hwmon: Define binding for the nsa320-hwmon driver

Define a binding for the hardware monitoring chip present in the Zyxel
NSA-320 and some of the other Zyxel NAS devices.

Signed-off-by: Adam Baker <linux@baker-net.org.uk>
Acked-by: Rob Herring <robh@kernel.org>
[groeck: Fixed whitespace error]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/Documentation/devicetree/bindings/hwmon/nsa320-mcu.txt b/Documentation/devicetree/bindings/hwmon/nsa320-mcu.txt
new file mode 100644 (file)
index 0000000..0863e06
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwmon/nsa320-mcu.txt
@@ -0,0 +1,20 @@
+Bindings for the fan / temperature monitor microcontroller used on
+the Zyxel NSA 320 and several subsequent models.
+
+Required properties:
+- compatible   : "zyxel,nsa320-mcu"
+- data-gpios   : The GPIO pin connected to the data line on the MCU
+- clk-gpios    : The GPIO pin connected to the clock line on the MCU
+- act-gpios    : The GPIO pin connected to the active line on the MCU
+
+Example:
+
+       hwmon {
+               compatible = "zyxel,nsa320-mcu";
+               pinctrl-0 = <&pmx_mcu_data &pmx_mcu_clk &pmx_mcu_act>;
+               pinctrl-names = "default";
+
+               data-gpios = <&gpio0 14 GPIO_ACTIVE_HIGH>;
+               clk-gpios = <&gpio0 16 GPIO_ACTIVE_HIGH>;
+               act-gpios = <&gpio0 17 GPIO_ACTIVE_LOW>;
+       };