Documentation/devicetree/bindings/iommu/qcom,tbu.yaml

Source file repositories/reference/linux-study-clean/Documentation/devicetree/bindings/iommu/qcom,tbu.yaml

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Linux kernel
Corpus path
Documentation/devicetree/bindings/iommu/qcom,tbu.yaml
Extension
.yaml
Size
1855 bytes
Lines
70
Domain
Support Tooling And Documentation
Bucket
Documentation
Inferred role
Support Tooling And Documentation: configuration, schema, or hardware description
Status
atlas-only

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Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

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

title: Qualcomm TBU (Translation Buffer Unit)

maintainers:
  - Georgi Djakov <quic_c_gdjako@quicinc.com>

description:
  The Qualcomm SMMU500 implementation consists of TCU and TBU. The TBU contains
  a Translation Lookaside Buffer (TLB) that caches page tables. TBUs provides
  debug features to trace and trigger debug transactions. There are multiple TBU
  instances with each client core.

properties:
  compatible:
    enum:
      - qcom,sc7280-tbu
      - qcom,sdm845-tbu

  reg:
    maxItems: 1

  clocks:
    maxItems: 1

  interconnects:
    maxItems: 1

  power-domains:
    maxItems: 1

  qcom,stream-id-range:
    description: |
      Phandle of a SMMU device and Stream ID range (address and size) that
      is assigned by the TBU
    $ref: /schemas/types.yaml#/definitions/phandle-array
    items:
      - items:
          - description: phandle of a smmu node
          - description: stream id base address
          - description: stream id size

required:
  - compatible
  - reg
  - qcom,stream-id-range

additionalProperties: false

examples:
  - |
    #include <dt-bindings/clock/qcom,gcc-sdm845.h>
    #include <dt-bindings/interconnect/qcom,icc.h>
    #include <dt-bindings/interconnect/qcom,sdm845.h>

    tbu@150e1000 {
        compatible = "qcom,sdm845-tbu";
        reg = <0x150e1000 0x1000>;
        clocks = <&gcc GCC_AGGRE_NOC_PCIE_TBU_CLK>;
        interconnects = <&system_noc MASTER_GNOC_SNOC QCOM_ICC_TAG_ACTIVE_ONLY
                         &config_noc SLAVE_IMEM_CFG QCOM_ICC_TAG_ACTIVE_ONLY>;
        power-domains = <&gcc HLOS1_VOTE_AGGRE_NOC_MMU_PCIE_TBU_GDSC>;
        qcom,stream-id-range = <&apps_smmu 0x1c00 0x400>;
    };
...

Annotation

Implementation Notes