These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / Documentation / devicetree / bindings / bus / sunxi-rsb.txt

diff --git a/kernel/Documentation/devicetree/bindings/bus/sunxi-rsb.txt b/kernel/Documentation/devicetree/bindings/bus/sunxi-rsb.txt
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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@01f03400 {
+               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>;
+
+                       /* ... */
+               };
+       };