[PATCH v3 12/23] dt-bindings: Add RPMI system MSI interrupt controller bindings

Anup Patel
2025-05-11T13:41:47Z

Add device tree bindings for the RPMI system MSI service group
based interrupt controller for the supervisor software.

The RPMI system MSI service group is defined by the RISC-V
platform management interface (RPMI) specification.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
---
.../riscv,rpmi-system-msi.yaml | 74 +++++++++++++++++++
1 file changed, 74 insertions(+)
create mode 100644 Documentation/devicetree/bindings/interrupt-controller/riscv,rpmi-system-msi.yaml

diff --git a/Documentation/devicetree/bindings/interrupt-controller/riscv,rpmi-system-msi.yaml b/Documentation/devicetree/bindings/interrupt-controller/riscv,rpmi-system-msi.yaml
new file mode 100644
index 000000000000..ac13cec0666e
--- /dev/null
+++ b/Documentation/devicetree/bindings/interrupt-controller/riscv,rpmi-system-msi.yaml
@@ -0,0 +1,74 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/interrupt-controller/riscv,rpmi-system-msi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: RISC-V RPMI system MSI service group based interrupt controller
+
+maintainers:
+ - Anup Patel <anup@brainfault.org>
+
+description: |
+ The RISC-V Platform Management Interface (RPMI) [1] defines a
+ messaging protocol which is modular and extensible. The supervisor
+ software can send/receive RPMI messages via SBI MPXY extension [2]
+ or some dedicated supervisor-mode RPMI transport.
+
+ The RPMI specification [1] defines system MSI service group which
+ allow application processors to receive MSIs upon system events
+ such as P2A doorbell, graceful shutdown/reboot request, CPU hotplug
+ event, memory hotplug event, etc from the platform microcontroller.
+ The supervisor software can access RPMI system MSI service group via
+ SBI MPXY channel or some dedicated supervisor-mode RPMI transport.
+
+ ===========================================
+ References
+ ===========================================
+
+ [1] RISC-V Platform Management Interface (RPMI)
+ https://github.com/riscv-non-isa/riscv-rpmi/releases
+
+ [2] RISC-V Supervisor Binary Interface (SBI)
+ https://github.com/riscv-non-isa/riscv-sbi-doc/releases
+
+allOf:
+ - $ref: /schemas/interrupt-controller.yaml#
+
+properties:
+ compatible:
+ description:
+ Intended for use by the supervisor software.
+ const: riscv,rpmi-system-msi
+
+ mboxes:
+ maxItems: 1
+ description:
+ Mailbox channel of the underlying RPMI transport or SBI message proxy channel.
+
+ msi-parent: true
+
+ interrupt-controller: true
+
+ "#interrupt-cells":
+ const: 1
+
+required:
+ - compatible
+ - mboxes
+ - msi-parent
+ - interrupt-controller
+ - "#interrupt-cells"
+
+additionalProperties: false
+
+examples:
+ - |
+ interrupt-controller {
+ compatible = "riscv,rpmi-system-msi";
+ mboxes = <&mpxy_mbox 0x2000 0x0>;
+ msi-parent = <&imsic_slevel>;
+ interrupt-controller;
+ #interrupt-cells = <1>;
+ };
+...
--
2.43.0