Reduced Serial Bus is a proprietary 2-line push-pull serial bus
supporting multiple slave devices.
It was developed by Allwinner, Inc. and used by Allwinner and X-Powers,
Inc. for their line of PMICs and other peripheral ICs.
Signed-off-by: Chen-Yu Tsai <wens@xxxxxxxx>
---
Documentation/devicetree/bindings/rsb/rsb.txt | 50 +++++++++++++++++++++++++++
1 file changed, 50 insertions(+)
create mode 100644 Documentation/devicetree/bindings/rsb/rsb.txt
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+Reduced Serial Bus (RSB) Controller
+
+This document defines a generic set of bindings for use by RSB controllers.
+A controller is modelled in device tree as a node with zero or more child
+nodes, each representing a unique slave device on the bus.
+
+Required properties:
+
+ - #address-cells : must be 2
+ - #size-cells : must be 0
+
+Optional properties:
+
+ - clock-frequency : Desired bus clock frequency in Hz. Maximum is 20 MHz.
+
+Child nodes:
+
+An RSB controller node can contain zero or more child nodes representing
+slave devices on the bus. Child 'reg' properties are specified as a
+runtime address, hardware address pair. The hardware address is hardwired
+in the device, which can normally be found in the datasheet. The runtime
+address is set by software. No 2 devices on the same bus shall have the
+same runtime address.
+
+Valid runtime addresses - There are only 15 valid runtime addresses:
+
+ 0x17, 0x2d, 0x3a, 0x4e, 0x59, 0x63, 0x74, 0x8b,
+ 0x9c, 0xa6, 0xb1, 0xc5, 0xd2, 0xe8, 0xff
+
+It is highly recommended that one choose the same runtime addresses as
+vendor BSPs use so that a) the addresses remain the same across different
+software systems, and b) addresses of supported and listed slave devices
+don't conflict with unsupported or not yet listed devices.
+
+Example:
+
+ rsb@... {
+ compatible = "...";
+ reg = <...>;
+ /* ... */
+ #address-cells = <2>;
+ #size-cells = <0>;
+
+ pmic@2d {
+ compatible = "...";
+ reg = <0x2d 0x3e3>;
+
+ /* ... */
+ };
+ };
--
2.5.0
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