[PATCH] dt-bindings: thermal: Drop thermal zone node name length limit

[PATCH] dt-bindings: thermal: Drop thermal zone node name length limit

[Daniel Lezcano]

Device Tree bindings describe hardware and must remain OS-agnostic.
The thermal zone node name length limit is derived from Linux's
THERMAL_NAME_LENGTH macro, which is an implementation detail rather
than a hardware requirement.

Remove the length restriction and its accompanying comment while
preserving the thermal zone naming convention. Any OS-specific limits
should be handled by the implementation rather than encoded in the
Device Tree ABI.

Signed-off-by: Daniel Lezcano <daniel.lezcano@oss.qualcomm.com>
Cc: Manaf Meethalavalappu Pallikunhi <manaf.pallikunhi@oss.qualcomm.com>
---
 Documentation/devicetree/bindings/thermal/thermal-zones.yaml | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/Documentation/devicetree/bindings/thermal/thermal-zones.yaml b/Documentation/devicetree/bindings/thermal/thermal-zones.yaml
index 999ad40a20d5..6091e886829d 100644
--- a/Documentation/devicetree/bindings/thermal/thermal-zones.yaml
+++ b/Documentation/devicetree/bindings/thermal/thermal-zones.yaml
@@ -49,10 +49,7 @@ properties:
       to take when the temperature crosses those thresholds.
 
 patternProperties:
-  # Node name is limited in size due to Linux kernel requirements - 19
-  # characters in total (see THERMAL_NAME_LENGTH, including terminating NUL
-  # byte):
-  "^[a-zA-Z][a-zA-Z0-9\\-]{1,10}-thermal$":
+  "^[a-zA-Z][a-zA-Z0-9\\-]*-thermal$":
     type: object
     description:
       Each thermal zone node contains information about how frequently it
-- 
2.43.0

Re: [PATCH] dt-bindings: thermal: Drop thermal zone node name length limit

[Krzysztof Kozlowski]

On Mon, Oct 26, 2026 at 10:49:56AM +0100, Daniel Lezcano wrote:
> Device Tree bindings describe hardware and must remain OS-agnostic.

DTS describes hardware. Bindings describe the ABI between hardware and
software, so if SW requires something regarding the DTS, should be
placed in the binding as well, IMO.

Best regards,
Krzysztof

Re: [PATCH] dt-bindings: thermal: Drop thermal zone node name length limit

[Daniel Lezcano]

On 10/28/26 14:00, Krzysztof Kozlowski wrote:
> On Mon, Oct 26, 2026 at 10:49:56AM +0100, Daniel Lezcano wrote:
>> Device Tree bindings describe hardware and must remain OS-agnostic.
> 
> DTS describes hardware. Bindings describe the ABI between hardware and
> software, so if SW requires something regarding the DTS, should be
> placed in the binding as well, IMO.
That's odd, if the Linux kernel changes the thermal zone name length to 
something else, then that impacts the bindings, no ?

I don't see a good reason why the node name must be limited by Linux.

Re: [PATCH] dt-bindings: thermal: Drop thermal zone node name length limit

[Krzysztof Kozlowski]

On 28/10/2026 17:07, Daniel Lezcano wrote:
> On 10/28/26 14:00, Krzysztof Kozlowski wrote:
>> On Mon, Oct 26, 2026 at 10:49:56AM +0100, Daniel Lezcano wrote:
>>> Device Tree bindings describe hardware and must remain OS-agnostic.
>>
>> DTS describes hardware. Bindings describe the ABI between hardware and
>> software, so if SW requires something regarding the DTS, should be
>> placed in the binding as well, IMO.
> That's odd, if the Linux kernel changes the thermal zone name length to 
> something else, then that impacts the bindings, no ?
> 
> I don't see a good reason why the node name must be limited by Linux.

I provided the reason. Why aren't we/you removing all the device subnode
namings coming from of_get_child_by_name() usage? That's purely a Linux
requirement, no?

Best regards,
Krzysztof