On 04/01/17 12:16, Peter Rosin wrote:
> Signed-off-by: Peter Rosin <peda@xxxxxxxxxx>
Looks good to me.
Acked-by: Jonathan Cameron <jic23@xxxxxxxxxx>
> ---
> .../devicetree/bindings/i2c/i2c-mux-simple.txt | 81 ++++++++++++++++++++++
> 1 file changed, 81 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/i2c/i2c-mux-simple.txt
>
> diff --git a/Documentation/devicetree/bindings/i2c/i2c-mux-simple.txt b/Documentation/devicetree/bindings/i2c/i2c-mux-simple.txt
> new file mode 100644
> index 000000000000..253d5027843b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/i2c/i2c-mux-simple.txt
> @@ -0,0 +1,81 @@
> +Simple 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-simple,mux-locked or i2c-mux-simple,parent-locked
> +- 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
> +
> +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 = "mux-gpio";
> + #mux-control-cells = <0>;
> +
> + mux-gpios = <&pioA 0 GPIO_ACTIVE_HIGH>,
> + <&pioA 1 GPIO_ACTIVE_HIGH>;
> + };
> +
> + i2c-mux {
> + compatible = "i2c-mux-simple,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>;
> + };
> + };
> + };
>
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