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a4fe515903
The power-domains exposed by AOSS QMP node are used to notify the Always on Subsystem (AOSS) that a particular co-processor is up/down. These co-processors enter low-power modes independent to that of the application processor and their states are expected to remain unaltered across system suspend/resume cycles. To achieve this behavior let's drop the load power-domain and replace them with generic qmp_send interface instead. Signed-off-by: Sibi Sankar <sibis@codeaurora.org> Reviewed-by: Matthias Kaehlcke <mka@chromium.org> Reviewed-by: Stephen Boyd <swboyd@chromium.org> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org> Link: https://lore.kernel.org/r/1631800770-371-2-git-send-email-sibis@codeaurora.org
107 lines
2.8 KiB
YAML
107 lines
2.8 KiB
YAML
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/soc/qcom/qcom,aoss-qmp.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Qualcomm Always-On Subsystem side channel binding
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maintainers:
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- Bjorn Andersson <bjorn.andersson@linaro.org>
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description:
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This binding describes the hardware component responsible for side channel
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requests to the always-on subsystem (AOSS), used for certain power management
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requests that is not handled by the standard RPMh interface. Each client in the
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SoC has it's own block of message RAM and IRQ for communication with the AOSS.
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The protocol used to communicate in the message RAM is known as Qualcomm
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Messaging Protocol (QMP)
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The AOSS side channel exposes control over a set of resources, used to control
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a set of debug related clocks and to affect the low power state of resources
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related to the secondary subsystems.
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properties:
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compatible:
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items:
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- enum:
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- qcom,sc7180-aoss-qmp
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- qcom,sc7280-aoss-qmp
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- qcom,sc8180x-aoss-qmp
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- qcom,sdm845-aoss-qmp
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- qcom,sm6350-aoss-qmp
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- qcom,sm8150-aoss-qmp
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- qcom,sm8250-aoss-qmp
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- qcom,sm8350-aoss-qmp
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- const: qcom,aoss-qmp
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reg:
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maxItems: 1
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description:
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The base address and size of the message RAM for this client's
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communication with the AOSS
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interrupts:
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maxItems: 1
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description:
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Should specify the AOSS message IRQ for this client
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mboxes:
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maxItems: 1
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description:
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Reference to the mailbox representing the outgoing doorbell in APCS for
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this client, as described in mailbox/mailbox.txt
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"#clock-cells":
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const: 0
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description:
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The single clock represents the QDSS clock.
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required:
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- compatible
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- reg
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- interrupts
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- mboxes
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- "#clock-cells"
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additionalProperties: false
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patternProperties:
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"^(cx|mx|ebi)$":
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type: object
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description:
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The AOSS side channel also provides the controls for three cooling devices,
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these are expressed as subnodes of the QMP node. The name of the node is
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used to identify the resource and must therefor be "cx", "mx" or "ebi".
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properties:
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"#cooling-cells":
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const: 2
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required:
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- "#cooling-cells"
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additionalProperties: false
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examples:
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- |
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#include <dt-bindings/interrupt-controller/arm-gic.h>
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aoss_qmp: qmp@c300000 {
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compatible = "qcom,sdm845-aoss-qmp", "qcom,aoss-qmp";
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reg = <0x0c300000 0x100000>;
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interrupts = <GIC_SPI 389 IRQ_TYPE_EDGE_RISING>;
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mboxes = <&apss_shared 0>;
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#clock-cells = <0>;
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cx_cdev: cx {
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#cooling-cells = <2>;
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};
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mx_cdev: mx {
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#cooling-cells = <2>;
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};
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};
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...
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