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dt-bindings: mailbox: Add bindings for RISC-V SBI MPXY extension
Add device tree bindings for the RISC-V SBI Message Proxy (MPXY)
extension as a mailbox controller.
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Acked-by: Jassi Brar <jassisinghbrar@gmail.com>
Link: https://lore.kernel.org/r/20250818040920.272664-3-apatel@ventanamicro.com
Signed-off-by: Paul Walmsley <pjw@kernel.org>
authored by
Anup Patel
and committed by
Paul Walmsley
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Documentation/devicetree/bindings/mailbox/riscv,sbi-mpxy-mbox.yaml
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Documentation/devicetree/bindings/mailbox/riscv,sbi-mpxy-mbox.yaml
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# 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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$id: http://devicetree.org/schemas/mailbox/riscv,sbi-mpxy-mbox.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: RISC-V SBI Message Proxy (MPXY) extension based mailbox
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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 SBI Message Proxy (MPXY) extension [1] allows supervisor
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software to send messages through the SBI implementation (M-mode
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firmware or HS-mode hypervisor). The underlying message protocol
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and message format used by the supervisor software could be some
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other standard protocol compatible with the SBI MPXY extension
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(such as RISC-V Platform Management Interface (RPMI) [2]).
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===========================================
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References
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===========================================
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[1] 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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[2] 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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properties:
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compatible:
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const: riscv,sbi-mpxy-mbox
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"#mbox-cells":
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const: 2
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description:
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The first cell specifies channel_id of the SBI MPXY channel,
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the second cell specifies MSG_PROT_ID of the SBI MPXY channel
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required:
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- compatible
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- "#mbox-cells"
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additionalProperties: false
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examples:
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- |
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mailbox {
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compatible = "riscv,sbi-mpxy-mbox";
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#mbox-cells = <2>;
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};