| Device tree configuration for the I2C busses on the AST24XX and AST25XX SoCs. |
| |
| Required Properties: |
| - #address-cells : should be 1 |
| - #size-cells : should be 0 |
| - reg : address offset and range of bus |
| - compatible : should be "aspeed,ast2400-i2c-bus" |
| or "aspeed,ast2500-i2c-bus" |
| - clocks : root clock of bus, should reference the APB |
| clock |
| - interrupts : interrupt number |
| - interrupt-parent : interrupt controller for bus, should reference a |
| aspeed,ast2400-i2c-ic or aspeed,ast2500-i2c-ic |
| interrupt controller |
| |
| Optional Properties: |
| - bus-frequency : frequency of the bus clock in Hz defaults to 100 kHz when not |
| specified |
| - multi-master : states that there is another master active on this bus. |
| |
| Example: |
| |
| i2c { |
| compatible = "simple-bus"; |
| #address-cells = <1>; |
| #size-cells = <1>; |
| ranges = <0 0x1e78a000 0x1000>; |
| |
| i2c_ic: interrupt-controller@0 { |
| #interrupt-cells = <1>; |
| compatible = "aspeed,ast2400-i2c-ic"; |
| reg = <0x0 0x40>; |
| interrupts = <12>; |
| interrupt-controller; |
| }; |
| |
| i2c0: i2c-bus@40 { |
| #address-cells = <1>; |
| #size-cells = <0>; |
| #interrupt-cells = <1>; |
| reg = <0x40 0x40>; |
| compatible = "aspeed,ast2400-i2c-bus"; |
| clocks = <&clk_apb>; |
| bus-frequency = <100000>; |
| interrupts = <0>; |
| interrupt-parent = <&i2c_ic>; |
| }; |
| }; |
