Re: [PATCH v2] docs: dt: writing-bindings: Extend compatible fallbacks guideline

[Rob Herring (Arm)]

On Mon, 27 Apr 2026 18:07:40 +0200, Krzysztof Kozlowski wrote:
> Extend the guidelines when to use fallback compatibles to cover to
> common review responses.  Devices are most likely compatible and should
> use fallbacks when having:
> 
> 1. Compatible programming interface, meaning one is a subset, and Linux
>    device drivers can use the subset to correctly match/bind and still
>    operate with the subset features.
> 
> 2. Device variant discovery through some means, like registers.
> 
> Devices are incompatible and fallback is not suitable when that
> fallback cannot be used by the drivers to match/bind.  In the same time
> commit message should clearly explain when the code suggests devices
> are compatible, but the binding does not define them as such.
> 
> Acked-by: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxxxxxxxx>
> 
> ---
> 
> Changes in v2:
> 1. Include Conor's suggestion about commit msg, a bit rephrased.
> 2. Add tag
> 3. Drop double-space, because file does not use that format (old habit).
> ---
>  .../devicetree/bindings/writing-bindings.rst         | 12 +++++++++++-
>  1 file changed, 11 insertions(+), 1 deletion(-)
> 

Applied, thanks!