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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/gpio/pisosr-gpio.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Generic Parallel-in/Serial-out Shift Register GPIO Driver
description:
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.
maintainers:
- Frank Li <Frank.Li@nxp.com>
properties:
compatible:
enum:
- pisosr-gpio
gpio-controller: true
'#gpio-cells':
const: 2
ngpios:
maximum: 32
default: 8
load-gpios:
description:
GPIO pin specifier attached to load enable, this
pin is pulsed before reading from the device to
load input pin values into the device.
spi-cpol: true
required:
- compatible
- gpio-controller
- '#gpio-cells'
allOf:
- $ref: /schemas/spi/spi-peripheral-props.yaml#
unevaluatedProperties: false
examples:
- |
#include <dt-bindings/gpio/gpio.h>
spi {
#address-cells = <1>;
#size-cells = <0>;
gpio@0 {
compatible = "pisosr-gpio";
reg = <0>;
gpio-controller;
#gpio-cells = <2>;
load-gpios = <&gpio2 23 GPIO_ACTIVE_LOW>;
spi-max-frequency = <1000000>;
spi-cpol;
};
};
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