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# 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>
allOf:
- $ref: /schemas/cpus.yaml#
properties:
$nodename:
const: cpus
description: Container of cpu nodes
'#address-cells':
const: 1
description: |
A single unsigned 32-bit integer uniquely identifies each RISC-V
hart in a system. (See the "reg" node under the "cpu" node,
below).
'#size-cells':
const: 0
patternProperties:
'^cpu@[0-9a-f]+$':
properties:
compatible:
type: array
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 {
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";
};
};
};
...
|
