FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/soc/qcom/qcom,aoss-qmp.txt

     Qualcomm Always-On Subsystem side channel binding
     
     This binding describes the hardware component responsible for side channel
     requests to the always-on subsystem (AOSS), used for certain power management
     requests that is not handled by the standard RPMh interface. Each client in the
     SoC has it's own block of message RAM and IRQ for communication with the AOSS.
     The protocol used to communicate in the message RAM is known as Qualcomm
     Messaging Protocol (QMP)
     
    The AOSS side channel exposes control over a set of resources, used to control
    a set of debug related clocks and to affect the low power state of resources
    related to the secondary subsystems. These resources are exposed as a set of
    power-domains.
    
    - compatible:
            Usage: required
            Value type: <string>
            Definition: must be one of:
                        "qcom,sc7180-aoss-qmp"
                        "qcom,sc7280-aoss-qmp"
                        "qcom,sdm845-aoss-qmp"
                        "qcom,sm8150-aoss-qmp"
                        "qcom,sm8250-aoss-qmp"
                        "qcom,sm8350-aoss-qmp"
    
    - reg:
            Usage: required
            Value type: <prop-encoded-array>
            Definition: the base address and size of the message RAM for this
                        client's communication with the AOSS
    
    - interrupts:
            Usage: required
            Value type: <prop-encoded-array>
            Definition: should specify the AOSS message IRQ for this client
    
    - mboxes:
            Usage: required
            Value type: <prop-encoded-array>
            Definition: reference to the mailbox representing the outgoing doorbell
                        in APCS for this client, as described in mailbox/mailbox.txt
    
    - #clock-cells:
            Usage: optional
            Value type: <u32>
            Definition: must be 0
                        The single clock represents the QDSS clock.
    
    - #power-domain-cells:
            Usage: optional
            Value type: <u32>
            Definition: must be 1
                        The provided power-domains are:
                        CDSP state (0), LPASS state (1), modem state (2), SLPI
                        state (3), SPSS state (4) and Venus state (5).
    
    = SUBNODES
    The AOSS side channel also provides the controls for three cooling devices,
    these are expressed as subnodes of the QMP node. The name of the node is used
    to identify the resource and must therefor be "cx", "mx" or "ebi".
    
    - #cooling-cells:
            Usage: optional
            Value type: <u32>
            Definition: must be 2
    
    = EXAMPLE
    
    The following example represents the AOSS side-channel message RAM and the
    mechanism exposing the power-domains, as found in SDM845.
    
      aoss_qmp: qmp@c300000 {
              compatible = "qcom,sdm845-aoss-qmp";
              reg = <0x0c300000 0x100000>;
              interrupts = <GIC_SPI 389 IRQ_TYPE_EDGE_RISING>;
              mboxes = <&apss_shared 0>;
    
              #power-domain-cells = <1>;
    
              cx_cdev: cx {
                    #cooling-cells = <2>;
              };
    
              mx_cdev: mx {
                    #cooling-cells = <2>;
              };
      };

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