linux-kernel - [PATCH 1/2] dt-bindings: mfd: syscon: introduce no-auto-mmio property for syscons

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Message-ID: <230cf12861a4f0b9effc72522444d3e28c1de2c9.1761753288.git.dan.carpenter@linaro.org>
Date: Wed, 29 Oct 2025 20:27:05 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Lee Jones <lee@...nel.org>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] dt-bindings: mfd: syscon: introduce no-auto-mmio
 property for syscons

Generally, syscons are created automatically and accessed direclty via
MMIO however sometimes syscons might only be accessible from the secure
partition or through SCMI etc.  Introduce the no-auto-mmio property to
tell the operating system that the syscon needs to be handled manually.

Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
 Documentation/devicetree/bindings/mfd/syscon.yaml | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/mfd/syscon.yaml b/Documentation/devicetree/bindings/mfd/syscon.yaml
index 657c38175fba..a0ad12ae0bee 100644
--- a/Documentation/devicetree/bindings/mfd/syscon.yaml
+++ b/Documentation/devicetree/bindings/mfd/syscon.yaml
@@ -245,6 +245,10 @@ properties:
   resets:
     maxItems: 1
 
+  no-auto-mmio:
+    type: boolean
+    description: Prevents the syscon from being created automatically
+
 required:
   - compatible
   - reg
-- 
2.51.0