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 in the second cell
  11 - resets                : phandle to reset controller with the reset number in
  12                           the second cell
  13 - interrupts            : interrupt number
  14 - interrupt-parent      : interrupt controller for bus, should reference a
  15                           aspeed,ast2400-i2c-ic or aspeed,ast2500-i2c-ic
  16                           interrupt controller
  17
  18 Optional Properties:
  19 - bus-frequency : frequency of the bus clock in Hz defaults to 100 kHz when not
  20                   specified
  21 - multi-master  : states that there is another master active on this bus.
  22
  23 Example:
  24
  25 i2c {
  26         compatible = "simple-bus";
  27         #address-cells = <1>;
  28         #size-cells = <1>;
  29         ranges = <0 0x1e78a000 0x1000>;
  30
  31         i2c_ic: interrupt-controller@0 {
  32                 #interrupt-cells = <1>;
  33                 compatible = "aspeed,ast2400-i2c-ic";
  34                 reg = <0x0 0x40>;
  35                 interrupts = <12>;
  36                 interrupt-controller;
  37         };
  38
  39         i2c0: i2c-bus@40 {
  40                 #address-cells = <1>;
  41                 #size-cells = <0>;
  42                 #interrupt-cells = <1>;
  43                 reg = <0x40 0x40>;
  44                 compatible = "aspeed,ast2400-i2c-bus";
  45                 clocks = <&syscon ASPEED_CLK_APB>;
  46                 resets = <&syscon ASPEED_RESET_I2C>;
  47                 bus-frequency = <100000>;
  48                 interrupts = <0>;
  49                 interrupt-parent = <&i2c_ic>;
  50         };
  51 };