Re: [PATCH 1/2] dt-bindings: thermal: correct thermal zone node name limit

[Rob Herring]

On Wed, Jan 3, 2024 at 7:20 AM Krzysztof Kozlowski
<krzysztof.kozlowski@xxxxxxxxxx> wrote:
>
> Linux kernel uses thermal zone node name during registering thermal
> zones and has a hard-coded limit of 20 characters, including terminating
> NUL byte.  The bindings expect node names to finish with '-thermal'
> which is eight bytes long, thus we have only 11 characters for the reset
> of the node name, not 12.
>
> Reported-by: Rob Herring <robh@xxxxxxxxxx>
> Closes: https://lore.kernel.org/all/CAL_JsqKogbT_4DPd1n94xqeHaU_J8ve5K09WOyVsRX3jxxUW3w@xxxxxxxxxxxxxx/
> Fixes: 1202a442a31f ("dt-bindings: thermal: Add yaml bindings for thermal zones")
> Cc: <stable@xxxxxxxxxxxxxxx>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>
> ---
>  Documentation/devicetree/bindings/thermal/thermal-zones.yaml | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/Documentation/devicetree/bindings/thermal/thermal-zones.yaml b/Documentation/devicetree/bindings/thermal/thermal-zones.yaml
> index 4a8dabc48170..bbc883fd4044 100644
> --- a/Documentation/devicetree/bindings/thermal/thermal-zones.yaml
> +++ b/Documentation/devicetree/bindings/thermal/thermal-zones.yaml
> @@ -49,7 +49,7 @@ properties:
>        to take when the temperature crosses those thresholds.
>
>  patternProperties:
> -  "^[a-zA-Z][a-zA-Z0-9\\-]{1,12}-thermal$":
> +  "^[a-zA-Z][a-zA-Z0-9\\-]{1,11}-thermal$":

Now off by 1 instead of 2. It should be 1 starting char, 1-10 chars,
and 8 chars for "-thermal".

Can you also add a comment that this length is due to the kernel.

Rob