dt-bindings: display: rockchip: Add schema for RK3588 DPTX Controller

The Rockchip RK3588 SoC integrates the Synopsys DesignWare DPTX
controller. And this DPTX controller need share a USBDP PHY with
the USB 3.0 OTG controller during operation.

Signed-off-by: Andy Yan <[e-mail]>
Reviewed-by: Rob Herring (Arm) <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Dmitry Baryshkov <[e-mail]>

Documentation/devicetree/bindings/display/rockchip/rockchip,dw-dp.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/rockchip/rockchip,dw-dp.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Rockchip DW DisplayPort Transmitter
+
+maintainers:
+  - Andy Yan <[e-mail]>
+
+description: |
+  The Rockchip RK3588 SoC integrates the Synopsys DesignWare DPTX controller
+  which is compliant with the DisplayPort Specification Version 1.4 with the
+  following features:
+
+  * DisplayPort 1.4a
+  * Main Link: 1/2/4 lanes
+  * Main Link Support 1.62Gbps, 2.7Gbps, 5.4Gbps and 8.1Gbps
+  * AUX channel 1Mbps
+  * Single Stream Transport(SST)
+  * Multistream Transport (MST)
+  * Type-C support (alternate mode)
+  * HDCP 2.2, HDCP 1.3
+  * Supports up to 8/10 bits per color component
+  * Supports RBG, YCbCr4:4:4, YCbCr4:2:2, YCbCr4:2:0
+  * Pixel clock up to 594MHz
+  * I2S, SPDIF audio interface
+
+allOf:
+  - $ref: /schemas/sound/dai-common.yaml#
+
+properties:
+  compatible:
+    enum:
+      - rockchip,rk3588-dp
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    items:
+      - description: Peripheral/APB bus clock
+      - description: DisplayPort AUX clock
+      - description: HDCP clock
+      - description: I2S interface clock
+      - description: SPDIF interfce clock
+
+  clock-names:
+    items:
+      - const: apb
+      - const: aux
+      - const: hdcp
+      - const: i2s
+      - const: spdif
+
+  phys:
+    maxItems: 1
+
+  ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+
+    properties:
+      port@0:
+        $ref: /schemas/graph.yaml#/properties/port
+        description: Video port for RGB/YUV input.
+
+      port@1:
+        $ref: /schemas/graph.yaml#/properties/port
+        description: Video port for DP output.
+
+    required:
+      - port@0
+      - port@1
+
+  power-domains:
+    maxItems: 1
+
+  resets:
+    maxItems: 1
+
+  "#sound-dai-cells":
+    const: 0
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - interrupts
+  - phys
+  - ports
+  - resets
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/rockchip,rk3588-cru.h>
+    #include <dt-bindings/phy/phy.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/power/rk3588-power.h>
+    #include <dt-bindings/reset/rockchip,rk3588-cru.h>
+
+    soc {
+      #address-cells = <2>;
+      #size-cells = <2>;
+
+      dp@fde50000 {
+        compatible = "rockchip,rk3588-dp";
+        reg = <0x0 0xfde50000 0x0 0x4000>;
+        interrupts = <GIC_SPI 161 IRQ_TYPE_LEVEL_HIGH 0>;
+        clocks = <&cru PCLK_DP0>, <&cru CLK_AUX16M_0>,
+        <&cru CLK_DP0>, <&cru MCLK_I2S4_8CH_TX>,
+        <&cru MCLK_SPDIF2_DP0>;
+        clock-names = "apb", "aux", "hdcp", "i2s", "spdif";
+        assigned-clocks = <&cru CLK_AUX16M_0>;
+        assigned-clock-rates = <16000000>;
+        resets = <&cru SRST_DP0>;
+        phys = <&usbdp_phy0 PHY_TYPE_DP>;
+        power-domains = <&power RK3588_PD_VO0>;
+        #sound-dai-cells = <0>;
+
+
+        ports {
+          #address-cells = <1>;
+          #size-cells = <0>;
+
+          port@0 {
+            reg = <0>;
+
+            dp0_in_vp2: endpoint {
+              remote-endpoint = <&vp2_out_dp0>;
+            };
+          };
+
+          port@1 {
+            reg = <1>;
+
+            dp0_out_con0: endpoint {
+              remote-endpoint = <&dp_con0_in>;
+            };
+          };
+        };
+      };
+    };