dt-bindings: power: reset: qcom: Add resin binding

Resin is similar to pwrkey, add the description and example
for resin bindings
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>

Documentation/devicetree/bindings/input/qcom,pm8941-pwrkey.txt

@@ -7,6 +7,7 @@ PROPERTIES
 	Value type: <string>
 	Definition: must be one of:
 		    "qcom,pm8941-pwrkey"
+		    "qcom,pm8941-resin"
 
 - reg:
 	Usage: required

Documentation/devicetree/bindings/power/reset/qcom,pon.txt

 Qualcomm PON Device
 
 The Power On device for Qualcomm PM8xxx is MFD supporting pwrkey
-along with the Android reboot-mode.
+and resin along with the Android reboot-mode.
 
-This DT node has pwrkey as sub node.
+This DT node has pwrkey and resin as sub nodes.
 
 Required Properties:
 -compatible: "qcom,pm8916-pon"
@@ -12,6 +12,8 @@ Required Properties:
 Optional subnode:
 -pwrkey: Specifies the subnode pwrkey and should follow the
  qcom,pm8941-pwrkey.txt description.
+-resin: Specifies the subnode resin and should follow the
+ qcom,pm8xxx-pwrkey.txt description.
 
 The rest of the properties should follow the generic reboot-mode description
 found in reboot-mode.txt
@@ -32,4 +34,12 @@ Example:
 			bias-pull-up;
 			linux,code = <KEY_POWER>;
 		};
+
+		resin {
+			compatible = "qcom,pm8941-resin";
+			interrupts = <0x0 0x8 1 IRQ_TYPE_EDGE_BOTH>;
+			debounce = <15625>;
+			bias-pull-up;
+			linux,code = <KEY_VOLUMEDOWN>;
+		};
 	};