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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/Documentation/devicetree/bindings/i2c/i2c-gpio.yaml
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# SPDX-License-Identifier: GPL-2.0

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%YAML 1.2

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---

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$id: http://devicetree.org/schemas/i2c/i2c-gpio.yaml#

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$schema: http://devicetree.org/meta-schemas/core.yaml#

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title: GPIO bitbanged I2C

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maintainers:

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  - Wolfram Sang <wsa@kernel.org>

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allOf:

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  - $ref: /schemas/i2c/i2c-controller.yaml#

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properties:

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  compatible:

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    items:

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      - const: i2c-gpio

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  sda-gpios:

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    description:

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      gpio used for the sda signal, this should be flagged as

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      active high using open drain with (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)

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      from <dt-bindings/gpio/gpio.h> since the signal is by definition

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      open drain.

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    maxItems: 1

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  scl-gpios:

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    description:

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      gpio used for the scl signal, this should be flagged as

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      active high using open drain with (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)

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      from <dt-bindings/gpio/gpio.h> since the signal is by definition

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      open drain.

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    maxItems: 1

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  i2c-gpio,sda-output-only:

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    description: sda as output only

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    type: boolean

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  i2c-gpio,scl-output-only:

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    description: scl as output only

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    type: boolean

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  i2c-gpio,delay-us:

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    description: delay between GPIO operations (may depend on each platform)

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  i2c-gpio,timeout-ms:

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    description: timeout to get data

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  # Deprecated properties, do not use in new device tree sources:

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  gpios:

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    minItems: 2

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    maxItems: 2

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    description: sda and scl gpio, alternative for {sda,scl}-gpios

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  i2c-gpio,sda-open-drain:

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    type: boolean

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    deprecated: true

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    description: this means that something outside of our control has put

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      the GPIO line used for SDA into open drain mode, and that something is

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      not the GPIO chip. It is essentially an inconsistency flag.

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  i2c-gpio,scl-open-drain:

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    type: boolean

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    deprecated: true

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    description: this means that something outside of our control has put the

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      GPIO line used for SCL into open drain mode, and that something is not

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      the GPIO chip. It is essentially an inconsistency flag.

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  i2c-gpio,sda-has-no-pullup:

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    type: boolean

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    description: sda is used in a non-compliant way and has no pull-up.

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      Therefore disable open-drain. This property is mutually-exclusive

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      with i2c-gpio,sda-open-drain.

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  i2c-gpio,scl-has-no-pullup:

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    type: boolean

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    description: scl is used in a non-compliant way and has no pull-up.

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      Therefore disable open-drain. This property is mutually-exclusive

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      with i2c-gpio,scl-open-drain.

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dependencies:

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  i2c-gpio,sda-has-no-pullup:

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    not:

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      required:

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        - i2c-gpio,sda-open-drain

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  i2c-gpio,scl-has-no-pullup:

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    not:

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      required:

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        - i2c-gpio,scl-open-drain

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required:

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  - compatible

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  - sda-gpios

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  - scl-gpios

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unevaluatedProperties: false

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...

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