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

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Message-ID: <172080781462.1404657.13880263626115458163.robh@kernel.org>
Date: Fri, 12 Jul 2024 12:39:22 -0600
From: "Rob Herring (Arm)" <robh@...nel.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: Marek Vasut <marex@...x.de>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
	linux-kernel@...r.kernel.org, Conor Dooley <conor+dt@...nel.org>,
	Sebastian Reichel <sebastian.reichel@...labora.com>,
	devicetree@...r.kernel.org, Jonathan Cameron <jic23@...nel.org>
Subject: Re: [PATCH v3] dt-bindings: incomplete-devices: document devices
 without bindings


On Fri, 12 Jul 2024 14:11:46 +0200, Krzysztof Kozlowski 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>
> 
> ---
> 
> Changes in v3:
> 1. Incorrect->Legacy
> 2. Drop ohci-littledian
> 3. Drop unittest
> 
> Changes in v2:
> 1. Rename to incomplete-devices.yaml
> 2. Add many compatibles based on Rob's feedback, rewrite descriptions in
>    the schema.
> ---
>  .../bindings/incomplete-devices.yaml          | 137 ++++++++++++++++++
>  1 file changed, 137 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/incomplete-devices.yaml
> 

Applied, thanks!