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

   1 Device tree configuration for the I2C busses on the AST24XX and AST25XX SoCs.
   2
   3 Required Properties:
   4 - #address-cells        : should be 1
   5 - #size-cells           : should be 0
   6 - reg                   : address offset and range of bus
   7 - compatible            : should be "aspeed,ast2400-i2c-bus"
   8                           or "aspeed,ast2500-i2c-bus"
   9 - clocks                : root clock of bus, should reference the APB
  10                           clock
  11 - interrupts            : interrupt number
  12 - interrupt-parent      : interrupt controller for bus, should reference a
  13                           aspeed,ast2400-i2c-ic or aspeed,ast2500-i2c-ic
  14                           interrupt controller
  15
  16 Optional Properties:
  17 - bus-frequency : frequency of the bus clock in Hz defaults to 100 kHz when not
  18                   specified
  19 - multi-master  : states that there is another master active on this bus.
  20
  21 Example:
  22
  23 i2c {
  24         compatible = "simple-bus";
  25         #address-cells = <1>;
  26         #size-cells = <1>;
  27         ranges = <0 0x1e78a000 0x1000>;
  28
  29         i2c_ic: interrupt-controller@0 {
  30                 #interrupt-cells = <1>;
  31                 compatible = "aspeed,ast2400-i2c-ic";
  32                 reg = <0x0 0x40>;
  33                 interrupts = <12>;
  34                 interrupt-controller;
  35         };
  36
  37         i2c0: i2c-bus@40 {
  38                 #address-cells = <1>;
  39                 #size-cells = <0>;
  40                 #interrupt-cells = <1>;
  41                 reg = <0x40 0x40>;
  42                 compatible = "aspeed,ast2400-i2c-bus";
  43                 clocks = <&clk_apb>;
  44                 bus-frequency = <100000>;
  45                 interrupts = <0>;
  46                 interrupt-parent = <&i2c_ic>;
  47         };
  48 };