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

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Message-ID: <7d9fcf24-5ad5-48cf-b36d-83025976f3aa@kernel.org>
Date: Sat, 29 Nov 2025 16:23:21 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Richard Weinberger <richard@....at>, 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, krzk+dt@...nel.org,
 robh@...nel.org
Subject: Re: [PATCH 1/4] dt-bindings: Document new common property:
 has-inaccessible-regs

On 29/11/2025 15:20, Richard Weinberger wrote:
> This property is used to denote that a certain register map contains
> registers that are inaccessible under conditions only a device driver
> can know.

So device driver controls fully their exposure via sysfs.

Binding cannot help here at all.

> The purpose of this property is to disable register access through debug
> facilities outside of the device driver.

You described OS policy which is not suitable for bindings at all. Plus
commit msg really mixes up two separate points - buggy driver which
fails to properly set regmap (or other facility) with some DT-based
restrictions.



Best regards,
Krzysztof