mirror of
https://git.proxmox.com/git/mirror_ubuntu-kernels.git
synced 2025-12-08 14:28:42 +00:00
8f2cade5da
In some cases, it is required to provide the state to which the mux controller has to be set to, from the consumer device tree node. Document the property mux-states that can be used for adding this support. Signed-off-by: Aswath Govindraju <a-govindraju@ti.com> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Peter Rosin <peda@axentia.se> Link: https://lore.kernel.org/r/f4d02ac8-23ee-d891-4056-75c672cc59c9@axentia.se Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
100 lines
2.0 KiB
YAML
100 lines
2.0 KiB
YAML
# SPDX-License-Identifier: GPL-2.0
|
|
%YAML 1.2
|
|
---
|
|
$id: http://devicetree.org/schemas/mux/gpio-mux.yaml#
|
|
$schema: http://devicetree.org/meta-schemas/core.yaml#
|
|
|
|
title: GPIO-based multiplexer controller bindings
|
|
|
|
maintainers:
|
|
- Peter Rosin <peda@axentia.se>
|
|
|
|
description: |+
|
|
Define what GPIO pins are used to control a multiplexer. Or several
|
|
multiplexers, if the same pins control more than one multiplexer.
|
|
|
|
The multiplexer state is defined as the number represented by the
|
|
multiplexer GPIO pins, where the first pin is the least significant
|
|
bit. An active pin is a binary 1, an inactive pin is a binary 0.
|
|
|
|
properties:
|
|
compatible:
|
|
const: gpio-mux
|
|
|
|
mux-gpios:
|
|
description:
|
|
List of gpios used to control the multiplexer, least significant bit first.
|
|
|
|
'#mux-control-cells':
|
|
enum: [ 0, 1 ]
|
|
|
|
'#mux-state-cells':
|
|
enum: [ 1, 2 ]
|
|
|
|
idle-state:
|
|
default: -1
|
|
|
|
required:
|
|
- compatible
|
|
- mux-gpios
|
|
anyOf:
|
|
- required:
|
|
- "#mux-control-cells"
|
|
- required:
|
|
- "#mux-state-cells"
|
|
|
|
additionalProperties: false
|
|
|
|
examples:
|
|
- |
|
|
#include <dt-bindings/gpio/gpio.h>
|
|
|
|
mux: mux-controller {
|
|
compatible = "gpio-mux";
|
|
#mux-control-cells = <0>;
|
|
|
|
mux-gpios = <&pioA 0 GPIO_ACTIVE_HIGH>,
|
|
<&pioA 1 GPIO_ACTIVE_HIGH>;
|
|
};
|
|
|
|
adc-mux {
|
|
compatible = "io-channel-mux";
|
|
io-channels = <&adc 0>;
|
|
io-channel-names = "parent";
|
|
|
|
mux-controls = <&mux>;
|
|
|
|
channels = "sync-1", "in", "out", "sync-2";
|
|
};
|
|
|
|
i2c-mux {
|
|
compatible = "i2c-mux";
|
|
i2c-parent = <&i2c1>;
|
|
|
|
mux-controls = <&mux>;
|
|
|
|
#address-cells = <1>;
|
|
#size-cells = <0>;
|
|
|
|
i2c@0 {
|
|
reg = <0>;
|
|
#address-cells = <1>;
|
|
#size-cells = <0>;
|
|
|
|
ssd1307: oled@3c {
|
|
reg = <0x3c>;
|
|
};
|
|
};
|
|
|
|
i2c@3 {
|
|
reg = <3>;
|
|
#address-cells = <1>;
|
|
#size-cells = <0>;
|
|
|
|
pca9555: pca9555@20 {
|
|
reg = <0x20>;
|
|
};
|
|
};
|
|
};
|
|
...
|