66 lines
2.1 KiB
YAML
66 lines
2.1 KiB
YAML
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# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/interconnect/qcom,bcm-voter.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Qualcomm BCM-Voter Interconnect
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maintainers:
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- Georgi Djakov <georgi.djakov@linaro.org>
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description: |
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The Bus Clock Manager (BCM) is a dedicated hardware accelerator that manages
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shared system resources by aggregating requests from multiple Resource State
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Coordinators (RSC). Interconnect providers are able to vote for aggregated
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thresholds values from consumers by communicating through their respective
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RSCs.
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properties:
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compatible:
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enum:
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- qcom,bcm-voter
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qcom,tcs-wait:
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description: |
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Optional mask of which TCSs (Triggered Command Sets) wait for completion
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upon triggering. If not specified, then the AMC and WAKE sets wait for
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completion. The mask bits are available in the QCOM_ICC_TAG_* defines.
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The AMC TCS is triggered immediately when icc_set_bw() is called. The
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WAKE/SLEEP TCSs are triggered when the RSC transitions between active and
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sleep modes.
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In most cases, it's necessary to wait in both the AMC and WAKE sets to
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ensure resources are available before use. If a specific RSC and its use
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cases can ensure sufficient delay by other means, then this can be
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overridden to reduce latencies.
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$ref: /schemas/types.yaml#/definitions/uint32
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required:
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- compatible
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additionalProperties: false
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examples:
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# Example 1: apps bcm_voter on SDM845 SoC should be defined inside &apps_rsc node
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# as defined in Documentation/devicetree/bindings/soc/qcom/qcom,rpmh-rsc.yaml
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- |
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apps_bcm_voter: bcm-voter {
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compatible = "qcom,bcm-voter";
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};
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# Example 2: disp bcm_voter on SDM845 should be defined inside &disp_rsc node
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# as defined in Documentation/devicetree/bindings/soc/qcom/qcom,rpmh-rsc.yaml
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- |
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#include <dt-bindings/interconnect/qcom,icc.h>
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disp_bcm_voter: bcm-voter {
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compatible = "qcom,bcm-voter";
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qcom,tcs-wait = <QCOM_ICC_TAG_AMC>;
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};
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...
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