On Mon, Sep 22, 2025 at 09:20:34AM +0800, Chaoyi Chen wrote: > From: Chaoyi Chen <[email protected]> > > The RK3399 SoC integrates two USB/DP combo PHYs, each of which > supports software-configurable pin mapping and DisplayPort lane > assignment. These capabilities enable the PHY itself to handle both > mode switching and orientation switching, based on the Type-C plug > orientation and USB PD negotiation results. > > While an external Type-C controller is still required to detect cable > attachment and report USB PD events, the actual mode and orientation > switching is performed internally by the PHY through software > configuration. This allows the PHY to act as a Type-C multiplexer for > both data role and DP altmode configuration. > > To reflect this hardware design, this patch introduces a new > "mode-switch" property for the dp-port node in the device tree bindings. > This property indicates that the connected PHY is capable of handling > Type-C mode switching itself. > > Signed-off-by: Chaoyi Chen <[email protected]> > > Acked-by: Krzysztof Kozlowski <[email protected]> > --- > > Changes in v4: > - Remove "|" in description. > > Changes in v3: > - Add more descriptions to clarify the role of the PHY in switching. > > Changes in v2: > - Reuse dp-port/usb3-port in rk3399-typec-phy binding. > > .../devicetree/bindings/phy/rockchip,rk3399-typec-phy.yaml | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git > a/Documentation/devicetree/bindings/phy/rockchip,rk3399-typec-phy.yaml > b/Documentation/devicetree/bindings/phy/rockchip,rk3399-typec-phy.yaml > index 91c011f68cd0..83ebcde096ea 100644 > --- a/Documentation/devicetree/bindings/phy/rockchip,rk3399-typec-phy.yaml > +++ b/Documentation/devicetree/bindings/phy/rockchip,rk3399-typec-phy.yaml > @@ -51,6 +51,12 @@ properties: > '#phy-cells': > const: 0 > > + mode-switch:
Having the mode-switch here is a bit strange. I think the whole PHY device should be an orientation-switch and mode-switch. Otherwise it feels weird to me. > + description: > + Indicates the PHY can handle altmode switching. In this case, > + requires an external USB Type-C controller to report USB PD > message. > + type: boolean > + > port: > $ref: /schemas/graph.yaml#/properties/port > description: Connection to USB Type-C connector > -- > 2.49.0 > -- With best wishes Dmitry
