[PATCH v3 09/23] dt-bindings: clock: Add RPMI clock service controller bindings

Anup Patel
2025-05-11T13:41:21Z

Add device tree bindings for the RPMI clock service group based
controller for the supervisor software.

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

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
---
.../bindings/clock/riscv,rpmi-clock.yaml | 61 +++++++++++++++++++
1 file changed, 61 insertions(+)
create mode 100644 Documentation/devicetree/bindings/clock/riscv,rpmi-clock.yaml

diff --git a/Documentation/devicetree/bindings/clock/riscv,rpmi-clock.yaml b/Documentation/devicetree/bindings/clock/riscv,rpmi-clock.yaml
new file mode 100644
index 000000000000..9c672a38595a
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/riscv,rpmi-clock.yaml
@@ -0,0 +1,61 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/riscv,rpmi-clock.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: RISC-V RPMI clock service group based clock 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 clock service group for accessing
+ system clocks managed by a platform microcontroller. The supervisor
+ software can access RPMI clock 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
+
+properties:
+ compatible:
+ description:
+ Intended for use by the supervisor software.
+ const: riscv,rpmi-clock
+
+ mboxes:
+ maxItems: 1
+ description:
+ Mailbox channel of the underlying RPMI transport or SBI message proxy channel.
+
+ "#clock-cells":
+ const: 1
+
+required:
+ - compatible
+ - mboxes
+ - "#clock-cells"
+
+additionalProperties: false
+
+examples:
+ - |
+ clock-controller {
+ compatible = "riscv,rpmi-clock";
+ mboxes = <&mpxy_mbox 0x1000 0x0>;
+ #clock-cells = <1>;
+ };
+...
--
2.43.0