Kernel-4.18.0-80.el8_i2c

• I2C

The I2C controller is expressed as a bus under the CPM node.

Properties:

• compatible : “fsl,cpm1-i2c”, “fsl,cpm2-i2c”
• reg : On CPM2 devices, the second resource doesn’t specify the I2C
  Parameter RAM itself, but the I2C_BASE field of the CPM2 Parameter RAM
  (typically 0x8afc 0x2).
• #address-cells : Should be one. The cell is the i2c device address with
  the r/w bit set to zero.
• #size-cells : Should be zero.
• clock-frequency : Can be used to set the i2c clock frequency. If
  unspecified, a default frequency of 60kHz is being used.
  The following two properties are deprecated. They are only used by legacy
  i2c drivers to find the bus to probe:
• linux,i2c-index : Can be used to hard code an i2c bus number. By default,
  the bus number is dynamically assigned by the i2c core.
• linux,i2c-class : Can be used to override the i2c class. The class is used
  by legacy i2c device drivers to find a bus in a specific context like
  system management, video or sound. By default, I2C_CLASS_HWMON (1) is
  being used. The definition of the classes can be found in
  include/i2c/i2c.h

Example, based on mpc823:

i2c@860 {
    compatible = "fsl,mpc823-i2c",
             "fsl,cpm1-i2c";
    reg = <0x860 0x20 0x3c80 0x30>;
    interrupts = <16>;
    interrupt-parent = <&CPM_PIC>;
    fsl,cpm-command = <0x10>;
    #address-cells = <1>;
    #size-cells = <0>;

    rtc@68 {
        compatible = "dallas,ds1307";
        reg = <0x68>;
    };
};