1 files changed, 34 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/gpio/gpio-pisosr.txt b/Documentation/devicetree/bindings/gpio/gpio-pisosr.txt
new file mode 100644
index 000000000000..414a01cdf715
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/gpio-pisosr.txt
@@ -0,0 +1,34 @@
+Generic Parallel-in/Serial-out Shift Register GPIO Driver
+
+This binding describes generic parallel-in/serial-out shift register
+devices that can be used for GPI (General Purpose Input). This includes
+SN74165 serial-out shift registers and the SN65HVS88x series of
+industrial serializers.
+
+Required properties:
+ - compatible           : Should be "pisosr-gpio".
+ - gpio-controller      : Marks the device node as a GPIO controller.
+ - #gpio-cells          : Should be two. For consumer use see gpio.txt.
+
+Optional properties:
+ - ngpios               : Number of used GPIO lines (0..n-1), default is 8.
+ - load-gpios           : GPIO pin specifier attached to load enable, this
+                          pin is pulsed before reading from the device to
+                          load input pin values into the the device.
+
+For other required and optional properties of SPI slave
+nodes please refer to ../spi/spi-bus.txt.
+
+Example:
+
+        gpio@0 {
+                compatible = "ti,sn65hvs882", "pisosr-gpio";
+                gpio-controller;
+                #gpio-cells = <2>;
+
+                load-gpios = <&gpio2 23 GPIO_ACTIVE_LOW>;
+
+                reg = <0>;
+                spi-max-frequency = <1000000>;
+                spi-cpol;
+        };