linux/Documentation/devicetree/bindings/firmware/qcom,scm.yaml

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/firmware/qcom,scm.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: QCOM Secure Channel Manager (SCM)

description: |
  Qualcomm processors include an interface to communicate to the secure firmware.
  This interface allows for clients to request different types of actions.
  These can include CPU power up/down, HDCP requests, loading of firmware,
  and other assorted actions.  

maintainers:
  - Bjorn Andersson <bjorn.andersson@linaro.org>
  - Robert Marko <robimarko@gmail.com>
  - Guru Das Srinagesh <quic_gurus@quicinc.com>

properties:
  compatible:
    items:
      - enum:
          - qcom,scm-apq8064
          - qcom,scm-apq8084
          - qcom,scm-ipq4019
          - qcom,scm-ipq5018
          - qcom,scm-ipq5332
          - qcom,scm-ipq6018
          - qcom,scm-ipq806x
          - qcom,scm-ipq8074
          - qcom,scm-ipq9574
          - qcom,scm-mdm9607
          - qcom,scm-msm8226
          - qcom,scm-msm8660
          - qcom,scm-msm8916
          - qcom,scm-msm8953
          - qcom,scm-msm8960
          - qcom,scm-msm8974
          - qcom,scm-msm8976
          - qcom,scm-msm8994
          - qcom,scm-msm8996
          - qcom,scm-msm8998
          - qcom,scm-qcm2290
          - qcom,scm-qdu1000
          - qcom,scm-sa8775p
          - qcom,scm-sc7180
          - qcom,scm-sc7280
          - qcom,scm-sc8180x
          - qcom,scm-sc8280xp
          - qcom,scm-sdm670
          - qcom,scm-sdm845
          - qcom,scm-sdx55
          - qcom,scm-sdx65
          - qcom,scm-sdx75
          - qcom,scm-sm6115
          - qcom,scm-sm6125
          - qcom,scm-sm6350
          - qcom,scm-sm6375
          - qcom,scm-sm7150
          - qcom,scm-sm8150
          - qcom,scm-sm8250
          - qcom,scm-sm8350
          - qcom,scm-sm8450
          - qcom,scm-sm8550
          - qcom,scm-sm8650
          - qcom,scm-qcs404
          - qcom,scm-x1e80100
      - const: qcom,scm

  clocks:
    minItems: 1
    maxItems: 3

  clock-names:
    minItems: 1
    maxItems: 3

  dma-coherent: true

  interconnects:
    maxItems: 1

  interconnect-names:
    maxItems: 1

  '#reset-cells':
    const: 1

  interrupts:
    description:
      The wait-queue interrupt that firmware raises as part of handshake
      protocol to handle sleeping SCM calls.
    maxItems: 1

  memory-region:
    description:
      Phandle to the memory region reserved for the shared memory bridge to TZ.
    maxItems: 1

  qcom,sdi-enabled:
    description:
      Indicates that the SDI (Secure Debug Image) has been enabled by TZ
      by default and it needs to be disabled.
      If not disabled WDT assertion or reboot will cause the board to hang
      in the debug mode.
    type: boolean

  qcom,dload-mode:
    $ref: /schemas/types.yaml#/definitions/phandle-array
    items:
      - items:
          - description: phandle to TCSR hardware block
          - description: offset of the download mode control register
    description: TCSR hardware block

allOf:
  # Clocks
  - if:
      properties:
        compatible:
          contains:
            enum:
              - qcom,scm-apq8064
              - qcom,scm-apq8084
              - qcom,scm-mdm9607
              - qcom,scm-msm8226
              - qcom,scm-msm8660
              - qcom,scm-msm8916
              - qcom,scm-msm8953
              - qcom,scm-msm8960
              - qcom,scm-msm8974
              - qcom,scm-msm8976
              - qcom,scm-qcm2290
              - qcom,scm-sm6375
    then:
      required:
        - clocks
        - clock-names
    else:
      properties:
        clock-names: false
        clocks: false

  - if:
      properties:
        compatible:
          contains:
            enum:
              - qcom,scm-apq8064
              - qcom,scm-msm8660
              - qcom,scm-msm8960
              - qcom,scm-qcm2290
              - qcom,scm-sm6375
    then:
      properties:
        clock-names:
          items:
            - const: core

        clocks:
          maxItems: 1

  - if:
      properties:
        compatible:
          contains:
            enum:
              - qcom,scm-apq8084
              - qcom,scm-mdm9607
              - qcom,scm-msm8226
              - qcom,scm-msm8916
              - qcom,scm-msm8953
              - qcom,scm-msm8974
              - qcom,scm-msm8976
    then:
      properties:
        clock-names:
          items:
            - const: core
            - const: bus
            - const: iface

        clocks:
          minItems: 3
          maxItems: 3

  # Interrupts
  - if:
      not:
        properties:
          compatible:
            contains:
              enum:
                - qcom,scm-sm8450
                - qcom,scm-sm8550
                - qcom,scm-sm8650
    then:
      properties:
        interrupts: false
  - if:
      not:
        properties:
          compatible:
            contains:
              enum:
                - qcom,scm-sa8775p
    then:
      properties:
        memory-region: false

required:
  - compatible

additionalProperties: false

examples:
  - |
    #include <dt-bindings/clock/qcom,gcc-msm8916.h>

    firmware {
        scm {
            compatible = "qcom,scm-msm8916", "qcom,scm";
            clocks = <&gcc GCC_CRYPTO_CLK>,
                     <&gcc GCC_CRYPTO_AXI_CLK>,
                     <&gcc GCC_CRYPTO_AHB_CLK>;
            clock-names = "core", "bus", "iface";
        };
    };