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- 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 in the second cell
- - resets : phandle to reset controller with the reset number in
- the second cell
- - 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 = <&syscon ASPEED_CLK_APB>;
- resets = <&syscon ASPEED_RESET_I2C>;
- bus-frequency = <100000>;
- interrupts = <0>;
- interrupt-parent = <&i2c_ic>;
- };
- };
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