tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1* Generic 8-bits shift register GPIO driver
2
3Required properties:
4- compatible: Should contain one of the following:
5 "fairchild,74hc595"
6 "nxp,74lvc594"
7- reg : chip select number
8- gpio-controller : Marks the device node as a gpio controller.
9- #gpio-cells : Should be two. The first cell is the pin number and
10 the second cell is used to specify the gpio polarity:
11 0 = active high
12 1 = active low
13- registers-number: Number of daisy-chained shift registers
14
15Optional properties:
16- enable-gpios: GPIO connected to the OE (Output Enable) pin.
17
18Example:
19
20gpio5: gpio5@0 {
21 compatible = "fairchild,74hc595";
22 reg = <0>;
23 gpio-controller;
24 #gpio-cells = <2>;
25 registers-number = <4>;
26 spi-max-frequency = <100000>;
27};