Kernel-3.10.0-957.el7_i2c-designware

• Synopsys DesignWare I2C

Required properties :

• compatible : should be “snps,designware-i2c”
• reg : Offset and length of the register set for the device
• interrupts : where IRQ is the interrupt number.

Recommended properties :

• clock-frequency : desired I2C bus clock frequency in Hz.

Optional properties :

• i2c-sda-hold-time-ns : should contain the SDA hold time in nanoseconds.
  This option is only supported in hardware blocks version 1.11a or newer.

• i2c-scl-falling-time : should contain the SCL falling time in nanoseconds.
  This value which is by default 300ns is used to compute the tLOW period.

• i2c-sda-falling-time : should contain the SDA falling time in nanoseconds.
  This value which is by default 300ns is used to compute the tHIGH period.

Example :

i2c@f0000 {
    #address-cells = <1>;
    #size-cells = <0>;
    compatible = "snps,designware-i2c";
    reg = <0xf0000 0x1000>;
    interrupts = <11>;
    clock-frequency = <400000>;
};

i2c@1120000 {
    #address-cells = <1>;
    #size-cells = <0>;
    compatible = "snps,designware-i2c";
    reg = <0x1120000 0x1000>;
    interrupt-parent = <&ictl>;
    interrupts = <12 1>;
    clock-frequency = <400000>;
    i2c-sda-hold-time-ns = <300>;
    i2c-sda-falling-time-ns = <300>;
    i2c-scl-falling-time-ns = <300>;
};