dt-bindings: display: rockchip: Convert cdn-dp-rockchip.txt to yaml

Convert cdn-dp-rockchip.txt to yaml.

Add new "port@1" property which represents the CDN DP output to keep
the same style as the other display interfaces.

This patch also changes the constraints for "phys" and "extcon". For
the original binding, only one phy and the corresponding extcon can
be specified. In the new binding, one or two phys can be specified.
Since the RK3399 has two DP-USB PHYs, specifying one allows output
via the corresponding PHY, while specifying two lets the driver
choose one PHY for output. This rule also applies to extcon, which
provides the cable state for the corresponding PHY.

Signed-off-by: Chaoyi Chen <chaoyi.chen@rock-chips.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20250520024718.142-3-kernel@airkyi.com
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>

2 files changed, 170 insertions, 74 deletions

diff --git a/Documentation/devicetree/bindings/display/rockchip/cdn-dp-rockchip.txt b/Documentation/devicetree/bindings/display/rockchip/cdn-dp-rockchip.txt
deleted file mode 100644
index 8df7d2e393d6..000000000000
--- a/Documentation/devicetree/bindings/display/rockchip/cdn-dp-rockchip.txt
+++ /dev/null
@@ -1,74 +0,0 @@
-Rockchip RK3399 specific extensions to the cdn Display Port
-================================
-
-Required properties:
-- compatible: must be "rockchip,rk3399-cdn-dp"
-
-- reg: physical base address of the controller and length
-
-- clocks: from common clock binding: handle to dp clock.
-
-- clock-names: from common clock binding:
-	       Required elements: "core-clk" "pclk" "spdif" "grf"
-
-- resets : a list of phandle + reset specifier pairs
-- reset-names : string of reset names
-		Required elements: "apb", "core", "dptx", "spdif"
-- power-domains : power-domain property defined with a phandle
-		  to respective power domain.
-- assigned-clocks: main clock, should be <&cru SCLK_DP_CORE>
-- assigned-clock-rates : the DP core clk frequency, shall be: 100000000
-
-- rockchip,grf: this soc should set GRF regs, so need get grf here.
-
-- ports: contain a port nodes with endpoint definitions as defined in
-	 Documentation/devicetree/bindings/media/video-interfaces.txt.
-	 contained 2 endpoints, connecting to the output of vop.
-
-- phys: from general PHY binding: the phandle for the PHY device.
-
-- extcon: extcon specifier for the Power Delivery
-
-- #sound-dai-cells = it must be 1 if your system is using 2 DAIs: I2S, SPDIF
-
--------------------------------------------------------------------------------
-
-Example:
-	cdn_dp: dp@fec00000 {
-		compatible = "rockchip,rk3399-cdn-dp";
-		reg = <0x0 0xfec00000 0x0 0x100000>;
-		interrupts = <GIC_SPI 9 IRQ_TYPE_LEVEL_HIGH>;
-		clocks = <&cru SCLK_DP_CORE>, <&cru PCLK_DP_CTRL>,
-			 <&cru SCLK_SPDIF_REC_DPTX>, <&cru PCLK_VIO_GRF>;
-		clock-names = "core-clk", "pclk", "spdif", "grf";
-		assigned-clocks = <&cru SCLK_DP_CORE>;
-		assigned-clock-rates = <100000000>;
-		power-domains = <&power RK3399_PD_HDCP>;
-		phys = <&tcphy0_dp>, <&tcphy1_dp>;
-		resets = <&cru SRST_DPTX_SPDIF_REC>;
-		reset-names = "spdif";
-		extcon = <&fusb0>, <&fusb1>;
-		rockchip,grf = <&grf>;
-		#address-cells = <1>;
-		#size-cells = <0>;
-		#sound-dai-cells = <1>;
-
-		ports {
-			#address-cells = <1>;
-			#size-cells = <0>;
-
-			dp_in: port {
-				#address-cells = <1>;
-				#size-cells = <0>;
-				dp_in_vopb: endpoint@0 {
-					reg = <0>;
-					remote-endpoint = <&vopb_out_dp>;
-				};
-
-				dp_in_vopl: endpoint@1 {
-					reg = <1>;
-					remote-endpoint = <&vopl_out_dp>;
-				};
-			};
-		};
-	};
diff --git a/Documentation/devicetree/bindings/display/rockchip/rockchip,rk3399-cdn-dp.yaml b/Documentation/devicetree/bindings/display/rockchip/rockchip,rk3399-cdn-dp.yaml
new file mode 100644
index 000000000000..1a33128e77f5
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/rockchip/rockchip,rk3399-cdn-dp.yaml
@@ -0,0 +1,170 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/rockchip/rockchip,rk3399-cdn-dp.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Rockchip RK3399 specific extensions to the CDN Display Port
+
+maintainers:
+  - Andy Yan <andy.yan@rock-chip.com>
+  - Heiko Stuebner <heiko@sntech.de>
+  - Sandy Huang <hjc@rock-chips.com>
+
+allOf:
+  - $ref: /schemas/sound/dai-common.yaml#
+
+properties:
+  compatible:
+    items:
+      - const: rockchip,rk3399-cdn-dp
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    items:
+      - description: DP core work clock
+      - description: APB clock
+      - description: SPDIF interface clock
+      - description: GRF clock
+
+  clock-names:
+    items:
+      - const: core-clk
+      - const: pclk
+      - const: spdif
+      - const: grf
+
+  extcon:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    minItems: 1
+    items:
+      - description: Extcon device providing the cable state for DP PHY device 0
+      - description: Extcon device providing the cable state for DP PHY device 1
+    description:
+      List of phandle to the extcon device providing the cable state for the DP PHY.
+
+  interrupts:
+    maxItems: 1
+
+  phys:
+    minItems: 1
+    items:
+      - description: DP output to the DP PHY device 0
+      - description: DP output to the DP PHY device 1
+    description:
+      RK3399 have two DP-USB PHY, specifying one PHY which want to use, or
+      specify two PHYs here to let the driver determine which PHY to use.
+
+  ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+
+    properties:
+      port@0:
+        $ref: /schemas/graph.yaml#/properties/port
+        description: Input of the CDN DP
+
+        properties:
+          endpoint@0:
+            description: Connection to the VOPB
+
+          endpoint@1:
+            description: Connection to the VOPL
+
+      port@1:
+        $ref: /schemas/graph.yaml#/properties/port
+        description: Output of the CDN DP
+
+    required:
+      - port@0
+      - port@1
+
+  power-domains:
+    maxItems: 1
+
+  resets:
+    maxItems: 4
+
+  reset-names:
+    items:
+      - const: spdif
+      - const: dptx
+      - const: apb
+      - const: core
+
+  rockchip,grf:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description:
+      Phandle to GRF register to control HPD.
+
+  "#sound-dai-cells":
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - interrupts
+  - phys
+  - ports
+  - resets
+  - reset-names
+  - rockchip,grf
+  - "#sound-dai-cells"
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/rk3399-cru.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/power/rk3399-power.h>
+    soc {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        dp@fec00000 {
+            compatible = "rockchip,rk3399-cdn-dp";
+            reg = <0x0 0xfec00000 0x0 0x100000>;
+            assigned-clocks = <&cru SCLK_DP_CORE>;
+            assigned-clock-rates = <100000000>;
+            interrupts = <GIC_SPI 9 IRQ_TYPE_LEVEL_HIGH>;
+            clocks = <&cru SCLK_DP_CORE>, <&cru PCLK_DP_CTRL>, <&cru SCLK_SPDIF_REC_DPTX>,
+                    <&cru PCLK_VIO_GRF>;
+            clock-names = "core-clk", "pclk", "spdif", "grf";
+            power-domains = <&power RK3399_PD_HDCP>;
+            phys = <&tcphy0_dp>, <&tcphy1_dp>;
+            resets = <&cru SRST_DPTX_SPDIF_REC>, <&cru SRST_P_UPHY0_DPTX>,
+                    <&cru SRST_P_UPHY0_APB>, <&cru SRST_DP_CORE>;
+            reset-names = "spdif", "dptx", "apb", "core";
+            rockchip,grf = <&grf>;
+            #sound-dai-cells = <1>;
+
+            ports {
+                #address-cells = <1>;
+                #size-cells = <0>;
+
+                dp_in: port@0 {
+                    reg = <0>;
+                    #address-cells = <1>;
+                    #size-cells = <0>;
+
+                    dp_in_vopb: endpoint@0 {
+                        reg = <0>;
+                        remote-endpoint = <&vopb_out_dp>;
+                    };
+
+                    dp_in_vopl: endpoint@1 {
+                        reg = <1>;
+                        remote-endpoint = <&vopl_out_dp>;
+                    };
+                };
+
+                dp_out: port@1 {
+                    reg = <1>;
+                };
+            };
+        };
+    };