Commit 45fe3fca authored by Andrew F. Davis's avatar Andrew F. Davis Committed by Linus Walleij

gpio: Add generic serializer DT binding

Add binding for generic parallel-in/serial-out shift register devices
used as GPIO.
Signed-off-by: default avatarAndrew F. Davis <afd@ti.com>
Acked-by: default avatarRob Herring <robh@kernel.org>
[Clarified ngpios semantic]
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent fae98164
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 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;
};
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment