Documentation/devicetree/bindings/i2c/i2c-designware.txt

   1 * Synopsys DesignWare I2C
   2
   3 Required properties :
   4
   5  - compatible : should be "snps,designware-i2c"
   6  - reg : Offset and length of the register set for the device
   7  - interrupts : <IRQ> where IRQ is the interrupt number.
   8
   9 Recommended properties :
  10
  11  - clock-frequency : desired I2C bus clock frequency in Hz.
  12
  13 Optional properties :
  14  - i2c-sda-hold-time-ns : should contain the SDA hold time in nanoseconds.
  15    This option is only supported in hardware blocks version 1.11a or newer.
  16
  17  - i2c-scl-falling-time-ns : should contain the SCL falling time in nanoseconds.
  18    This value which is by default 300ns is used to compute the tLOW period.
  19
  20  - i2c-sda-falling-time-ns : should contain the SDA falling time in nanoseconds.
  21    This value which is by default 300ns is used to compute the tHIGH period.
  22
  23 Example :
  24
  25         i2c@f0000 {
  26                 #address-cells = <1>;
  27                 #size-cells = <0>;
  28                 compatible = "snps,designware-i2c";
  29                 reg = <0xf0000 0x1000>;
  30                 interrupts = <11>;
  31                 clock-frequency = <400000>;
  32         };
  33
  34         i2c@1120000 {
  35                 #address-cells = <1>;
  36                 #size-cells = <0>;
  37                 compatible = "snps,designware-i2c";
  38                 reg = <0x1120000 0x1000>;
  39                 interrupt-parent = <&ictl>;
  40                 interrupts = <12 1>;
  41                 clock-frequency = <400000>;
  42                 i2c-sda-hold-time-ns = <300>;
  43                 i2c-sda-falling-time-ns = <300>;
  44                 i2c-scl-falling-time-ns = <300>;
  45         };