88 lines
2.2 KiB
YAML
88 lines
2.2 KiB
YAML
|
# SPDX-License-Identifier: GPL-2.0
|
||
|
|
%YAML 1.2
|
||
|
|
---
|
||
|
|
$id: http://devicetree.org/schemas/i2c/i2c-mux.yaml#
|
||
|
|
$schema: http://devicetree.org/meta-schemas/core.yaml#
|
||
|
|
|
||
|
|
title: Common i2c bus multiplexer/switch properties.
|
||
|
|
|
||
|
|
maintainers:
|
||
|
|
- Peter Rosin <peda@axentia.se>
|
||
|
|
|
||
|
|
description: |+
|
||
|
|
An i2c bus multiplexer/switch will have several child busses that are numbered
|
||
|
|
uniquely in a device dependent manner. The nodes for an i2c bus
|
||
|
|
multiplexer/switch will have one child node for each child bus.
|
||
|
|
|
||
|
|
For i2c multiplexers/switches that have child nodes that are a mixture of both
|
||
|
|
i2c child busses and other child nodes, the 'i2c-mux' subnode can be used for
|
||
|
|
populating the i2c child busses. If an 'i2c-mux' subnode is present, only
|
||
|
|
subnodes of this will be considered as i2c child busses.
|
||
|
|
|
||
|
|
properties:
|
||
|
|
$nodename:
|
||
|
|
pattern: '^(i2c-?)?mux'
|
||
|
|
|
||
|
|
'#address-cells':
|
||
|
|
const: 1
|
||
|
|
|
||
|
|
'#size-cells':
|
||
|
|
const: 0
|
||
|
|
|
||
|
|
patternProperties:
|
||
|
|
'^i2c@[0-9a-f]+$':
|
||
|
|
$ref: /schemas/i2c/i2c-controller.yaml
|
||
|
|
unevaluatedProperties: false
|
||
|
|
|
||
|
|
properties:
|
||
|
|
reg:
|
||
|
|
description: The mux selector sub-bus number for the child I2C bus.
|
||
|
|
maxItems: 1
|
||
|
|
|
||
|
|
additionalProperties: true
|
||
|
|
|
||
|
|
examples:
|
||
|
|
- |
|
||
|
|
/*
|
||
|
|
* An NXP pca9548 8 channel I2C multiplexer at address 0x70
|
||
|
|
* with two NXP pca8574 GPIO expanders attached, one each to
|
||
|
|
* ports 3 and 4.
|
||
|
|
*/
|
||
|
|
i2c {
|
||
|
|
#address-cells = <1>;
|
||
|
|
#size-cells = <0>;
|
||
|
|
|
||
|
|
i2c-mux@70 {
|
||
|
|
compatible = "nxp,pca9548";
|
||
|
|
reg = <0x70>;
|
||
|
|
#address-cells = <1>;
|
||
|
|
#size-cells = <0>;
|
||
|
|
|
||
|
|
i2c@3 {
|
||
|
|
#address-cells = <1>;
|
||
|
|
#size-cells = <0>;
|
||
|
|
reg = <3>;
|
||
|
|
|
||
|
|
gpio@20 {
|
||
|
|
compatible = "nxp,pca9555";
|
||
|
|
gpio-controller;
|
||
|
|
#gpio-cells = <2>;
|
||
|
|
reg = <0x20>;
|
||
|
|
};
|
||
|
|
};
|
||
|
|
i2c@4 {
|
||
|
|
#address-cells = <1>;
|
||
|
|
#size-cells = <0>;
|
||
|
|
reg = <4>;
|
||
|
|
|
||
|
|
gpio@20 {
|
||
|
|
compatible = "nxp,pca9555";
|
||
|
|
gpio-controller;
|
||
|
|
#gpio-cells = <2>;
|
||
|
|
reg = <0x20>;
|
||
|
|
};
|
||
|
|
};
|
||
|
|
};
|
||
|
|
};
|
||
|
|
...
|