Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / Documentation / devicetree / bindings / gpio / gpio-adnp.txt

diff --git a/kernel/Documentation/devicetree/bindings/gpio/gpio-adnp.txt b/kernel/Documentation/devicetree/bindings/gpio/gpio-adnp.txt
new file mode 100644 (file)
index 0000000..af66b27
--- /dev/null
+++ b/kernel/Documentation/devicetree/bindings/gpio/gpio-adnp.txt
@@ -0,0 +1,34 @@
+Avionic Design N-bit GPIO expander bindings
+
+Required properties:
+- compatible: should be "ad,gpio-adnp"
+- reg: The I2C slave address for this device.
+- interrupt-parent: phandle of the parent interrupt controller.
+- interrupts: Interrupt specifier for the controllers interrupt.
+- #gpio-cells: Should be 2. The first cell is the GPIO number and the
+  second cell is used to specify optional parameters:
+  - bit 0: polarity (0: normal, 1: inverted)
+- gpio-controller: Marks the device as a GPIO controller
+- nr-gpios: The number of pins supported by the controller.
+
+The GPIO expander can optionally be used as an interrupt controller, in
+which case it uses the default two cell specifier as described in
+Documentation/devicetree/bindings/interrupt-controller/interrupts.txt.
+
+Example:
+
+       gpioext: gpio-controller@41 {
+               compatible = "ad,gpio-adnp";
+               reg = <0x41>;
+
+               interrupt-parent = <&gpio>;
+               interrupts = <160 1>;
+
+               gpio-controller;
+               #gpio-cells = <2>;
+
+               interrupt-controller;
+               #interrupt-cells = <2>;
+
+               nr-gpios = <64>;
+       };