dt-bindings: phy: add rockchip usbdp combo phy document

Add device tree binding document for Rockchip USBDP Combo PHY
with Samsung IP block.
Co-developed-by: Frank Wang <frank.wang@rock-chips.com>
Signed-off-by: Frank Wang <frank.wang@rock-chips.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Link: https://lore.kernel.org/r/20240408225109.128953-2-sebastian.reichel@collabora.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

Documentation/devicetree/bindings/phy/phy-rockchip-usbdp.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/phy/phy-rockchip-usbdp.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Rockchip USBDP Combo PHY with Samsung IP block
+
+maintainers:
+  - Frank Wang <frank.wang@rock-chips.com>
+  - Zhang Yubing <yubing.zhang@rock-chips.com>
+
+properties:
+  compatible:
+    enum:
+      - rockchip,rk3588-usbdp-phy
+
+  reg:
+    maxItems: 1
+
+  "#phy-cells":
+    description: |
+      Cell allows setting the type of the PHY. Possible values are:
+      - PHY_TYPE_USB3
+      - PHY_TYPE_DP
+    const: 1
+
+  clocks:
+    maxItems: 4
+
+  clock-names:
+    items:
+      - const: refclk
+      - const: immortal
+      - const: pclk
+      - const: utmi
+
+  resets:
+    maxItems: 5
+
+  reset-names:
+    items:
+      - const: init
+      - const: cmn
+      - const: lane
+      - const: pcs_apb
+      - const: pma_apb
+
+  rockchip,dp-lane-mux:
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    minItems: 2
+    maxItems: 4
+    items:
+      maximum: 3
+    description:
+      An array of physical Type-C lanes indexes. Position of an entry
+      determines the DisplayPort (DP) lane index, while the value of an entry
+      indicates physical Type-C lane. The supported DP lanes number are 2 or 4.
+      e.g. for 2 lanes DP lanes map, we could have "rockchip,dp-lane-mux = <2,
+      3>;", assuming DP lane0 on Type-C phy lane2, DP lane1 on Type-C phy
+      lane3. For 4 lanes DP lanes map, we could have "rockchip,dp-lane-mux =
+      <0, 1, 2, 3>;", assuming DP lane0 on Type-C phy lane0, DP lane1 on Type-C
+      phy lane1, DP lane2 on Type-C phy lane2, DP lane3 on Type-C phy lane3. If
+      DP lanes are mapped by DisplayPort Alt mode, this property is not needed.
+
+  rockchip,u2phy-grf:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description:
+      Phandle to the syscon managing the 'usb2 phy general register files'.
+
+  rockchip,usb-grf:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description:
+      Phandle to the syscon managing the 'usb general register files'.
+
+  rockchip,usbdpphy-grf:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description:
+      Phandle to the syscon managing the 'usbdp phy general register files'.
+
+  rockchip,vo-grf:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description:
+      Phandle to the syscon managing the 'video output general register files'.
+      When select the DP lane mapping will request its phandle.
+
+  sbu1-dc-gpios:
+    description:
+      GPIO connected to the SBU1 line of the USB-C connector via a big resistor
+      (~100K) to apply a DC offset for signalling the connector orientation.
+    maxItems: 1
+
+  sbu2-dc-gpios:
+    description:
+      GPIO connected to the SBU2 line of the USB-C connector via a big resistor
+      (~100K) to apply a DC offset for signalling the connector orientation.
+    maxItems: 1
+
+  orientation-switch:
+    description: Flag the port as possible handler of orientation switching
+    type: boolean
+
+  mode-switch:
+    description: Flag the port as possible handler of altmode switching
+    type: boolean
+
+  port:
+    $ref: /schemas/graph.yaml#/properties/port
+    description:
+      A port node to link the PHY to a TypeC controller for the purpose of
+      handling orientation switching.
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - resets
+  - reset-names
+  - "#phy-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/rockchip,rk3588-cru.h>
+    #include <dt-bindings/reset/rockchip,rk3588-cru.h>
+
+    usbdp_phy0: phy@fed80000 {
+      compatible = "rockchip,rk3588-usbdp-phy";
+      reg = <0xfed80000 0x10000>;
+      #phy-cells = <1>;
+      clocks = <&cru CLK_USBDPPHY_MIPIDCPPHY_REF>,
+               <&cru CLK_USBDP_PHY0_IMMORTAL>,
+               <&cru PCLK_USBDPPHY0>,
+               <&u2phy0>;
+      clock-names = "refclk", "immortal", "pclk", "utmi";
+      resets = <&cru SRST_USBDP_COMBO_PHY0_INIT>,
+               <&cru SRST_USBDP_COMBO_PHY0_CMN>,
+               <&cru SRST_USBDP_COMBO_PHY0_LANE>,
+               <&cru SRST_USBDP_COMBO_PHY0_PCS>,
+               <&cru SRST_P_USBDPPHY0>;
+      reset-names = "init", "cmn", "lane", "pcs_apb", "pma_apb";
+      rockchip,u2phy-grf = <&usb2phy0_grf>;
+      rockchip,usb-grf = <&usb_grf>;
+      rockchip,usbdpphy-grf = <&usbdpphy0_grf>;
+      rockchip,vo-grf = <&vo0_grf>;
+    };