linux-kernel - Re: [PATCH v3] dt-bindings: incomplete-devices: document devices without bindings

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Message-ID: <20240803103334.3f74ce52@jic23-huawei>
Date: Sat, 3 Aug 2024 10:33:34 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.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, Marek Vasut <marex@...x.de>, Sebastian
 Reichel <sebastian.reichel@...labora.com>
Subject: Re: [PATCH v3] dt-bindings: incomplete-devices: document devices
 without bindings

On Fri, 12 Jul 2024 14:11:46 +0200
Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> wrote:

> There are devices in the wild with non-updatable firmware coming with
> ACPI tables with rejected compatibles, e.g. "ltr,ltrf216a".  Linux
> kernel still supports this device via ACPI PRP0001, however the
> compatible was never accepted to bindings.
> 
> There are also several early PowerPC or SPARC platforms using
> compatibles for their OpenFirmware, but without in-tree DTS.  Often the
> legacy compatible is not correct in terms of current Devicetree
> specification, e.g. missing vendor prefix.
> 
> Finally there are also Linux-specific tools and test code with
> compatibles.
> 
> Add a schema covering above cases purely to satisfy the DT schema and
> scripts/checkpatch.pl checks for undocumented compatibles.  For
> ltr,ltrf216a this also documents the consensus: compatible is allowed
> only via ACPI PRP0001, but not bindings.
> 
> Link: https://lore.kernel.org/all/20240705095047.90558-1-marex@denx.de/
> Link: https://lore.kernel.org/lkml/20220731173446.7400bfa8@jic23-huawei/T/#me55be502302d70424a85368c2645c89f860b7b40
> Cc: Marek Vasut <marex@...x.de>
> Cc: Jonathan Cameron <jic23@...nel.org>
> Cc: Sebastian Reichel <sebastian.reichel@...labora.com>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

Nice solution. Thanks Krzysztof.