linux-kernel - [PATCH v4 2/3] dt-bindings: power: Add SiFive Domain Management controllers

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Message-Id: <20260108-sifive-pd-drivers-v4-2-2a523d7d51a0@sifive.com>
Date: Thu, 08 Jan 2026 00:58:25 -0800
From: Nick Hu <nick.hu@...ive.com>
To: "Rafael J. Wysocki" <rafael@...nel.org>, 
 Daniel Lezcano <daniel.lezcano@...aro.org>, Paul Walmsley <pjw@...nel.org>, 
 Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
 Alexandre Ghiti <alex@...ti.fr>, Anup Patel <anup@...infault.org>, 
 Samuel Holland <samuel.holland@...ive.com>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Cyan Yang <cyan.yang@...ive.com>, 
 Nick Hu <nick.hu@...ive.com>
Cc: linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org, 
 linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org
Subject: [PATCH v4 2/3] dt-bindings: power: Add SiFive Domain Management
 controllers

SiFive Domain Management controller includes the following components
- SiFive Tile Management Controller
- SiFive Cluster Management Controller
- SiFive Core Complex Management Controller

These controllers control the clock and power domain of the
corresponding domain.

Add `- {}` for the first entry [1][2]. Once the SoCs are ready, we will
add the SoC compatible string at that time.

Links:
- [1] https://lore.kernel.org/lkml/20250311195953.GA14239-robh@kernel.org/
- [2] https://lore.kernel.org/lkml/CAKddAkAzDGL-7MbroRqQnZzPXOquUMKNuGGppqB-d_XZXbcvBA@mail.gmail.com/T/#t

Reviewed-by: Samuel Holland <samuel.holland@...ive.com>
Reviewed-by: Rob Herring (Arm) <robh@...nel.org>
Signed-off-by: Nick Hu <nick.hu@...ive.com>
---
 .../devicetree/bindings/power/sifive,tmc.yaml      | 58 ++++++++++++++++++++++
 1 file changed, 58 insertions(+)

diff --git a/Documentation/devicetree/bindings/power/sifive,tmc.yaml b/Documentation/devicetree/bindings/power/sifive,tmc.yaml
new file mode 100644
index 000000000000..4ab2b94785f4
--- /dev/null
+++ b/Documentation/devicetree/bindings/power/sifive,tmc.yaml
@@ -0,0 +1,58 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/power/sifive,tmc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: SiFive Domain Management Controller
+
+maintainers:
+  - Cyan Yang <cyan.yang@...ive.com>
+  - Nick Hu <nick.hu@...ive.com>
+  - Samuel Holland <samuel.holland@...ive.com>
+
+description: |
+  SiFive Domain Management Controllers includes the following components
+    - Tile Management Controller (TMC)
+    - Cluster Management Controller (CMC)
+    - Subsystem Management Controller (SMC)
+  These controllers manage both the clock and power domains of the
+  associated components. They support the SiFive Quiet Interface Protocol
+  (SQIP) starting from Version 1. The control method differs from Version
+  0, making them incompatible.
+
+allOf:
+  - $ref: power-domain.yaml#
+
+properties:
+  compatible:
+    oneOf:
+      - items:
+          - {} # Leave a empty for future SoC specific compatible string
+          - const: sifive,cmc2
+      - items:
+          - {} # Leave a empty for future SoC specific compatible string
+          - const: sifive,smc0
+      - items:
+          - {} # Leave a empty for future SoC specific compatible string
+          - const: sifive,smc1
+      - items:
+          - {} # Leave a empty for future SoC specific compatible string
+          - const: sifive,tmc0
+      - items:
+          - {} # Leave a empty for future SoC specific compatible string
+          - const: sifive,tmc1
+
+  reg:
+    maxItems: 1
+
+  "#power-domain-cells":
+    const: 0
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+# The example will be added once the SoCs are ready

-- 
2.43.7