dt-bindings: phy: qcom,qmp-pcie: add sc8280xp bindings

Add bindings for the PCIe QMP PHYs found on SC8280XP.

The PCIe2 and PCIe3 controllers and PHYs on SC8280XP can be used in
4-lane mode or as separate controllers and PHYs in 2-lane mode (e.g. as
PCIe2A and PCIe2B).

The configuration for a specific system can be read from a TCSR register.
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Link: https://lore.kernel.org/r/20221105145939.20318-12-johan+linaro@kernel.orgSigned-off-by: Vinod Koul <vkoul@kernel.org>

Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-pcie-phy.yaml

+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/phy/qcom,sc8280xp-qmp-pcie-phy.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm QMP PHY controller (PCIe, SC8280XP)
+
+maintainers:
+  - Vinod Koul <vkoul@kernel.org>
+
+description:
+  The QMP PHY controller supports physical layer functionality for a number of
+  controllers on Qualcomm chipsets, such as, PCIe, UFS, and USB.
+
+properties:
+  compatible:
+    enum:
+      - qcom,sc8280xp-qmp-gen3x1-pcie-phy
+      - qcom,sc8280xp-qmp-gen3x2-pcie-phy
+      - qcom,sc8280xp-qmp-gen3x4-pcie-phy
+
+  reg:
+    minItems: 1
+    maxItems: 2
+
+  clocks:
+    maxItems: 6
+
+  clock-names:
+    items:
+      - const: aux
+      - const: cfg_ahb
+      - const: ref
+      - const: rchng
+      - const: pipe
+      - const: pipediv2
+
+  power-domains:
+    maxItems: 1
+
+  resets:
+    maxItems: 1
+
+  reset-names:
+    items:
+      - const: phy
+
+  vdda-phy-supply: true
+
+  vdda-pll-supply: true
+
+  qcom,4ln-config-sel:
+    description: PCIe 4-lane configuration
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    items:
+      - items:
+          - description: phandle of TCSR syscon
+          - description: offset of PCIe 4-lane configuration register
+          - description: offset of configuration bit for this PHY
+
+  "#clock-cells":
+    const: 0
+
+  clock-output-names:
+    maxItems: 1
+
+  "#phy-cells":
+    const: 0
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - power-domains
+  - resets
+  - reset-names
+  - vdda-phy-supply
+  - vdda-pll-supply
+  - "#clock-cells"
+  - clock-output-names
+  - "#phy-cells"
+
+additionalProperties: false
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - qcom,sc8280xp-qmp-gen3x4-pcie-phy
+    then:
+      properties:
+        reg:
+          items:
+            - description: port a
+            - description: port b
+      required:
+        - qcom,4ln-config-sel
+    else:
+      properties:
+        reg:
+          maxItems: 1
+
+examples:
+  - |
+    #include <dt-bindings/clock/qcom,gcc-sc8280xp.h>
+
+    pcie2b_phy: phy@1c18000 {
+      compatible = "qcom,sc8280xp-qmp-gen3x2-pcie-phy";
+      reg = <0x01c18000 0x2000>;
+
+      clocks = <&gcc GCC_PCIE_2B_AUX_CLK>,
+               <&gcc GCC_PCIE_2B_CFG_AHB_CLK>,
+               <&gcc GCC_PCIE_2A2B_CLKREF_CLK>,
+               <&gcc GCC_PCIE2B_PHY_RCHNG_CLK>,
+               <&gcc GCC_PCIE_2B_PIPE_CLK>,
+               <&gcc GCC_PCIE_2B_PIPEDIV2_CLK>;
+      clock-names = "aux", "cfg_ahb", "ref", "rchng",
+                    "pipe", "pipediv2";
+
+      power-domains = <&gcc PCIE_2B_GDSC>;
+
+      resets = <&gcc GCC_PCIE_2B_PHY_BCR>;
+      reset-names = "phy";
+
+      vdda-phy-supply = <&vreg_l6d>;
+      vdda-pll-supply = <&vreg_l4d>;
+
+      #clock-cells = <0>;
+      clock-output-names = "pcie_2b_pipe_clk";
+
+      #phy-cells = <0>;
+    };
+
+    pcie2a_phy: phy@1c24000 {
+      compatible = "qcom,sc8280xp-qmp-gen3x4-pcie-phy";
+      reg = <0x01c24000 0x2000>, <0x01c26000 0x2000>;
+
+      clocks = <&gcc GCC_PCIE_2A_AUX_CLK>,
+               <&gcc GCC_PCIE_2A_CFG_AHB_CLK>,
+               <&gcc GCC_PCIE_2A2B_CLKREF_CLK>,
+               <&gcc GCC_PCIE2A_PHY_RCHNG_CLK>,
+               <&gcc GCC_PCIE_2A_PIPE_CLK>,
+               <&gcc GCC_PCIE_2A_PIPEDIV2_CLK>;
+      clock-names = "aux", "cfg_ahb", "ref", "rchng",
+                    "pipe", "pipediv2";
+
+      power-domains = <&gcc PCIE_2A_GDSC>;
+
+      resets = <&gcc GCC_PCIE_2A_PHY_BCR>;
+      reset-names = "phy";
+
+      vdda-phy-supply = <&vreg_l6d>;
+      vdda-pll-supply = <&vreg_l4d>;
+
+      qcom,4ln-config-sel = <&tcsr 0xa044 0>;
+
+      #clock-cells = <0>;
+      clock-output-names = "pcie_2a_pipe_clk";
+
+      #phy-cells = <0>;
+    };