xref: /openbmc/linux/Documentation/devicetree/bindings/interconnect/qcom,msm8998-bwmon.yaml (revision 3098fcb1)

# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
%YAML 1.2
---
$id: http://devicetree.org/schemas/interconnect/qcom,msm8998-bwmon.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Qualcomm Interconnect Bandwidth Monitor

maintainers:
  - Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

description: |
  Bandwidth Monitor measures current throughput on buses between various NoC
  fabrics and provides information when it crosses configured thresholds.

  Certain SoCs might have more than one Bandwidth Monitors, for example on SDM845::
   - Measuring the bandwidth between CPUs and Last Level Cache Controller -
     called just BWMON,
   - Measuring the bandwidth between Last Level Cache Controller and memory
     (DDR) - called LLCC BWMON.

properties:
  compatible:
    oneOf:
      - items:
          - enum:
              - qcom,sdm845-bwmon
          - const: qcom,msm8998-bwmon
      - const: qcom,msm8998-bwmon       # BWMON v4
      - const: qcom,sdm845-llcc-bwmon   # BWMON v5

  interconnects:
    maxItems: 1

  interrupts:
    maxItems: 1

  operating-points-v2: true
  opp-table: true

  reg:
    # BWMON v4 (currently described) and BWMON v5 use one register address
    # space.  BWMON v2 uses two register spaces - not yet described.
    maxItems: 1

required:
  - compatible
  - interconnects
  - interrupts
  - operating-points-v2
  - opp-table
  - reg

additionalProperties: false

examples:
  - |
    #include <dt-bindings/interconnect/qcom,sdm845.h>
    #include <dt-bindings/interrupt-controller/arm-gic.h>

    pmu@1436400 {
        compatible = "qcom,sdm845-bwmon", "qcom,msm8998-bwmon";
        reg = <0x01436400 0x600>;
        interrupts = <GIC_SPI 581 IRQ_TYPE_LEVEL_HIGH>;
        interconnects = <&gladiator_noc MASTER_APPSS_PROC 3 &mem_noc SLAVE_LLCC 3>;

        operating-points-v2 = <&cpu_bwmon_opp_table>;

        cpu_bwmon_opp_table: opp-table {
            compatible = "operating-points-v2";
            opp-0 {
                opp-peak-kBps = <4800000>;
            };
            opp-1 {
                opp-peak-kBps = <9216000>;
            };
            opp-2 {
                opp-peak-kBps = <15052800>;
            };
            opp-3 {
                opp-peak-kBps = <20889600>;
            };
            opp-4 {
                opp-peak-kBps = <25497600>;
            };
        };
    };