linux-kernel - [PATCH v3 1/4] dt-bindings: soundwire: add slave bindings

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Date:   Fri,  9 Aug 2019 14:34:04 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     vkoul@...nel.org, broonie@...nel.org
Cc:     bgoswami@...eaurora.org, plai@...eaurora.org,
        pierre-louis.bossart@...ux.intel.com, robh+dt@...nel.org,
        devicetree@...r.kernel.org, lgirdwood@...il.com,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: [PATCH v3 1/4] dt-bindings: soundwire: add slave bindings

This patch adds bindings for Soundwire Slave devices that includes how
SoundWire enumeration address and Link ID are used to represented in
SoundWire slave device tree nodes.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
 .../devicetree/bindings/soundwire/slave.txt   | 51 +++++++++++++++++++
 1 file changed, 51 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..201f65d2fafa
--- /dev/null
+++ b/Documentation/devicetree/bindings/soundwire/slave.txt
@@ -0,0 +1,51 @@
+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 properties:
+- compatible:	 "sdw<LinkID><VersionID><InstanceID><MFD><PID><CID>".
+		  Is the textual representation of SoundWire Enumeration
+		  address along with Link ID. compatible string should contain
+		  SoundWire Link ID, SoundWire Version ID, Instance ID,
+		  Manufacturer ID, Part ID and Class ID in order
+		  represented as above and shall be in lower-case hexadecimal
+		  with leading zeroes. Vaild sizes of these fields are
+		  LinkID is 1 nibble,
+		  Version ID is 1 nibble
+		  Instance ID in 1 nibble
+		  MFD in 4 nibbles
+		  PID in 4 nibbles
+		  CID is 2 nibbles
+
+		  Version number '0x1' represents SoundWire 1.0
+		  Version number '0x2' represents SoundWire 1.1
+		  ex: "sdw0110217201000" represents 0 LinkID,
+		  SoundWire 1.0 version slave with Instance ID 1.
+		  More Information on detail of encoding of these fields can be
+		  found in MIPI Alliance DisCo & SoundWire 1.0 Specifications.
+
+SoundWire example for Qualcomm's SoundWire controller:
+
+soundwire@...0000 {
+	compatible = "qcom,soundwire-v1.5.0"
+	reg = <0x0c2d0000 0x2000>;
+
+	spkr_left:wsa8810-left{
+		compatible = "sdw0110217201000";
+		...
+	};
+
+	spkr_right:wsa8810-right{
+		compatible = "sdw0120217201000";
+		...
+	};
+};
-- 
2.21.0