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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/Documentation/devicetree/bindings/i2c/i2c-mux.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-mux.yaml#

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

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title: Common i2c bus multiplexer/switch properties.

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maintainers:

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  - Peter Rosin <peda@axentia.se>

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description: |+

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  An i2c bus multiplexer/switch will have several child busses that are numbered

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  uniquely in a device dependent manner.  The nodes for an i2c bus

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  multiplexer/switch will have one child node for each child bus.

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  For i2c multiplexers/switches that have child nodes that are a mixture of both

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  i2c child busses and other child nodes, the 'i2c-mux' subnode can be used for

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  populating the i2c child busses.  If an 'i2c-mux' subnode is present, only

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  subnodes of this will be considered as i2c child busses.

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properties:

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  $nodename:

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    pattern: '^(i2c-?)?mux'

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  '#address-cells':

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    const: 1

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  '#size-cells':

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    const: 0

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patternProperties:

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  '^i2c@[0-9a-f]+$':

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

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    unevaluatedProperties: false

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    properties:

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      reg:

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        description: The mux selector sub-bus number for the child I2C bus.

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        maxItems: 1

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additionalProperties: true

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examples:

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  - |

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    /*

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     * An NXP pca9548 8 channel I2C multiplexer at address 0x70

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     * with two NXP pca8574 GPIO expanders attached, one each to

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     * ports 3 and 4.

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     */

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    i2c {

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        #address-cells = <1>;

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        #size-cells = <0>;

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        i2c-mux@70 {

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            compatible = "nxp,pca9548";

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            reg = <0x70>;

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            #address-cells = <1>;

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            #size-cells = <0>;

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            i2c@3 {

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                #address-cells = <1>;

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                #size-cells = <0>;

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                reg = <3>;

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                gpio@20 {

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                    compatible = "nxp,pca9555";

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                    gpio-controller;

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                    #gpio-cells = <2>;

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                    reg = <0x20>;

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                };

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            };

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            i2c@4 {

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                #address-cells = <1>;

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                #size-cells = <0>;

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                reg = <4>;

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                gpio@20 {

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                    compatible = "nxp,pca9555";

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                    gpio-controller;

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                    #gpio-cells = <2>;

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                    reg = <0x20>;

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                };

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            };

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        };

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    };

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...

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