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Wysocki" , Mika Westerberg , Andy Shevchenko , Linus Walleij , Bartosz Golaszewski , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= Cc: Palmer Dabbelt , Paul Walmsley , Len Brown , Sunil V L , Rahul Pathak , Leyfoon Tan , Atish Patra , Andrew Jones , Samuel Holland , Anup Patel , linux-clk@vger.kernel.org, devicetree@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, Anup Patel Subject: [RFC PATCH v2 03/17] dt-bindings: mailbox: Add bindings for RISC-V SBI MPXY extension Date: Mon, 3 Feb 2025 14:18:52 +0530 Message-ID: <20250203084906.681418-4-apatel@ventanamicro.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250203084906.681418-1-apatel@ventanamicro.com> References: <20250203084906.681418-1-apatel@ventanamicro.com> Precedence: bulk X-Mailing-List: linux-clk@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Add device tree bindings for the RISC-V SBI Message Proxy (MPXY) extension as a mailbox controller. Signed-off-by: Anup Patel --- .../bindings/mailbox/riscv,sbi-mpxy-mbox.yaml | 54 +++++++++++++++++++ 1 file changed, 54 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..8a05e089b710 --- /dev/null +++ b/Documentation/devicetree/bindings/mailbox/riscv,sbi-mpxy-mbox.yaml @@ -0,0 +1,54 @@ +# 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 + +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) + https://github.com/riscv-non-isa/riscv-sbi-doc/releases + + [2] RISC-V Platform Management Interface (RPMI) + https://github.com/riscv-non-isa/riscv-rpmi/releases + +properties: + $nodename: + const: sbi-mpxy-mbox + + 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: + - | + sbi-mpxy-mbox { + compatible = "riscv,sbi-mpxy-mbox"; + #mbox-cells = <2>; + };