65 lines
1.9 KiB
YAML
65 lines
1.9 KiB
YAML
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/clock/riscv,rpmi-mpxy-clock.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: RISC-V RPMI clock service group based message proxy
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maintainers:
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- Anup Patel <anup@brainfault.org>
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description: |
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The RISC-V Platform Management Interface (RPMI) [1] defines a
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messaging protocol which is modular and extensible. The supervisor
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software can send/receive RPMI messages via SBI MPXY extension [2]
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or some dedicated supervisor-mode RPMI transport.
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The RPMI specification [1] defines clock service group for accessing
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system clocks managed by a platform microcontroller. The SBI implementation
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(machine mode firmware or hypervisor) can implement an SBI MPXY channel
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to allow RPMI clock service group access to the supervisor software.
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===========================================
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References
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===========================================
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[1] RISC-V Platform Management Interface (RPMI) v1.0 (or higher)
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https://github.com/riscv-non-isa/riscv-rpmi/releases
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[2] RISC-V Supervisor Binary Interface (SBI) v3.0 (or higher)
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https://github.com/riscv-non-isa/riscv-sbi-doc/releases
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properties:
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compatible:
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description:
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Intended for use by the SBI implementation.
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const: riscv,rpmi-mpxy-clock
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mboxes:
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maxItems: 1
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description:
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Mailbox channel of the underlying RPMI transport.
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riscv,sbi-mpxy-channel-id:
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$ref: /schemas/types.yaml#/definitions/uint32
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description:
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The SBI MPXY channel id to be used for providing RPMI access to
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the supervisor software.
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required:
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- compatible
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- mboxes
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- riscv,sbi-mpxy-channel-id
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additionalProperties: false
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examples:
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- |
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clock-service {
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compatible = "riscv,rpmi-mpxy-clock";
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mboxes = <&rpmi_shmem_mbox 0x8>;
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riscv,sbi-mpxy-channel-id = <0x1000>;
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};
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...
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