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-General Purpose I2C Bus Mux
-
-This binding describes an I2C bus multiplexer that uses a mux controller
-from the mux subsystem to route the I2C signals.
-
- .-----. .-----.
- | dev | | dev |
- .------------. '-----' '-----'
- | SoC | | |
- | | .--------+--------'
- | .------. | .------+ child bus A, on MUX value set to 0
- | | I2C |-|--| Mux |
- | '------' | '--+---+ child bus B, on MUX value set to 1
- | .------. | | '----------+--------+--------.
- | | MUX- | | | | | |
- | | Ctrl |-|-----+ .-----. .-----. .-----.
- | '------' | | dev | | dev | | dev |
- '------------' '-----' '-----' '-----'
-
-Required properties:
-- compatible: i2c-mux
-- i2c-parent: The phandle of the I2C bus that this multiplexer's master-side
- port is connected to.
-- mux-controls: The phandle of the mux controller to use for operating the
- mux.
-* Standard I2C mux properties. See i2c-mux.txt in this directory.
-* I2C child bus nodes. See i2c-mux.txt in this directory. The sub-bus number
- is also the mux-controller state described in ../mux/mux-controller.txt
-
-Optional properties:
-- mux-locked: If present, explicitly allow unrelated I2C transactions on the
- parent I2C adapter at these times:
- + during setup of the multiplexer
- + between setup of the multiplexer and the child bus I2C transaction
- + between the child bus I2C transaction and releasing of the multiplexer
- + during releasing of the multiplexer
- However, I2C transactions to devices behind all I2C multiplexers connected
- to the same parent adapter that this multiplexer is connected to are blocked
- for the full duration of the complete multiplexed I2C transaction (i.e.
- including the times covered by the above list).
- If mux-locked is not present, the multiplexer is assumed to be parent-locked.
- This means that no unrelated I2C transactions are allowed on the parent I2C
- adapter for the complete multiplexed I2C transaction.
- The properties of mux-locked and parent-locked multiplexers are discussed
- in more detail in Documentation/i2c/i2c-topology.rst.
-
-For each i2c child node, an I2C child bus will be created. They will
-be numbered based on their order in the device tree.
-
-Whenever an access is made to a device on a child bus, the value set
-in the relevant node's reg property will be set as the state in the
-mux controller.
-
-Example:
- mux: mux-controller {
- compatible = "gpio-mux";
- #mux-control-cells = <0>;
-
- mux-gpios = <&pioA 0 GPIO_ACTIVE_HIGH>,
- <&pioA 1 GPIO_ACTIVE_HIGH>;
- };
-
- i2c-mux {
- compatible = "i2c-mux";
- mux-locked;
- i2c-parent = <&i2c1>;
-
- mux-controls = <&mux>;
-
- #address-cells = <1>;
- #size-cells = <0>;
-
- i2c@1 {
- reg = <1>;
- #address-cells = <1>;
- #size-cells = <0>;
-
- ssd1307: oled@3c {
- compatible = "solomon,ssd1307fb-i2c";
- reg = <0x3c>;
- pwms = <&pwm 4 3000>;
- reset-gpios = <&gpio2 7 1>;
- reset-active-low;
- };
- };
-
- i2c@3 {
- reg = <3>;
- #address-cells = <1>;
- #size-cells = <0>;
-
- pca9555: pca9555@20 {
- compatible = "nxp,pca9555";
- gpio-controller;
- #gpio-cells = <2>;
- reg = <0x20>;
- };
- };
- };