dt-bindings: display: sitronix,st7701: document port and rotation

Panels are supposed to have one port (defined in panel-common.yaml
binding) and can have also rotation:

  rk3326-odroid-go3.dtb: panel@0: 'port', 'rotation' do not match any of the regexes: 'pinctrl-[0-9]+'
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
Link: https://lore.kernel.org/r/20230326204224.80181-4-krzysztof.kozlowski@linaro.orgSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/display/panel/sitronix,st7701.yaml

@@ -42,7 +42,9 @@ properties:
   IOVCC-supply:
     description: I/O system regulator
 
+  port: true
   reset-gpios: true
+  rotation: true
 
   backlight: true
 
@@ -51,6 +53,7 @@ required:
   - reg
   - VCC-supply
   - IOVCC-supply
+  - port
   - reset-gpios
 
 additionalProperties: false
@@ -70,5 +73,11 @@ examples:
             IOVCC-supply = <&reg_dldo2>;
             reset-gpios = <&pio 3 24 GPIO_ACTIVE_HIGH>; /* LCD-RST: PD24 */
             backlight = <&backlight>;
+
+            port {
+                mipi_in_panel: endpoint {
+                    remote-endpoint = <&mipi_out_panel>;
+                };
+            };
         };
     };