dt-bindings: mfd: mediatek: mt6397: add mt6323 PMIC EFUSE

The MediaTek mt6323 PMIC includes an EFUSE used for storing calibration
data.

Add the devicetree binding documentation for the MediaTek mt6323 EFUSE.

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Roman Vivchar <rva333@protonmail.com>
Signed-off-by: Srinivas Kandagatla <srini@kernel.org>
Link: https://patch.msgid.link/20261002101352.1084447-7-srini@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/mfd/mediatek,mt6397.yaml

@@ -159,6 +159,23 @@ properties:
     required:
       - compatible
 
+  efuse:
+    type: object
+    unevaluatedProperties: false
+    description:
+      The efuse is responsible for storing calibration data, such as thermal
+      sensor calibration.
+
+    properties:
+      compatible:
+        const: mediatek,mt6323-efuse
+
+      nvmem-layout:
+        $ref: /schemas/nvmem/layouts/nvmem-layout.yaml#
+
+    required:
+      - compatible
+
   leds:
     type: object
     additionalProperties: false
@@ -307,6 +324,10 @@ examples:
         interrupt-controller;
         #interrupt-cells = <2>;
 
+        efuse {
+          compatible = "mediatek,mt6323-efuse";
+        };
+
         leds {
             compatible = "mediatek,mt6323-led";
             #address-cells = <1>;