From a7ff477bb7e5ec9536e8aac02e8856a4bcc595a3 Mon Sep 17 00:00:00 2001 From: Maxime Ripard Date: Mon, 10 Sep 2012 22:35:40 +0200 Subject: [PATCH] gpio: 74x164: dts: Add documentation for the dt binding Signed-off-by: Maxime Ripard Signed-off-by: Linus Walleij --- .../devicetree/bindings/gpio/gpio-74x164.txt | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) create mode 100644 Documentation/devicetree/bindings/gpio/gpio-74x164.txt 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>; +}; -- 2.7.4