[PATCH v6 1/2] dt-bindings: thermal: imx: Document calibration offset property

[Haoning CHENG via B4 Relay]

From: Haoning CHENG <Haoning.CHENG at cn.bosch.com>

Some boards need a small per-design correction to align the reported CPU
temperature with board-level measurements.

Document the optional fsl,temp-calibration-offset-millicelsius property,
a signed offset in millicelsius that is added to the calculated sensor
temperature. The property is optional and the existing behaviour is kept
when it is omitted.

Update the binding example to show its usage.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski at oss.qualcomm.com>
Signed-off-by: Haoning CHENG <Haoning.CHENG at cn.bosch.com>
---
 Documentation/devicetree/bindings/thermal/imx-thermal.yaml | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Documentation/devicetree/bindings/thermal/imx-thermal.yaml b/Documentation/devicetree/bindings/thermal/imx-thermal.yaml
index 949b154856c5..b9afffd98f84 100644
--- a/Documentation/devicetree/bindings/thermal/imx-thermal.yaml
+++ b/Documentation/devicetree/bindings/thermal/imx-thermal.yaml
@@ -59,6 +59,14 @@ properties:
   clocks:
     maxItems: 1
 
+  fsl,temp-calibration-offset-millicelsius:
+    minimum: -28580
+    maximum: 28580
+    description:
+      A signed calibration offset, in millicelsius, added to the calculated
+      sensor temperature to compensate for board-level measurement
+      differences. When absent, no offset is applied.
+
   "#thermal-sensor-cells":
     const: 0
 
@@ -109,6 +117,7 @@ examples:
             nvmem-cells = <&tempmon_calib>, <&tempmon_temp_grade>;
             nvmem-cell-names = "calib", "temp_grade";
             clocks = <&clks IMX6SX_CLK_PLL3_USB_OTG>;
+            fsl,temp-calibration-offset-millicelsius = <(-6400)>;
             #thermal-sensor-cells = <0>;
         };
     };

-- 
2.43.0