48 lines
1.4 KiB
Text
48 lines
1.4 KiB
Text
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Allwinner Reduced Serial Bus (RSB) controller
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The RSB controller found on later Allwinner SoCs is an SMBus like 2 wire
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serial bus with 1 master and up to 15 slaves. It is represented by a node
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for the controller itself, and child nodes representing the slave devices.
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Required properties :
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- reg : Offset and length of the register set for the controller.
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- compatible : Shall be "allwinner,sun8i-a23-rsb".
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- interrupts : The interrupt line associated to the RSB controller.
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- clocks : The gate clk associated to the RSB controller.
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- resets : The reset line associated to the RSB controller.
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- #address-cells : shall be 1
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- #size-cells : shall be 0
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Optional properties :
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- clock-frequency : Desired RSB bus clock frequency in Hz. Maximum is 20MHz.
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If not set this defaults to 3MHz.
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Child nodes:
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An RSB controller node can contain zero or more child nodes representing
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slave devices on the bus. Child 'reg' properties should contain the slave
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device's hardware address. The hardware address is hardwired in the device,
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which can normally be found in the datasheet.
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Example:
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rsb@01f03400 {
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compatible = "allwinner,sun8i-a23-rsb";
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reg = <0x01f03400 0x400>;
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interrupts = <0 39 4>;
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clocks = <&apb0_gates 3>;
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clock-frequency = <3000000>;
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resets = <&apb0_rst 3>;
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#address-cells = <1>;
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#size-cells = <0>;
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pmic@3e3 {
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compatible = "...";
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reg = <0x3e3>;
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/* ... */
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};
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};
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