Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
88 lines
2.2 KiB
YAML
88 lines
2.2 KiB
YAML
# 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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