# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id:
http://devicetree.org/schemas/gpio/gpio-delay.yaml#
$schema:
http://devicetree.org/meta-schemas/core.yaml#
title: GPIO delay controller
maintainers:
- Alexander Stein <linux@ew.tq-group.com>
description: |
This binding describes an electrical setup where setting an GPIO output
is delayed by some external setup, e.g. RC circuit.
+----------+ +-----------+
| | VCC_B | |
| | | | |
| | VCC_A _ | |
| GPIO | | | R | Consumer |
|controller| ___ |_| | |
| | | | | | |
| [IOx|-------| |--+-----|-----+ |
| | |___| | | input |
| | | | |
+----------+ --- C +-----------+
---
|
-
GND
If the input on the consumer is controlled by an open-drain signal
attached to an RC circuit the ramp-up delay is not under control
of the GPIO controller.
properties:
compatible:
const: gpio-delay
"#gpio-cells":
description: |
Specifies the pin, ramp-up and ramp-down delays. The
delays are specified in microseconds.
const: 3
gpios:
description: Array of GPIOs which output signal change is delayed
minItems: 1
maxItems: 32
gpio-controller: true
gpio-line-names:
minItems: 1
maxItems: 32
required:
- compatible
- "#gpio-cells"
- gpio-controller
- gpios
additionalProperties: false
examples:
- |
#include <dt-bindings/gpio/gpio.h>
enable_delay: enable-delay {
compatible = "gpio-delay";
#gpio-cells = <3>;
gpio-controller;
gpios = <&gpio0 3 GPIO_ACTIVE_LOW>,
<&gpio3 1 GPIO_ACTIVE_HIGH>;
};
consumer {
enable-gpios = <&enable_delay 0 130000 30000>;
};
