[PATCH v10 02/24] dt-bindings: mailbox: Add bindings for RISC-V SBI MPXY extension
From: Anup Patel <hidden>
Date: 2025-08-18 04:10:22
Also in:
linux-acpi, linux-clk, linux-riscv, lkml
Subsystem:
mailbox api, open firmware and flattened device tree bindings, risc-v rpmi and mpxy drivers, the rest · Maintainers:
Jassi Brar, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Rahul Pathak, Anup Patel, Linus Torvalds
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 <redacted> --- .../bindings/mailbox/riscv,sbi-mpxy-mbox.yaml | 51 +++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 Documentation/devicetree/bindings/mailbox/riscv,sbi-mpxy-mbox.yaml
diff --git a/Documentation/devicetree/bindings/mailbox/riscv,sbi-mpxy-mbox.yaml b/Documentation/devicetree/bindings/mailbox/riscv,sbi-mpxy-mbox.yaml
new file mode 100644
index 000000000000..061437a0b45a
--- /dev/null
+++ b/Documentation/devicetree/bindings/mailbox/riscv,sbi-mpxy-mbox.yaml@@ -0,0 +1,51 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/mailbox/riscv,sbi-mpxy-mbox.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: RISC-V SBI Message Proxy (MPXY) extension based mailbox + +maintainers: + - Anup Patel <anup@brainfault.org> + +description: | + The RISC-V SBI Message Proxy (MPXY) extension [1] allows supervisor + software to send messages through the SBI implementation (M-mode + firmware or HS-mode hypervisor). The underlying message protocol + and message format used by the supervisor software could be some + other standard protocol compatible with the SBI MPXY extension + (such as RISC-V Platform Management Interface (RPMI) [2]). + + =========================================== + References + =========================================== + + [1] RISC-V Supervisor Binary Interface (SBI) v3.0 (or higher) + https://github.com/riscv-non-isa/riscv-sbi-doc/releases + + [2] RISC-V Platform Management Interface (RPMI) v1.0 (or higher) + https://github.com/riscv-non-isa/riscv-rpmi/releases + +properties: + compatible: + const: riscv,sbi-mpxy-mbox + + "#mbox-cells": + const: 2 + description: + The first cell specifies channel_id of the SBI MPXY channel, + the second cell specifies MSG_PROT_ID of the SBI MPXY channel + +required: + - compatible + - "#mbox-cells" + +additionalProperties: false + +examples: + - | + mailbox { + compatible = "riscv,sbi-mpxy-mbox"; + #mbox-cells = <2>; + };
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2.43.0