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