linux-kernel - [PATCH 1/2] dt-bindings: simple-pm-bus: Add optional resets

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Message-Id: <20240223-b4-bus-v1-1-2803c3ac4673@outlook.com>
Date: Fri, 23 Feb 2024 11:49:46 +0800
From: Yang Xiwen via B4 Relay <devnull+forbidden405.outlook.com@...nel.org>
To: Rob Herring <robh+dt@...nel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Geert Uytterhoeven <geert+renesas@...der.be>, 
 Philipp Zabel <p.zabel@...gutronix.de>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Yang Xiwen <forbidden405@...look.com>
Subject: [PATCH 1/2] dt-bindings: simple-pm-bus: Add optional resets

From: Yang Xiwen <forbidden405@...look.com>

For some on-soc buses, it is also needed to deassert the resets before
access. Document it in the binding.

Signed-off-by: Yang Xiwen <forbidden405@...look.com>
---
 Documentation/devicetree/bindings/bus/simple-pm-bus.yaml | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/bus/simple-pm-bus.yaml b/Documentation/devicetree/bindings/bus/simple-pm-bus.yaml
index 182134d7a6a3..430638104980 100644
--- a/Documentation/devicetree/bindings/bus/simple-pm-bus.yaml
+++ b/Documentation/devicetree/bindings/bus/simple-pm-bus.yaml
@@ -14,8 +14,9 @@ description: |
   driver, as it's typically initialized by the boot loader.
 
   However, its bus controller is part of a PM domain, or under the control
-  of a functional clock.  Hence, the bus controller's PM domain and/or
-  clock must be enabled for child devices connected to the bus (either
+  of a functional clock, and it might have a reset control signal.  Hence,
+  the bus controller's PM domain and/or clock must be enabled, reset control
+  signal must be deasserted for child devices connected to the bus (either
   on-SoC or externally) to function.
 
   While "simple-pm-bus" follows the "simple-bus" set of properties, as
@@ -49,6 +50,8 @@ properties:
     # Required if clocks is absent, optional otherwise
     minItems: 1
 
+  resets: true
+
 required:
   - compatible
   - '#address-cells'

-- 
2.43.0