The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)

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FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/firmware/qcom,scm.txt

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    1 QCOM Secure Channel Manager (SCM)
    2 
    3 Qualcomm processors include an interface to communicate to the secure firmware.
    4 This interface allows for clients to request different types of actions.  These
    5 can include CPU power up/down, HDCP requests, loading of firmware, and other
    6 assorted actions.
    7 
    8 Required properties:
    9 - compatible: must contain one of the following:
   10  * "qcom,scm-apq8064"
   11  * "qcom,scm-apq8084"
   12  * "qcom,scm-ipq4019"
   13  * "qcom,scm-ipq806x"
   14  * "qcom,scm-ipq8074"
   15  * "qcom,scm-mdm9607"
   16  * "qcom,scm-msm8226"
   17  * "qcom,scm-msm8660"
   18  * "qcom,scm-msm8916"
   19  * "qcom,scm-msm8953"
   20  * "qcom,scm-msm8960"
   21  * "qcom,scm-msm8974"
   22  * "qcom,scm-msm8976"
   23  * "qcom,scm-msm8994"
   24  * "qcom,scm-msm8996"
   25  * "qcom,scm-msm8998"
   26  * "qcom,scm-qcs404"
   27  * "qcom,scm-sc7180"
   28  * "qcom,scm-sc7280"
   29  * "qcom,scm-sm6125"
   30  * "qcom,scm-sdm845"
   31  * "qcom,scm-sdx55"
   32  * "qcom,scm-sdx65"
   33  * "qcom,scm-sm6350"
   34  * "qcom,scm-sm8150"
   35  * "qcom,scm-sm8250"
   36  * "qcom,scm-sm8350"
   37  * "qcom,scm-sm8450"
   38  and:
   39  * "qcom,scm"
   40 - clocks: Specifies clocks needed by the SCM interface, if any:
   41  * core clock required for "qcom,scm-apq8064", "qcom,scm-msm8660" and
   42    "qcom,scm-msm8960"
   43  * core, iface and bus clocks required for "qcom,scm-apq8084",
   44    "qcom,scm-msm8916", "qcom,scm-msm8953", "qcom,scm-msm8974" and "qcom,scm-msm8976"
   45 - clock-names: Must contain "core" for the core clock, "iface" for the interface
   46   clock and "bus" for the bus clock per the requirements of the compatible.
   47 - qcom,dload-mode: phandle to the TCSR hardware block and offset of the
   48                    download mode control register (optional)
   49 - interconnects: Specifies the bandwidth requirements of the SCM interface (optional)
   50 
   51 Example for MSM8916:
   52 
   53         firmware {
   54                 scm {
   55                         compatible = "qcom,msm8916", "qcom,scm";
   56                         clocks = <&gcc GCC_CRYPTO_CLK> ,
   57                                  <&gcc GCC_CRYPTO_AXI_CLK>,
   58                                  <&gcc GCC_CRYPTO_AHB_CLK>;
   59                         clock-names = "core", "bus", "iface";
   60                 };
   61         };

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