summaryrefslogtreecommitdiffstats
path: root/Documentation/devicetree/bindings/gpio/gpio-74x164.txt
diff options
context:
space:
mode:
Diffstat (limited to 'Documentation/devicetree/bindings/gpio/gpio-74x164.txt')
-rw-r--r--Documentation/devicetree/bindings/gpio/gpio-74x164.txt22
1 files changed, 22 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/gpio/gpio-74x164.txt b/Documentation/devicetree/bindings/gpio/gpio-74x164.txt
new file mode 100644
index 000000000000..cc2608021f26
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/gpio-74x164.txt
@@ -0,0 +1,22 @@
+* Generic 8-bits shift register GPIO driver
+
+Required properties:
+- compatible : Should be "fairchild,74hc595"
+- reg : chip select number
+- gpio-controller : Marks the device node as a gpio controller.
+- #gpio-cells : Should be two. The first cell is the pin number and
+ the second cell is used to specify the gpio polarity:
+ 0 = active high
+ 1 = active low
+- registers-number: Number of daisy-chained shift registers
+
+Example:
+
+gpio5: gpio5@0 {
+ compatible = "fairchild,74hc595";
+ reg = <0>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ registers-number = <4>;
+ spi-max-frequency = <100000>;
+};