linux_dsm_epyc7002/Documentation/devicetree/bindings/riscv/cpus.yaml

# SPDX-License-Identifier: (GPL-2.0 OR MIT)
%YAML 1.2
---
$id: http://devicetree.org/schemas/riscv/cpus.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: RISC-V bindings for 'cpus' DT nodes

maintainers:
  - Paul Walmsley <paul.walmsley@sifive.com>
  - Palmer Dabbelt <palmer@sifive.com>

properties:
  compatible:
    items:
      - enum:
          - sifive,rocket0
          - sifive,e5
          - sifive,e51
          - sifive,u54-mc
          - sifive,u54
          - sifive,u5
      - const: riscv
    description:
      Identifies that the hart uses the RISC-V instruction set
      and identifies the type of the hart.

  mmu-type:
    allOf:
      - $ref: "/schemas/types.yaml#/definitions/string"
      - enum:
          - riscv,sv32
          - riscv,sv39
          - riscv,sv48
    description:
      Identifies the MMU address translation mode used on this
      hart.  These values originate from the RISC-V Privileged
      Specification document, available from
      https://riscv.org/specifications/

  riscv,isa:
    allOf:
      - $ref: "/schemas/types.yaml#/definitions/string"
      - enum:
          - rv64imac
          - rv64imafdc
    description:
      Identifies the specific RISC-V instruction set architecture
      supported by the hart.  These are documented in the RISC-V
      User-Level ISA document, available from
      https://riscv.org/specifications/

  timebase-frequency:
    type: integer
    minimum: 1
    description:
      Specifies the clock frequency of the system timer in Hz.
      This value is common to all harts on a single system image.

  interrupt-controller:
    type: object
    description: Describes the CPU's local interrupt controller

    properties:
      '#interrupt-cells':
        const: 1

      compatible:
        const: riscv,cpu-intc

      interrupt-controller: true

    required:
      - '#interrupt-cells'
      - compatible
      - interrupt-controller

required:
  - riscv,isa
  - timebase-frequency
  - interrupt-controller

examples:
  - |
    // Example 1: SiFive Freedom U540G Development Kit
    cpus {
        #address-cells = <1>;
        #size-cells = <0>;
        timebase-frequency = <1000000>;
        cpu@0 {
                clock-frequency = <0>;
                compatible = "sifive,rocket0", "riscv";
                device_type = "cpu";
                i-cache-block-size = <64>;
                i-cache-sets = <128>;
                i-cache-size = <16384>;
                reg = <0>;
                riscv,isa = "rv64imac";
                cpu_intc0: interrupt-controller {
                        #interrupt-cells = <1>;
                        compatible = "riscv,cpu-intc";
                        interrupt-controller;
                };
        };
        cpu@1 {
                clock-frequency = <0>;
                compatible = "sifive,rocket0", "riscv";
                d-cache-block-size = <64>;
                d-cache-sets = <64>;
                d-cache-size = <32768>;
                d-tlb-sets = <1>;
                d-tlb-size = <32>;
                device_type = "cpu";
                i-cache-block-size = <64>;
                i-cache-sets = <64>;
                i-cache-size = <32768>;
                i-tlb-sets = <1>;
                i-tlb-size = <32>;
                mmu-type = "riscv,sv39";
                reg = <1>;
                riscv,isa = "rv64imafdc";
                tlb-split;
                cpu_intc1: interrupt-controller {
                        #interrupt-cells = <1>;
                        compatible = "riscv,cpu-intc";
                        interrupt-controller;
                };
        };
    };

  - |
    // Example 2: Spike ISA Simulator with 1 Hart
    cpus {
        #address-cells = <1>;
        #size-cells = <0>;
        cpu@0 {
                device_type = "cpu";
                reg = <0>;
                compatible = "riscv";
                riscv,isa = "rv64imafdc";
                mmu-type = "riscv,sv48";
                interrupt-controller {
                        #interrupt-cells = <1>;
                        interrupt-controller;
                        compatible = "riscv,cpu-intc";
                };
        };
    };
...