tjh.dev
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1Device tree configuration for the I2C busses on the AST24XX and AST25XX SoCs.
2
3Required 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
16Optional 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
21Example:
22
23i2c {
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};