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Message-Id: <20240223-b4-bus-v2-1-da8ba83c1a5f@outlook.com>
Date: Fri, 23 Feb 2024 18:10:19 +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 v2 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.
Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
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
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