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-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>;
- };
- };