dt-bindings: iio: sx9324: Add precharge resistor setting

Allow configure the resistance used during precharge.
Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220429220144.1476049-4-gwendal@chromium.orgSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/devicetree/bindings/iio/proximity/semtech,sx9324.yaml

@@ -126,6 +126,14 @@ properties:
       UINT_MAX (4294967295) represents infinite. Other values
       represent 1-1/N.
 
+  semtech,input-precharge-resistor-ohms:
+    default: 4000
+    multipleOf: 2000
+    minimum: 0
+    maximum: 30000
+    description:
+      Pre-charge input resistance in Ohm.
+
 required:
   - compatible
   - reg
@@ -157,5 +165,6 @@ examples:
         semtech,ph01-proxraw-strength = <2>;
         semtech,ph23-proxraw-strength = <2>;
         semtech,avg-pos-strength = <64>;
+        semtech,input-precharge-resistor-ohms = <2000>;
       };
     };