74 lines
2.0 KiB
YAML
74 lines
2.0 KiB
YAML
# SPDX-License-Identifier: GPL-2.0
|
|
%YAML 1.2
|
|
---
|
|
$id: http://devicetree.org/schemas/i2c/i2c-gpio.yaml#
|
|
$schema: http://devicetree.org/meta-schemas/core.yaml#
|
|
|
|
title: Bindings for GPIO bitbanged I2C
|
|
|
|
maintainers:
|
|
- Wolfram Sang <wolfram@the-dreams.de>
|
|
|
|
allOf:
|
|
- $ref: /schemas/i2c/i2c-controller.yaml#
|
|
|
|
properties:
|
|
compatible:
|
|
items:
|
|
- const: i2c-gpio
|
|
|
|
sda-gpios:
|
|
description:
|
|
gpio used for the sda signal, this should be flagged as
|
|
active high using open drain with (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)
|
|
from <dt-bindings/gpio/gpio.h> since the signal is by definition
|
|
open drain.
|
|
maxItems: 1
|
|
|
|
scl-gpios:
|
|
description:
|
|
gpio used for the scl signal, this should be flagged as
|
|
active high using open drain with (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)
|
|
from <dt-bindings/gpio/gpio.h> since the signal is by definition
|
|
open drain.
|
|
maxItems: 1
|
|
|
|
i2c-gpio,scl-output-only:
|
|
description: scl as output only
|
|
type: boolean
|
|
|
|
i2c-gpio,delay-us:
|
|
description: delay between GPIO operations (may depend on each platform)
|
|
$ref: /schemas/types.yaml#/definitions/uint32
|
|
|
|
i2c-gpio,timeout-ms:
|
|
description: timeout to get data
|
|
$ref: /schemas/types.yaml#/definitions/uint32
|
|
|
|
# Deprecated properties, do not use in new device tree sources:
|
|
gpios:
|
|
minItems: 2
|
|
maxItems: 2
|
|
description: sda and scl gpio, alternative for {sda,scl}-gpios
|
|
|
|
i2c-gpio,sda-open-drain:
|
|
# Generate a warning if present
|
|
not: true
|
|
description: this means that something outside of our control has put
|
|
the GPIO line used for SDA into open drain mode, and that something is
|
|
not the GPIO chip. It is essentially an inconsistency flag.
|
|
|
|
i2c-gpio,scl-open-drain:
|
|
# Generate a warning if present
|
|
not: true
|
|
description: this means that something outside of our control has put the
|
|
GPIO line used for SCL into open drain mode, and that something is not
|
|
the GPIO chip. It is essentially an inconsistency flag.
|
|
|
|
required:
|
|
- compatible
|
|
- sda-gpios
|
|
- scl-gpios
|
|
|
|
...
|