dt-bindings: mfd: Add Altera Arria10 SR Reset Controller bindings

This patch adds documentation for the Altera A10-SR Reset
Controller DT bindings.

Signed-off-by: Thor Thayer <thor.thayer@linux.intel.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

Documentation/devicetree/bindings/mfd/altera-a10sr.txt

@@ -18,6 +18,7 @@ The A10SR consists of these sub-devices:
 Device                   Description
 ------                   ----------
 a10sr_gpio               GPIO Controller
+a10sr_rst                Reset Controller
 
 Arria10 GPIO
 Required Properties:
@@ -27,6 +28,11 @@ Required Properties:
                       the second cell is used to specify flags.
                       See ../gpio/gpio.txt for more information.
 
+Arria10 Peripheral PHY Reset
+Required Properties:
+- compatible        : Should be "altr,a10sr-reset"
+- #reset-cells      : Should be one.
+
 Example:
 
         resource-manager@0 {
@@ -43,4 +49,9 @@ Example:
 			gpio-controller;
 			#gpio-cells = <2>;
 		};
+
+		a10sr_rst: reset-controller {
+			compatible = "altr,a10sr-reset";
+			#reset-cells = <1>;
+		};
 	};