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dt-bindings: clock: Add RPMI clock service controller bindings

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.

Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Acked-by: Jassi Brar <jassisinghbrar@gmail.com>
Link: https://lore.kernel.org/r/20250818040920.272664-10-apatel@ventanamicro.com
Signed-off-by: Paul Walmsley <pjw@kernel.org>

authored by

Anup Patel and committed by
Paul Walmsley b3858302 54e184f0

+64
+64
Documentation/devicetree/bindings/clock/riscv,rpmi-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-clock.yaml# 5 + $schema: http://devicetree.org/meta-schemas/core.yaml# 6 + 7 + title: RISC-V RPMI clock service group based clock controller 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 supervisor 20 + software can access RPMI clock service group via SBI MPXY channel or 21 + some dedicated supervisor-mode RPMI transport. 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 supervisor software. 37 + const: riscv,rpmi-clock 38 + 39 + mboxes: 40 + maxItems: 1 41 + description: 42 + Mailbox channel of the underlying RPMI transport or SBI message proxy channel. 43 + 44 + "#clock-cells": 45 + const: 1 46 + description: 47 + Platform specific CLOCK_ID as defined by the RISC-V Platform Management 48 + Interface (RPMI) specification. 49 + 50 + required: 51 + - compatible 52 + - mboxes 53 + - "#clock-cells" 54 + 55 + additionalProperties: false 56 + 57 + examples: 58 + - | 59 + clock-controller { 60 + compatible = "riscv,rpmi-clock"; 61 + mboxes = <&mpxy_mbox 0x1000 0x0>; 62 + #clock-cells = <1>; 63 + }; 64 + ...