| # 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>; |
| }; |
| }; |
| }; |
| }; |
| ... |
