[PATCH v11 7/9] dt-bindings: display: bridge: it6505: Add mode-switch support

[Pin-yen Lin]

ITE IT6505 can be used in systems to switch the DP traffic between
two downstreams, which can be USB Type-C DisplayPort alternate mode
lane or regular DisplayPort output ports.

Update the binding to accommodate this usage by introducing a
data-lanes and a mode-switch property on endpoints.

Signed-off-by: Pin-yen Lin <treapking at chromium.org>

---

Changes in v11:
- Updated the description of the endpoints in the bindings
- Referenced video-interfaces.yaml instead for the endpoints binding
- Removed duplicated definitions from inherited schema

Changes in v9:
- Fixed subject prefix again
- Changed the naming of the example node for it6505

Changes in v8:
- Updated bindings for data-lanes property
- Fixed subject prefix

Changes in v7:
- Fixed issues reported by dt_binding_check.
- Updated the schema and the example dts for data-lanes.
- Changed to generic naming for the example dts node.

Changes in v6:
- Remove switches node and use endpoints and data-lanes property to
  describe the connections.

 .../bindings/display/bridge/ite,it6505.yaml   | 101 +++++++++++++++---
 1 file changed, 88 insertions(+), 13 deletions(-)

diff --git a/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml b/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
index b16a9d9127dd..8ae9c5cba22c 100644
--- a/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
+++ b/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
@@ -75,22 +75,49 @@ properties:
       port at 1:
         $ref: /schemas/graph.yaml#/$defs/port-base
         unevaluatedProperties: false
-        description: Video port for DP output
+        description:
+          Video port for DP output. Each endpoint connects to a video output
+          downstream, and the "data-lanes" property is used to describe the pin
+          connections. 0, 1, 2, 3 in "data-lanes" maps to TX0, TX1, TX2, TX3,
+          respectively.
 
-        properties:
-          endpoint:
-            $ref: /schemas/graph.yaml#/$defs/endpoint-base
+
+        patternProperties:
+          "^endpoint@[01]$":
+            $ref: /schemas/media/video-interfaces.yaml#
             unevaluatedProperties: false
 
             properties:
+              reg: true
+
+              remote-endpoint: true
+
               data-lanes:
-                minItems: 1
-                uniqueItems: true
-                items:
-                  - enum: [ 0, 1 ]
-                  - const: 1
-                  - const: 2
-                  - const: 3
+                oneOf:
+                  - items:
+                      - enum: [0, 1, 2, 3]
+
+                  - items:
+                      - const: 0
+                      - const: 1
+
+                  - items:
+                      - const: 2
+                      - const: 3
+
+                  - items:
+                      - const: 0
+                      - const: 1
+                      - const: 2
+                      - const: 3
+
+              mode-switch:
+                type: boolean
+                description: Register this node as a Type-C mode switch or not.
+
+            required:
+              - reg
+              - remote-endpoint
 
     required:
       - port at 0
@@ -102,7 +129,6 @@ required:
   - pwr18-supply
   - interrupts
   - reset-gpios
-  - extcon
   - ports
 
 additionalProperties: false
@@ -139,8 +165,11 @@ examples:
                 };
 
                 port at 1 {
+                    #address-cells = <1>;
+                    #size-cells = <0>;
                     reg = <1>;
-                    it6505_out: endpoint {
+                    it6505_out: endpoint at 0 {
+                        reg = <0>;
                         remote-endpoint = <&dp_in>;
                         data-lanes = <0 1>;
                     };
@@ -148,3 +177,49 @@ examples:
             };
         };
     };
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        dp-bridge at 5c {
+            compatible = "ite,it6505";
+            interrupts = <8 IRQ_TYPE_LEVEL_LOW 8 0>;
+            reg = <0x5c>;
+            pinctrl-names = "default";
+            pinctrl-0 = <&it6505_pins>;
+            ovdd-supply = <&mt6366_vsim2_reg>;
+            pwr18-supply = <&pp1800_dpbrdg_dx>;
+            reset-gpios = <&pio 177 0>;
+
+            ports {
+                #address-cells = <1>;
+                #size-cells = <0>;
+                port at 0 {
+                    reg = <0>;
+                    it6505_dpi_in: endpoint {
+                        remote-endpoint = <&dpi_out>;
+                    };
+                };
+                port at 1 {
+                    #address-cells = <1>;
+                    #size-cells = <0>;
+                    reg = <1>;
+                    ite_typec0: endpoint at 0 {
+                        reg = <0>;
+                        mode-switch;
+                        data-lanes = <0 1>;
+                        remote-endpoint = <&typec_port0>;
+                    };
+                    ite_typec1: endpoint at 1 {
+                        reg = <1>;
+                        mode-switch;
+                        data-lanes = <2 3>;
+                        remote-endpoint = <&typec_port1>;
+                    };
+                };
+            };
+        };
+    };
-- 
2.39.1.519.gcb327c4b5f-goog