diff --git a/Documentation/devicetree/bindings/phy/spacemit,k1-combo-phy.yaml b/Documentation/devicetree/bindings/phy/spacemit,k1-combo-phy.yaml
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+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/phy/spacemit,k1-combo-phy.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: SpacemiT K1 PCIe/USB3 Combo PHY
+
+maintainers:
+  - Alex Elder <elder@riscstar.com>
+
+description: >
+  Of the three PHYs on the SpacemiT K1 SoC capable of being used for
+  PCIe, one is a combo PHY that can also be configured for use by a
+  USB 3 controller.  Using PCIe or USB 3 is a board design decision.
+
+  The combo PHY is also the only PCIe PHY that is able to determine
+  PCIe calibration values to use, and this must be determined before
+  the other two PCIe PHYs can be used.  This calibration must be
+  performed with the combo PHY in PCIe mode, and is this is done
+  when the combo PHY is probed.
+
+  The combo PHY uses an external oscillator as a reference clock.
+  During normal operation, the PCIe or USB port driver is responsible
+  for ensuring all other clocks needed by a PHY are enabled, and all
+  resets affecting the PHY are deasserted.  However, for the combo
+  PHY to perform calibration independent of whether it's later used
+  for PCIe or USB, all PCIe mode clocks and resets must be defined.
+
+properties:
+  compatible:
+    const: spacemit,k1-combo-phy
+
+  reg:
+    items:
+      - description: PHY control registers
+
+  clocks:
+    items:
+      - description: External oscillator used by the PHY PLL
+      - description: DWC PCIe Data Bus Interface (DBI) clock
+      - description: DWC PCIe application AXI-bus Master interface clock
+      - description: DWC PCIe application AXI-bus slave interface clock
+
+  clock-names:
+    items:
+      - const: refclk
+      - const: dbi
+      - const: mstr
+      - const: slv
+
+  resets:
+    items:
+      - description: PHY reset; remains deasserted after initialization
+      - description: DWC PCIe Data Bus Interface (DBI) reset
+      - description: DWC PCIe application AXI-bus Master interface reset
+      - description: DWC PCIe application AXI-bus slave interface reset
+
+  reset-names:
+    items:
+      - const: phy
+      - const: dbi
+      - const: mstr
+      - const: slv
+
+  spacemit,apmu:
+    description:
+      A phandle that refers to the APMU system controller, whose
+      regmap is used in setting the mode
+    $ref: /schemas/types.yaml#/definitions/phandle
+
+  "#phy-cells":
+    const: 1
+    description:
+      The argument value (PHY_TYPE_PCIE or PHY_TYPE_USB3) determines
+      whether the PHY operates in PCIe or USB3 mode.
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - resets
+  - reset-names
+  - spacemit,apmu
+  - "#phy-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/spacemit,k1-syscon.h>
+    phy@c0b10000 {
+        compatible = "spacemit,k1-combo-phy";
+        reg = <0xc0b10000 0x1000>;
+        clocks = <&vctcxo_24m>,
+                 <&syscon_apmu CLK_PCIE0_DBI>,
+                 <&syscon_apmu CLK_PCIE0_MASTER>,
+                 <&syscon_apmu CLK_PCIE0_SLAVE>;
+        clock-names = "refclk",
+                      "dbi",
+                      "mstr",
+                      "slv";
+        resets = <&syscon_apmu RESET_PCIE0_GLOBAL>,
+                 <&syscon_apmu RESET_PCIE0_DBI>,
+                 <&syscon_apmu RESET_PCIE0_MASTER>,
+                 <&syscon_apmu RESET_PCIE0_SLAVE>;
+        reset-names = "phy",
+                      "dbi",
+                      "mstr",
+                      "slv";
+        spacemit,apmu = <&syscon_apmu>;
+        #phy-cells = <1>;
+    };