tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
7title: RISC-V RPMI clock service group based clock controller
8
9maintainers:
10 - Anup Patel <anup@brainfault.org>
11
12description: |
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
33properties:
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
50required:
51 - compatible
52 - mboxes
53 - "#clock-cells"
54
55additionalProperties: false
56
57examples:
58 - |
59 clock-controller {
60 compatible = "riscv,rpmi-clock";
61 mboxes = <&mpxy_mbox 0x1000 0x0>;
62 #clock-cells = <1>;
63 };
64...