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dt-bindings: clock: Add RPMI clock service message proxy bindings

Add device tree bindings for the RPMI clock service group based
message proxy implemented by the SBI implementation (machine mode
firmware or hypervisor).

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

Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Acked-by: Stephen Boyd <sboyd@kernel.org>
Link: https://lore.kernel.org/r/20250818040920.272664-9-apatel@ventanamicro.com
Signed-off-by: Paul Walmsley <pjw@kernel.org>

authored by

Anup Patel and committed by
Paul Walmsley 54e184f0 bf3022a4

+64
+64
Documentation/devicetree/bindings/clock/riscv,rpmi-mpxy-clock.yaml
··· 1 + # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) 2 + %YAML 1.2 3 + --- 4 + $id: http://devicetree.org/schemas/clock/riscv,rpmi-mpxy-clock.yaml# 5 + $schema: http://devicetree.org/meta-schemas/core.yaml# 6 + 7 + title: RISC-V RPMI clock service group based message proxy 8 + 9 + maintainers: 10 + - Anup Patel <anup@brainfault.org> 11 + 12 + description: | 13 + The RISC-V Platform Management Interface (RPMI) [1] defines a 14 + messaging protocol which is modular and extensible. The supervisor 15 + software can send/receive RPMI messages via SBI MPXY extension [2] 16 + or some dedicated supervisor-mode RPMI transport. 17 + 18 + The RPMI specification [1] defines clock service group for accessing 19 + system clocks managed by a platform microcontroller. The SBI implementation 20 + (machine mode firmware or hypervisor) can implement an SBI MPXY channel 21 + to allow RPMI clock service group access to the supervisor software. 22 + 23 + =========================================== 24 + References 25 + =========================================== 26 + 27 + [1] RISC-V Platform Management Interface (RPMI) v1.0 (or higher) 28 + https://github.com/riscv-non-isa/riscv-rpmi/releases 29 + 30 + [2] RISC-V Supervisor Binary Interface (SBI) v3.0 (or higher) 31 + https://github.com/riscv-non-isa/riscv-sbi-doc/releases 32 + 33 + properties: 34 + compatible: 35 + description: 36 + Intended for use by the SBI implementation. 37 + const: riscv,rpmi-mpxy-clock 38 + 39 + mboxes: 40 + maxItems: 1 41 + description: 42 + Mailbox channel of the underlying RPMI transport. 43 + 44 + riscv,sbi-mpxy-channel-id: 45 + $ref: /schemas/types.yaml#/definitions/uint32 46 + description: 47 + The SBI MPXY channel id to be used for providing RPMI access to 48 + the supervisor software. 49 + 50 + required: 51 + - compatible 52 + - mboxes 53 + - riscv,sbi-mpxy-channel-id 54 + 55 + additionalProperties: false 56 + 57 + examples: 58 + - | 59 + clock-service { 60 + compatible = "riscv,rpmi-mpxy-clock"; 61 + mboxes = <&rpmi_shmem_mbox 0x8>; 62 + riscv,sbi-mpxy-channel-id = <0x1000>; 63 + }; 64 + ...