dt-bindings: phy: Add Rockchip HDMI/eDP Combo PHY schema

Add dt-binding schema for the HDMI/eDP Transmitter Combo PHY found on
Rockchip RK3588 SoC.
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
Link: https://lore.kernel.org/r/20240214-phy-hdptx-v4-1-e7974f46c1a7@collabora.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

Documentation/devicetree/bindings/phy/rockchip,rk3588-hdptx-phy.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/phy/rockchip,rk3588-hdptx-phy.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Rockchip SoC HDMI/eDP Transmitter Combo PHY
+
+maintainers:
+  - Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
+
+properties:
+  compatible:
+    enum:
+      - rockchip,rk3588-hdptx-phy
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    items:
+      - description: Reference clock
+      - description: APB clock
+
+  clock-names:
+    items:
+      - const: ref
+      - const: apb
+
+  "#phy-cells":
+    const: 0
+
+  resets:
+    items:
+      - description: PHY reset line
+      - description: APB reset line
+      - description: INIT reset line
+      - description: CMN reset line
+      - description: LANE reset line
+      - description: ROPLL reset line
+      - description: LCPLL reset line
+
+  reset-names:
+    items:
+      - const: phy
+      - const: apb
+      - const: init
+      - const: cmn
+      - const: lane
+      - const: ropll
+      - const: lcpll
+
+  rockchip,grf:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description: Some PHY related data is accessed through GRF regs.
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - "#phy-cells"
+  - resets
+  - reset-names
+  - rockchip,grf
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/rockchip,rk3588-cru.h>
+    #include <dt-bindings/reset/rockchip,rk3588-cru.h>
+
+    soc {
+      #address-cells = <2>;
+      #size-cells = <2>;
+
+      phy@fed60000 {
+        compatible = "rockchip,rk3588-hdptx-phy";
+        reg = <0x0 0xfed60000 0x0 0x2000>;
+        clocks = <&cru CLK_USB2PHY_HDPTXRXPHY_REF>, <&cru PCLK_HDPTX0>;
+        clock-names = "ref", "apb";
+        #phy-cells = <0>;
+        resets = <&cru SRST_HDPTX0>, <&cru SRST_P_HDPTX0>,
+                 <&cru SRST_HDPTX0_INIT>, <&cru SRST_HDPTX0_CMN>,
+                 <&cru SRST_HDPTX0_LANE>, <&cru SRST_HDPTX0_ROPLL>,
+                 <&cru SRST_HDPTX0_LCPLL>;
+        reset-names = "phy", "apb", "init", "cmn", "lane", "ropll", "lcpll";
+        rockchip,grf = <&hdptxphy_grf>;
+      };
+    };