[PATCH] dt-bindings: mfd: gateworks-gsc: Add fan-tach mode

[Tim Harvey]

In 7497d4a66c59 ("hwmon: (gsc-hwmon) add fan sensor") a mode
was added to report RPM's from a fan tach input.

Add this mode to the dt-bindings for the Gateworks System Controller.

Signed-off-by: Tim Harvey <tharvey@xxxxxxxxxxxxx>
---
 Documentation/devicetree/bindings/mfd/gateworks-gsc.yaml | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/mfd/gateworks-gsc.yaml b/Documentation/devicetree/bindings/mfd/gateworks-gsc.yaml
index d08e8fe..5a1e8d2 100644
--- a/Documentation/devicetree/bindings/mfd/gateworks-gsc.yaml
+++ b/Documentation/devicetree/bindings/mfd/gateworks-gsc.yaml
@@ -83,8 +83,9 @@ properties:
                 2 - scaled voltage based on an optional resistor divider
                     and optional offset
                 3 - pre-scaled 16-bit voltage value
+                4 - fan tach input to report RPM's
             $ref: /schemas/types.yaml#/definitions/uint32
-            enum: [0, 1, 2, 3]
+            enum: [0, 1, 2, 3, 4]
 
           gw,voltage-divider-ohms:
             description: Values of resistors for divider on raw ADC input
-- 
2.7.4