Kernel-4.18.0-80.el8_i2c-aspee

Device tree configuration for the I2C busses on the AST24XX and AST25XX SoCs.

Required Properties:

• #address-cells : should be 1
• #size-cells : should be 0
• reg : address offset and range of bus
• compatible : should be “aspeed,ast2400-i2c-bus”

          or "aspeed,ast2500-i2c-bus"
  

• clocks : root clock of bus, should reference the APB

          clock in the second cell
  

• resets : phandle to reset controller with the reset number in

          the second cell
  

• interrupts : interrupt number
• interrupt-parent : interrupt controller for bus, should reference a

          aspeed,ast2400-i2c-ic or aspeed,ast2500-i2c-ic
          interrupt controller
  

Optional Properties:

• bus-frequency : frequency of the bus clock in Hz defaults to 100 kHz when not

      specified
  

• multi-master : states that there is another master active on this bus.

Example:

i2c {
compatible = “simple-bus”;
#address-cells = <1>;
#size-cells = <1>;
ranges = <0 0x1e78a000 0x1000>;

i2c_ic: interrupt-controller@0 {
    #interrupt-cells = <1>;
    compatible = "aspeed,ast2400-i2c-ic";
    reg = <0x0 0x40>;
    interrupts = <12>;
    interrupt-controller;
};

i2c0: i2c-bus@40 {
    #address-cells = <1>;
    #size-cells = <0>;
    #interrupt-cells = <1>;
    reg = <0x40 0x40>;
    compatible = "aspeed,ast2400-i2c-bus";
    clocks = <&syscon ASPEED_CLK_APB>;
    resets = <&syscon ASPEED_RESET_I2C>;
    bus-frequency = <100000>;
    interrupts = <0>;
    interrupt-parent = <&i2c_ic>;
};

};