Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / Documentation / devicetree / bindings / gpio / gpio-sx150x.txt

diff --git a/kernel/Documentation/devicetree/bindings/gpio/gpio-sx150x.txt b/kernel/Documentation/devicetree/bindings/gpio/gpio-sx150x.txt
new file mode 100644 (file)
index 0000000..ba2bb84
--- /dev/null
+++ b/kernel/Documentation/devicetree/bindings/gpio/gpio-sx150x.txt
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+SEMTECH SX150x GPIO expander bindings
+
+
+Required properties:
+
+- compatible: should be "semtech,sx1506q",
+                       "semtech,sx1508q",
+                       "semtech,sx1509q".
+
+- 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.
+
+- interrupt-controller: Marks the device as a interrupt 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:
+
+       i2c_gpio_expander@20{
+               #gpio-cells = <2>;
+               #interrupt-cells = <2>;
+               compatible = "semtech,sx1506q";
+               reg = <0x20>;
+               interrupt-parent = <&gpio_1>;
+               interrupts = <16 0>;
+
+               gpio-controller;
+               interrupt-controller;
+       };