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54e184f0f5
Add device tree bindings for the RPMI clock service group based message proxy implemented by the SBI implementation (machine mode firmware or hypervisor). The RPMI clock service group is defined by the RISC-V platform management interface (RPMI) specification. Reviewed-by: Conor Dooley <conor.dooley@microchip.com> Signed-off-by: Anup Patel <apatel@ventanamicro.com> Acked-by: Stephen Boyd <sboyd@kernel.org> Link: https://lore.kernel.org/r/20250818040920.272664-9-apatel@ventanamicro.com Signed-off-by: Paul Walmsley <pjw@kernel.org>
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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