/bindings/usb/fcs,fsa4480.yaml > > > index f6e7a5c1ff0b..86f6d633c2fb 100644 > > > --- a/Documentation/devicetree/bindings/usb/fcs,fsa4480.yaml > > > +++ b/Documentation/devicetree/bindings/usb/fcs,fsa4480.yaml > > > @@ -32,10 +32,37 @@ properties: > > > type: boolean > > > port: > > > - $ref: /schemas/graph.yaml#/properties/port > > > + $ref: /schemas/graph.yaml#/$defs/port-base > > > description: > > > A port node to link the FSA4480 to a TypeC controller for the purpose of > > > handling altmode muxing and orientation switching. > > > + unevaluatedProperties: false > > > + > > > + properties: > > > + endpoint: > > > + $ref: /schemas/graph.yaml#/$defs/endpoint-base > > > + unevaluatedProperties: false > > > + > > > + properties: > > > + data-lanes: > > > + $ref: /schemas/types.yaml#/definitions/uint32-array > > > + description: > > > + Specifies how the AUX+/- lines are connected to SBU1/2. > > > > Doesn't this depend on the connector orientation? Or it is both that and > > the lines can be swapped on the PCB? > > > > Seems like an abuse of data-lanes which already has a definition which > > is not about swapping + and - differential lanes. > > The FSA acts as a mux between DP AUX, Audio lanes on one side and > the USB-C SBU lanes on the other side. > _______ ______ > | | | > |-- HP --| | > |-- MIC --| |or > SoC | | MUX |-- SBU1 ---> To the USB-C > Codec |-- AUX+ --| |-- SBU2 ---> connected > |-- AUX- --| | > ______| |____ | > > The SBU1 & SBU2 are connected to the USB-C connector, and the actual orientation > to the connected devices/cable/whatever is determined by the TPCM and the MUX in > the FSA4480 with be dynamically changed according to the CC1/CC2 detection and PD alt mode. > > But on the other side the orientation of the AUX+/AUX- connected to the SoC > is not tied to the USB-C orientation but how it's routed on the PCB. > > This describes how the AUX+/AUX- are physically routed to the FSA4480 chip. I'd hate for this ASCII art to go to waste. Please add this detail to the commit message. Rob
