projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 4a5705a9 CYT |
1 | Allwinner Reduced Serial Bus (RSB) controller |
| 2 | ||
| 3 | The RSB controller found on later Allwinner SoCs is an SMBus like 2 wire | |
| 4 | serial bus with 1 master and up to 15 slaves. It is represented by a node | |
| 5 | for the controller itself, and child nodes representing the slave devices. | |
| 6 | ||
| 7 | Required properties : | |
| 8 | ||
| 9 | - reg : Offset and length of the register set for the controller. | |
| 10 | - compatible : Shall be "allwinner,sun8i-a23-rsb". | |
| 11 | - interrupts : The interrupt line associated to the RSB controller. | |
| 12 | - clocks : The gate clk associated to the RSB controller. | |
| 13 | - resets : The reset line associated to the RSB controller. | |
| 14 | - #address-cells : shall be 1 | |
| 15 | - #size-cells : shall be 0 | |
| 16 | ||
| 17 | Optional properties : | |
| 18 | ||
| 19 | - clock-frequency : Desired RSB bus clock frequency in Hz. Maximum is 20MHz. | |
| 20 | If not set this defaults to 3MHz. | |
| 21 | ||
| 22 | Child nodes: | |
| 23 | ||
| 24 | An RSB controller node can contain zero or more child nodes representing | |
| 25 | slave devices on the bus. Child 'reg' properties should contain the slave | |
| 26 | device's hardware address. The hardware address is hardwired in the device, | |
| 27 | which can normally be found in the datasheet. | |
| 28 | ||
| 29 | Example: | |
| 30 | ||
| 31 | rsb@01f03400 { | |
| 32 | compatible = "allwinner,sun8i-a23-rsb"; | |
| 33 | reg = <0x01f03400 0x400>; | |
| 34 | interrupts = <0 39 4>; | |
| 35 | clocks = <&apb0_gates 3>; | |
| 36 | clock-frequency = <3000000>; | |
| 37 | resets = <&apb0_rst 3>; | |
| 38 | #address-cells = <1>; | |
| 39 | #size-cells = <0>; | |
| 40 | ||
| 41 | pmic@3e3 { | |
| 42 | compatible = "..."; | |
| 43 | reg = <0x3e3>; | |
| 44 | ||
| 45 | /* ... */ | |
| 46 | }; | |
| 47 | }; |