35 lines
1.0 KiB
Plaintext
35 lines
1.0 KiB
Plaintext
|
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 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;
|
||
|
|
};
|