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-GPIO-based I2C Bus Mux
-
-This binding describes an I2C bus multiplexer that uses GPIOs to
-route the I2C signals.
-
- +-----+ +-----+
- | dev | | dev |
- +------------+ +-----+ +-----+
- | SoC | | |
- | | /--------+--------+
- | +------+ | +------+ child bus A, on GPIO value set to 0
- | | I2C |-|--| Mux |
- | +------+ | +--+---+ child bus B, on GPIO value set to 1
- | | | \----------+--------+--------+
- | +------+ | | | | |
- | | GPIO |-|-----+ +-----+ +-----+ +-----+
- | +------+ | | dev | | dev | | dev |
- +------------+ +-----+ +-----+ +-----+
-
-Required properties:
-- compatible: i2c-mux-gpio
-- i2c-parent: The phandle of the I2C bus that this multiplexer's master-side
- port is connected to.
-- mux-gpios: list of gpios used to control the muxer
-* Standard I2C mux properties. See i2c-mux.yaml in this directory.
-* I2C child bus nodes. See i2c-mux.yaml in this directory.
-
-Optional properties:
-- idle-state: value to set the muxer to when idle. When no value is
- given, it defaults to the last value used.
-
-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 output using the list of
-GPIOs, the first in the list holding the least-significant value.
-
-If an idle state is defined, using the idle-state (optional) property,
-whenever an access is not being made to a device on a child bus, the
-GPIOs will be set according to the idle value.
-
-If an idle state is not defined, the most recently used value will be
-left programmed into hardware whenever no access is being made to a
-device on a child bus.
-
-Example:
- i2cmux {
- compatible = "i2c-mux-gpio";
- #address-cells = <1>;
- #size-cells = <0>;
- mux-gpios = <&gpio1 22 0 &gpio1 23 0>;
- i2c-parent = <&i2c1>;
-
- 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>;
- };
- };
-
- i2c@3 {
- reg = <3>;
- #address-cells = <1>;
- #size-cells = <0>;
-
- pca9555: pca9555@20 {
- compatible = "nxp,pca9555";
- gpio-controller;
- #gpio-cells = <2>;
- reg = <0x20>;
- };
- };
- };