Lines Matching +full:i2c +full:- +full:controller

1 General Purpose I2C Bus Mux
3 This binding describes an I2C bus multiplexer that uses a mux controller
4 from the mux subsystem to route the I2C signals.
6                                   .-----.  .-----.
8     .------------.                '-----'  '-----'
10     |            |          .--------+--------'
11     |   .------. |  .------+    child bus A, on MUX value set to 0
12     |   | I2C  |-|--| Mux  |
13     |   '------' |  '--+---+    child bus B, on MUX value set to 1
14     |   .------. |     |    '----------+--------+--------.
15     |   | MUX- | |     |               |        |        |
16     |   | Ctrl |-|-----+            .-----.  .-----.  .-----.
17     |   '------' |                  | dev |  | dev |  | dev |
18     '------------'                  '-----'  '-----'  '-----'
21 - compatible: i2c-mux
22 - i2c-parent: The phandle of the I2C bus that this multiplexer's master-side
24 - mux-controls: The phandle of the mux controller to use for operating the
26 * Standard I2C mux properties. See i2c-mux.txt in this directory.
27 * I2C child bus nodes. See i2c-mux.txt in this directory. The sub-bus number
28   is also the mux-controller state described in ../mux/mux-controller.txt
31 - mux-locked: If present, explicitly allow unrelated I2C transactions on the
32   parent I2C adapter at these times:
34    + between setup of the multiplexer and the child bus I2C transaction
35    + between the child bus I2C transaction and releasing of the multiplexer
37   However, I2C transactions to devices behind all I2C multiplexers connected
39   for the full duration of the complete multiplexed I2C transaction (i.e.
41   If mux-locked is not present, the multiplexer is assumed to be parent-locked.
42   This means that no unrelated I2C transactions are allowed on the parent I2C
43   adapter for the complete multiplexed I2C transaction.
44   The properties of mux-locked and parent-locked multiplexers are discussed
45   in more detail in Documentation/i2c/i2c-topology.rst.
47 For each i2c child node, an I2C child bus will be created. They will
52 mux controller.
55 	mux: mux-controller {
56 		compatible = "gpio-mux";
57 		#mux-control-cells = <0>;
59 		mux-gpios = <&pioA 0 GPIO_ACTIVE_HIGH>,
63 	i2c-mux {
64 		compatible = "i2c-mux";
65 		mux-locked;
66 		i2c-parent = <&i2c1>;
68 		mux-controls = <&mux>;
70 		#address-cells = <1>;
71 		#size-cells = <0>;
73 		i2c@1 {
75 			#address-cells = <1>;
76 			#size-cells = <0>;
79 				compatible = "solomon,ssd1307fb-i2c";
82 				reset-gpios = <&gpio2 7 1>;
83 				reset-active-low;
87 		i2c@3 {
89 			#address-cells = <1>;
90 			#size-cells = <0>;
94 				gpio-controller;
95 				#gpio-cells = <2>;