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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/Documentation/devicetree/bindings/gpio/gpio-delay.yaml
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# 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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                            -

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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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