dt-bindings: usb: add ON Semiconductor nb7vpq904m Type-C Linear Redriver bindings

Document bindings for this ON Semiconductor Type-C USB SuperSpeed
and DisplayPort ALT Mode Linear Redriver.
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Message-ID: <20230601-topic-sm8x50-upstream-redriver-v3-1-988c560e2195@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/usb/onnn,nb7vpq904m.yaml

+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/usb/onnn,nb7vpq904m.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ON Semiconductor Type-C DisplayPort ALT Mode Linear Redriver
+
+maintainers:
+  - Neil Armstrong <neil.armstrong@linaro.org>
+
+properties:
+  compatible:
+    enum:
+      - onnn,nb7vpq904m
+
+  reg:
+    maxItems: 1
+
+  vcc-supply:
+    description: power supply (1.8V)
+
+  enable-gpios: true
+
+  retimer-switch:
+    description: Flag the port as possible handle of SuperSpeed signals retiming
+    type: boolean
+
+  orientation-switch:
+    description: Flag the port as possible handler of orientation switching
+    type: boolean
+
+  ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+    properties:
+      port@0:
+        $ref: /schemas/graph.yaml#/properties/port
+        description: Super Speed (SS) Output endpoint to the Type-C connector
+
+      port@1:
+        $ref: /schemas/graph.yaml#/$defs/port-base
+        description: Super Speed (SS) Input endpoint from the Super-Speed PHY
+        unevaluatedProperties: false
+
+        properties:
+          endpoint:
+            $ref: /schemas/graph.yaml#/$defs/endpoint-base
+            unevaluatedProperties: false
+
+            properties:
+              data-lanes:
+                $ref: /schemas/types.yaml#/definitions/uint32-array
+                description: |
+                  An array of physical data lane indexes. Position determines how
+                  lanes are connected to the redriver, It is assumed the same order
+                  is kept on the other side of the redriver.
+                  Lane number represents the following
+                  - 0 is RX2 lane
+                  - 1 is TX2 lane
+                  - 2 is TX1 lane
+                  - 3 is RX1 lane
+                  The position determines the physical port of the redriver, in the
+                  order A, B, C & D.
+                oneOf:
+                  - items:
+                      - const: 0
+                      - const: 1
+                      - const: 2
+                      - const: 3
+                    description: |
+                      This is the lanes default layout
+                      - Port A to RX2 lane
+                      - Port B to TX2 lane
+                      - Port C to TX1 lane
+                      - Port D to RX1 lane
+                  - items:
+                      - const: 3
+                      - const: 2
+                      - const: 1
+                      - const: 0
+                    description: |
+                      This is the USBRX2/USBTX2 and USBRX1/USBTX1 swapped lanes layout
+                      - Port A to RX1 lane
+                      - Port B to TX1 lane
+                      - Port C to TX2 lane
+                      - Port D to RX2 lane
+
+      port@2:
+        $ref: /schemas/graph.yaml#/properties/port
+        description:
+          Sideband Use (SBU) AUX lines endpoint to the Type-C connector for the purpose of
+          handling altmode muxing and orientation switching.
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        typec-mux@32 {
+            compatible = "onnn,nb7vpq904m";
+            reg = <0x32>;
+
+            vcc-supply = <&vreg_l15b_1p8>;
+
+            retimer-switch;
+            orientation-switch;
+
+            ports {
+                #address-cells = <1>;
+                #size-cells = <0>;
+
+                port@0 {
+                    reg = <0>;
+                    usb_con_ss: endpoint {
+                        remote-endpoint = <&typec_con_ss>;
+                    };
+                };
+                port@1 {
+                    reg = <1>;
+                    phy_con_ss: endpoint {
+                        remote-endpoint = <&usb_phy_ss>;
+                        data-lanes = <3 2 1 0>;
+                    };
+                };
+                port@2 {
+                    reg = <2>;
+                    usb_con_sbu: endpoint {
+                        remote-endpoint = <&typec_dp_aux>;
+                    };
+                };
+            };
+        };
+    };
+...