This patch adds bindings for Soundwire Slave devices which includes how
SoundWire enumeration address is represented in SoundWire slave device
tree nodes.
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>
---
.../devicetree/bindings/soundwire/slave.txt | 46 +++++++++++++++++++
1 file changed, 46 insertions(+)
create mode 100644 Documentation/devicetree/bindings/soundwire/slave.txt
diff --git a/Documentation/devicetree/bindings/soundwire/slave.txt b/Documentation/devicetree/bindings/soundwire/slave.txt
new file mode 100644
index 000000000000..b8e8d34bbc92
--- /dev/null
+++ b/Documentation/devicetree/bindings/soundwire/slave.txt
@@ -0,0 +1,46 @@
+SoundWire slave device bindings.
+
+SoundWire is a 2-pin multi-drop interface with data and clock line.
+It facilitates development of low cost, efficient, high performance systems.
+
+SoundWire slave devices:
+Every SoundWire controller node can contain zero or more child nodes
+representing slave devices on the bus. Every SoundWire slave device is
+uniquely determined by the enumeration address containing 5 fields:
+SoundWire Version, Instance ID, Manufacturer ID, Part ID and Class ID
+for a device. Addition to below required properties, child nodes can
+have device specific bindings.
+
+Required property for SoundWire child node if it is present:
+- compatible: "sdwVER,MFD,PID,CID". The textual representation of
+ SoundWire Enumeration address comprising SoundWire
+ Version, Manufacturer ID, Part ID and Class ID,
+ shall be in lower-case hexadecimal with leading
+ zeroes suppressed.
+ Version number '0x10' represents SoundWire 1.0
+ Version number '0x11' represents SoundWire 1.1
+ ex: "sdw10,0217,2010,0"
+
+- sdw-instance-id: Should be ('Instance ID') from SoundWire
+ Enumeration Address. Instance ID is for the cases
+ where multiple Devices of the same type or Class
+ are attached to the bus.
+
+SoundWire example for Qualcomm's SoundWire controller:
+
+soundwire@c2d0000 {
+ compatible = "qcom,soundwire-v1.5.0"
+ reg = <0x0c2d0000 0x2000>;
+
+ spkr_left:wsa8810-left{
+ compatible = "sdw10,0217,2010,0";
+ sdw-instance-id = <1>;
+ ...
+ };
+
+ spkr_right:wsa8810-right{
+ compatible = "sdw10,0217,2010,0";
+ sdw-instance-id = <2>;
+ ...
+ };
+};
--
2.21.0
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