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