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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-06-10 05:30:17 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-06-10 05:30:17 -0300
commitd635711daa98be86d4c7fd01499c34f566b54ccb (patch)
treeaa5cc3760a27c3d57146498cb82fa549547de06c /Documentation/devicetree/bindings/gpio/gpio-pisosr.txt
parentc91265cd0efb83778f015b4d4b1129bd2cfd075e (diff)
Linux-libre 4.6.2-gnu
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+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;
+ };