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