linux-kernel - [PATCH 1/4] dt-bindings: Document new common property: has-inaccessible-regs

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Message-ID: <20251129142042.344359-2-richard@nod.at>
Date: Sat, 29 Nov 2025 15:20:39 +0100
From: Richard Weinberger <richard@....at>
To: linux-kernel@...r.kernel.org
Cc: linux-omap@...r.kernel.org,
	devicetree@...r.kernel.org,
	arnd@...db.de,
	lee@...nel.org,
	dakr@...nel.org,
	rafael@...nel.org,
	gregkh@...uxfoundation.org,
	broonie@...nel.org,
	tony@...mide.com,
	rogerq@...nel.org,
	khilman@...libre.com,
	andreas@...nade.info,
	aaro.koskinen@....fi,
	conor+dt@...nel.org,
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	robh@...nel.org,
	Richard Weinberger <richard@....at>
Subject: [PATCH 1/4] dt-bindings: Document new common property: has-inaccessible-regs

This property is used to denote that a certain register map contains
registers that are inaccessible under conditions only a device driver
can know.
The purpose of this property is to disable register access through debug
facilities outside of the device driver.

Signed-off-by: Richard Weinberger <richard@....at>
---
 .../devicetree/bindings/common-properties.txt        | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/Documentation/devicetree/bindings/common-properties.txt b/Documentation/devicetree/bindings/common-properties.txt
index 98a28130e100f..edf6d0b8cf1b1 100644
--- a/Documentation/devicetree/bindings/common-properties.txt
+++ b/Documentation/devicetree/bindings/common-properties.txt
@@ -83,3 +83,15 @@ gpio@0 {
 	      #gpio-cells = <2>;
 	      #daisy-chained-devices = <3>;
 };
+
+Inaccessible registers
+----------------------
+
+If a register map as described by the 'reg' property contains registers
+that cannot be accessed for various reasons and splitting the register
+definition is not possible, use this property to denote that uncontrolled
+access outside of a device driver should be disabled.
+On Linux, for example, this disables regmap debugfs access
+
+Optional properties:
+- has-inaccessible-regs: Boolean
-- 
2.51.0