xref: /linux/Documentation/devicetree/bindings/interconnect/qcom,bcm-voter.yaml (revision f83d9396d1f63048c423efa00e4e244da10a35fd) 
1# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/interconnect/qcom,bcm-voter.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: Qualcomm BCM-Voter Interconnect
8
9maintainers:
10  - Georgi Djakov <georgi.djakov@linaro.org>
11
12description: |
13  The Bus Clock Manager (BCM) is a dedicated hardware accelerator that manages
14  shared system resources by aggregating requests from multiple Resource State
15  Coordinators (RSC). Interconnect providers are able to vote for aggregated
16  thresholds values from consumers by communicating through their respective
17  RSCs.
18
19properties:
20  compatible:
21    enum:
22      - qcom,bcm-voter
23
24  qcom,tcs-wait:
25    description: |
26      Optional mask of which TCSs (Triggered Command Sets) wait for completion
27      upon triggering. If not specified, then the AMC and WAKE sets wait for
28      completion. The mask bits are available in the QCOM_ICC_TAG_* defines.
29
30      The AMC TCS is triggered immediately when icc_set_bw() is called. The
31      WAKE/SLEEP TCSs are triggered when the RSC transitions between active and
32      sleep modes.
33
34      In most cases, it's necessary to wait in both the AMC and WAKE sets to
35      ensure resources are available before use. If a specific RSC and its use
36      cases can ensure sufficient delay by other means, then this can be
37      overridden to reduce latencies.
38
39    $ref: /schemas/types.yaml#/definitions/uint32
40
41required:
42  - compatible
43
44additionalProperties: false
45
46examples:
47  # Example 1: apps bcm_voter on SDM845 SoC should be defined inside &apps_rsc node
48  # as defined in Documentation/devicetree/bindings/soc/qcom/qcom,rpmh-rsc.yaml
49  - |
50
51    apps_bcm_voter: bcm-voter {
52        compatible = "qcom,bcm-voter";
53    };
54
55  # Example 2: disp bcm_voter on SDM845 should be defined inside &disp_rsc node
56  # as defined in Documentation/devicetree/bindings/soc/qcom/qcom,rpmh-rsc.yaml
57  - |
58
59    #include <dt-bindings/interconnect/qcom,icc.h>
60
61    disp_bcm_voter: bcm-voter {
62        compatible = "qcom,bcm-voter";
63        qcom,tcs-wait = <QCOM_ICC_TAG_AMC>;
64    };
65...
66