[PATCH v2] dt-bindings: thermal: correct thermal zone node name limit
From: Krzysztof Kozlowski
Date: Tue Jul 02 2024 - 10:53:05 EST
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 (thus 10 for the pattern after leading fixed character).
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>
---
Changes in v2:
1. Shorten the pattern and mention source of size requirement (Rob).
---
Documentation/devicetree/bindings/thermal/thermal-zones.yaml | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/thermal/thermal-zones.yaml b/Documentation/devicetree/bindings/thermal/thermal-zones.yaml
index 68398e7e8655..606b80965a44 100644
--- a/Documentation/devicetree/bindings/thermal/thermal-zones.yaml
+++ b/Documentation/devicetree/bindings/thermal/thermal-zones.yaml
@@ -49,7 +49,10 @@ properties:
to take when the temperature crosses those thresholds.
patternProperties:
- "^[a-zA-Z][a-zA-Z0-9\\-]{1,12}-thermal$":
+ # Node name is limited in size due to Linux kernel requirements - 19
+ # characters in total (see THERMAL_NAME_LENGTH, including terminating NUL
+ # byte):
+ "^[a-zA-Z][a-zA-Z0-9\\-]{1,10}-thermal$":
type: object
description:
Each thermal zone node contains information about how frequently it
--
2.43.0