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[6/7] gpio: 74x164: dts: Add documentation for the dt binding

Message ID 1347020296-18796-7-git-send-email-maxime.ripard@free-electrons.com (mailing list archive)
State New, archived
Headers show

Commit Message

Maxime Ripard Sept. 7, 2012, 12:18 p.m. UTC 
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
---
 .../devicetree/bindings/gpio/gpio-74x164.txt       |   22 ++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/gpio-74x164.txt
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Patch

diff --git a/Documentation/devicetree/bindings/gpio/gpio-74x164.txt b/Documentation/devicetree/bindings/gpio/gpio-74x164.txt
new file mode 100644
index 0000000..cc26080
--- /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>;
+};