Lines Matching +full:i2c +full:- +full:topology
1 # SPDX-License-Identifier: GPL-2.0
3 ---
4 $id: http://devicetree.org/schemas/i2c/i2c-mux-gpmux.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: General Purpose I2C Bus Mux
10 - Peter Rosin <peda@axentia.se>
13 This binding describes an I2C bus multiplexer that uses a mux controller
14 from the mux subsystem to route the I2C signals.
16 .-----. .-----.
18 .------------. '-----' '-----'
20 | | .--------+--------'
21 | .------. | .------+ child bus A, on MUX value set to 0
22 | | I2C |-|--| Mux |
23 | '------' | '--+---+ child bus B, on MUX value set to 1
24 | .------. | | '----------+--------+--------.
25 | | MUX- | | | | | |
26 | | Ctrl |-|-----+ .-----. .-----. .-----.
27 | '------' | | dev | | dev | | dev |
28 '------------' '-----' '-----' '-----'
33 - $ref: /schemas/i2c/i2c-mux.yaml#
37 const: i2c-mux
39 i2c-parent:
42 The phandle of the I2C bus that this multiplexer's master-side port is
45 mux-controls:
48 The mux-controller states are the I2C sub-bus numbers.
50 mux-locked:
53 Explicitly allow unrelated I2C transactions on the parent I2C adapter at
55 - during setup of the multiplexer
56 - between setup of the multiplexer and the child bus I2C transaction
57 - between the child bus I2C transaction and releasing of the multiplexer
58 - during releasing of the multiplexer
60 However, I2C transactions to devices behind all I2C multiplexers connected
62 for the full duration of the complete multiplexed I2C transaction (i.e.
64 If mux-locked is not present, the multiplexer is assumed to be parent-locked.
65 This means that no unrelated I2C transactions are allowed on the parent I2C
66 adapter for the complete multiplexed I2C transaction.
67 The properties of mux-locked and parent-locked multiplexers are discussed
68 in more detail in Documentation/i2c/i2c-topology.rst.
71 - compatible
72 - i2c-parent
73 - mux-controls
78 - |
79 #include <dt-bindings/gpio/gpio.h>
80 mux: mux-controller {
81 compatible = "gpio-mux";
82 #mux-control-cells = <0>;
84 mux-gpios = <&pioA 0 GPIO_ACTIVE_HIGH>,
88 i2c-mux {
89 compatible = "i2c-mux";
90 mux-locked;
91 i2c-parent = <&i2c1>;
93 mux-controls = <&mux>;
95 #address-cells = <1>;
96 #size-cells = <0>;
98 i2c@1 {
100 #address-cells = <1>;
101 #size-cells = <0>;
105 gpio-controller;
106 #gpio-cells = <2>;
111 i2c@3 {
113 #address-cells = <1>;
114 #size-cells = <0>;
118 gpio-controller;
119 #gpio-cells = <2>;